CN104500762A - Protection structure of pilot sealing surface of electromagnetic decompression valve - Google Patents
Protection structure of pilot sealing surface of electromagnetic decompression valve Download PDFInfo
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- CN104500762A CN104500762A CN201410755840.9A CN201410755840A CN104500762A CN 104500762 A CN104500762 A CN 104500762A CN 201410755840 A CN201410755840 A CN 201410755840A CN 104500762 A CN104500762 A CN 104500762A
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- valve
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- water
- sealing surface
- conical surface
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- 238000007789 sealing Methods 0.000 title claims abstract description 76
- 230000006837 decompression Effects 0.000 title abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 66
- 230000005494 condensation Effects 0.000 claims description 36
- 238000009833 condensation Methods 0.000 claims description 36
- 241001347978 Major minor Species 0.000 claims description 14
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract 2
- 239000000047 product Substances 0.000 description 19
- 238000010586 diagram Methods 0.000 description 12
- 239000002352 surface water Substances 0.000 description 3
- 230000002146 bilateral effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Classifications
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- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
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- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
-
- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0644—One-way valve
- F16K31/0655—Lift valves
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
- Lift Valve (AREA)
Abstract
The invention discloses a protection structure of a pilot sealing surface of an electromagnetic decompression valve. According to key points of the technical scheme, the lower end of a valve cover is provided with a pilot valve seat, the lower end of a valve cover steam exhaust passage is provided with a water guide conical surface, an annular water chamber with an opening facing upwards is formed in the lower side, on the water guide conical surface, of the pilot valve seat, the water chamber is separated from a steam through hole in the middle of the pilot valve seat through an annular water separation wall, the outer diameter of the upper end of the water separation wall is smaller than the inner diameter of the lower end of the water guide conical surface, and condensed water flowing down from the valve cover steam exhaust passage can flow into the water chamber along the surface of the water guide conical surface. The protection structure has beneficial effects that the problem of the traditional product that the condensed water can enter the pilot sealing surface to cause the deformation and leakage of the sealing surface can be avoided, the sealing performance and sealing reliability of an auxiliary valve and a main valve sealing surface can be maintained durable, and the valve can be reliably used in a thermal power generating unit and especially in a high-capacity high-parameter super-critical thermal power generating unit.
Description
Technical field
The present invention relates to a kind of valve mechanism, be specifically related to the partial structurtes of the electromagnetic relief valve that a kind of power station main steam system uses.
Background technique
Electromagnetic relief valve is used for opening discharged steam fast when main steam (overheated vapour) pressure of fired power generating unit exceedes specified value, avoid the spring safety valve events of main steam system as far as possible, thus maintain the Performance And Reliability of main steam safety valve, the use technology cycle of prolongation main steam safety valve, make the safety assurance ability that unit keeps enough.Main steam system supporting electromagnetic relief valve in current thermal power plant mainly contains two types from product structure, one class is the split type American structure (Fig. 1) of the major-minor valve of representative with the product of the enterprises such as U.S. De Laisai-Kang Suo Reed (Dresser-Consolidated) and Crosby (Crosby), adopt main valve clack sealing surface upward, the structural type of top steam discharge: the another kind of all-in-one-piece structure of major-minor valve being product that is wild with Japanese ridge and East Asia two company and being representative, adopt main valve clack sealing surface down, the structural type of left and right bilateral steam discharge.Although the product of different manufacturers has larger difference in CONSTRUCTED SPECIFICATION, product substantially can be included into one of two above-mentioned types in general structure pattern.Electromagnetic relief valve is important mating valve and the critical valves of fired power generating unit.
