CN111981168A - Pilot operated safety valve - Google Patents
Pilot operated safety valve Download PDFInfo
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- CN111981168A CN111981168A CN202010895589.1A CN202010895589A CN111981168A CN 111981168 A CN111981168 A CN 111981168A CN 202010895589 A CN202010895589 A CN 202010895589A CN 111981168 A CN111981168 A CN 111981168A
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- main valve
- valve seat
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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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/10—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with auxiliary valve for fluid operation of the main valve
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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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/164—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side and remaining closed after return of the normal pressure
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
Abstract
The invention discloses a pilot operated safety valve, and relates to the technical field of safety protection equipment for natural gas collection and transmission pipelines. The pilot operated safety valve comprises a pilot valve and a main valve, wherein the pilot valve comprises a pilot valve seat, a pilot valve clack, a pilot valve rod, a lower valve body, an upper valve body and a pilot valve cover; the main valve comprises a main valve body, a main valve seat, a main valve core, a main valve sleeve and a main valve cover; the valve seat sealing O-shaped ring is arranged on the end face of the valve seat of the pilot valve, an annular dovetail groove is formed in the end face of the valve seat of the pilot valve, the valve seat sealing O-shaped ring is fixed in the annular dovetail groove, a boss is arranged on the valve clack of the pilot valve, when the valve is closed, the boss at the bottom of the valve clack of the pilot valve enters the annular dovetail groove, the valve seat sealing O-shaped ring is axially compressed to deform. The pilot operated safety valve has the advantages of good sealing performance, low failure rate, capability of increasing the set pressure value of the pilot operated safety valve to 32MPa, high-precision discharge, small return seat pressure difference and obvious burst action.
Description
Technical Field
The invention relates to the technical field of safety protection equipment for natural gas acquisition and transmission pipelines, in particular to a pilot operated safety valve.
Background
The pilot operated safety valve is a main safety protection device of a natural gas collecting and transporting pipeline and has the function of automatically opening overpressure gas in a discharge pipeline when the pressure of the pipeline abnormally reaches a set value of the safety valve so as to avoid safety accidents such as pipeline burst and the like caused by continuous rising of the pressure of the pipeline.
At present, the pilot valve clack sealing modes of pilot operated safety valves used on site are generally divided into two modes, namely O-shaped ring radial sealing and clack vulcanized rubber end face sealing, and the two sealing modes have defects according to long-term use on site, so that the reliability of the valves is reduced, and the maintenance rate is increased.
The O-shaped ring is embedded in an inner hole of a valve seat of the pilot valve in the radial sealing manner, and the valve clack is provided with a boss, so that the valve seat is guided into the inner hole of the valve seat and the O-shaped ring is extruded to deform when the valve is closed, thereby realizing sealing. The problem is that the sealing ring can be sheared by the valve clack boss in the process of extruding the sealing ring, the closing speed is high, the O-shaped ring is easily sheared and damaged to cause poor sealing, and the failure rate is high.
The valve clack vulcanized rubber end face seal is formed by injecting rubber into a valve clack inner hole after high-temperature liquefaction, a boss is designed on a valve seat, and the valve seat boss is used for compressing rubber for sealing. This form of seal has the following disadvantages in field use:
(1) in order to avoid the rubber from being compressed excessively to cause failure and cracking, a limit is designed on the boss of the valve seat, and the compression amount of the rubber is fixed. The rebound resilience of vulcanized rubber is poor, after the vulcanized rubber is compressed for a period of time, compression dents appear on the vulcanized rubber and the vulcanized rubber cannot be completely rebounded, so that the actual compression amount is reduced, the sealing force is insufficient, and the valve clack of the pilot valve starts to leak air under the condition that the actual pressure set value of the safety valve is not reached, so that the upper cavity of the main valve is decompressed, the safety valve malfunctions, and the failure rate is high;
(2) the elasticity of vulcanized rubber of the valve clack is poor, and through practice, even if the best vulcanization process is adopted, the use pressure can only reach 15MPa, and the safety protection requirements of higher-pressure gas transmission and storage cannot be met.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention provides a pilot operated safety valve, and aims to solve the problems of high maintenance rate, high failure rate, poor sealing and the like of the conventional pilot operated safety valve. The pilot operated safety valve of the invention, set up the O-ring of the pilot valve in the pilot valve base end, offer the annular dovetail on the valve base end of the pilot valve, the O-ring is fixed in dovetail, set up the boss on the pilot valve clack, when closing, the valve clack boss enters the dovetail and compresses the deformation of the O-ring, the pilot valve closes. The pilot operated safety valve has the advantages of good sealing performance, low failure rate, capability of increasing the set pressure value of the pilot operated safety valve to 32MPa, high-precision discharge, small return seat pressure difference and obvious burst action.
