CN103148230A - Automatic pressure release structure for double disk parallel gate valve - Google Patents
Automatic pressure release structure for double disk parallel gate valve Download PDFInfo
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- CN103148230A CN103148230A CN2013100829157A CN201310082915A CN103148230A CN 103148230 A CN103148230 A CN 103148230A CN 2013100829157 A CN2013100829157 A CN 2013100829157A CN 201310082915 A CN201310082915 A CN 201310082915A CN 103148230 A CN103148230 A CN 103148230A
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- valve
- flashboard
- valve body
- escape orifice
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Abstract
The invention discloses an automatic pressure release structure for a double disk parallel gate valve, which comprises a valve body, two valve seat and, two gates, wherein the valve seats are embedded into the valve body and welded with the valve body into a whole; the valve body is internally provided with the gates which can be clung with or separated from the valve seats by the action of a driving force of an actuating mechanism; the two gates are placed in parallel and oppositely; a front valve cavity and a rear valve cavity are arranged on the outer sides of the two gates respectively; an inner cavity sealed by the two gates, the valve body and the valve seats is a valve cavity; and release holes penetrating front and back are formed in the two gates and internally provided with automatic pressure release devices capable of automatically releasing excess pressure in the valve cavity. The structure effectively solves the problem that the valve cannot be opened and even is damaged due to a pressure rise in the inner cavity of the valve. The service life of the valve is prolonged.
Description
[technical field]
The present invention relates to the parallel double-flashboard gate valve technical field, be specially adapted to industrial automatic control medium difference variation occasion parallel double-flashboard gate valve large or that extraneous difference variation is large and can realize self-relieving technical field.
[background technique]
Parallel double-flashboard gate valve has good seal performance, opens and closes the characteristics such as moment is little, long service life due to the particularity of its structure, more and more is applied in the industries such as oil, chemical industry, Coal Chemical Industry, light industry.
Parallel double-flashboard gate valve valve rod thrust is conducted to flashboard by valve inner components component, and flashboard and valve base chamber are pushed automatically, forms forced seal.The sealing configuration of existing parallel double-flashboard gate valve is consulted Fig. 1, and large or ambient temperature changes greatly in particular cases this structure in some medium difference variation, after valve is closed when temperature is low, may need could open after a few hours.Owing to there being medium in valve pocket, raise or the external temperature rising as pipeline internal medium temperature in the valve closing process, this moment is because valve is in sealing state, in valve pocket, volumetric expansion can occur along with temperature raises in medium, cause the valve pocket internal pressure extremely to raise, make flashboard and valve base sealing specific pressure excessive.Need larger driving force this moment, could Open valve.Tend in this case cause valve to open, even damage valve sealing face or valve body.
[summary of the invention]
Purpose of the present invention solves the problems of the prior art exactly, a kind of parallel double-flashboard gate valve releasing pressure automatically structure is proposed, can reliable sealing, the occasion that the medium difference variation is large or extraneous difference variation is large can releasing pressure automatically, guarantee that valve sealing face and valve body are intact, extend the working life of parallel double-flashboard gate valve.
for achieving the above object, the present invention proposes a kind of parallel double-flashboard gate valve releasing pressure automatically structure, comprise valve body, two valve seats, two flashboards, described valve seat is set in valve body, and be welded as a whole with valve body, the flashboard that can be close to or separate with valve seat under actuator's driving force effect is installed in valve body, two flashboards are parallel staggered relatively, the outside of two flashboards is respectively the valve ante-chamber, the valve back cavity, inner chamber after two flashboards and valve body and valve base sealing is valve pocket, the escape orifice that connects before and after all having on described two flashboards, the automatic decompression device of the inner unnecessary pressure of valve pocket of can automatically releasing is installed in described escape orifice.
As preferably, described automatic decompression device adopts the pressure adjustable automatic decompression device, can adjust according to actual needs automatic decompression device to suitable pressure.
As preferably, described pressure adjustable automatic decompression device comprises sealed steel ball, cylindrical spring, the first Cock screw, the second Cock screw, one end of described cylindrical spring is provided with sealed steel ball, the other end of cylindrical spring is provided with the first Cock screw and the second Cock screw, simple in structure, sealing, pressure release is effective.
