CA2035714A1 - Control valve with displacement-compensating seal - Google Patents
Control valve with displacement-compensating sealInfo
- Publication number
- CA2035714A1 CA2035714A1 CA002035714A CA2035714A CA2035714A1 CA 2035714 A1 CA2035714 A1 CA 2035714A1 CA 002035714 A CA002035714 A CA 002035714A CA 2035714 A CA2035714 A CA 2035714A CA 2035714 A1 CA2035714 A1 CA 2035714A1
- Authority
- CA
- Canada
- Prior art keywords
- valve
- outlet
- receiving vessel
- plate
- sealing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/04—Arrangement or mounting of valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L41/00—Branching pipes; Joining pipes to walls
- F16L41/08—Joining pipes to walls or pipes, the joined pipe axis being perpendicular to the plane of the wall or to the axis of another pipe
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0338—Pressure regulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0382—Constructional details of valves, regulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0388—Arrangement of valves, regulators, filters
- F17C2205/0394—Arrangement of valves, regulators, filters in direct contact with the pressure vessel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
- F17C2250/06—Controlling or regulating of parameters as output values
- F17C2250/0605—Parameters
- F17C2250/0626—Pressure
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/6851—With casing, support, protector or static constructional installations
- Y10T137/7036—Jacketed
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
CONTROL VALVE WITH
DISPLACEMENT-COMPENSATING SEAL
XXXXXXXXXXXXXXXXXXXXXXXX
ABSTRACT
An apparatus for controlling the blowdown slurry from a wet oxidation reactor is disclosed. The device includes a pressure control valve with a valve seat and support assembly which extends beyond the valve body to prevent erosion by the blowdown slurry. The apparatus also includes a displacement-compensating seal between the valve and receiving vessel to allow for thermal expansion and contraction during the blowdown cycle while maintaining the integrity of the seal.
DISPLACEMENT-COMPENSATING SEAL
XXXXXXXXXXXXXXXXXXXXXXXX
ABSTRACT
An apparatus for controlling the blowdown slurry from a wet oxidation reactor is disclosed. The device includes a pressure control valve with a valve seat and support assembly which extends beyond the valve body to prevent erosion by the blowdown slurry. The apparatus also includes a displacement-compensating seal between the valve and receiving vessel to allow for thermal expansion and contraction during the blowdown cycle while maintaining the integrity of the seal.
Description
., ~I .
~¦ CONTRO~ VALV~ WI~
! I DIspLA~æ~NT COMP~NSA~I~G SEAL
! :
II BAC~GRO~N~ OF ~8E I~Y~TIO~
!' ield of the ~nvention This invention relates to a control valve with displacement-compensating seal apparatus which is useful for ~5 handling abrasive fluids.
~¦ CONTRO~ VALV~ WI~
! I DIspLA~æ~NT COMP~NSA~I~G SEAL
! :
II BAC~GRO~N~ OF ~8E I~Y~TIO~
!' ield of the ~nvention This invention relates to a control valve with displacement-compensating seal apparatus which is useful for ~5 handling abrasive fluids.
2. Information Disclosure Statement Pressurized seactors have been used at elevated , ~ temperatures in the oxidation of biomass/powdered activated , ; carbon slurry for carbon regeneration, or ~or materials 0 conditioning, such as therm~l conditioning of wastewater si~dges. Tnert solids accumulation in the lower portion of ¦ the reactor necessitates their~ removal for proper system operation. The removal of solid~ during system operation reqUires a controlled, intermittent t~an~fer of an abrasive 5 slurry from a heated~ pres~urized vessel to ambient temperature and pressure con~ition~. A conduit fitted with ;
a pressure~ control ~valve i8 used or this controlled,~
intermittent transfer~ of the Ylurry from the reaotor to a dls~hacge Iwe~v~ing~ ves3el. Th~above described proceso~
0~often~termed~ a~blowdown cycle for ~olid~ removal ro= a wet~
oxidation pressure reactor.
~, ~3 ~
The removal of solids from a wet oxidation reactor through a pressure control valve i5 described by 8auer in U.S. Patent No. 4,139,461 and No. 4,217,218. The hot slurry from the reactor is mixed with cold water prior to 5 traversing the pressure control valve to reduce wear on that valve.
Berrigan et al. in U.S. Patent No. 4,749,492 disclose ¦ removing a blowdown slurry of grit, ash and regenerated powdered activated carbon from a wet oxidation reactor 10 through a valve, then diluting the slurry with water for ¦ subsequent recovery of powdered activated carbon.
