CN111734860B - Pilot operated safety valve with isolation air chamber - Google Patents
Pilot operated safety valve with isolation air chamber Download PDFInfo
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- CN111734860B CN111734860B CN202010797477.2A CN202010797477A CN111734860B CN 111734860 B CN111734860 B CN 111734860B CN 202010797477 A CN202010797477 A CN 202010797477A CN 111734860 B CN111734860 B CN 111734860B
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- 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
- F16K17/04—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
- F16K17/048—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 combined with other safety valves, or with pressure control devices
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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
Abstract
The invention discloses a pilot operated safety valve with an isolation gas chamber, aiming at solving the defects that when the pilot operated safety valve is used, a pilot operated pipeline is easy to corrode and block, the sealing performance of a pilot operated valve and a main valve chamber is influenced, and the service life of the safety valve is shortened. The invention comprises a main valve and a pilot valve, wherein the main valve is provided with a main valve inlet and a main valve outlet, a main valve chamber is arranged in the main valve, the pilot valve comprises a pilot valve body and a pilot valve cover, a medium chamber and an isolation air chamber are arranged in the pilot valve body, a sliding column is arranged between the medium chamber and the isolation air chamber, the upper end of the sliding column is connected with a piston, a spring assembly is connected between the piston and the pilot valve cover, the piston is arranged in the medium chamber in a matching way, a pressure inlet pipe is communicated between the medium chamber and the main valve inlet, the pilot valve body is connected with an air inlet nozzle, a follow-up valve assembly driven by the sliding column is arranged in the isolation air chamber, the follow-up valve assembly divides the isolation air chamber into an air inlet chamber and an air outlet chamber, a pressure connecting pipe is connected between the air inlet chamber and the main valve chamber, and a pressure exhaust pipe is communicated between the air outlet and the main valve outlet.
Description
Technical Field
The present invention relates to a safety valve, and more particularly, to a pilot operated safety valve with an isolation gas chamber.
Background
At present, a pilot operated safety valve is used as a high-end overpressure protection device, and is widely used in occasions with higher requirements on working conditions due to superior performance. Some working conditions of the safety valve contain polymers, precipitates or extremely dirty media, and the media directly enter a pilot valve and a main valve chamber, so that the pilot valve pipeline is easily corroded and blocked, the sealing performance of the pilot valve and the main valve chamber is influenced, and the service life of the safety valve is shortened.
Disclosure of Invention
The invention overcomes the defects that the pilot valve pipeline is easy to corrode and block when the pilot-operated safety valve is used, the sealing performance of the pilot valve and the main valve chamber is influenced, and the service life of the safety valve is shortened, and provides the pilot-operated safety valve with the isolation air chamber.
In order to solve the technical problems, the invention adopts the following technical scheme: a pilot operated safety valve with an isolation air chamber comprises a main valve, a pilot valve, a main valve inlet and a main valve outlet are arranged on the main valve, a main valve chamber is arranged in the main valve, the pilot valve comprises a pilot valve body and a pilot valve cover, a medium chamber and the isolation air chamber are arranged in the pilot valve body, a sliding column is arranged between the medium chamber and the isolation air chamber, the upper end of the sliding column is connected with a piston, a spring assembly is connected between the piston and the pilot valve cover, the piston is installed in the medium chamber in a matched mode, a pressure inlet pipe is connected between the medium chamber and the main valve inlet, an air inlet nozzle used for introducing a stable clean air source into the isolation air chamber is connected to the pilot valve body, a follow-up valve assembly driven by the sliding column is installed in the isolation air chamber, the follow-up valve assembly divides the isolation air chamber into an air inlet chamber and an exhaust chamber, a pressure connecting pipe is connected between the air inlet chamber and the main valve chamber, and the exhaust pipe is connected between the exhaust chamber and the main valve outlet; in the initial state, the air inlet chamber is isolated from the air exhaust chamber, and the air inlet nozzle is communicated with the air inlet chamber; the sliding column drives the follow-up valve component to move so that the air inlet chamber is communicated with the air outlet chamber, and the air inlet nozzle is isolated from the air inlet chamber.