In order to solve the problems in the prior art, the invention is realized by the following technical scheme:
a pilot operated safety valve, comprising a pilot valve and a main valve, characterized in that: the pilot valve comprises a pilot valve seat, a pilot valve clack, a pilot valve rod, a lower valve body, an upper valve body and a pilot valve cover, wherein the pilot valve seat is arranged in the lower valve body; the main valve comprises a main valve body, a main valve seat, a main valve core, a main valve sleeve and a main valve bonnet, wherein the main valve seat is arranged in the valve body; the main valve spring is arranged between the main valve cover and the main valve core; the end face of the pilot valve seat is provided with a valve seat sealing O-shaped ring, the end face of the pilot valve seat is provided with an annular dovetail groove, and the valve seat sealing O-shaped ring is fixed in the annular dovetail groove; the inner diameter of the annular dovetail groove is larger than that of the valve seat sealing O-shaped ring, and the valve seat sealing O-shaped ring is tightly stretched in the annular dovetail groove and fixed by the annular dovetail groove; an annular boss is arranged at the position, corresponding to the annular dovetail groove, of the bottom of the pilot valve clack, when the pilot valve clack is closed, the boss at the bottom of the pilot valve clack enters the dovetail groove to axially compress the valve seat to seal the O-shaped ring to deform, and the pilot valve is closed; the width of the bottom of the dovetail groove is larger than that of the notch; and the width of the groove at the bottom is larger than the diameter of the section of the O-shaped sealing ring of the valve seat, and the width of the groove opening is smaller than the diameter of the section of the O-shaped sealing ring of the valve seat. It works as follows: the pilot safety valve mainly comprises a pilot valve and a main valve, wherein the pilot valve is a pilot safety valve control mechanism, and the performance and the reliability of the pilot safety valve directly determine the precision and the service life of the pilot safety valve. One end of the pilot valve is connected with the inlet end of the main valve through a bleed pipe, and the other end of the pilot valve is connected with the upper cavity of the main valve through the bleed pipe. When the pressure of the protected pipeline reaches the set value of the spring of the safety valve and the pilot valve, the spring is compressed, the valve clack of the pilot valve is opened, and because the area of the damping hole at the air inlet end of the pilot valve is far smaller than the area of the air introducing hole connected with the upper cavity of the main valve, the upper cavity of the main valve is decompressed, the valve clack of the main valve is quickly opened under the pushing of the inlet pressure, and the main valve discharges the. When the pressure of the protected pipeline is reduced to a set value of the pilot valve spring, the valve clack of the pilot valve is closed, the upper cavity of the main valve is filled with air and reaches inlet pressure, and the main valve is closed under the reset pressure of the main valve spring.
It has the structural characteristics that: the O-shaped ring is arranged on the end face of the valve seat and fixed in the dovetail groove, the valve clack is provided with a boss, when the valve clack is closed, the boss of the valve clack enters the dovetail groove to compress the O-shaped ring to deform, and the pilot valve is closed. The inner diameter of the dovetail groove is larger than that of the O-shaped ring, and the O-shaped ring is tightly stretched in the dovetail groove and fixed by the dovetail groove, so that the air flow is prevented from being impacted and falling off. When the valve clack is closed, the O-shaped ring is axially compressed to deform, so that the O-shaped ring cannot be sheared and damaged, and the valve clack is safe and reliable after long-term use on site. The problems that a sealing piece for closing the pilot valve is easy to damage and the field maintenance rate is high are solved.