A receiving vessel or blowdown pot for collecting a !
slurry from a wet oxidation reactor is disclosed by ~eidl et ~1 al. in U.S. Patent No. 4,620,563. The slurry enters the jll5 blowdown pot from the reactor through a pressure control valve.
Pa9sing a pressurized, hot slurry from a reactor to a receiving vessel res~lts in high velocity, abrasive fluid Itraversing the pressure control valve, as well as the 20 generation of large volumes of water vapor or steam as the I ¦ slurry reaches atmospheric temperature and pres ure. The : I
l pressure control valve is best located close to the receiving vessel to minimize wear on any piping connecting ~the conteol valve and receiving vessel. The receiving 25 ves~el cOnta~iQS liquid water to cushion the slurry transfer and concurrent~ water vaporization. To retain the water vapor~ steam ~and solid~ within the receiving vegsel as the slurry reaches amblen;t conditions, the pressu~e control ~ valve is best securely fastened to the receiving vessel.
~ '~3 3 ~
a pressure~ control ~valve i8 used or this controlled,~
intermittent transfer~ of the Ylurry from the reaotor to a dls~hacge Iwe~v~ing~ ves3el. Th~above described proceso~
0~often~termed~ a~blowdown cycle for ~olid~ removal ro= a wet~
oxidation pressure reactor.
~, ~3 ~
The removal of solids from a wet oxidation reactor through a pressure control valve i5 described by 8auer in U.S. Patent No. 4,139,461 and No. 4,217,218. The hot slurry from the reactor is mixed with cold water prior to 5 traversing the pressure control valve to reduce wear on that valve.
Berrigan et al. in U.S. Patent No. 4,749,492 disclose ¦ removing a blowdown slurry of grit, ash and regenerated powdered activated carbon from a wet oxidation reactor 10 through a valve, then diluting the slurry with water for ¦ subsequent recovery of powdered activated carbon.
A receiving vessel or blowdown pot for collecting a !
slurry from a wet oxidation reactor is disclosed by ~eidl et ~1 al. in U.S. Patent No. 4,620,563. The slurry enters the jll5 blowdown pot from the reactor through a pressure control valve.
Pa9sing a pressurized, hot slurry from a reactor to a receiving vessel res~lts in high velocity, abrasive fluid Itraversing the pressure control valve, as well as the 20 generation of large volumes of water vapor or steam as the I ¦ slurry reaches atmospheric temperature and pres ure. The : I
l pressure control valve is best located close to the receiving vessel to minimize wear on any piping connecting ~the conteol valve and receiving vessel. The receiving 25 ves~el cOnta~iQS liquid water to cushion the slurry transfer and concurrent~ water vaporization. To retain the water vapor~ steam ~and solid~ within the receiving vegsel as the slurry reaches amblen;t conditions, the pressu~e control ~ valve is best securely fastened to the receiving vessel.
~ '~3 3 ~
l The intermittent nature of the operation of this transfer ¦ system results in thermal expansion and contEaction of the piping and valves between the pressurized vessel and the ; receiving vessel. To maintain the integrity of the ¦5 connection between the pressure control valve and the ¦ receiving vessel, and to prevent over~tressing the piping and equipment connections, a so-called expansion loop of piping is placed between the pressurized vessel and the I pressure control valve to compensate for and absorb the 10 thermal expansion of the system. The expansion loop is deqigned with several bends in the piping, resulting in areas where solids from the slurry may collect and obstruct ; the flow through the loop. A direct run of piping would help solve the plugging problem, but this r~duces piping 15 flexibility and increases stress in the piping and equipment connections to beyond acceptable levels due to il thermal expansion.
Further, the pressure control valve must withstand internal pressures up to 7,584 KPa ~1100 psig) and ~; 120 temperatures up to 260C (5000F) as well as high velocity , slurry particles impacting the valve seat. The abrasive i nature of the depressurizing slurry within commonly available pressure oontrol valves result~ in severe erosion j: .
~ I problems, even though the valve seats and plug~ can be made . . ~ ,1 :
25 of erosion-resistant materials such as ceramics. The high , ~ -velocity depressurizing ~lurry generated within the pressure control valve can wear away other non-ceramic portions oE
-; I ' the pressure control valve body, requiring frequent eeplacement of the whole valve unit. ~ I
, ~ - , , .
:: :' ~ i~ 3 ~
To overcome the plugging problem associated with the expansion loop and the erosion problem of the abrasive, high velocity, depressurizing slurry, a new pressure reducing control valve with displacement compensating external seal 5 has been inv~nted.