Existing all kinds of split type and all-in-one-piece electromagnetic relief valve product in use also exists such problem all in varying degrees: after valve opening and discharge for several times, namely guide's sealing surface (see Fig. 2) of auxiliary valve starts to occur leaking, and even starts large leakage; Two problems below auxiliary valve sealing surface often can cause again occurring after occurring comparatively significantly leaking, one be due to auxiliary valve leak make guide be sealed to the space between main valve clack pressure drop, main valve clack back pressure is not enough and cause main valve to occur leaking; Two is that auxiliary valve continues leakage and can make constantly have high-temperature steam to overflow on the upside of auxiliary valve valve gap, not only can bring certain influence to production environment, the remarkable increase of ambient humidity brings impact also can to the functional reliability of drive unit, particularly seriously, spring for making the valve rod after unlatching close reset and stretching valve rod on the upside of valve gap, be positioned at the outlet port of steam effusion, the high-temperature steam effusion continued can make the mechanical property of spring be subject to more serious impact, reduce its elasticity, and then can aggravate to leak, and the performance of valve and reliability can be made to be affected;
During electromagnetic relief valve product uses, the reasons for the above problems are: after valve steam discharge, a certain amount of steam can be retained in exhaust steam pipe and guide's sealing surface exhaust passage upwards, these steam is understood condensation and forms water of condensation, along with the condensation gradually of steam, the different parts of the guide's sealing surface to auxiliary valve is oozed under constantly having water of condensation, because the downside of auxiliary valve guide sealing surface is high-temperature steam, guide's sealing surface is in the condition of high temperature, oozing under water of condensation to auxiliary valve guide sealing surface makes sealing surface different parts produce inhomogeneous deformation because of continuous local cooling, guide's sealing surface is caused namely to start in use for some time to occur leaking.
The auxiliary valve of electromagnetic relief valve and the leakage of main valve oneself become the comparatively general problem of this product, power station user can be absorbed in awkward situation at one's wit's end, at a loss what to do when in the face of problems such as the frequent of electromagnetic relief valve product and serious leak.Electromagnetic relief valve has become fired power generating unit mating valve in use one of critical valves that always there is more problem, and electromagnetic relief valve product use Problems existing also becomes long-standing problem power station user, require that the product technology problem of solving as early as possible and must be puted forth effort by product specification manufacturing firm.Especially along with the capacity of fired power generating unit is increasing, temperature and pressure parameter is more and more higher, automaticity is more and more perfect, safe, reliable, the economical operation of power station unit more and more come into one's own, and address these problems and also become more and more urgent.
Summary of the invention
In order to overcome the above-mentioned deficiency existing for existing structure, the present invention proposes one and can ensure that guide's sealing surface place does not have water of condensation and enters and cause sealing surface to be out of shape, be conducive to making guide's sealing surface to keep the safeguard structure of power station main steam system electromagnetic relief valve guide sealing surface of lasting sealability and sealing reliability, guarantee valve reliably working.
To achieve these goals, the present invention is by the following technical solutions:
A kind of safeguard structure of electromagnetic relief valve guide sealing surface, described electromagnetic relief valve comprises major-minor valve integrated type, guide's sealing configuration is arranged on the electromagnetic relief valve on the upside of main valve clack and major-minor valve is split type, guide's sealing configuration is arranged on electromagnetic relief valve on auxiliary valve, guide's sealing configuration is positioned at the downside of the valve gap of main valve or auxiliary valve, and valve rod is upward through the valve gap exhaust passage be positioned on the upside of guide's sealing configuration in the middle part of valve gap.The major technique key of technical solution of the present invention is: the lower end of valve gap is provided with guide's valve seat, and guide's valve seat and valve gap are connected and sealed, and guide's valve seat is provided with the sealing surface corresponding with the valve stem seal face of stem lower portion, the conical surface-water guide the conical surface of the toroidal that down diameter increases is provided with in the lower end of valve gap exhaust passage, groove-the hydroecium of opening up annular is provided with in the downside being positioned at the above-mentioned water guide conical surface of first guide valve seat, between the steam through flow hole of hydroecium and guide's valve seat centre, have and up to extend inside hydroecium, the water-resisting wall of ring is separated by, the upper end external diameter of water-resisting wall is less than the internal diameter of water guide conical surface lower end, thus between the upper end of water-resisting wall and the lower end of the water guide conical surface, certain through-flow gap is had, the water of condensation flowed down from the hole wall of valve gap exhaust passage can flow into downwards in hydroecium along the surface of the water guide conical surface.