In order to better implement the technical scheme of the invention, the invention also has the following technical characteristics:
the pilot valve seat sealing O-shaped ring is an AED implosion-resistant O-shaped ring with Vickers hardness of 90 degrees. The sealing performance is excellent under the working pressure of 32MPa, meanwhile, when the valve clack of the pilot valve is opened and discharged instantly, the O-shaped ring can be prevented from being torn from the inside, the service pressure of the prior pilot-operated safety valve is improved to 32MPa, and meanwhile, the service life is excellent.
The piston is arranged in the valve cage cavity and moves along with the valve rod of the pilot valve in the valve cage cavity; the piston and the lower valve body are sealed by an O-shaped ring.
The area of the piston is larger than that of the valve clack, and an exhaust damping hole is designed in the piston.
The pilot valve clack, the piston and the pilot valve rod are integrated. The area of the piston is larger than that of the valve clack, the piston and the valve body are sealed by an O-shaped ring, and an exhaust damping hole is designed on the piston. When the pilot valve is discharged, the gas discharged by the valve clack is discharged through the piston exhaust damping hole. At the moment, pressure difference exists between the upper cavity and the lower cavity of the piston, and under the action of piston area amplification, the valve clack of the pilot valve is opened instantly, gas can push the piston to drive the valve clack to instantly open fully, so that the gas on the upper cavity of the main valve can be released rapidly, the overpressure main valve can be opened fully rapidly, the overpressure of the safety valve can be released immediately, and potential safety hazards caused by continuous rising of the pressure of a protected pipeline can be avoided.
The pilot valve seat is fixedly arranged in the lower valve body through a valve seat connecting piece, and the dovetail groove is formed between the inner side of the valve seat connecting piece and the outer side of the end part of the valve seat. The valve seat is convenient to fix and mount and convenient to process.
The inlet pressure of the main valve is connected to the pilot valve through an air inlet pipe, and the upper cavity of the main valve is communicated with the pilot valve through an air guide pipe; an air inlet pipe pressure interface is arranged below the pilot valve seat, a main valve upper cavity air-entraining channel is arranged in the pilot valve seat, and the air inlet channel of the air inlet pipe pressure interface is communicated with the main valve upper cavity air-entraining channel in the valve seat through an air inlet damping hole on the valve seat; and the area of the air inlet damping hole is smaller than the area of the air entraining passage on the upper cavity of the main valve. The air inlet damping hole and the air exhaust damping hole are arranged, the area of the air inlet damping hole is designed to be far smaller than the area of an air entraining channel on the upper cavity of the main valve, the air inlet damping hole is matched with the air exhaust damping hole, the pressure relief of the main valve is stable, the pressure of a return seat is small, and the outburst opening effect is obvious.
The valve cage cavity is communicated with a discharge port formed in the lower valve body.
The operating principle of the pilot operated safety valve is as follows: the pilot safety valve mainly comprises a pilot valve and a main valve, wherein the pilot valve is a pilot safety valve control mechanism, and the performance and the reliability of the pilot safety valve directly determine the precision and the service life of the pilot safety valve. One end of the pilot valve is connected with the inlet end of the main valve through a bleed pipe, and the other end of the pilot valve is connected with the upper cavity of the main valve through the bleed pipe. When the pressure of the protected pipeline reaches the set value of the spring of the safety valve and the pilot valve, the spring is compressed, the valve clack of the pilot valve is opened, and because the area of the damping hole at the air inlet end of the pilot valve is far smaller than the area of the air introducing hole connected with the upper cavity of the main valve, the upper cavity of the main valve is decompressed, the valve clack of the main valve is quickly opened under the pushing of the inlet pressure, and the main valve discharges the. When the pressure of the protected pipeline is reduced to a set value of the pilot valve spring, the valve clack of the pilot valve is closed, the upper cavity of the main valve is filled with air and reaches inlet pressure, and the main valve is closed under the reset pressure of the main valve spring.