As preferably, described pressure adjustable automatic decompression device also comprises locating washer, described locating washer is the hollow circuit cylinder body structure that is provided with positioning hole and some openings, locating washer is arranged between sealed steel ball and cylindrical spring by positioning hole, be provided with vertically some openings on the outer circumferential face of locating washer, be convenient to the pressure discharging.
As preferably, the quantity of described locating washer upper shed is 3～8, and all openings evenly distribute along the outer circumferential face of locating washer,, be convenient to the pressure discharging.
As preferably, described escape orifice is 3 stops reducing hole, the aperture of leading portion is less than the aperture in stage casing, the aperture in stage casing is less than the tapped bore of back segment, described sealed steel ball, locating washer, cylindrical spring are arranged in the stage casing of escape orifice, the first Cock screw, the second Cock screw are arranged in the tapped hole of escape orifice back segment, and be easy for installation.
As preferably, form the escape orifice sealing surface between the leading portion of described escape orifice and stage casing, described escape orifice sealing surface weld deposit has hard alloy layer, has improved working life.
As preferably, described escape orifice is opened in the central position of flashboard.
for achieving the above object, the invention allows for the unidirectional releasing pressure automatically structure of a kind of parallel double-flashboard gate valve, comprise valve body, two valve seats, two flashboards, described valve seat is set in valve body, and be welded as a whole with valve body, the flashboard that can be close to or separate with valve seat under external force is installed in valve body, two flashboards are parallel staggered relatively, the outside of two flashboards is respectively the valve ante-chamber, the valve back cavity, inner chamber after two flashboards and valve body and valve base sealing is valve pocket, the escape orifice that connects before and after having on the flashboard at described rear portion, the automatic decompression device of the inner unnecessary pressure of valve pocket of can automatically releasing is installed in described escape orifice.
Beneficial effect of the present invention: the present invention is by arranging escape orifice on the flashboard of left and right (or claim before and after), and by automatic decompression device is set in escape orifice.After valve closing, the pressure that medium temperature influence in valve pocket can be raise is released automatically by escape orifice.Thereby make the valve pocket internal pressure maintain under certain situation, efficiently solve the phenomenon that valve cavity pressure raises and causes valve not open and even destroy, increased the working life of valve.
Feature of the present invention and advantage will be elaborated by reference to the accompanying drawings by embodiment.
[description of drawings]
Fig. 1 is the sealed structural representation of parallel double-flashboard gate valve in prior art;
Fig. 2 is parallel double-flashboard gate valve releasing pressure automatically structure embodiment's one of the present invention structural representation;
Fig. 3 is parallel double-flashboard gate valve releasing pressure automatically structure embodiment's two of the present invention structural representation;
Fig. 4 is the structural representation of flashboard in parallel double-flashboard gate valve releasing pressure automatically structure of the present invention;
Fig. 5 is the structural representation that in parallel double-flashboard gate valve releasing pressure automatically structure of the present invention, flashboard is installed automatic decompression device;
Fig. 6 is the longitudinal sectional view of locating washer in parallel double-flashboard gate valve releasing pressure automatically structure of the present invention;
Fig. 7 is the transverse sectional view of locating washer in parallel double-flashboard gate valve releasing pressure automatically structure of the present invention;
Fig. 8 is the sealing principle figure of parallel double-flashboard gate valve releasing pressure automatically structure of the present invention;
Fig. 9 is the pressure release schematic diagram of parallel double-flashboard gate valve releasing pressure automatically structure of the present invention.
In figure: 1-flashboard, 2-valve seat, 3-valve body, 4-automatic decompression device, 5-escape orifice sealing surface, 6-escape orifice, 7-the first Cock screw, 8-the second Cock screw, 9-sealed steel ball, 10-locating washer, 11-cylindrical spring, 12-opening.