SUMMARY OP THI~ INVI~NTION
This invention comprises a control valve with displacement-compensating seal. The valve has a unique extended valve seat which relocates the discharge of an ~0 abrasive slu~ry emanating from the valve seat orifice to a position outside the valve body. With the control valve mounted in an opening to a receiving vessel, the rapid I expansion of pressurized gases and liquid vaporization thus ¦ takes place in the receiving vessel rather than in the valve 15 body itself, greatly reducing the internal wear to the valve body by the abrasive slurry coming from the pressurized reactor. With the control valve mounted at the receiving vessel, a disec~ run of piping between the valve and reactor minimizeY the solids plugging problem, but does not ~0 provide the necessary piping flexibility to compensate for thermal expansion.
The displacement-compensating seal between the control valve and the discharge receiving vessel is therefore ¦ ~ ~provided wh-ch allows control valve movement relative to ~5 that vessel caused by thermal expansion and contra~tion o piping and valve between the reactor and receiving vessel .
while maintaining the integrity o~ the seal. The short, direct run of piping which produces the displacement -~
~ ~ -: .
:
3 ~j r3 3 ~I
~S~
prevents solids from plugging the pathway between reactor and receiving vessel during the blowdown cycle.
The valve and seal apparatus comprises a valve body with an inlet and an outlet and a fluid passageway 5 therebetween, said valve body having an opening th~rein on the side opposite said outlet;
a sealing means within said opposite side opening with an aperture therein;
an outlet nozzle member connected to said valve body jl10 outlet, said nozzle member extending into a di.ccharge ¦¦ receiving vessel through an aperture therein, :! a valve seat and support assembly with longitudinal jl aperture therein, said seat and support assembly positioned ,'¦ within said passageway between said inlet and said outlet, IlIS said support assembly extending from said passageway, : through said outlet and beyond the end of said outlet nozzle : member into said discharge receiving vessel;
:. a valve member in said pas ageway between said inlet .
. and said outlet, said valve member movable toward said valve 2Q outle~ for seating against said valve seat for sealing said passageway against ~luid flow therethrough, said valve I member extending through said aperture in the sealing means : within said opening opposite the outlet, and extending i:
j beyond said valve body; and i~
sealing means between said outlet nozzle and said ~ ~: : discharge receiving ve~sel adapted to allow displacement o~
: ~: :: said valve body and nozzle relative to said ~eceiving vessel, while pr~eventing e~cape o ~luid entering said receiving vesseL from said valve.
: ' : ,.' ; ~ ' ' ' 1 1 ~ . : . . .
.
.
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.
The displacement-compensating seal comprises a central plate concentrically sealed (welded) to said outlet nozzle Il member;
m an upper plate above and a lower plate below said 5 concentrically sealed central plat~, said upper and lower ~¦ plates each having an aperture larger than, and concentric ¦ to, said outlet nozzle member allowing movement of said nozzle member and connected central plate within said ¦ -I apertures, said lower plate also sealingly connected j ;10 (welded) to said discharge receiving vessel;
I ' sealing gaskets, a first gasket between said upper plate and said central plate and a second gasket between said lower plate and said central plate, said g~skets allowing movement of said nozzle member and connected 15 central plat~ relative to said upper and lower plates; and ! fastening means between said lower plate and said upper ¦ plate, said fastening mean5 maintaining said upper plate, I first gasket, central plate, second gasket and lower plate i ! in a fluid sealing, displacement-compen5ating relationship.
,.. 1, ~20 BRIEF DESCRIPTION OF THE DRAWING
The Figure is a vertical sectional view of the contLol I ~1 valve and displacement-compensating seal of the invention.
' D~6CRIPTIO~ OF THE P~BF~RR~D EHBODIH~S8 Referring to the Figure, a pressure reducing valve with 25 displacement-compensating exterior ;seal apparatug of ~he i present invention i9 illustrated.~ ~he pressur~ control valve l0 receives the hot, pressuri~ed blowdown slurry ~rom : i' ' :
'i~: : : : . :
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: '' :
: ' . ' ~ :
2 D ~
the reactor through a conduit 12. The control valve is comprised of a valve body 14 with inlet opening 16 and outlet opening 18 and a fluid passageway 20 therebetween.
The valve body also has an opening 22 opposite the valve 5 outlet 18.
The opening 22 has sealing means comprising packing rings 24 and a packing retainer 26. This sealing means has an aperture 28 through which passes the valve member. The valve member is made up of a plug 30 with a ceramic tip 32 Ii 10 which is conical in shape, and a stem 34 whi~h passes ! through the sealing means and allows movement of the valve !~ :
~ member within the fluid passageway 20 as provided by an i outside control means (not shown).
Connected to said valve body outlet 18 is an outlet 5 nozzle member 36 which extends from the outlet la into a discharge receiving vessel 38 through an opening 40 in that vessel. The vessel is also fitted with a vent 42 to the atmosphere to release the gases generated during reac~or blowdown.