Compared with the prior art, the beneficial technical effects brought by the invention are as follows:
1. the invention mainly solves the problem of high maintenance rate of the prior pilot operated safety valve, adopts a reasonable structure, improves the set pressure value of the pilot operated safety valve to 32MPa, and has the characteristics of high-precision discharge, small pressure difference of a return seat and obvious burst opening effect.
2. The O-shaped ring is arranged on the end face of the valve seat and fixed in the dovetail groove, the valve clack is provided with a boss, when the valve clack is closed, the boss of the valve clack enters the dovetail groove to compress the O-shaped ring to deform, and the pilot valve is closed. The inner diameter of the dovetail groove is larger than that of the O-shaped ring, and the O-shaped ring is tightly stretched in the dovetail groove and fixed by the dovetail groove, so that the air flow is prevented from being impacted and falling off. When the valve clack is closed, the O-shaped ring is axially compressed to deform, so that the O-shaped ring cannot be sheared and damaged, and the valve clack is safe and reliable after long-term use on site. The problems that a sealing piece for closing the pilot valve is easy to damage and the field maintenance rate is high are solved.
3. The pilot valve seat sealing O-shaped ring is an AED (internal explosion) anti-implosion O-shaped ring with Vickers hardness of 90 degrees, has excellent sealing performance under the working pressure of 32MPa, can avoid the O-shaped ring from being torn from the inside when the valve clack of the pilot valve is opened instantly for discharge, improves the service pressure of the prior pilot safety valve to 32MPa, and has excellent service life.
4. The pilot valve clack, piston and valve rod are integrated, the area of piston is greater than that of valve clack, the piston and valve body are sealed by O-ring, and the piston is equipped with exhaust damping hole. When the pilot valve is discharged, the gas discharged by the valve clack is discharged through the piston exhaust damping hole. At the moment, pressure difference exists between the upper cavity and the lower cavity of the piston, and under the action of piston area amplification, the valve clack of the pilot valve is opened instantly, gas can push the piston to drive the valve clack to instantly open fully, so that the gas on the upper cavity of the main valve can be released rapidly, the overpressure main valve can be opened fully rapidly, the overpressure of the safety valve can be released immediately, and potential safety hazards caused by continuous rising of the pressure of a protected pipeline can be avoided.
5. The valve seat is fixedly installed in the lower valve body through the valve seat connecting piece, the dovetail groove is formed between the inner side of the valve seat connecting piece and the outer side of the end portion of the valve seat, the valve seat is convenient to fixedly install, and machining is convenient.
6. The air inlet damping hole and the air exhaust damping hole are arranged, the area of the air inlet damping hole is designed to be far smaller than the area of an air entraining channel on the upper cavity of the main valve, the air inlet damping hole is matched with the air exhaust damping hole, the pressure relief of the main valve is stable, the pressure of a return seat is small, and the outburst opening effect is obvious.
Drawings
FIG. 1 is a schematic cross-sectional view of a pilot operated safety valve according to the present invention;
FIG. 2 is a schematic cross-sectional view of a pilot valve of the pilot operated safety valve of the present invention;
FIG. 3 is a schematic diagram of the structure of the valve seat and the valve flap of the pilot operated relief valve of the present invention;
reference numerals: 1. pilot valve, 2, pilot valve seat, 3, pilot valve flap, 4, valve seat seal O-ring, 5, annular dovetail groove, 6, boss, 7, lower valve body, 8, upper valve body, 9, pilot valve cover, 10, cage cavity, 11, pilot valve stem, 12, pilot valve spring, 13, piston, 14, valve seat connector, 15, inlet pipe pressure interface, 16, main valve upper cavity, 17, inlet passage, 18, inlet orifice, 19, vent port, 20, main valve upper cavity bleed passage, 21, main valve, 22, exhaust orifice, 23, inlet pipe, 24, bleed pipe, 25, main valve body, 26, main valve seat, 27, main valve spool, 28, main valve sleeve, 29, main valve cover, 30, main valve spring.
