CN210372182U

CN210372182U - High-temperature and high-pressure resistant pilot operated safety valve

Info

Publication number: CN210372182U
Application number: CN201921329268.4U
Authority: CN
Inventors: 张秀林; 张健熙; 张希; 朱鹏飞; 董丰
Original assignee: Henghua Valve Co ltd
Current assignee: Henghua Valve Co ltd
Priority date: 2019-08-16
Filing date: 2019-08-16
Publication date: 2020-04-21
Anticipated expiration: 2029-08-16

Abstract

The utility model relates to a high temperature resistant and highly compressed pilot operated relief valve. The problem that the existing pilot operated safety valve cannot be used in high-temperature and high-pressure occasions is mainly solved. The method is characterized in that: the outer wall of the main valve clack (102) is provided with a piston ring (107), a one-way check valve (5) is arranged in the valve plate (108), the middle of the upper guide pipe (4) is connected with a two-way check valve (6), the sealing surface of the pilot valve clack (202) corresponding to the pilot valve seat (205) is a metal hard sealing surface, and the sealing surface of the lower end of the sliding valve (203) corresponding to the pilot valve seat (205) is a metal hard sealing surface. The utility model discloses a main valve and pilot valve have structurally improved, have increased one-way check valve and two-way check valve, adopt the piston ring between main valve clack and the cylinder liner, have all removed O shape sealing washer in main valve and the pilot valve, can use in the highly compressed occasion of high temperature, have that the flow resistance is little, the discharge capacity is big, sealed specific pressure is big, sealing performance is good and can be able to bear or endure the characteristics of higher backpressure.

Description

High-temperature and high-pressure resistant pilot operated safety valve

Technical Field

The utility model relates to a valve, concretely relates to high temperature resistant and highly compressed guide's formula relief valve.

Background

The pilot operated safety valve is a non-direct load type safety valve, and is suitable for high-pressure and large-caliber occasions. The pilot safety valve mainly consists of a main valve (also called a mother valve) and a pilot valve (also called a sub valve), when the medium pressure is less than a set value, the system is in a normal operation state, a slide valve in a pilot valve cavity is in an opening state, pressure medium is transmitted into a gas chamber above a valve clack (piston) of the main valve from an inlet of the main valve through a lower guide pipe, the pilot valve cavity and an upper guide pipe, the gas pressure of the upper gas chamber is the same as that of the inlet of the main valve, and at the moment, a sealing surface of the pilot valve is in a sealing state, so that the gas in the gas chamber above. Because the area difference exists in the pressure area of the upper and lower end faces of the main valve clack (piston), the pressure medium produces a downward resultant force to the main valve clack (piston), so that the main valve is in a closed and sealed state. When the pressure medium rises to reach a setting pressure, gas jacks up a valve core of the pilot valve at the sealing surface of the pilot valve, the pilot valve is firstly opened, so that the valve core of the pilot valve is in an opening state, and meanwhile, a slide valve in a valve cavity of the pilot valve moves upwards to seal a gas passing channel of the valve cavity of the pilot valve; the medium in the air chamber above the main valve clack is exhausted via the valve core opening part of the pilot valve to lower the pressure in the main valve clack, and the main valve clack is opened under the push of the inlet pressure to release the pressure in the system. When the pressure medium is reduced to a certain value, the valve core of the pilot valve returns to the seat downwards under the action of the spring, the valve core of the pilot valve is closed, the slide valve of the valve cavity of the pilot valve is opened, the valve cavity is unblocked, and the pressure medium is transmitted into the air chamber above the valve clack of the main valve through the valve cavity of the pilot valve again and pushes the valve clack of the main valve to close.

The prior pilot operated safety valve has the following technical defects: because of the structure of the main valve and the pilot valve, the main valve clack and the cylinder sleeve are positioned at the outlet side of the main valve body, the main valve clack and the cylinder sleeve have better sealing performance, an O-shaped sealing ring is used for sealing between the main valve clack and the cylinder sleeve at present, a movable part on the pilot valve is also sealed by the O-shaped sealing ring, the O-shaped sealing ring has limited high-temperature and high-pressure resistance, and the conventional fluororubber O-shaped sealing ring has the highest resistance of below 300 ℃. Under the impact of high-temperature and high-pressure media, the O-shaped sealing ring is easy to damage, cannot seal and forms leakage, so that the conventional pilot operated safety valve cannot be used in high-temperature and high-pressure occasions.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that current pilot operated relief valve can not use in the highly compressed occasion of high temperature, the utility model provides a high temperature resistant and highly compressed pilot operated relief valve, the main valve and the pilot valve of this high temperature resistant and highly compressed pilot operated relief valve structurally improve, one-way check valve and two-way check valve have been increased, adopt the piston ring between main valve clack and the cylinder liner, O shape sealing washer has all been removed in main valve and the pilot valve, can use in the highly compressed occasion of high temperature, it is little to have the flow resistance, the discharge capacity is big, it is big to seal the specific pressure, sealing performance is good and can be able to bear or endure the characteristics of.