~0 Positioned within the passageway 20 is a valve seat 44 made of abrasion-resistant material, such as a ceramic, and a seat support assembly 46 with a longitudinal ap~rture 48 therethrough. ~he seat support assembly is held in position by being threaded into th2 valve body 14 as shown. Further, j 25 the seat support assembly 46, also made from abrasion-resistan~mat~rial, extends ~rom the valve body, through the outlet 18 and beyond the end of the outlet nozzle member 36 into said dischar~e receiving ves~el. Tha depressurizing, abrasive slurry travels ~rom ~he conduit 12 into the :
~: ' ~ ' - , , ' :
- : :
.
:: , :- -Il passageway 20, down through the longitudinal aperture 48 in ¦¦ the seat and support assembly and enters the vessel 38 through a discharge orifice 50 extending within the vessel.
The seat support assembly prevents erosion of the valve 5 body or nozzle from the slurry by apraying the high velocity slurry into the receiving vessel itself. Any wear to the seat or support assembly is easily repaired by removing the worn unit and replacing it with a new unit. The control valve is isolated from the reactor by closing a block valve 10 in the conduit between the control valve and the reactor.
I The repair is accomplished by removing the packing and valve 1, , member from the valve body through the opening 22 and exchanging the valve seat and support assembly through that same opening. Thia prevents costly replacement of the 15 whole pressure control valve. The seat support assembly fits snugly within that portion of pa~sageway 20 and outlet nozzle 36 downstream of the valve seat.
In operation, the pressure control valve is held closed for the majority of the time by moving the valve member into jl20 sealing contact with the valve seat 44 to prevent slur~y I flow through the valve. During the blowdown cycle, the upstream block valve, also closed the majority of the time, opens and allows slurry to flow from the reactor into the conduit 12. The control valve 10 then opens by moving the . i i 25 valve member away from the seat 44, as seen in the ~igure, ¦ allowing the hot, pre~surized slurry to flow into the receiving vessel ~38. The pres5ure control valve generally opens or 30 to 60 seconds during a blowdown cycle which occurs every hour or two of system opera~ion. At the end of I
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that 30 to 6~ seconds of blowdown, the presqure control valve closes by moving the valve member into contact with the seat 44, stopping the slurry flow therethrough. Shortly thereafter, the upstream block valve also closes, isolating 5 the pressure control valve from the reactor. Any conventional valve actuating means can be used to open and close the pressure control valve and block valve.
The use of a direct run of conduit between the reactor and the pressure control valve 10 to prevent plugging by 10 slurry particles reslllts in some displacement of the valve and conduit ~elative to the recaiving ves3el due to thermal jl expansion of the conduit and valve. The displacement-; ll compensating seal thus maintains a secure seal between the ¦ valve and the receiving vessel. The seal comprises a 1, 15 central plate 52 concentrically sealed, such as by welding, I to the outlet nozzle member 36. There are a pl~-rality of holes 54 in the central plate as well. Positioned above and ; below the central plate 52 are upper and lower plate~ 56 and 58 respectively. The lower plate is connected to the 20 receiving ve~sel 38. The~e plates ~56 and 58) each contain I ape~tures 60 larger than, and concentric to, the outlet i nozzle member 36 which allows movement of the nozzle 36 and connected central plate 52 wi~hin said apertures.
:
Further, a fir~t sealing gasket 62 is located between 1 25the ~ipper plate 56 and the central plate 54, while a second sealing gasket 64 io located between the central piate and the lower plate~58. ~Fastening means is p~ovided in the form of threaded studs 66~ which exten~ from the lower plate 58, though the ~ape~tuees 54 in the central plate 52 and through ; ~ : ' ,; ~
:
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the upper plate 56. Threaded nuts 68 hold the plates and ga~kets in a fluid sealing, displacement-compensating relationship.
: The holes 5~ in the central plate are large enough to 5 allow movement of that plate 52 relative to the studs 66 holding the seal in place. Further, an anti-seizer high temperature lubricant, such as Rockwell No. 921 valve lubricant, may be applied to the gaskets to allow easier movement o the central plate 52 within the seal assembly lO while preventing escape of gases, steam, water vapor and slurry particles from th~ receiving vessel during the blowdown cycle from the reactor.
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Further, the pressure control valve must withstand internal pressures up to 7,584 KPa ~1100 psig) and ~; 120 temperatures up to 260C (5000F) as well as high velocity , slurry particles impacting the valve seat. The abrasive i nature of the depressurizing slurry within commonly available pressure oontrol valves result~ in severe erosion j: .