When the pilot operated safety valve works, a medium enters the inlet of the main valve and is injected into the medium cavity through the pressure inlet pipe, and a stable and clean air source enters the isolation air chamber through the air inlet nozzle and is injected into the main valve cavity from the air inlet chamber and the pressure connecting pipe. When the medium is over-pressurized, the pressure in the medium cavity is increased, the piston is pushed upwards, so that the sliding column is driven to move upwards, the sliding column drives the follow-up valve component to move, the air inlet chamber is communicated with the air outlet chamber, the air inlet nozzle is isolated from the air inlet chamber, at the moment, the gas in the main valve cavity is discharged outwards through the air inlet chamber, the air outlet chamber and the exhaust pipe, the pressure in the main valve cavity is reduced, and the main valve is opened to release the pressure. After pressure relief is completed, pressure in the medium cavity is reduced, the piston returns to drive the sliding column to return, the sliding column drives the follow-up valve assembly to return, the follow-up valve assembly returns to the initial state, the air inlet chamber is isolated from the exhaust chamber, the air inlet nozzle is communicated with the air inlet chamber, a stable clean air source enters the isolation air chamber through the air inlet nozzle and is injected into the main valve cavity from the air inlet chamber and the through pressure pipe, and the main valve is closed. The pilot operated safety valve with the isolation air chamber introduces a stable clean air source into the pilot valve and the main valve chamber, does not corrode and block the pilot valve pipeline, ensures the sealing performance of the pilot valve and the main valve chamber, and is beneficial to prolonging the service life of the safety valve. The pressure of the clean air source is equivalent to the setting pressure of the main valve, and the clean air source is stable and can keep the sealing performance of the main valve.
Preferably, the pilot valve body comprises an upper mounting seat and a lower mounting seat, the medium cavity is arranged in the upper mounting seat, the sliding column is mounted between the upper mounting seat and the lower mounting seat, the upper mounting seat is provided with a medium channel communicated with the lower end of the medium cavity, the lower mounting seat is correspondingly provided with a medium inlet hole corresponding to the medium channel, the medium inlet hole is communicated with the medium channel, and the pressure inlet pipe is communicated with the medium inlet hole.
The upper mounting seat and the lower mounting seat are connected together to form the pilot valve body, so that the pilot valve is convenient to assemble. The medium channel and the medium inlet hole are arranged to facilitate the medium to be injected into the medium cavity.
Preferably, the servo valve assembly comprises a valve core and a connecting seat, the valve core is of a tubular structure, the lower end of the sliding column is provided with a mounting hole, the upper end of the valve core is arranged in the mounting hole, the connecting seat is fixedly connected to the lower end of the sliding column, an overflowing gap is arranged between the inner wall of the connecting seat and the outer wall of the valve core, and a through pipe and a radial through hole of the overflowing gap are communicated with the connecting seat; a limiting boss is arranged at the upper end of the valve core, an upper sealing ring is sleeved on the outer wall of the valve core at a position close to the lower part of the limiting boss, and a reserved space is arranged between the upper end of the connecting seat and the upper sealing ring; the lower end of the isolation air chamber is provided with a fixed seat, the fixed seat is provided with a sleeving hole, the lower end of the valve core is connected in the sleeving hole, an exhaust chamber is formed between the outer wall of the fixed seat and the inner wall of the isolation air chamber, a flow through groove is arranged on the outer wall of the valve core and corresponds to the exhaust chamber, the fixed seat is provided with a radial hole for communicating the flow through groove and the exhaust chamber, the lower part of the valve core is sleeved with a middle sealing ring and a lower sealing ring, the middle sealing ring is tightly arranged at an opening position at the upper end of the sleeving hole to isolate the air inlet chamber from the exhaust chamber, and the lower sealing ring is tightly sleeved on the inner wall of the sleeving hole; the connecting seat moves upwards along with the sliding column and abuts against the upper sealing ring and pushes the valve core to move upwards together, and an abutting spring is arranged between the upper end of the valve core and the sliding column.
In the upward movement process of the sliding column, the connecting seat is firstly abutted to the upper sealing ring to isolate the air inlet nozzle from the air inlet chamber, the sliding column continuously moves upward, the valve core is driven upward, the middle sealing ring is separated from the sleeving hole, the air inlet chamber is communicated with the exhaust chamber, the gas in the cavity of the main valve is discharged outwards through the exhaust pipe, and the main valve is opened. The sliding column moves downwards to return, and the valve core returns to the initial state under the action of the abutting spring. The reserved space is arranged between the upper end of the connecting seat and the upper sealing ring, the connecting seat moves upwards for a certain distance before pushing the valve core, the valve core is fixed in the process, and the situation that the main valve is mistakenly opened when medium is instantaneously over-pressurized is avoided.