The technical scheme of the utility model is that: a high-temp and-pressure resistant pilot-operated safety valve is composed of a main valve consisting of main valve body with main valve inlet and outlet, main valve clack in the cylinder sleeve and able to slide in it, cylinder sleeve, and main valve seat with pilot valve cavity, pilot valve inlet communicated with main valve inlet via lower guide tube, pilot valve cavity communicated with main valve outlet via upper guide tube, piston ring installed to main valve clack, valve plate, a seat return spring is arranged between the valve plate and the main valve clack, a back pressure cavity is formed by a space enclosed by the cylinder sleeve, the valve plate and the main valve clack, a one-way check valve is arranged in the valve plate, an inlet of the main valve is communicated with the back pressure cavity through the one-way check valve, a two-way check valve is connected in the middle of the upper guide pipe and comprises a two-way check valve body and a two-way slide valve, the two-way slide valve is positioned in the two-way check valve body and can slide left and right, the left end of the two-way check valve body is communicated with the pilot valve cavity, the right end of the two-way check valve body is communicated with an outlet of the main valve; the sealing surface of the valve clack of the guide valve corresponding to the valve seat of the guide valve is a metal hard sealing surface, and the sealing surface of the lower end of the slide valve corresponding to the valve seat of the guide valve is a metal hard sealing surface.

The pilot valve body is of an upper and lower split structure, and the pilot valve seat is clamped in the middle of the pilot valve body and sealed through a high-temperature and high-pressure resistant gasket.

And a small spring is arranged between the lower end of the slide valve and the valve body of the pilot valve.

And a filter is arranged between the lower guide pipe and the main valve body.

The side wall of the bidirectional slide valve is provided with a groove along the axial direction.

And the two ends of the two-way sliding valve and the sealing surfaces corresponding to the two ends of the two-way check valve body are both metal hard sealing surfaces.

The utility model discloses following beneficial effect has: owing to take above-mentioned technical scheme, the utility model discloses an adopt the piston ring between main valve clack and the cylinder liner, all removed O shape sealing washer in main valve and the pilot valve, can use in the highly compressed occasion of high temperature, have that the flow resistance is little, the discharge capacity is big, sealed specific pressure is big, sealing performance is good and can be able to bear or endure the characteristics of higher backpressure. The pilot valve has large flow and sensitive action, the upper sealing surface and the lower sealing surface are both metal hard seals, and the one-way check valve and the two-way check valve are arranged, so that the air inlet and the air outlet in the back pressure cavity are faster, the action of the main valve is more sensitive, and the purpose of fast opening and fast closing is achieved.

Drawings

Fig. 1 is a structural sectional view of the present invention.

Fig. 2 is a structural sectional view of the main valve 1 of fig. 1.

Fig. 3 is a structural sectional view of the pilot valve 2 in fig. 1.

Fig. 4 is a structural sectional view of the two-way check valve 6 of fig. 1.

In the figure 1-main valve, 101-main valve body, 102-main valve flap, 103-cylinder liner, 104-main valve seat, 105-main valve inlet, 106-main valve outlet, 107-piston ring, 108-valve plate, 109-recoil spring, 110-backpressure chamber, 2-pilot valve, 201-pilot valve body, 202-pilot valve flap, 203-pilot valve, 204-pilot valve chamber, 205-pilot valve seat, 206-small spring, 207-high temperature and high pressure resistant gasket, 208-pilot valve inlet, 3-down-guide, 4-up-guide, 5-one-way check valve, 6-two-way check valve, 61-two-way check valve body, 62-two-way pilot valve, 63-annular chamber, 64-groove, 7-filter.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