Guide's valve seat and valve gap be sealedly connected with following three kinds of Placements:
Guide's valve seat and valve gap are connected and sealed by screw thread and weld seam.
Guide's valve seat and valve gap are connected and sealed by screw thread and sealing gasket.
Guide's valve seat is connected by weld seam with valve gap.
Electromagnetic relief valve of the present invention, its driving mechanism comprises the driving mechanism being provided active force by electromagnet, and provides the driving mechanism of active force by electromagnetic valve Pneumatic actuator.
The invention has the beneficial effects as follows: after adopting the safeguard structure of the guide's sealing surface described in technological scheme of the present invention, the power station main steam system electromagnetic relief valve water of condensation no longer had existing for existing product can be ensured to enter guide's sealing surface place and cause sealing surface to be out of shape and leak, be conducive to making auxiliary valve and main valve sealing surface keep lasting sealability and sealing reliability, valve is especially reliably used in fired power generating unit in the super (super-) critical fired power generating unit of Large Copacity, high parameter, ensures unit safety, reliable, economical operation.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the split type electromagnetic relief valve of the major-minor valve of a kind of existing product one.
Fig. 2 is the partial structurtes schematic diagram at the auxiliary valve position of electromagnetic relief valve shown in Fig. 1.
Fig. 3 is the schematic diagram that the embodiment of the present invention one-guide sealing surface safeguard structure is applied on the all-in-one-piece electromagnetic relief valve product of major-minor valve.
Fig. 4 is the partial structurtes schematic diagram that the guide of embodiment one seals position.
Fig. 5 is the schematic diagram that the embodiment of the present invention two-guide sealing surface safeguard structure is applied on the electromagnetic relief valve product that major-minor valve is split type.
Fig. 6 is the partial structurtes schematic diagram that the guide of embodiment two seals position.
Fig. 7 is the schematic diagram that guide's valve seat of embodiment one and valve gap are connected and sealed by screw thread and sealing gasket.
Fig. 8 is the schematic diagram that guide's valve seat of embodiment one and valve gap are connected and sealed by weld seam.
Fig. 9 is the schematic diagram that guide's valve seat of embodiment two and valve gap are connected and sealed by screw thread and sealing gasket.
Figure 10 is the schematic diagram that guide's valve seat of embodiment two and valve gap are connected and sealed by weld seam.
In figure, 1, valve body of main valve; 2, auxiliary valve body; 3, valve gap; 4, valve gap exhaust passage; 5, valve rod; 6, guide's valve seat; 7, exhaust steam pipe; 8, the water guide conical surface; 9, hydroecium; 10, water-resisting wall; 11, valve stem seal face.
Embodiment
Below in conjunction with drawings and Examples, technological scheme of the present invention is further elaborated.
Technological scheme of the present invention be not limited in be applied in two types that following two embodiments address electromagnetic relief valve on.
Embodiment one
The schematic diagram of a kind of concrete enforcement structure that the safeguard structure technological scheme of guide's sealing surface of the present invention is applied on major-minor valve all-in-one-piece electromagnetic relief valve product as shown in Figure 3 and Figure 4.