Preferably, the fixed seat is of a T-shaped structure, the sleeving hole is of a T-shaped structure, the lower portion of the valve core is arranged on the small-diameter portion of the sleeving hole, the lower portion of the connecting seat is sleeved on the large-diameter portion of the sleeving hole, and the positioning spring is arranged between the sliding column and the fixed seat. The fixing seat is convenient and reliable to install. The arrangement of the positioning spring is convenient for the sliding column to slide up and down.
Preferably, the connecting seat comprises a connecting part and a positioning part, the connecting part is tightly connected in the mounting hole, and the upper end surface of the positioning part abuts against the lower end surface of the sliding column; the radial through hole is arranged on the positioning part; the inner edge of the upper end of the connecting part is provided with an annular gap groove; the valve core outer wall and the connecting portion corresponding position are provided with grooves, the inner wall of the connecting portion is matched with the outer wall of the valve core, and the inner diameter of the connecting portion is smaller than that of the positioning portion. The connecting seat is closely and reliably connected with the lower end of the sliding column, and the notch groove is convenient to be matched with the upper sealing ring, so that the sealing effect is improved. The arrangement of the groove is convenient for the circulation of an air source.
Preferably, the spring assembly comprises a setting spring, an upper spring seat, a lower spring seat and an adjusting screw rod, the setting spring is abutted between the upper spring seat and the lower spring seat, the adjusting screw rod is in threaded connection with the pilot valve cover, the lower end of the adjusting screw rod is abutted on the upper spring seat, and the lower spring seat is abutted on the upper end of the sliding column. The spring assembly has simple structure and stable and reliable operation.
Preferably, a guide sleeve and a valve seat are installed in the main valve, a valve clack is installed in the guide sleeve in a matched mode, an annular groove is formed in the outer wall of the valve clack, the valve seat is installed at the position of an inlet of the main valve, a pre-tightening spring is installed in a cavity of the main valve, the pre-tightening spring abuts against the valve clack, and the valve clack abuts against the valve seat. The pre-tightening spring applies pre-tightening force to the valve clack, and the valve clack moves stably and reliably in the guide sleeve without deflection.
Preferably, the rotatable partition plate is mounted on the limiting boss, a plurality of upper through holes are uniformly distributed on the partition plate, a plurality of lower through holes are correspondingly arranged on the limiting boss and the upper through holes one by one, the outer wall of the partition plate is hermetically connected with the inner wall of the mounting hole, an upward extending guide plate is arranged on the partition plate, a guide groove which is obliquely arranged is arranged on the guide plate, guide posts are correspondingly arranged in the mounting hole and the guide groove, and the guide posts are inserted in the guide groove; the partition plate moves upwards along with the valve core, the guide groove slides upwards through the guide pillar so as to push the partition plate to rotate, so that the upper through hole and the lower through hole are staggered, and the partition plate covers the lower through hole in a sealing manner; the partition board returns downwards along with the valve core, and the guide groove slides downwards to pass through the guide pillar so as to push the partition board to rotate reversely, so that the upper through hole and the lower through hole are aligned and communicated.
The through-hole corresponds the intercommunication down with the through-hole under the initial condition, guarantees suction nozzle and air inlet chamber intercommunication, and after the connecting seat rebound supported the upper seal circle, suction nozzle and air inlet chamber were kept apart, and when the connecting seat promoted the case rebound, thereby the guide slot upwards slided the guide pillar and promoted the baffle rotation and make the through-hole stagger down with the through-hole, and the baffle will be down the sealed lid of through-hole and close, further keep apart suction nozzle and air inlet chamber, improve the sealed effect of isolation. The partition board returns downwards along with the valve core, and the guide groove slides downwards to pass through the guide pillar so as to push the partition board to rotate reversely, so that the upper through hole and the lower through hole are aligned and communicated.
