CN210069055U

CN210069055U - Piston type safety relief valve

Info

Publication number: CN210069055U
Application number: CN201920285173.0U
Authority: CN
Inventors: 童成彪; 周江
Original assignee: Hunan Agricultural University
Current assignee: Hunan Agricultural University
Priority date: 2019-03-06
Filing date: 2019-03-06
Publication date: 2020-02-14
Anticipated expiration: 2029-03-06

Abstract

The utility model discloses a piston safety relief valve, the grit chamber is through first pressure pipe and second pressure pipe and epicoele intercommunication of drawing, first pressure pipe is last to be provided with first normally open ball valve, be provided with first filter between the first normally open ball valve, the second is drawn and is provided with a pair of second normally open ball valve on the pipe, should be provided with the second filter between the second normally open ball valve, the jar is equipped with first pressure release pipe on the piston, be equipped with first pilot valve on the first pressure release pipe in proper order, third filter and third normally open ball valve, first pilot valve passes through the pipeline and is connected with first pressure pipe, first pilot valve both ends are connected with a second pressure release pipe, be provided with the second pilot valve on the second pressure release pipe, the second pilot valve passes through the pipeline and is drawn and is pressed the union coupling with the second, and be provided with fourth filter and first solenoid valve on this pipeline, the jar still is equipped with the third pressure release pipe on the piston, be equipped with second solenoid, A fifth filter and a fourth normally open ball valve. Has the advantages of long service life, high reliability and high stability.

Description

Piston type safety relief valve

Technical Field

The utility model relates to a water supply, diversion engineering decompression pressure release technique, in particular to a piston type safety relief valve.

Background

The pressure relief valve is also called a safety valve, can be automatically opened and closed according to the working pressure of the system, and is generally installed on equipment or a pipeline to protect the safety of the system. When the pressure in the equipment or the pipeline exceeds the set pressure of the pressure release valve, the pressure release valve is automatically opened, the medium pressure in the equipment or the pipeline is ensured to be below the set pressure, the equipment and the pipeline are protected, and accidents are prevented.

The existing pressure release valve adopts a rubber diaphragm type structure, a diaphragm of the pressure release valve is easy to damage, the service life of the pressure release valve is short, a control system of the pressure release valve is not provided with a redundancy design, and the reliability and the stability of the pressure release valve are insufficient when the pressure release valve is in overpressure.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome the not enough of prior art, provide a piston safety relief valve that long service life, reliability and stability are high.

In order to solve the technical problem, the utility model discloses a following technical scheme:

a piston type safety relief valve comprises a valve body, wherein a bottom cavity and an upper cavity are arranged in the valve body, a piston type valve core for opening and closing a communication port between the bottom cavity and the upper cavity is arranged in the valve body, the piston type safety relief valve further comprises a sand setting tank arranged on a main pipeline, the sand setting tank is communicated with the upper cavity through a first pressure pipe and a second pressure pipe respectively, a pair of first normally open ball valves are arranged on the first pressure pipe, a first filter is arranged between the pair of first normally open ball valves, a pair of second normally open ball valves are arranged on the second pressure pipe, a second filter is arranged between the pair of second normally open ball valves, a first pressure relief pipe is arranged on an upper piston cylinder used for pressure relief at the top of the upper cavity, a first pilot valve, a third filter and a third normally open ball valve are sequentially arranged on the first pressure relief pipe, the first pilot valve is connected with the first pressure pipe through a pipeline, and two ends of the, the second pressure release pipe is provided with a second pilot valve, the second pilot valve is connected with the second pressure release pipe through a pipeline, a fourth filter and a first electromagnetic valve are arranged on the pipeline, the piston upper cylinder is further provided with a third pressure release pipe, and the third pressure release pipe is sequentially provided with a second electromagnetic valve, a fifth filter and a fourth normally-open ball valve.

As a further improvement of the above technical solution:

and a pressure relief branch pipe is arranged on the third pressure relief pipe, and a first normally closed ball valve is arranged on the pressure relief branch pipe.

And a third pressure leading pipe is connected between the bottom cavity and the first pressure leading pipe, and a second normally closed ball valve is arranged on the third pressure leading pipe.

And a fourth pressure leading pipe is connected between the bottom cavity and the pipeline where the second pilot valve is located, and a third normally closed ball valve is arranged on the fourth pressure leading pipe.

And the second pressure leading pipe is provided with a needle valve.

The periphery of the piston type valve core is provided with hollow drainage grooves which are uniformly arranged at intervals.

Compared with the prior art, the utility model has the advantages of:

1. the utility model discloses a piston safety relief valve, it is equipped with tertiary redundant design, ensures reliability and the stability of valve work when the superpressure.

2. The utility model discloses a piston safety relief valve adopts piston driven no diaphragm structure, and the relief valve that adopts the rubber diaphragm formula than the tradition is longe-lived, does not have the condition that the diaphragm damaged.