[embodiment]
Embodiment one:
consult Fig. 2, the unidirectional releasing pressure automatically structure of parallel double-flashboard gate valve, comprise valve body, two valve seats, two flashboards, described valve seat is set in valve body, and be welded as a whole with valve body, the flashboard that can be close to or separate with valve seat under actuator's driving force effect is installed in valve body, two flashboards are parallel staggered relatively, the outside of two flashboards is respectively the valve ante-chamber, the valve back cavity, inner chamber after two flashboards and valve body and valve base sealing is valve pocket, the escape orifice that connects before and after having on the flashboard at described rear portion, the automatic decompression device of the inner unnecessary pressure of valve pocket of can automatically releasing is installed in described escape orifice, described automatic decompression device adopts the pressure adjustable automatic decompression device.
In the present embodiment, only be provided with automatic decompression device on a flashboard, the structure of another flashboard is not changed, and has reduced like this processing cost, but this structure can only realize unidirectional pressure release, need to valve body subscript free flow to, prevent that operator are anti-loaded.
Embodiment two:
consult Fig. 3, parallel double-flashboard gate valve releasing pressure automatically structure, comprise valve body, two valve seats, two flashboards, described valve seat is set in valve body, and be welded as a whole with valve body, the flashboard that can be close to or separate with valve seat under actuator's driving force effect is installed in valve body, two flashboards are parallel staggered relatively, the outside of two flashboards is respectively the valve ante-chamber, the valve back cavity, inner chamber after two flashboards and valve body and valve base sealing is valve pocket, the escape orifice that connects before and after all having on described two flashboards, the automatic decompression device of the inner unnecessary pressure of valve pocket of can automatically releasing is installed in described escape orifice, described automatic decompression device adopts the pressure adjustable automatic decompression device.
In the present embodiment, be equipped with automatic decompression device on two flashboards, be Bidirectional seal structure, without flowing to requirement, fitting operation is more convenient when mounted for such structure valve, also not need to valve body subscript free flow to.
Consult Fig. 4, escape orifice is opened in the central position of flashboard, described escape orifice is 3 stops reducing hole, the aperture of leading portion is less than the aperture in stage casing, the aperture in stage casing is less than the tapped bore of back segment, form the escape orifice sealing surface between the leading portion of escape orifice and stage casing, described escape orifice sealing surface weld deposit has hard alloy layer.
Consult Fig. 5, described pressure adjustable automatic decompression device comprises sealed steel ball, locating washer, cylindrical spring, the first Cock screw, the second Cock screw, one end of described cylindrical spring is provided with sealed steel ball, the other end of cylindrical spring is provided with the first Cock screw and the second Cock screw, and locating washer is arranged between sealed steel ball and cylindrical spring by positioning hole.Described sealed steel ball, locating washer, cylindrical spring are arranged in the stage casing of escape orifice, and the first Cock screw, the second Cock screw are arranged in the back segment tapped hole of escape orifice.Described sealed steel ball is placed in the escape orifice sealing station, locates by locating washer, and provides pretightening force that sealed steel ball and flashboard escape orifice are sealed by cylindrical spring; The pretightening force of described cylindrical spring is adjusted by the second Cock screw, after pretightening force is adjusted, more fixing by the first Cock screw 5.
Consult Fig. 6,7, described locating washer is provided with positioning hole, and is provided with at its cylindrical the opening of dividing equally, so that the pressure discharging; Locating washer is arranged between sealed steel ball and cylindrical spring by positioning hole, is provided with vertically some openings on the outer circumferential face of locating washer.The quantity of described locating washer upper shed is 3～8, and all openings evenly distribute along the outer circumferential face of locating washer, has adopted the structure of 4 best openings in the present embodiment.
Consult Fig. 2,3, after valve closing, described flashboard and valve seat make valve seal, and while and valve body form cavity--the valve pocket of a sealing.If valve pipeline medium temperature in closing process raises or external temperature raises, in valve pocket, volumetric expansion can occur in medium thereupon, makes that in valve pocket, pressure medium P3 can be higher than upstream pressure P1 and downstream pressure P2.When pressure P 3 during higher than the setting value of automatic decompression device, valve insertion pressure P 3 can be released a part of pressure after valve by automatic decompression device, make valve insertion pressure P 3 maintain all the time in certain value, prevent effectively that internal pressure P3 is too high and cause actuator stem force to be difficult to valve opening, even can damage the phenomenon of valve.