Preferably, a supporting convex ring is arranged on the upper end face of the limiting convex ring, the partition plate is sleeved on the outer wall of the supporting convex ring, the upper end of the supporting convex ring is connected with a cover ring, and the inner edge of the upper end of the partition plate is covered by the cover ring. This arrangement ensures reliable installation of the partition.
Compared with the prior art, the invention has the beneficial effects that: (1) the pilot operated safety valve with the isolation air chamber leads a stable clean air source into the pilot valve and the main valve chamber, so that the phenomena of corrosion and blockage of a pilot valve pipeline are avoided, the sealing performance of the pilot valve and the main valve chamber is ensured, and the service life of the safety valve is prolonged; (2) when the main valve is opened, the air inlet nozzle and the air inlet chamber are good in isolation and sealing effect, on one hand, waste of a clean air source is avoided, and on the other hand, reliable opening of the main valve is guaranteed.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is a partially enlarged schematic view of a pilot valve in a main valve closed state according to embodiment 1 of the present invention;
fig. 3 is a partially enlarged schematic view of a pilot valve in a main valve open state according to embodiment 1 of the present invention;
FIG. 4 is a partially enlarged schematic view of embodiment 2 of the present invention;
FIG. 5 is a schematic structural view of a separator according to example 2 of the present invention;
in the figure: 1. a main valve, 2, a pilot valve, 3, a main valve inlet, 4, a main valve outlet, 5, a main valve chamber, 6, a guide sleeve, 7, a valve seat, 8, a valve clack, 9, a ring groove, 10, a pretension spring, 11, a pilot valve body, 12, a pilot valve cover, 13, a medium cavity, 14, a sliding column, 15, a piston, 16, a pressure inlet pipe, 17, an air inlet nozzle, 18, a follow-up valve component, 19, an air inlet chamber, 20, an exhaust chamber, 21, a pressure through pipe, 22, a pressure discharge pipe, 23, an upper mounting seat, 24, a lower mounting seat, 25, a medium channel, 26, a medium inlet hole, 27, a sealing sleeve, 28, a valve core, 29, a connecting seat, 30, a mounting hole, 31, a flow passage gap, 32, a radial through hole, 33, a limit boss, 34, an upper sealing ring, 35, a reserved space, 36, a fixing seat, 37, a sleeving hole, 38, a flow passage groove, 39, a radial hole, 40, a middle sealing ring, 41, a lower sealing ring, 42. the device comprises an abutting spring 43, a connecting part 44, a positioning part 45, a notch groove 46, a groove 47, an extension sleeve 48, a limiting flange 49, a setting spring 50, an upper spring seat 51, a lower spring seat 52, an adjusting screw 53, an exhaust nozzle 54, a partition plate 55, an upper through hole 56, a lower through hole 57, a guide plate 58, a guide groove 59, a guide post 60, a supporting convex ring 61 and a cover ring.
Detailed Description
The technical scheme of the invention is further described in detail by the following specific embodiments in combination with the attached drawings:
example 1: a pilot operated safety valve with an isolation air chamber (see attached figures 1 to 3) comprises a main valve 1, a pilot valve 2, a main valve inlet 3 and a main valve outlet 4 which are arranged on the main valve, a main valve chamber 5 is arranged in the main valve, a guide sleeve 6 and a valve seat 7 are arranged in the main valve, the main valve chamber is arranged in the guide sleeve, a valve clack 8 is arranged in the guide sleeve in a matching way, an annular groove 9 is arranged on the outer wall of the valve clack, the valve seat is arranged at the inlet position of the main valve, a pre-tightening spring 10 is arranged in the main valve chamber, the pre-tightening spring is abutted to the valve clack, and the valve clack is abutted to the valve seat.
The pilot valve comprises a pilot valve body 11 and a pilot valve cover 12, a medium cavity 13 and an isolation air chamber are arranged in the pilot valve body, a sliding column 14 is arranged between the medium cavity and the isolation air chamber, the upper end of the sliding column is connected with a piston 15, a spring assembly is connected between the piston and the pilot valve cover, the piston is installed in the medium cavity in a matching mode, an inlet pipe 16 is communicated between the medium cavity and the inlet of the main valve, an inlet nozzle 17 used for introducing a stable clean air source into the isolation air chamber is connected to the pilot valve body, a servo valve assembly 18 driven by the sliding column is installed in the isolation air chamber, the servo valve assembly divides the isolation air chamber into an inlet chamber 19 and an outlet chamber 20, a connecting pipe 21 is connected between the inlet chamber and the main valve chamber, and an outlet pipe 22 is communicated between the outlet chamber and the main valve; in the initial state, the air inlet chamber is isolated from the air exhaust chamber, and the air inlet nozzle is communicated with the air inlet chamber; the sliding column drives the follow-up valve component to move so that the air inlet chamber is communicated with the air outlet chamber, and the air inlet nozzle is isolated from the air inlet chamber.