The electromagnetic relief valve of the present embodiment be main valve clack sealing surface down, the exhaust of left and right bilateral, the all-in-one-piece structure of major-minor valve, guide's sealing configuration is arranged on the downside of the upside of main valve clack, the valve gap (3) of valve body of main valve (1) upper end, valve rod (5) is upward through the valve gap exhaust passage (4) be positioned on the upside of guide's sealing configuration at valve gap (3) middle part, and valve rod (5) upper end is docked with solenoid actuated mechanism and driven by solenoid actuated mechanism and perform valve opening and close valve events.In the lower end of valve gap (3), guide's valve seat (6) is installed, described guide's valve seat (6) and valve gap (3), by the valve gap that screw thread and weld seam are connected and sealed, weld seam is positioned at threaded lower end (3) lower surface place, guide's valve seat (6) are provided with the inverted cone sealing surface of dehiscing downward corresponding with the valve stem seal face (11) of valve rod (5) bottom.Be provided with the conical surface-water guide conical surface (8) of the toroidal that down diameter increases in the lower end of valve gap exhaust passage (4), the water guide conical surface (8) is the less conical surface of angle of taper, and in the present embodiment, its semi-cone angle is by 7.5 ° of processing, groove-the hydroecium (9) of opening up annular is provided with in the downside being positioned at the above-mentioned water guide conical surface (8) of first guide valve seat (6), between the steam through flow hole of hydroecium (9) and guide's valve seat (6) centre, have and up extend from hydroecium (9) inner side, the water-resisting wall (10) of ring is separated by, the upper end external diameter of water-resisting wall (10) is less than the internal diameter of the water guide conical surface (8) lower end, thus between the upper end of water-resisting wall (10) and the lower end of the water guide conical surface (8), certain through-flow gap is had, the water of condensation flowed down from the hole wall of valve gap exhaust passage (4) can flow into downwards in hydroecium (9) along the surface of the water guide conical surface (8).
Be tightly connected except by except above-mentioned mode of to be undertaken being connected by screw thread and weld seam between guide's valve seat (6) with valve gap (3), also the mode of be connected and sealed (Fig. 7) by screw thread and sealing gasket or be connected and sealed by weld seam (Fig. 8) can be adopted, its effect is the same with the connection effect of screw thread+weld seam, as long as can ensure cut off completely between guide's valve seat (6) downside and valve gap exhaust passage (4), ensure to seal.
After discharge of steam, the steam be deposited in blow-off line and valve gap exhaust passage (4) condensation can form water of condensation gradually, and water of condensation can cause the inhomogeneous deformation of sealing surface after flowing back to guide's sealing surface position and cause leakage.The water of condensation container structure set in the downside of valve gap (3) being installed on valve body of main valve (1) upper end and guide's valve seat (6) of the present embodiment can guarantee that water of condensation can not flow to guide's sealing surface place: in the water of condensation of formation in valve gap exhaust passage (4) and exhaust steam pipe (7), this part water of condensation flowed down along the hole wall of valve gap exhaust passage (4) can flow in hydroecium (9) downwards and completely along the surface of the water guide conical surface (8), due to the bottom of hydroecium (9) and the close together of sealing surface, temperature is higher, thus the water of condensation flowing into hydroecium (9) can gasify rapidly or gradually again, the water of condensation that a small amount of suitable valve rod (5) surface in addition declines, because the temperature of valve rod (5) hypomere is higher, can gasify gradually and can not arrive the sealing surface place of valve rod (5) lower end in the water of condensation midway thus declined.Therefore, the above-mentioned water of condensation container structure water of condensation that can reliably solve existing for the all-in-one-piece electromagnetic relief valve product of existing major-minor valve is relied on to affect the problem of guide's sealing surface sealing.
Why the water guide conical surface (8) is set to the less conical surface of angle of taper, is to consider to ensure that water of condensation can flow downward along the conical surface and can enter hydroecium (9), and can not drip and flow to guide's sealing surface place.
Embodiment two
The schematic diagram of a kind of concrete enforcement structure that the safeguard structure technological scheme of guide's sealing surface of the present invention is applied on the electromagnetic relief valve product that major-minor valve is split type as shown in Figure 5 and Figure 6.