Consult Fig. 8 and Fig. 9, the sealing force of described sealed steel ball is the power that after the power F that provided by cylindrical spring and valve, pressure medium P2 provides, and when the required sealing force of active force+sealed steel ball of active force≤F+P2 of P3, just realizes the sealing of automatic decompression device.When the required sealing force of active force+sealed steel ball of active force＞F+P2 of P3, the active force of P3 just can promote the sealed steel ball motion, and the compression cylindrical spring is realized releasing pressure automatically, until equilibrium of forces.After valve pocket internal pressure P3 releases setting value, can automatically realize the sealing of valve again by the active force of cylindrical spring and the active force of downstream pressure P2.Effectively improved the working life of valve.
Above-described embodiment is to explanation of the present invention, is not limitation of the invention, any scheme after simple transformation of the present invention is all belonged to protection scope of the present invention.
Claims (9)
1. parallel double-flashboard gate valve releasing pressure automatically structure, comprise valve body, two valve seats, two flashboards, described valve seat is set in valve body, and be welded as a whole with valve body, the flashboard that can be close to or separate with valve seat under actuator's driving force effect is installed in valve body, two flashboards are parallel staggered relatively, the outside of two flashboards is respectively the valve ante-chamber, the valve back cavity, inner chamber after two flashboards and valve body and valve base sealing is valve pocket, it is characterized in that: the escape orifice that connects before and after all having on described two flashboards, the automatic decompression device of the inner unnecessary pressure of valve pocket of can automatically releasing is installed in described escape orifice.
2. parallel double-flashboard gate valve releasing pressure automatically structure as claimed in claim 1, is characterized in that: described automatic decompression device employing pressure adjustable automatic decompression device.
3. parallel double-flashboard gate valve releasing pressure automatically structure as claimed in claim 2, it is characterized in that: described pressure adjustable automatic decompression device comprises sealed steel ball, cylindrical spring, the first Cock screw, the second Cock screw, one end of described cylindrical spring is provided with sealed steel ball, and the other end of cylindrical spring is provided with the first Cock screw and the second Cock screw.
4. parallel double-flashboard gate valve releasing pressure automatically structure as claimed in claim 3, it is characterized in that: described pressure adjustable automatic decompression device also comprises locating washer, described locating washer is the hollow circuit cylinder body structure that is provided with positioning hole and some openings, locating washer is arranged between sealed steel ball and cylindrical spring by positioning hole, is provided with vertically some openings on the outer circumferential face of locating washer.
5. parallel double-flashboard gate valve releasing pressure automatically structure as claimed in claim 4, it is characterized in that: the quantity of described locating washer upper shed is 3～8, and all openings evenly distribute along the outer circumferential face of locating washer.
6. parallel double-flashboard gate valve releasing pressure automatically structure as claimed in claim 5, it is characterized in that: described escape orifice is 3 stops reducing hole, the aperture of leading portion is less than the aperture in stage casing, the aperture in stage casing is less than the tapped bore of back segment, described sealed steel ball, locating washer, cylindrical spring are arranged in the stage casing of escape orifice, and the first Cock screw, the second Cock screw are arranged in the tapped hole of back segment of escape orifice.
7. parallel double-flashboard gate valve releasing pressure automatically structure as claimed in claim 6 is characterized in that: form the escape orifice sealing surface between the leading portion of described escape orifice and stage casing, described escape orifice sealing surface weld deposit has hard alloy layer.
8. parallel double-flashboard gate valve releasing pressure automatically structure as described in claim 1～7, it is characterized in that: described escape orifice is opened in the central position of flashboard.