Detailed Description
The technical scheme of the invention is further elaborated in the following by combining the drawings in the specification.
Referring to the attached figure 1 of the specification, the pilot operated safety valve comprises a pilot valve 1 and a main valve 21, wherein the pilot valve 1 is a pilot operated safety valve control mechanism, and the performance and the reliability of the pilot operated safety valve directly determine the precision and the service life of the pilot operated safety valve. The pilot valve 1 is connected at one end to the inlet end of the main valve 21 by an inlet pipe 23 and at the other end to the upper chamber 16 of the main valve by a bleed pipe 24. When the protected pipeline pressure reaches the set value of the safety valve pilot valve spring 12, the spring is compressed, the pilot valve clack 3 is opened, because the area of the damping hole at the air inlet end of the pilot valve 1 is far smaller than the area of the air guide hole for connecting the pilot valve 1 with the main valve upper cavity 16, the main valve upper cavity 16 releases pressure, the main valve clack 3 is quickly opened under the pushing of the inlet pressure, and the main valve discharges the protected pipeline pressure. The protected pilot line pressure drops below the set value of the pilot valve spring 12, the pilot valve flap 3 closes, the main valve upper chamber 16 admits air and reaches inlet pressure, and the main valve closes under the main valve spring 30 reset pressure.
As shown in fig. 1, the pilot valve 1 includes a pilot valve seat 2, a pilot valve flap 3, a pilot valve stem 11, a lower valve body 7, an upper valve body 8 and a pilot valve cover 9, the pilot valve seat 2 is installed in the lower valve body 7, a sealed cage cavity 10 is formed between the lower valve body 7 and the upper valve body 8, the pilot valve flap 3 and the pilot valve stem 11 connected with the pilot valve flap 3 are placed in the cage cavity 10, and the upper end of the pilot valve stem 11 extends out of the upper valve body 8 and is connected with a pilot valve spring 12 in the pilot valve cover 9; the main valve 21 comprises a main valve body 25, a main valve seat 26, a main valve spool 27, a main valve sleeve 28 and a main valve bonnet 29, wherein the main valve seat 26 is arranged in the main valve body 25, the main valve sleeve 28 is also arranged in the main valve body 25 and arranged on the main valve seat 26, the main valve spool 27 is arranged in the main valve sleeve 28 in a sliding manner, the lower end of the main valve spool 27 is matched with the main valve seat 26 to form a sealing pair, the upper end of the main valve spool 27 is connected with a main valve spring 30, and the main valve bonnet 29 is fixedly connected with the main valve body 25 to fix the main valve sleeve 28 in the main; the main valve spring 30 is interposed between the main valve bonnet 29 and the main valve spool 27.
As shown in fig. 3, the pilot valve comprises a pilot valve seat 2 and a pilot valve clack 3, a valve seat sealing O-ring 4 is arranged on the end face of the pilot valve seat 2, an annular dovetail groove 5 is formed on the end face of the pilot valve seat 2, and the valve seat sealing O-ring 4 is fixed in the annular dovetail groove 5; the inner diameter of the annular dovetail groove 5 is larger than that of the valve seat sealing O-shaped ring 4, and the valve seat sealing O-shaped ring 4 is tightly stretched in the annular dovetail groove 5 and is fixed by the annular dovetail groove 5; an annular boss 6 is arranged at the bottom of the pilot valve clack 3 corresponding to the annular dovetail groove 5, when the pilot valve clack 3 is closed, the boss 6 at the bottom of the pilot valve clack 3 enters the annular dovetail groove 5 to axially compress the valve seat sealing O-shaped ring 4 to deform, and the pilot valve 1 is closed; the width of the bottom groove of the annular dovetail groove 5 is larger than that of the notch; and the width of the groove at the bottom is larger than the diameter of the section of the valve seat sealing O-shaped ring 4, and the width of the groove opening is smaller than the diameter of the section of the valve seat sealing O-shaped ring 4. The O-shaped ring is arranged on the end face of the pilot valve seat 2 and fixed in the annular dovetail groove 5, the boss 6 is arranged on the pilot valve clack 3, when the pilot valve clack is closed, the boss 6 of the pilot valve clack 3 enters the annular dovetail groove 5 to compress the O-shaped ring to deform, and the pilot valve 1 is closed. The inner diameter of the annular dovetail groove 5 is larger than that of the O-shaped ring, and the O-shaped ring is tightly stretched in the annular dovetail groove 5 and fixed by the annular dovetail groove 5, so that the air flow is prevented from being impacted and falling off. When the valve clack 3 of the pilot valve is closed, the O-shaped ring is axially compressed to deform, the O-shaped ring cannot be sheared and damaged, and the valve clack is safe and reliable after being used on site for a long time. The problems that a sealing piece is easy to damage when the pilot valve 1 is closed and the field maintenance rate is high are solved.