The electromagnetic relief valve of the present embodiment be main valve clack sealing surface upward, the split type structure of top exhaust, the auxiliary valve of main valve, guide's sealing configuration is arranged on the downside of the valve gap (3) of auxiliary valve body (2) upper end on auxiliary valve (shown in Fig. 5).The lower end of valve gap (3) is provided with guide's valve seat (6), guide's valve seat (6) and valve gap (3) are connected and sealed by screw thread and weld seam, weld seam is positioned at the valve gap (3) on the upside of screw thread and the cylindrical place of guide's valve seat (6), and guide's valve seat (6) is provided with the inverted cone sealing surface corresponding with the valve stem seal face (11) of valve rod (5) bottom.Be provided with the conical surface-water guide conical surface (8) of toroidal in the lower end of valve gap exhaust passage (4), the water guide conical surface (8) is the less conical surface of angle of taper, groove-the hydroecium (9) of opening up annular is provided with in the downside being positioned at the above-mentioned water guide conical surface (8) of first guide valve seat (6), between the steam through flow hole of hydroecium (9) and guide's valve seat (6) centre, be provided with and up extend from hydroecium (9) inner side, the water-resisting wall (10) of ring makes both be separated by, the upper end external diameter of water-resisting wall (10) is less than the internal diameter of the water guide conical surface (8) lower end, make there is certain through-flow gap between the lower end of the upper end of water-resisting wall (10) and the water guide conical surface (8), can flow in hydroecium (9) downwards along the surface of the water guide conical surface (8) when water of condensation flows down from the hole wall of valve gap exhaust passage (4).
Being tightly connected between guide's valve seat (6) and valve gap (3), except can by except above-mentioned mode of to be undertaken being connected by screw thread and weld seam, equally also can adopt the mode of be connected and sealed (Fig. 9) by screw thread and sealing gasket or be connected and sealed by weld seam (Figure 10), as long as can ensure cut off completely and seal between guide's valve seat (6) and valve gap exhaust passage (4).
Being deposited in steam in exhaust steam pipe and valve gap exhaust passage (4) after discharge of steam can condensation and form water of condensation gradually, and water of condensation can cause the inhomogeneous deformation of sealing surface after flowing back to guide's sealing surface position and cause leakage.The water of condensation container structure set in the downside of valve gap (3) being installed on auxiliary valve body (2) upper end and guide's valve seat (6) of the present embodiment can guarantee that water of condensation can not flow to guide's sealing surface place: in the water of condensation formed in valve gap exhaust passage (4) and exhaust steam pipe (7), this part water of condensation flowed down along the hole wall of valve gap exhaust passage (4) can flow in hydroecium (9) downwards and completely along the surface of the water guide conical surface (8), because the bottom of hydroecium (9) and the close together of sealing surface, temperature is higher, thus the water of condensation flowing into hydroecium (9) can gasify rapidly or gradually again, the water of condensation that a small amount of suitable valve rod (5) surface in addition declines, because the temperature of valve rod (5) hypomere is higher, can gasify gradually and can not arrive the sealing surface place of valve rod (5) lower end in the water of condensation midway thus declined.Thus rely on above-mentioned water of condensation container structure can reliably solve the split type water of condensation existing for electromagnetic relief valve product of existing major-minor valve affect guide's sealing surface sealing problem.
The content that this specification is not described in detail belongs to the known prior art of professional and technical personnel in the field.
Below done to illustrate to technological scheme of the present invention in conjunction with the accompanying drawings and embodiments, but these accompanying drawings and explanation can not be understood to limit scope of the present invention.Those skilled in the art should know; the present invention is not subject to the restriction of above-described embodiment and accompanying drawing; its protection domain defined by appending claims; any in the technological scheme not exceeding the various changes in the scope that claims of the present invention defines, modification is formed; all do not depart from spirit of the present invention and technical spirit, still can belong within right of the present invention.
Claims (4)
1. the safeguard structure of an electromagnetic relief valve guide sealing surface, described electromagnetic relief valve comprises major-minor valve integrated type, guide's sealing configuration be arranged on electromagnetic relief valve on the upside of main valve clack and major-minor valve split type, guide's sealing configuration is arranged on the electromagnetic relief valve on auxiliary valve, guide's sealing configuration is positioned at the downside of the valve gap (3) of main valve or auxiliary valve, valve rod (5) is upward through the valve gap exhaust passage (4) be positioned on the upside of guide's sealing configuration at valve gap (3) middle part, it is characterized in that: the lower end of valve gap (3) is provided with guide's valve seat (6), guide's valve seat (6) and valve gap (3) are connected and sealed, guide's valve seat (6) is provided with the sealing surface corresponding with the valve stem seal face (11) of valve rod (5) bottom, the conical surface one water guide conical surface (8) of the toroidal that down diameter increases is provided with in the lower end of valve gap exhaust passage (4), groove one hydroecium (9) of opening up annular is provided with in the downside being positioned at the above-mentioned water guide conical surface (8) of first guide valve seat (6), between the steam through flow hole of hydroecium (9) and guide's valve seat (6) centre, have and up extend from hydroecium (9) inner side, the water-resisting wall (10) of ring is separated by, the upper end external diameter of water-resisting wall (10) is less than the internal diameter of the water guide conical surface (8) lower end, thus between the upper end of water-resisting wall (10) and the lower end of the water guide conical surface (8), certain through-flow gap is had, the water of condensation flowed down from the hole wall of valve gap exhaust passage (4) can flow into downwards in hydroecium (9) along the surface of the water guide conical surface (8).