The pilot valve body comprises an upper mounting seat 23 and a lower mounting seat 24, a medium cavity is arranged in the upper mounting seat, a sliding column is arranged between the upper mounting seat and the lower mounting seat, a medium channel 25 communicated with the lower end of the medium cavity is arranged on the upper mounting seat, a medium inlet hole 26 is correspondingly arranged on the lower mounting seat and the medium channel, the medium inlet hole is communicated with the medium channel, and a pressure inlet pipe is communicated with the medium inlet hole. A sealing sleeve 27 is tightly connected between the medium channel and the medium inlet hole.
The servo valve assembly comprises a valve core 28 and a connecting seat 29, wherein the valve core is of a tubular structure, the lower end of a sliding column is provided with a mounting hole 30, the upper end of the valve core is arranged in the mounting hole, the connecting seat is fixedly connected to the lower end of the sliding column, an overflowing gap 31 is arranged between the inner wall of the connecting seat and the outer wall of the valve core, and a through pipe and a radial through hole 32 of the overflowing gap are communicated with the connecting seat; a limiting boss 33 is arranged at the upper end of the valve core, an upper sealing ring 34 is sleeved on the outer wall of the valve core at a position close to the lower part of the limiting boss, and a reserved space 35 is arranged between the upper end of the connecting seat and the upper sealing ring; the lower end of the isolation air chamber is provided with a fixed seat 36, the fixed seat is provided with a sleeving hole 37, the lower end of the valve core is connected in the sleeving hole, an exhaust chamber is formed between the outer wall of the fixed seat and the inner wall of the isolation air chamber, a through flow groove 38 is arranged on the outer wall of the valve core and corresponds to the exhaust chamber, the fixed seat is provided with a radial hole 39 for communicating the through flow groove and the exhaust chamber, the lower part of the valve core is sleeved with a middle sealing ring 40 and a lower sealing ring 41, the middle sealing ring is tightly arranged at the opening position of the upper end of the sleeving hole to isolate the air inlet chamber from the exhaust chamber, and the lower sealing ring is tightly sleeved on the inner wall of the sleeving hole; the connecting seat moves upwards along with the sliding column and abuts against the upper sealing ring and pushes the valve core to move upwards together.
The fixing seat is of a T-shaped structure, the sleeving hole is of a T-shaped structure, the lower portion of the valve core is arranged on the small-diameter portion of the sleeving hole, the lower portion of the connecting seat is sleeved on the large-diameter portion of the sleeving hole, the positioning spring is installed between the sliding column and the fixing seat, and the abutting spring 42 is installed between the upper end of the valve core and the sliding column. The connecting seat comprises a connecting part 43 and a positioning part 44, the connecting part is tightly connected in the mounting hole, and the upper end surface of the positioning part is abutted against the lower end surface of the sliding column; the radial through hole is arranged on the positioning part; the inner edge of the upper end of the connecting part is provided with an annular gap groove 45; the position on the outer wall of the valve core corresponding to the connecting part is provided with a groove 46, the inner wall of the connecting part is matched with the outer wall of the valve core, and the inner diameter of the connecting part is smaller than that of the positioning part.
The medium chamber is T-shaped structure, the piston is installed in the big-diameter hole of the medium chamber, the sliding column is installed in the small-diameter hole of the medium chamber, the lower end of the upper installation seat is provided with an extension sleeve 47, the extension sleeve is installed at the upper end of the isolation air chamber in an adaptive mode, the outer wall of the lower portion of the sliding column is provided with a limiting flange 48, and the limiting flange can abut against the lower end of the extension sleeve.