~ I problems, even though the valve seats and plug~ can be made . . ~ ,1 :
25 of erosion-resistant materials such as ceramics. The high , ~ -velocity depressurizing ~lurry generated within the pressure control valve can wear away other non-ceramic portions oE
-; I ' the pressure control valve body, requiring frequent eeplacement of the whole valve unit. ~ I
, ~ - , , .
:: :' ~ i~ 3 ~
To overcome the plugging problem associated with the expansion loop and the erosion problem of the abrasive, high velocity, depressurizing slurry, a new pressure reducing control valve with displacement compensating external seal 5 has been inv~nted.
SUMMARY OP THI~ INVI~NTION
This invention comprises a control valve with displacement-compensating seal. The valve has a unique extended valve seat which relocates the discharge of an ~0 abrasive slu~ry emanating from the valve seat orifice to a position outside the valve body. With the control valve mounted in an opening to a receiving vessel, the rapid I expansion of pressurized gases and liquid vaporization thus ¦ takes place in the receiving vessel rather than in the valve 15 body itself, greatly reducing the internal wear to the valve body by the abrasive slurry coming from the pressurized reactor. With the control valve mounted at the receiving vessel, a disec~ run of piping between the valve and reactor minimizeY the solids plugging problem, but does not ~0 provide the necessary piping flexibility to compensate for thermal expansion.
The displacement-compensating seal between the control valve and the discharge receiving vessel is therefore ¦ ~ ~provided wh-ch allows control valve movement relative to ~5 that vessel caused by thermal expansion and contra~tion o piping and valve between the reactor and receiving vessel .
while maintaining the integrity o~ the seal. The short, direct run of piping which produces the displacement -~
~ ~ -: .
:
3 ~j r3 3 ~I
~S~
prevents solids from plugging the pathway between reactor and receiving vessel during the blowdown cycle.
The valve and seal apparatus comprises a valve body with an inlet and an outlet and a fluid passageway 5 therebetween, said valve body having an opening th~rein on the side opposite said outlet;
a sealing means within said opposite side opening with an aperture therein;
an outlet nozzle member connected to said valve body jl10 outlet, said nozzle member extending into a di.ccharge ¦¦ receiving vessel through an aperture therein, :! a valve seat and support assembly with longitudinal jl aperture therein, said seat and support assembly positioned ,'¦ within said passageway between said inlet and said outlet, IlIS said support assembly extending from said passageway, : through said outlet and beyond the end of said outlet nozzle : member into said discharge receiving vessel;
:. a valve member in said pas ageway between said inlet .
. and said outlet, said valve member movable toward said valve 2Q outle~ for seating against said valve seat for sealing said passageway against ~luid flow therethrough, said valve I member extending through said aperture in the sealing means : within said opening opposite the outlet, and extending i:
j beyond said valve body; and i~
sealing means between said outlet nozzle and said ~ ~: : discharge receiving ve~sel adapted to allow displacement o~
: ~: :: said valve body and nozzle relative to said ~eceiving vessel, while pr~eventing e~cape o ~luid entering said receiving vesseL from said valve.
: ' : ,.' ; ~ ' ' ' 1 1 ~ . : . . .
.
.
~: : .: . -.
:: ' . . : , ~' .
.
The displacement-compensating seal comprises a central plate concentrically sealed (welded) to said outlet nozzle Il member;
m an upper plate above and a lower plate below said 5 concentrically sealed central plat~, said upper and lower ~¦ plates each having an aperture larger than, and concentric ¦ to, said outlet nozzle member allowing movement of said nozzle member and connected central plate within said ¦ -I apertures, said lower plate also sealingly connected j ;10 (welded) to said discharge receiving vessel;
I ' sealing gaskets, a first gasket between said upper plate and said central plate and a second gasket between said lower plate and said central plate, said g~skets allowing movement of said nozzle member and connected 15 central plat~ relative to said upper and lower plates; and ! fastening means between said lower plate and said upper ¦ plate, said fastening mean5 maintaining said upper plate, I first gasket, central plate, second gasket and lower plate i ! in a fluid sealing, displacement-compen5ating relationship.
,.. 1, ~20 BRIEF DESCRIPTION OF THE DRAWING
The Figure is a vertical sectional view of the contLol I ~1 valve and displacement-compensating seal of the invention.
' D~6CRIPTIO~ OF THE P~BF~RR~D EHBODIH~S8 Referring to the Figure, a pressure reducing valve with 25 displacement-compensating exterior ;seal apparatug of ~he i present invention i9 illustrated.~ ~he pressur~ control valve l0 receives the hot, pressuri~ed blowdown slurry ~rom : i' ' :
'i~: : : : . :
~ . ~
' ~ ' :'i ~ , `
: '' :
: ' . ' ~ :
2 D ~
the reactor through a conduit 12. The control valve is comprised of a valve body 14 with inlet opening 16 and outlet opening 18 and a fluid passageway 20 therebetween.