The valve seat sealing O-shaped ring 4 of the pilot valve 1 is an AED (internal explosion protection) O-shaped ring with Vickers hardness of 90 degrees, has excellent sealing performance under the working pressure of 32MPa, can avoid the O-shaped ring from being torn from the inside when the valve clack 3 of the pilot valve is opened and discharged instantly, improves the service pressure of the prior pilot safety valve to 32MPa, and has excellent service life.
As shown in fig. 2, the pilot valve further comprises a lower valve body 7, an upper valve body 8 and a pilot valve cover 9, the pilot valve seat 2 is installed in the lower valve body 7, a closed cage cavity 10 is formed between the lower valve body 7 and the upper valve body 8, the pilot valve clack 3 and a pilot valve rod 11 connected with the pilot valve clack 3 are placed in the cage cavity 10, and the upper end of the pilot valve rod 11 extends out of the upper valve body 8 and is connected with a pilot valve spring 12 in the pilot valve cover 9. A piston 13 is arranged on the pilot valve rod 11, and the piston 13 is arranged in the valve cage cavity 10 and moves along with the pilot valve rod 11 in the valve cage cavity 10; the piston 13 and the lower valve body 7 are sealed by an O-shaped ring. The area of the piston 13 is larger than that of the valve clack 3, and an exhaust damping hole 22 is designed on the piston 13. The pilot valve flap 3, the piston 13 and the pilot valve stem 11 are integrated. The area of the piston 13 is larger than that of the pilot valve clack 3, the piston 13 and the lower valve body are sealed by an O-shaped ring, and an exhaust damping hole 22 is designed on the piston 13. When the pilot valve 1 is exhausted, gas exhausted by the pilot valve clack 3 is exhausted through the exhaust damping hole 22 of the piston 13. At the moment, pressure difference exists between the upper cavity and the lower cavity of the piston 13, and under the action of area amplification of the piston 13, the pilot valve clack 3 is opened instantly, so that gas can push the piston 13 to drive the pilot valve clack 3 to be opened fully instantly, and rapid gas release of the upper cavity 16 of the main valve is facilitated, and therefore the overpressure main valve can be opened fully rapidly, the safety valve is exhausted immediately after overpressure is achieved, and potential safety hazards caused by continuous rising of pressure of a protected pipeline are avoided.
The pilot valve seat 2 is fixedly arranged in the lower valve body 7 through a valve seat connecting piece 14, and the inner side of the valve seat connecting piece 14 and the outer side of the end part of the valve seat 2 form the annular dovetail groove 5. The pilot valve seat 2 is convenient to fix and install and convenient to process. An air inlet pipe pressure interface 15 is arranged below the pilot valve seat 2, a main valve upper cavity air-entraining channel 20 is arranged in the valve seat 2, and an air inlet channel 17 of the air inlet pipe pressure interface 15 is communicated with the main valve upper cavity air-entraining channel 20 in the valve seat 2 through an air inlet damping hole 18 on the valve seat 2; and the area of the air inlet damping hole 18 is smaller than that of the air entraining channel 20 on the upper cavity of the main valve, so that the pressure relief of the main valve is stable, the recoil pressure is low, and the outburst opening effect is obvious. The cage cavity 10 is communicated with a discharge port 19 formed in the lower valve body 7.