9. the unidirectional releasing pressure automatically structure of parallel double-flashboard gate valve, comprise valve body, two valve seats, two flashboards, described valve seat is set in valve body, and be welded as a whole with valve body, the flashboard that can be close to or separate with valve seat under external force is installed in valve body, two flashboards are parallel staggered relatively, the outside of two flashboards is respectively the valve ante-chamber, the valve back cavity, inner chamber after two flashboards and valve body and valve base sealing is valve pocket, it is characterized in that: the escape orifice that connects before and after having on the flashboard at described rear portion, the automatic decompression device of the inner unnecessary pressure of valve pocket of can automatically releasing is installed in described escape orifice.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100829157A CN103148230A (en) | 2013-03-15 | 2013-03-15 | Automatic pressure release structure for double disk parallel gate valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100829157A CN103148230A (en) | 2013-03-15 | 2013-03-15 | Automatic pressure release structure for double disk parallel gate valve |
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| Publication Number | Publication Date |
|---|---|
| CN103148230A true CN103148230A (en) | 2013-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013100829157A Pending CN103148230A (en) | 2013-03-15 | 2013-03-15 | Automatic pressure release structure for double disk parallel gate valve |
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| Country | Link |
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| CN (1) | CN103148230A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103410997A (en) * | 2013-08-26 | 2013-11-27 | 南通国电电站阀门有限公司 | High-pressure-relief type parallel-double-gate single side hard sealing gate valve |
| CN104534114A (en) * | 2015-01-26 | 2015-04-22 | 浙江德卡控制阀仪表有限公司 | Pilot bidirectional double-disc high-pressure gate valve |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2077064U (en) * | 1990-07-21 | 1991-05-15 | 温州市防爆电器元件厂 | Fast shearing-off sluice valve |
| JP2008169954A (en) * | 2007-01-12 | 2008-07-24 | Kitamura Valve Seizo Kk | Ball valve |
| CN201526691U (en) * | 2009-06-23 | 2010-07-14 | 汪玉奎 | Self-relief gate valve |
| CN201836479U (en) * | 2010-08-26 | 2011-05-18 | 京东大型阀门有限公司 | Safety relief device of metal two-way sealing valve cavity |
-
2013
- 2013-03-15 CN CN2013100829157A patent/CN103148230A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2077064U (en) * | 1990-07-21 | 1991-05-15 | 温州市防爆电器元件厂 | Fast shearing-off sluice valve |
| JP2008169954A (en) * | 2007-01-12 | 2008-07-24 | Kitamura Valve Seizo Kk | Ball valve |
| CN201526691U (en) * | 2009-06-23 | 2010-07-14 | 汪玉奎 | Self-relief gate valve |
| CN201836479U (en) * | 2010-08-26 | 2011-05-18 | 京东大型阀门有限公司 | Safety relief device of metal two-way sealing valve cavity |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103410997A (en) * | 2013-08-26 | 2013-11-27 | 南通国电电站阀门有限公司 | High-pressure-relief type parallel-double-gate single side hard sealing gate valve |
| CN103410997B (en) * | 2013-08-26 | 2015-08-19 | 南通国电电站阀门有限公司 | High pressure relief formula double disc parallel seat single-face hard sealing gate valve |
| CN104534114A (en) * | 2015-01-26 | 2015-04-22 | 浙江德卡控制阀仪表有限公司 | Pilot bidirectional double-disc high-pressure gate valve |
| CN104534114B (en) * | 2015-01-26 | 2017-08-01 | 浙江德卡控制阀仪表有限公司 | The two-way double disc high pressure sluice valve of pilot-operated type |
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| C06 | Publication | ||
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| CB02 | Change of applicant information |
Address after: 313100 No. 659 Changxin Avenue, Taihu street, Zhejiang, Changxing County Applicant after: ZHEJIANG ZHONGDE AUTOMATIC CONTROL TECHNOLOGY CO., LTD. Address before: 313100, No. three, No. 659, Changxin Economic Development Zone, Huzhou, Zhejiang Applicant before: Zhejiang Zhongde Automatic Control Valve Co., Ltd. |
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Free format text: CORRECT: APPLICANT; FROM: ZHEJIANG ZHONGDE AUTOMATIC CONTROL VALVE CO., LTD. TO: ZHEJIANG ZHONGDE AUTOMATIC CONTROL TECHNOLOGY CO., LTD. |
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Application publication date: 20130612 |