The valve body also has an opening 22 opposite the valve 5 outlet 18.
The opening 22 has sealing means comprising packing rings 24 and a packing retainer 26. This sealing means has an aperture 28 through which passes the valve member. The valve member is made up of a plug 30 with a ceramic tip 32 Ii 10 which is conical in shape, and a stem 34 whi~h passes ! through the sealing means and allows movement of the valve !~ :
~ member within the fluid passageway 20 as provided by an i outside control means (not shown).
Connected to said valve body outlet 18 is an outlet 5 nozzle member 36 which extends from the outlet la into a discharge receiving vessel 38 through an opening 40 in that vessel. The vessel is also fitted with a vent 42 to the atmosphere to release the gases generated during reac~or blowdown.
~0 Positioned within the passageway 20 is a valve seat 44 made of abrasion-resistant material, such as a ceramic, and a seat support assembly 46 with a longitudinal ap~rture 48 therethrough. ~he seat support assembly is held in position by being threaded into th2 valve body 14 as shown. Further, j 25 the seat support assembly 46, also made from abrasion-resistan~mat~rial, extends ~rom the valve body, through the outlet 18 and beyond the end of the outlet nozzle member 36 into said dischar~e receiving ves~el. Tha depressurizing, abrasive slurry travels ~rom ~he conduit 12 into the :
~: ' ~ ' - , , ' :
- : :
.
:: , :- -Il passageway 20, down through the longitudinal aperture 48 in ¦¦ the seat and support assembly and enters the vessel 38 through a discharge orifice 50 extending within the vessel.
The seat support assembly prevents erosion of the valve 5 body or nozzle from the slurry by apraying the high velocity slurry into the receiving vessel itself. Any wear to the seat or support assembly is easily repaired by removing the worn unit and replacing it with a new unit. The control valve is isolated from the reactor by closing a block valve 10 in the conduit between the control valve and the reactor.
I The repair is accomplished by removing the packing and valve 1, , member from the valve body through the opening 22 and exchanging the valve seat and support assembly through that same opening. Thia prevents costly replacement of the 15 whole pressure control valve. The seat support assembly fits snugly within that portion of pa~sageway 20 and outlet nozzle 36 downstream of the valve seat.
In operation, the pressure control valve is held closed for the majority of the time by moving the valve member into jl20 sealing contact with the valve seat 44 to prevent slur~y I flow through the valve. During the blowdown cycle, the upstream block valve, also closed the majority of the time, opens and allows slurry to flow from the reactor into the conduit 12. The control valve 10 then opens by moving the . i i 25 valve member away from the seat 44, as seen in the ~igure, ¦ allowing the hot, pre~surized slurry to flow into the receiving vessel ~38. The pres5ure control valve generally opens or 30 to 60 seconds during a blowdown cycle which occurs every hour or two of system opera~ion. At the end of I
~ !
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' .
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that 30 to 6~ seconds of blowdown, the presqure control valve closes by moving the valve member into contact with the seat 44, stopping the slurry flow therethrough. Shortly thereafter, the upstream block valve also closes, isolating 5 the pressure control valve from the reactor. Any conventional valve actuating means can be used to open and close the pressure control valve and block valve.
The use of a direct run of conduit between the reactor and the pressure control valve 10 to prevent plugging by 10 slurry particles reslllts in some displacement of the valve and conduit ~elative to the recaiving ves3el due to thermal jl expansion of the conduit and valve. The displacement-; ll compensating seal thus maintains a secure seal between the ¦ valve and the receiving vessel. The seal comprises a 1, 15 central plate 52 concentrically sealed, such as by welding, I to the outlet nozzle member 36. There are a pl~-rality of holes 54 in the central plate as well. Positioned above and ; below the central plate 52 are upper and lower plate~ 56 and 58 respectively. The lower plate is connected to the 20 receiving ve~sel 38. The~e plates ~56 and 58) each contain I ape~tures 60 larger than, and concentric to, the outlet i nozzle member 36 which allows movement of the nozzle 36 and connected central plate 52 wi~hin said apertures.