Claims (8)
1. A pilot operated safety valve comprising a pilot valve (1) and a main valve (21), characterized in that: the pilot valve (1) comprises a pilot valve seat (2), a pilot valve clack (3), a pilot valve rod (11), a lower valve body (7), an upper valve body (8) and a pilot valve cover (9), wherein the pilot valve seat (2) is installed in the lower valve body (7), a closed valve cage cavity (10) is formed between the lower valve body (7) and the upper valve body (8), the pilot valve clack (3) and the pilot valve rod (11) connected with the pilot valve clack (3) are arranged in the valve cage cavity (10), and the upper end of the pilot valve rod (11) extends out of the upper valve body (8) to be connected with a pilot valve spring (12) in the pilot valve cover (9); the main valve (21) comprises a main valve body (25), a main valve seat (26), a main valve core (27), a main valve sleeve (28) and a main valve cover (29), the main valve seat (26) is arranged in the main valve body (25), the main valve sleeve (28) is also arranged in the main valve body (25) and arranged on the main valve seat (26), the main valve core (27) is arranged in the main valve sleeve (28) in a sliding manner, the lower end of the main valve core (27) is matched with the main valve seat (26) to form a sealing pair, the upper end of the main valve core (27) is connected with a main valve spring (30), and the main valve cover (29) is fixedly connected with the main valve body (25) to fix the main valve sleeve (28) in the main valve body (25); the main valve spring (30) is arranged between the main valve cover (29) and the main valve core (27); a valve seat sealing O-shaped ring (4) is arranged on the end face of the pilot valve seat (2), an annular dovetail groove (5) is formed in the end face of the pilot valve seat (2), and the valve seat sealing O-shaped ring (4) is fixed in the annular dovetail groove (5); the inner diameter of the annular dovetail groove (5) is larger than that of the valve seat sealing O-shaped ring (4), and the valve seat sealing O-shaped ring (4) is tightly stretched in the annular dovetail groove (5) and is fixed by the annular dovetail groove (5); an annular boss (6) is arranged at the position, corresponding to the annular dovetail groove (5), of the bottom of the pilot valve clack (3), when the pilot valve clack (3) is closed, the boss (6) at the bottom of the pilot valve clack (3) enters the annular dovetail groove (5), the valve seat is axially compressed, the O-shaped sealing ring (4) deforms, and the pilot valve is closed; the width of the bottom groove of the annular dovetail groove (5) is larger than that of the groove opening; and the width of the groove at the bottom is larger than the diameter of the section of the valve seat sealing O-shaped ring (4), and the width of the groove opening is smaller than the diameter of the section of the valve seat sealing O-shaped ring (4).
2. A pilot operated safety valve according to claim 1, wherein: the valve seat sealing O-shaped ring (4) of the pilot valve (1) is an AED (AED) implosion resistant O-shaped ring with Vickers hardness of 90 degrees.
3. A pilot operated safety valve according to claim 1, wherein: a piston (13) is arranged on the pilot valve rod (11), and the piston (13) is arranged in the valve cage cavity (10) and moves along with the pilot valve rod (11) in the valve cage cavity (10); the piston (13) and the lower valve body (7) are sealed by an O-shaped ring.
4. A pilot operated safety valve according to claim 3, wherein: the area of the piston (13) is larger than that of the pilot valve clack (3), and an exhaust damping hole (22) is designed on the piston (13).
5. A pilot operated safety valve according to claim 3 or 4, wherein: the pilot valve clack (3), the piston (13) and the pilot valve stem (11) are integrated.
6. A pilot operated safety valve according to claim 1, wherein: the pilot valve seat (2) is fixedly arranged in the lower valve body (7) through a valve seat connecting piece (14), and the inner side of the valve seat connecting piece (14) and the outer side of the end part of the valve seat (2) form the annular dovetail groove (5).