as shown in fig. 1 to 4, a high temperature and high pressure resistant pilot operated safety valve comprises a main valve 1 and a pilot valve 2, wherein the main valve 1 comprises a main valve body 101, a main valve flap 102, a cylinder sleeve 103 and a main valve seat 104, the main valve body 101 is provided with a main valve inlet 105 and a main valve outlet 106, the main valve flap 102 is positioned in the cylinder sleeve 103 and can slide in the cylinder sleeve 103, the main valve flap 102 corresponds to the main valve seat 104, the pilot valve 2 comprises a pilot valve body 201, a pilot valve flap 202, a pilot valve 203 and a pilot valve seat 205, the pilot valve seat 205 is provided with a pilot valve cavity 204, the pilot valve 203 penetrates through the pilot valve cavity 204, the upper end of the pilot valve 203 corresponds to the pilot valve 202, the lower end of the pilot valve body 201 is provided with a pilot valve inlet 208, the pilot valve inlet 208 is communicated with the main valve inlet 105 through a lower guide pipe 3, the pilot valve cavity 204 is communicated, the outer wall of the main valve clack 102 is provided with a piston ring 107, the main valve clack 102 and a cylinder sleeve 103 are sealed by the piston ring 107, the outer end of the cylinder sleeve 103 is provided with a valve plate 108, a seat return spring 109 is arranged between the valve plate 108 and the main valve clack 102, a back pressure cavity 110 is formed by the space enclosed by the cylinder sleeve 103, the valve plate 108, a one-way check valve 5 is arranged in the valve plate 108, a main valve inlet 105 is communicated with the back pressure cavity 110 by the one-way check valve 5, the middle of the upper guide pipe 4 is connected with a two-way check valve 6, the two-way check valve 6 comprises a two-way check valve body 61 and a two-way slide valve 62, the two-way slide valve 62 is positioned in the two-way check valve body 61 and can slide left and right, the left end of the two-way check valve body 61 is, the back pressure chamber 110 communicates with the annular chamber 63 through internal passages in the valve plate 108; the sealing surface of the pilot valve clack 202 corresponding to the pilot valve seat 205 is a metal hard sealing surface, and the sealing surface of the lower end of the sliding valve 203 corresponding to the pilot valve seat 205 is a metal hard sealing surface. By adopting the technical scheme, the main valve clack 102 and the cylinder sleeve 103 are arranged on the side of the main valve inlet 105 of the main valve body 101, and the high-temperature and high-pressure resistant piston ring 107 is used for sealing, although the sealing effect of the piston ring 107 is not good as that of an O-shaped sealing ring, the leakage generated between the main valve clack 102 and the cylinder sleeve 103 is still in the main valve inlet 105, so that the requirements of high-temperature and high-pressure resistance are met, and the medium cannot be leaked to the main valve outlet 106 or the outside. The utility model discloses one-way check valve 5 and two-way check valve 6 have been increased, when medium pressure is less than the setting value, the system is in normal operating conditions, spool 203 in the pilot valve chamber 204 is in the open mode, one-way check valve 5 also is in the closed condition, pressure medium passes through downcomer 3 from the main valve import 105, pilot valve chamber 204 and last pipe 4 enter into the left side of two-way check valve 6, promote the passageway between pipe 4 on two-way spool 62 slides right and shutoff two-way check valve body 61 and the right side, pressure medium is through recess 64, annular chamber 63, the internal passage of valve plate 108 enters into back pressure chamber 110, form the backpressure, make main valve 1 be in and close, the encapsulated situation. When the medium pressure rises to reach the setting pressure, the medium pushes the slide valve 203 to move upwards and jack the pilot valve clack 202, the pilot valve 2 is opened, and the slide valve 203 blocks the gas passing passage of the pilot valve cavity 204; meanwhile, the one-way check valve 5 is opened under the action of medium pressure, medium enters the annular cavity 63 of the two-way check valve 6 through the internal passages of the one-way check valve 5, the back pressure cavity 110 and the valve plate 108 and pushes the two-way slide valve 62 to slide leftwards, the two-way slide valve 62 blocks the passage between the two-way check valve body 61 and the left upper guide pipe 4, the medium enters the main valve outlet 106 through the right upper guide pipe 4, at the moment, the back pressure cavity 110 is communicated with the main valve outlet 106, the main valve clack 102 is opened under the action of the medium pressure in the main valve inlet 105, so that the pressure of the system is relieved, in the process, although the pilot valve 2 is in an opening state, the slide valve 203 and the two-way slide valve 62 isolate the pressure medium, therefore, only a small amount of medium in the pilot valve 204 is discharged at the. When the pressure medium is reduced to a certain value, the pilot valve clack 202 returns to the seat under the action of the spring, the pilot valve clack 202 is closed, the pilot valve clack 202 pushes the slide valve 203 to move downwards, the gas passing passage between the slide valve 203 and the pilot valve cavity 204 is opened, the pressure medium enters the back pressure cavity 110 through the pilot valve cavity 204 again, and the main valve clack 102 is closed under the action of the pressure medium and the return seat spring 109. The utility model discloses an adopt the piston ring between main valve clack 102 and the cylinder liner 103, all removed O shape sealing washer in main valve 1 and the pilot valve 2, can use in the highly compressed occasion of high temperature, have that the flow resistance is little, the discharge capacity is big, sealed specific pressure is big, sealing performance is good and can be able to bear or endure the characteristics of higher backpressure. The pilot valve 2 has large flow and sensitive action, the upper sealing surface and the lower sealing surface are both metal hard seals, and the one-way check valve 5 and the two-way check valve 6 are arranged, so that the air inlet and the air outlet in the back pressure cavity 110 are faster, the action of the main valve 1 is more sensitive, and the purposes of fast opening and fast closing are achieved.