The spring assembly comprises a setting spring 49, an upper spring seat 50, a lower spring seat 51 and an adjusting screw rod 52, wherein the setting spring is abutted between the upper spring seat and the lower spring seat, the adjusting screw rod is in threaded connection with the pilot valve cover, the lower end of the adjusting screw rod is abutted on the upper spring seat, and the lower spring seat is abutted on the upper end of the sliding column. The pilot valve cover is provided with an exhaust nozzle 53. The exhaust nozzle plays a role in balancing air pressure in the pilot valve cover.
When the pilot operated safety valve works, a medium enters the inlet of the main valve and is injected into the medium cavity through the pressure inlet pipe, and a stable and clean air source enters the isolation air chamber through the air inlet nozzle and is injected into the main valve cavity from the air inlet chamber and the pressure connecting pipe. When the medium is over-pressurized, the pressure in the medium cavity is increased, the piston is pushed upwards, so that the sliding column is driven to move upwards, the sliding column drives the follow-up valve component to move, the air inlet chamber is communicated with the air outlet chamber, the air inlet nozzle is isolated from the air inlet chamber, at the moment, the gas in the main valve cavity is discharged outwards through the air inlet chamber, the air outlet chamber and the exhaust pipe, the pressure in the main valve cavity is reduced, and the main valve is opened to release the pressure. After pressure relief is completed, pressure in the medium cavity is reduced, the piston returns to drive the sliding column to return, the sliding column drives the follow-up valve assembly to return, the follow-up valve assembly returns to the initial state, the air inlet chamber is isolated from the exhaust chamber, the air inlet nozzle is communicated with the air inlet chamber, a stable clean air source enters the isolation air chamber through the air inlet nozzle and is injected into the main valve cavity from the air inlet chamber and the through pressure pipe, and the main valve is closed. The pilot operated safety valve with the isolation air chamber introduces a stable clean air source into the pilot valve and the main valve chamber, does not corrode and block the pilot valve pipeline, ensures the sealing performance of the pilot valve and the main valve chamber, and is beneficial to prolonging the service life of the safety valve. The pressure of the clean air source is equivalent to the setting pressure of the main valve, and the clean air source is stable and can keep the sealing performance of the main valve.
Example 2: a pilot operated safety valve with an isolation air chamber (see attached figures 4 and 5) is similar to the structure of embodiment 1, and mainly has the difference that a rotatable partition plate 54 is installed on a limiting boss in the embodiment, a plurality of upper through holes 55 are uniformly distributed on the partition plate, a plurality of lower through holes 56 are correspondingly arranged on the limiting boss and the upper through holes one by one, the outer wall of the partition plate is hermetically connected with the inner wall of an installation hole, two guide plates 57 extending upwards are arranged on the partition plate, the two guide plates are uniformly distributed and are arc-shaped, guide grooves 58 are obliquely arranged on the guide plates, guide posts 59 are correspondingly arranged in the installation hole and the guide grooves, and the guide posts are inserted in the guide grooves; the partition plate moves upwards along with the valve core, the guide groove slides upwards through the guide pillar so as to push the partition plate to rotate, so that the upper through hole and the lower through hole are staggered, and the partition plate covers the lower through hole in a sealing manner; the partition board returns downwards along with the valve core, and the guide groove slides downwards to pass through the guide pillar so as to push the partition board to rotate reversely, so that the upper through hole and the lower through hole are aligned and communicated. The upper end face of the limiting convex ring is provided with a supporting convex ring 60, the partition plate is sleeved on the outer wall of the supporting convex ring, the upper end of the supporting convex ring is connected with a cover ring 61, and the cover ring covers the inner edge of the upper end of the partition plate. The guide groove extends to the upper end of the guide plate to form an opening. The other structure is the same as embodiment 1.
The through-hole corresponds the intercommunication down with the through-hole under the initial condition, guarantees suction nozzle and air inlet chamber intercommunication, and after the connecting seat rebound supported the upper seal circle, suction nozzle and air inlet chamber were kept apart, and when the connecting seat promoted the case rebound, thereby the guide slot upwards slided the guide pillar and promoted the baffle rotation and make the through-hole stagger down with the through-hole, and the baffle will be down the sealed lid of through-hole and close, further keep apart suction nozzle and air inlet chamber, improve the sealed effect of isolation. The partition board returns downwards along with the valve core, and the guide groove slides downwards to pass through the guide pillar so as to push the partition board to rotate reversely, so that the upper through hole and the lower through hole are aligned and communicated. When the main valve is opened, the air inlet nozzle and the air inlet chamber are good in isolation and sealing effect, on one hand, waste of a clean air source is avoided, and on the other hand, reliable opening of the main valve is guaranteed.