:
Further, a fir~t sealing gasket 62 is located between 1 25the ~ipper plate 56 and the central plate 54, while a second sealing gasket 64 io located between the central piate and the lower plate~58. ~Fastening means is p~ovided in the form of threaded studs 66~ which exten~ from the lower plate 58, though the ~ape~tuees 54 in the central plate 52 and through ; ~ : ' ,; ~
:
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:: - . : -'' ' :: ' :: : ' : : :
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the upper plate 56. Threaded nuts 68 hold the plates and ga~kets in a fluid sealing, displacement-compensating relationship.
: The holes 5~ in the central plate are large enough to 5 allow movement of that plate 52 relative to the studs 66 holding the seal in place. Further, an anti-seizer high temperature lubricant, such as Rockwell No. 921 valve lubricant, may be applied to the gaskets to allow easier movement o the central plate 52 within the seal assembly lO while preventing escape of gases, steam, water vapor and slurry particles from th~ receiving vessel during the blowdown cycle from the reactor.
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Claims (7)
1. A pressure reducing control valve with displacement-compensating exterior seal, said valve and seal apparatus comprising;
a valve body with an inlet and an outlet and a fluid passageway therebetween, said valve body having an opening therein on the side opposite said outlet;
a sealing means within said opposite side opening with an aperture therein;
an outlet nozzle member connected to said valve body outlet, said nozzle member extending into a discharge receiving vessel through an aperture therein;
a valve seat and support assembly with longitudinal aperture therein, said seat and support assembly positioned within said passageway between said inlet and said outlet, said support assembly extending from said passageway, through said outlet and beyond the end of said outlet nozzle member into said discharge receiving vessel;
a valve member in said passageway between said inlet and said outlet, said valve member movable toward said valve outlet for seating against said valve seat for sealing said passageway against fluid flow therethrough, said valve member extending through said aperture in the sealing means within said opening opposite the outlet, and extending beyond said valve body; and sealing means between said outlet nozzle and said discharge receiving vessel adapted to allow displacement of said valve body and nozzle relative to said receiving vessel, while preventing escape of fluid entering said receiving vessel from said valve.
a valve body with an inlet and an outlet and a fluid passageway therebetween, said valve body having an opening therein on the side opposite said outlet;
a sealing means within said opposite side opening with an aperture therein;
an outlet nozzle member connected to said valve body outlet, said nozzle member extending into a discharge receiving vessel through an aperture therein;
a valve seat and support assembly with longitudinal aperture therein, said seat and support assembly positioned within said passageway between said inlet and said outlet, said support assembly extending from said passageway, through said outlet and beyond the end of said outlet nozzle member into said discharge receiving vessel;
a valve member in said passageway between said inlet and said outlet, said valve member movable toward said valve outlet for seating against said valve seat for sealing said passageway against fluid flow therethrough, said valve member extending through said aperture in the sealing means within said opening opposite the outlet, and extending beyond said valve body; and sealing means between said outlet nozzle and said discharge receiving vessel adapted to allow displacement of said valve body and nozzle relative to said receiving vessel, while preventing escape of fluid entering said receiving vessel from said valve.
2. A valve and seal apparatus according to claim 1, wherein said sealing means between said outlet nozzle and said discharge receiving vessel comprises;
a central plate concentrically sealed to said outlet nozzle member;
an upper plate above and a lower plate below said concentrically sealed central plate, said upper and lower plates each having an aperture larger than, and concentric to, said outlet nozzle member allowing movement of said nozzle member and connected central plate within said apertures, said lower plate also sealingly connected to said discharge receiving vessel;
sealing gaskets, a first gasket between said upper plate and said central plate and a second gasket between said lower plate and said central plate, said gaskets allowing movement of said nozzle member and connected central plate relative to said upper and lower plates; and fastening means between said lower plate and said upper plate, said fastening means maintaining said upper plate, first gasket, central plate, second gasket and lower plate in a fluid sealing, displacement-compensating relationship.
a central plate concentrically sealed to said outlet nozzle member;
an upper plate above and a lower plate below said concentrically sealed central plate, said upper and lower plates each having an aperture larger than, and concentric to, said outlet nozzle member allowing movement of said nozzle member and connected central plate within said apertures, said lower plate also sealingly connected to said discharge receiving vessel;
sealing gaskets, a first gasket between said upper plate and said central plate and a second gasket between said lower plate and said central plate, said gaskets allowing movement of said nozzle member and connected central plate relative to said upper and lower plates; and fastening means between said lower plate and said upper plate, said fastening means maintaining said upper plate, first gasket, central plate, second gasket and lower plate in a fluid sealing, displacement-compensating relationship.
3. A valve and seal apparatus according to claim 2, wherein said concentrically sealed central plate contains a plurality of apertures therein; and said fastening means comprises a like plurality of threaded studs extending from said lower plate, through said apertures in said central plate and connected to said upper plate to maintain a seal between said central plate and outlet nozzle and said discharge receiving vessel.