2. the safeguard structure of electromagnetic relief valve guide sealing surface according to claim 1, is characterized in that: guide's valve seat (6) and valve gap (3) are connected and sealed by screw thread and weld seam.
3. the safeguard structure of electromagnetic relief valve guide sealing surface according to claim 1, is characterized in that: guide's valve seat (6) and valve gap (3) are connected and sealed by screw thread and sealing gasket.
4. the safeguard structure of electromagnetic relief valve guide sealing surface according to claim 1, is characterized in that: guide's valve seat (6) is connected by weld seam with valve gap (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410755840.9A CN104500762A (en) | 2014-12-08 | 2014-12-08 | Protection structure of pilot sealing surface of electromagnetic decompression valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410755840.9A CN104500762A (en) | 2014-12-08 | 2014-12-08 | Protection structure of pilot sealing surface of electromagnetic decompression valve |
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| CN104500762A true CN104500762A (en) | 2015-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410755840.9A Pending CN104500762A (en) | 2014-12-08 | 2014-12-08 | Protection structure of pilot sealing surface of electromagnetic decompression valve |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1091753A (en) * | 1965-02-24 | 1967-11-22 | Dresser Ind | Improvements in or relating to a high pressure safety valve |
| US4366833A (en) * | 1979-06-20 | 1983-01-04 | Sulzer Brothers Limited | Steam throttle valve |
| CN85104248A (en) * | 1985-06-10 | 1986-12-10 | 机械工业部哈尔滨锅炉厂 | Pilot operated safety valve |
| JP2011122503A (en) * | 2009-12-10 | 2011-06-23 | Toshiba Corp | Steam valve and shaft seal device |
| CN202756841U (en) * | 2012-09-05 | 2013-02-27 | 中国石油化工集团公司 | Backpressure proof device for discharge port of steam safety valve |
| CN203743539U (en) * | 2014-03-07 | 2014-07-30 | 武汉锅炉集团阀门有限责任公司 | Magnetic pressure release valve |
| CN204420143U (en) * | 2014-12-08 | 2015-06-24 | 章华 | The safeguard structure of electromagnetic relief valve guide sealing surface |
-
2014
- 2014-12-08 CN CN201410755840.9A patent/CN104500762A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1091753A (en) * | 1965-02-24 | 1967-11-22 | Dresser Ind | Improvements in or relating to a high pressure safety valve |
| US4366833A (en) * | 1979-06-20 | 1983-01-04 | Sulzer Brothers Limited | Steam throttle valve |
| CN85104248A (en) * | 1985-06-10 | 1986-12-10 | 机械工业部哈尔滨锅炉厂 | Pilot operated safety valve |
| JP2011122503A (en) * | 2009-12-10 | 2011-06-23 | Toshiba Corp | Steam valve and shaft seal device |
| CN202756841U (en) * | 2012-09-05 | 2013-02-27 | 中国石油化工集团公司 | Backpressure proof device for discharge port of steam safety valve |
| CN203743539U (en) * | 2014-03-07 | 2014-07-30 | 武汉锅炉集团阀门有限责任公司 | Magnetic pressure release valve |
| CN204420143U (en) * | 2014-12-08 | 2015-06-24 | 章华 | The safeguard structure of electromagnetic relief valve guide sealing surface |
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