The above-described embodiments are merely preferred embodiments of the present invention, which is not intended to be limiting in any way, and other variations and modifications are possible without departing from the scope of the invention as set forth in the appended claims.
Claims (8)
1. A pilot operated safety valve with an isolation air chamber comprises a main valve, a pilot valve, a main valve inlet and a main valve outlet are arranged on the main valve, and a main valve chamber is arranged in the main valve; in the initial state, the air inlet chamber is isolated from the air exhaust chamber, and the air inlet nozzle is communicated with the air inlet chamber; the sliding column drives the follow-up valve component to move so that the air inlet chamber is communicated with the exhaust chamber, and the air inlet nozzle is isolated from the air inlet chamber; the servo valve assembly comprises a valve core and a connecting seat, the valve core is of a tubular structure, the lower end of a sliding column is provided with a mounting hole, the upper end of the valve core is arranged in the mounting hole, the connecting seat is fixedly connected to the lower end of the sliding column, an overflowing gap is arranged between the inner wall of the connecting seat and the outer wall of the valve core, and a radial through hole for communicating a pressure pipe and the overflowing gap is formed in the connecting seat; a limiting boss is arranged at the upper end of the valve core, an upper sealing ring is sleeved on the outer wall of the valve core at a position close to the lower part of the limiting boss, and a reserved space is arranged between the upper end of the connecting seat and the upper sealing ring; the lower end of the isolation air chamber is provided with a fixed seat, the fixed seat is provided with a sleeving hole, the lower end of the valve core is connected in the sleeving hole, an exhaust chamber is formed between the outer wall of the fixed seat and the inner wall of the isolation air chamber, a flow through groove is arranged on the outer wall of the valve core and corresponds to the exhaust chamber, the fixed seat is provided with a radial hole for communicating the flow through groove and the exhaust chamber, the lower part of the valve core is sleeved with a middle sealing ring and a lower sealing ring, the middle sealing ring is tightly arranged at an opening position at the upper end of the sleeving hole to isolate the air inlet chamber from the exhaust chamber, and the lower sealing ring is tightly sleeved on the inner wall of the sleeving hole; the connecting seat moves upwards along with the sliding column and abuts against the upper sealing ring and pushes the valve core to move upwards together, and an abutting spring is arranged between the upper end of the valve core and the sliding column.
2. The pilot operated safety valve with the isolating gas chamber as claimed in claim 1, wherein the pilot valve body comprises an upper mounting seat and a lower mounting seat, the medium chamber is arranged in the upper mounting seat, the sliding column is mounted between the upper mounting seat and the lower mounting seat, the upper mounting seat is provided with a medium passage communicated with the lower end of the medium chamber, the lower mounting seat is provided with a medium inlet corresponding to the medium passage, the medium inlet is communicated with the medium passage, and the pressure inlet pipe is communicated with the medium inlet.
3. The pilot operated safety valve with an isolated air chamber of claim 1, wherein the fixing seat is T-shaped, the sleeve hole is T-shaped, the lower portion of the valve core is disposed at the small diameter portion of the sleeve hole, the lower portion of the connecting seat is sleeved at the large diameter portion of the sleeve hole, and a positioning spring is installed between the spool and the fixing seat.
4. The pilot operated safety valve with the isolation air chamber as claimed in claim 1, wherein the connecting seat comprises a connecting part and a positioning part, the connecting part is tightly connected in the mounting hole, and the upper end surface of the positioning part abuts against the lower end surface of the spool; the radial through hole is arranged on the positioning part; the inner edge of the upper end of the connecting part is provided with an annular gap groove; the valve core outer wall and the connecting portion corresponding position are provided with grooves, the inner wall of the connecting portion is matched with the outer wall of the valve core, and the inner diameter of the connecting portion is smaller than that of the positioning portion.
5. The pilot operated safety valve with an isolated gas chamber as claimed in any one of claims 1 to 4, wherein the spring assembly comprises a setting spring, an upper spring seat, a lower spring seat, and an adjusting screw, the setting spring abuts between the upper spring seat and the lower spring seat, the adjusting screw is screwed on the pilot valve cover, the lower end of the adjusting screw abuts on the upper spring seat, and the lower spring seat abuts on the upper end of the spool.