4. A valve and seal apparatus according to claim 1, wherein said valve seat and support assembly are made of abrasion-resistant material.
5. A valve and seal apparatus according to claim 1, wherein said valve member comprises a plug fitted for sealing against said valve seat, and a stem connected to said plug, said stem extending through the aperture in the sealing means within said opening opposite said valve body outlet.
6. A valve and seal apparatus according to claim 5, wherein said plug has a conical tip of abrasion-resistant material fitted for sealing against said valve seat.
7. A valve and seal apparatus according to claim 1, wherein said sealing means within the opposite side opening comprises a plurality of packing rings and a packing retainer for sealing said opposite side opening against fluid flow therethrough.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/475,586 US5011114A (en) | 1990-02-05 | 1990-02-05 | Control valve with displacement-compensating seal |
| US475,586 | 1990-02-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2035714A1 true CA2035714A1 (en) | 1991-08-06 |
Family
ID=23888248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002035714A Abandoned CA2035714A1 (en) | 1990-02-05 | 1991-02-05 | Control valve with displacement-compensating seal |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5011114A (en) |
| EP (1) | EP0441066A1 (en) |
| JP (1) | JPH04213710A (en) |
| CA (1) | CA2035714A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5389264A (en) * | 1993-07-12 | 1995-02-14 | Zimpro Environmental Inc. | Hydraulic energy dissipator for wet oxidation process |
| EP1592593B1 (en) * | 2003-02-05 | 2007-08-08 | Continental Teves AG & Co. oHG | Solenoid valve |
| CN100451441C (en) * | 2007-08-20 | 2009-01-14 | 吴广福 | Air pressure fuel-feed system of resin sand |
| US20160223087A1 (en) * | 2015-02-03 | 2016-08-04 | Sustainable Waste Power Systems, Inc. | Control valve system for controlling fluid flow |
| JP2022007129A (en) * | 2020-06-25 | 2022-01-13 | 川崎重工業株式会社 | Casing for gas and tank valve device |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR403633A (en) * | 1909-06-03 | 1909-11-10 | Gottfried Helbling | Tap |
| FR636123A (en) * | 1926-06-21 | 1928-04-02 | Tap | |
| US2694583A (en) * | 1949-08-04 | 1954-11-16 | Glenn L Martin Co | Laterally and angularly adjustable manifold mounting |
| DE1425730A1 (en) * | 1963-06-20 | 1968-12-12 | Zikesch Dipl Ing Herbert | Drain valve |
| US3432187A (en) * | 1967-05-23 | 1969-03-11 | Mooney Brothers Corp | Tube coupling |
| US4620563A (en) * | 1975-02-24 | 1986-11-04 | Zimpro Inc. | Blowdown pot for a reactor |
| US4128109A (en) * | 1975-12-30 | 1978-12-05 | Hydrocarbon Research, Inc. | Pressure let-down valve assembly for handling abrasive liquids |
| US4217218A (en) * | 1977-12-27 | 1980-08-12 | Sterling Durg Inc. | Removal of solids from a wet oxidation reactor |
| US4139461A (en) * | 1977-12-27 | 1979-02-13 | Sterling Drug Inc. | Removal of solids from a wet oxidation reactor |
| US4413646A (en) * | 1981-05-01 | 1983-11-08 | Exxon Research And Engineering Co. | Streamline coal slurry letdown valve |
| US4437686A (en) * | 1981-08-03 | 1984-03-20 | Fluid Operations & Equipment, Inc. | Adjustable and repairable flow diverter for food processing equipment |
| US4492392A (en) * | 1983-01-19 | 1985-01-08 | Poly Processing Company, Inc. | Tank fitting |
| US4593940A (en) * | 1983-04-29 | 1986-06-10 | Wilder Don R | Flange assembly for hydraulic power systems |
| US4749492A (en) * | 1987-07-06 | 1988-06-07 | Zimpro/Passavant | Process for recovering regenerated adsorbent particles and separating ash therefrom |
-
1990
- 1990-02-05 US US07/475,586 patent/US5011114A/en not_active Expired - Fee Related
- 1990-12-28 EP EP90314417A patent/EP0441066A1/en not_active Ceased
-
1991
- 1991-02-05 CA CA002035714A patent/CA2035714A1/en not_active Abandoned
- 1991-02-05 JP JP3014196A patent/JPH04213710A/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04213710A (en) | 1992-08-04 |
| EP0441066A1 (en) | 1991-08-14 |
| US5011114A (en) | 1991-04-30 |
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Legal Events
| Date | Code | Title | Description |
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| FZDE | Dead |