The pilot valve body 201 is a split structure, and the pilot valve seat 205 is clamped in the middle of the pilot valve body 201 and sealed by a high temperature and high pressure resistant gasket 207. And a high-temperature and high-pressure resistant gasket 207 is adopted, so that the pilot valve 2 can bear high temperature and high pressure.

A small spring 206 is arranged between the lower end of the slide valve 203 and the pilot valve body 201. The small spring 206 keeps the upper end of the spool valve 203 in contact with the pilot valve flap 202 at all times and the pilot valve 2 is more sensitive to action.

A filter 7 is installed between the lower pipe 3 and the main valve body 101. The filter 7 is able to filter impurities in the medium, avoiding clogging of the pilot valve 2.

The side wall of the two-way spool valve 62 is provided with a groove 64 in the axial direction. The grooves 64 are media channels.

The sealing surfaces of the two ends of the two-way slide valve 62 corresponding to the two ends of the two-way check valve body 61 are metal hard sealing surfaces. The hard sealing structure can bear higher temperature and pressure, and the sealing is reliable.

The points to be finally explained are: "upper", "lower", "left" and "right" indicate relative positional relationships of parts in the drawings of the specification, and when the absolute position of a described object is changed, the relative positional relationships may be changed.

Claims

1. A high-temperature and high-pressure resistant pilot operated safety valve comprises a main valve (1) and a pilot valve (2), wherein the main valve (1) comprises a main valve body (101), a main valve clack (102), a cylinder sleeve (103) and a main valve seat (104), the main valve body (101) is provided with a main valve inlet (105) and a main valve outlet (106), the main valve clack (102) is positioned in the cylinder sleeve (103) and can slide in the cylinder sleeve (103), the main valve clack (102) corresponds to the main valve seat (104), the pilot valve (2) comprises a pilot valve body (201), a pilot valve clack (202), a pilot valve (203) and a pilot valve seat (205), a pilot valve cavity (204) is arranged in the pilot valve seat (205), the pilot valve (203) penetrates through the pilot valve (204), the upper end of the pilot valve (203) corresponds to the pilot valve cavity (202), the lower end of the valve body (201) is provided with a pilot valve inlet (208), and the pilot, the pilot valve cavity (204) is communicated with the main valve outlet (106) through an upper guide pipe (4), and is characterized in that: the main valve clack (102) and the cylinder sleeve (103) are located on one side of a main valve inlet (105) of a main valve body (101), a piston ring (107) is mounted on the outer wall of the main valve clack (102), the main valve clack (102) and the cylinder sleeve (103) are sealed through the piston ring (107), a valve plate (108) is arranged at the outer end of the cylinder sleeve (103), a return spring (109) is arranged between the valve plate (108) and the main valve clack (102), a back pressure cavity (110) is formed by a space enclosed by the cylinder sleeve (103), the valve plate (108) and the main valve clack (102), a one-way check valve (5) is mounted in the valve plate (108), the main valve inlet (105) is communicated with the back pressure cavity (110) through the one-way check valve (5), a two-way check valve (6) is connected to the middle of the upper guide pipe (4), the two-way check valve (6) comprises a two-way check valve, the left end of the two-way check valve body (61) is communicated with the pilot valve cavity (204), the right end of the two-way check valve body (61) is communicated with the main valve outlet (106), an annular cavity (63) is arranged between the right end of the two-way slide valve (62) and the two-way check valve body (61), and the back pressure cavity (110) is communicated with the annular cavity (63) through an internal channel in the valve plate (108); the sealing surface of the pilot valve clack (202) corresponding to the pilot valve seat (205) is a metal hard sealing surface, and the sealing surface of the lower end of the sliding valve (203) corresponding to the pilot valve seat (205) is a metal hard sealing surface.

2. The high temperature and high pressure resistant pilot operated safety valve of claim 1, wherein: the pilot valve body (201) is of an upper and lower split structure, and the pilot valve seat (205) is clamped in the middle of the pilot valve body (201) and sealed through a high-temperature and high-pressure resistant gasket (207).

3. The high temperature and high pressure resistant pilot operated safety valve of claim 1, wherein: a small spring (206) is arranged between the lower end of the slide valve (203) and the pilot valve body (201).

4. The high temperature and high pressure resistant pilot operated safety valve of claim 1, wherein: and a filter (7) is arranged between the lower guide pipe (3) and the main valve body (101).

5. The high temperature and high pressure resistant pilot operated safety valve of claim 1, wherein: the side wall of the two-way sliding valve (62) is provided with a groove (64) along the axial direction.

6. The high temperature and high pressure resistant pilot operated safety valve of claim 4, wherein: and sealing surfaces of two ends of the two-way sliding valve (62) and two ends of the two-way check valve body (61) which correspond to each other are metal hard sealing surfaces.