6. The pilot operated safety valve with an isolating air chamber as claimed in any one of claims 1 to 4, wherein a guide sleeve and a valve seat are installed in the main valve, a valve flap is installed in the guide sleeve, an annular groove is formed in the outer wall of the valve flap, the valve seat is installed at the inlet position of the main valve, a pre-tightening spring is installed in the main valve chamber, the pre-tightening spring abuts against the valve flap, and the valve flap abuts against the valve seat.
7. The pilot operated safety valve with the isolating air chamber as claimed in claim 1, wherein the limiting boss is provided with a rotatable partition plate, a plurality of upper through holes are uniformly distributed on the partition plate, a plurality of lower through holes are correspondingly arranged on the limiting boss and the upper through holes one by one, the outer wall of the partition plate is hermetically connected with the inner wall of the mounting hole, an upwardly extending guide plate is arranged on the partition plate, a guide groove is obliquely arranged on the guide plate, a guide post is arranged in the mounting hole and corresponds to the guide groove, and the guide post is inserted into the guide groove; the partition plate moves upwards along with the valve core, the guide groove slides upwards through the guide pillar so as to push the partition plate to rotate, so that the upper through hole and the lower through hole are staggered, and the partition plate covers the lower through hole in a sealing manner; the partition board returns downwards along with the valve core, and the guide groove slides downwards to pass through the guide pillar so as to push the partition board to rotate reversely, so that the upper through hole and the lower through hole are aligned and communicated.
8. The pilot operated safety valve with the isolating air chamber as claimed in claim 7, wherein the upper end face of the limit protruding ring is provided with a support protruding ring, the partition plate is sleeved on the outer wall of the support protruding ring, the upper end of the support protruding ring is connected with the cover ring, and the cover ring covers the inner edge of the upper end of the partition plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010797477.2A CN111734860B (en) | 2020-08-10 | 2020-08-10 | Pilot operated safety valve with isolation air chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010797477.2A CN111734860B (en) | 2020-08-10 | 2020-08-10 | Pilot operated safety valve with isolation air chamber |
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| Publication Number | Publication Date |
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| CN111734860A CN111734860A (en) | 2020-10-02 |
| CN111734860B true CN111734860B (en) | 2022-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010797477.2A Active CN111734860B (en) | 2020-08-10 | 2020-08-10 | Pilot operated safety valve with isolation air chamber |
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Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4791955A (en) * | 1983-09-22 | 1988-12-20 | Dresser Industries, Inc. | Modulating pressure operated pilot relief valve |
| CN201228793Y (en) * | 2008-07-16 | 2009-04-29 | 宁波星箭航天机械厂 | High-pressure high flow rate pressure reducing valve |
| CN201373150Y (en) * | 2009-01-15 | 2009-12-30 | 吴江市东吴机械有限责任公司 | Pilot operated safety valve |
| CN101963251B (en) * | 2010-09-30 | 2012-07-11 | 北京航天动力研究所 | Pilot-operated safety valve with modulation characteristic |
| CN104514901B (en) * | 2013-09-29 | 2017-07-18 | 北京航天石化技术装备工程有限公司 | A kind of plastic seal pilot operated safety valve |
| CN104358917B (en) * | 2014-11-05 | 2017-03-01 | 北京航天石化技术装备工程有限公司 | The pilot operated safety valve controlling with individual gas sources |
| CN105864496B (en) * | 2016-05-27 | 2018-01-30 | 永一阀门集团有限公司 | Backpressure regulation pilot operated safety valve |
| CN206036322U (en) * | 2016-08-30 | 2017-03-22 | 罗浮阀门集团有限公司 | Modulation system guide relief valve |
| CN107300027B (en) * | 2017-07-12 | 2023-06-13 | 北京航天石化技术装备工程有限公司 | Pilot-operated safety valve for high-temperature working condition |
| CN110848432B (en) * | 2019-12-13 | 2024-02-02 | 罗浮阀门集团有限公司 | Back pressure bursting prevention type pilot valve structure |
-
2020
- 2020-08-10 CN CN202010797477.2A patent/CN111734860B/en active Active
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