7. A pilot operated safety valve according to claim 1, wherein: an air inlet pipe pressure interface (15) is arranged below the pilot valve seat (2), a main valve upper cavity air-entraining channel (20) is arranged in the pilot valve seat (2), and an air inlet channel (17) of the air inlet pipe pressure interface (15) is communicated with the main valve upper cavity air-entraining channel (20) in the pilot valve seat (2) through an air inlet damping hole (18) on the pilot valve seat (2); and the area of the air inlet damping hole (18) is smaller than that of the main valve upper cavity air entraining channel (20).
8. A pilot operated safety valve according to claim 1, wherein: the valve cage cavity (10) is communicated with a discharge port (19) formed in the lower valve body (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010895589.1A CN111981168A (en) | 2020-08-31 | 2020-08-31 | Pilot operated safety valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010895589.1A CN111981168A (en) | 2020-08-31 | 2020-08-31 | Pilot operated safety valve |
Publications (1)
| Publication Number | Publication Date |
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| CN111981168A true CN111981168A (en) | 2020-11-24 |
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| CN202010895589.1A Pending CN111981168A (en) | 2020-08-31 | 2020-08-31 | Pilot operated safety valve |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112797221A (en) * | 2021-03-01 | 2021-05-14 | 四川长仪油气集输设备股份有限公司 | Pilot axial flow type safety valve |
| CN112797207A (en) * | 2021-03-01 | 2021-05-14 | 四川长仪油气集输设备股份有限公司 | Pilot-operated pipeline explosion positive and negative action axial flow type self-closing valve |
| CN113090788A (en) * | 2021-05-06 | 2021-07-09 | 徐州八方安全设备有限公司 | Device for automatically controlling pressure relief by system pressure |
| CN113389933A (en) * | 2021-07-29 | 2021-09-14 | 四川长仪油气集输设备股份有限公司 | Multifunctional pilot operated safety valve |
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| JPH1194106A (en) * | 1997-09-25 | 1999-04-09 | Toyooki Kogyo Co Ltd | Pilot operated relief valve |
| CN2427692Y (en) * | 2000-05-27 | 2001-04-25 | 乐山市长江仪表厂 | Piston damping guiding type safety valve |
| CN201202859Y (en) * | 2008-05-08 | 2009-03-04 | 王元清 | Main valve seal structure of high pressure leading safety valve |
| CN203516963U (en) * | 2013-10-31 | 2014-04-02 | 杜青山 | Anti-noise valve core and check valve comprising same |
| CN108644170A (en) * | 2018-06-04 | 2018-10-12 | 中国石油化工股份有限公司 | A kind of adjustable plug-in safety overflow valve of safe pressure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH1194106A (en) * | 1997-09-25 | 1999-04-09 | Toyooki Kogyo Co Ltd | Pilot operated relief valve |
| CN2427692Y (en) * | 2000-05-27 | 2001-04-25 | 乐山市长江仪表厂 | Piston damping guiding type safety valve |
| CN201202859Y (en) * | 2008-05-08 | 2009-03-04 | 王元清 | Main valve seal structure of high pressure leading safety valve |
| CN203516963U (en) * | 2013-10-31 | 2014-04-02 | 杜青山 | Anti-noise valve core and check valve comprising same |
| CN108644170A (en) * | 2018-06-04 | 2018-10-12 | 中国石油化工股份有限公司 | A kind of adjustable plug-in safety overflow valve of safe pressure |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112797221A (en) * | 2021-03-01 | 2021-05-14 | 四川长仪油气集输设备股份有限公司 | Pilot axial flow type safety valve |
| CN112797207A (en) * | 2021-03-01 | 2021-05-14 | 四川长仪油气集输设备股份有限公司 | Pilot-operated pipeline explosion positive and negative action axial flow type self-closing valve |
| CN113090788A (en) * | 2021-05-06 | 2021-07-09 | 徐州八方安全设备有限公司 | Device for automatically controlling pressure relief by system pressure |
| CN113389933A (en) * | 2021-07-29 | 2021-09-14 | 四川长仪油气集输设备股份有限公司 | Multifunctional pilot operated safety valve |
| CN113389933B (en) * | 2021-07-29 | 2022-08-09 | 四川长仪油气集输设备股份有限公司 | Multifunctional pilot operated safety valve |
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