3. The utility model discloses a piston safety relief valve, piston case whole form a squirrel cage structure, and rivers flow through the squirrel cage rectification, have increased the flow resistance, have reduced the speed of flow to play fine anti cavitation erosion effect, be fit for the occasion of high pressure.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

The reference numerals in the figures denote:

1. a valve body; 2. a bottom cavity; 3. an upper chamber; 4. a piston-type valve core; 41. hollowing out the drainage channel; 5. a sand setting tank; 6. a first pressure leading pipe; 61. a first normally open ball valve; 62. a first filter; 7. a second pressure leading pipe; 71. a second normally open ball valve; 72. a second filter; 73. a needle valve; 8. a first pressure relief tube; 81. a first pilot valve; 82. a third filter; 83. a third normally open ball valve; 9. a second pressure relief tube; 10. a second pilot valve; 11. a fourth filter; 12. a first solenoid valve; 13. a third pressure relief tube; 131. a second solenoid valve; 132. a fifth filter; 133. a fourth normally open ball valve; 134. decompression and pipe distribution; 135. a first normally closed ball valve; 14. a third pressure leading pipe; 141. a second normally closed ball valve; 15. a fourth pressure leading pipe; 151. a third normally closed ball valve.

Detailed Description

The invention will be described in further detail with reference to the drawings and specific examples.

As shown in fig. 1, an embodiment of the piston type safety relief valve of the present invention comprises a valve body 1, a bottom cavity 2 and an upper cavity 3 are arranged in the valve body 1, a piston type valve core 4 for opening and closing a communication port between the bottom cavity 2 and the upper cavity 3 is arranged in the valve body 1, the piston type safety relief valve further comprises a sand setting tank 5 arranged on a main pipeline, the sand setting tank 5 is communicated with the upper cavity 3 through a first pressure guiding pipe 6 and a second pressure guiding pipe 7 respectively, the first pressure guiding pipe 6 is provided with a pair of first normally open ball valves 61, a first filter 62 is arranged between the pair of first normally open ball valves 61, the second pressure guiding pipe 7 is provided with a pair of second normally open ball valves 71, a second filter 72 is arranged between the pair of second normally open ball valves 71, a first pressure relief pipe 8 is arranged on a piston upper cylinder for relieving pressure at the top of the upper cavity 3, the first pressure relief pipe 8 is provided with a first pilot valve 81, the first pilot valve 81 is connected with the first pressure-relief pipe 6 through a pipeline, two ends of the first pilot valve 81 are connected with a second pressure-relief pipe 9, a second pilot valve 10 is arranged on the second pressure-relief pipe 9, the second pilot valve 10 is connected with the second pressure-relief pipe 7 through a pipeline, a fourth filter 11 and a first electromagnetic valve 12 are arranged on the pipeline, a third pressure-relief pipe 13 is further arranged on the piston, and a second electromagnetic valve 131, a fifth filter 132 and a fourth normally-open ball valve 133 are sequentially arranged on the third pressure-relief pipe 13. In the structure, when the sand setting tank works normally, water is introduced into the piston upper cylinder by the sand setting tank 5 through the first pressure guide pipe 6 and the second pressure guide pipe 7 to drive the piston type valve core 4 to seal a communication opening between the bottom cavity 2 and the upper cavity 3; when overpressure occurs, water in the upper chamber 3 is discharged by the first pilot valve 81, the third filter 82 and the third normally-open ball valve 83, and the piston type valve core 4 is opened to realize pressure relief; when the first pilot valve 81 is in fault, the first electromagnetic valve 12 is electrified, the second pilot valve 10 works and is opened, water in the piston upper cylinder is discharged by the second pressure relief pipe 9, the second pilot valve 10, the third filter 82 and the third normally-open ball valve 83, and the piston type valve core 4 is opened to realize pressure relief; when the first pilot valve 81 and the second pilot valve 10 are both in failure, the second electromagnetic valve 131 is electrified, water in the piston upper cylinder is discharged by the third pressure relief pipe 13, the second electromagnetic valve 131, the fifth filter 132 and the fourth normally-open ball valve 133, and the piston type valve core 4 is opened to realize pressure relief. The pressure release valve is provided with a three-level redundancy design, so that the working reliability and stability of the valve under overpressure are ensured; the utility model discloses a piston driven does not have diaphragm structure, adopts the relief valve of rubber diaphragm formula longe-lived than the tradition, does not have the condition that the diaphragm damaged.

In this embodiment, the third pressure relief pipe 13 is provided with a pressure relief branch pipe 134, and the pressure relief branch pipe 134 is provided with a first normally closed ball valve 135. In the structure, when the second electromagnetic valve 131 fails, the first normally closed ball valve 135 can be manually opened, and water in the upper cylinder of the piston is discharged through the pressure relief branch pipe 134, the fifth filter 132 and the fourth normally open ball valve 133, so that the working reliability and stability during overpressure are further improved.

In this embodiment, a third pressure guiding pipe 14 is connected between the bottom cavity 2 and the first pressure guiding pipe 6, and a second normally closed ball valve 141 is arranged on the third pressure guiding pipe 14. The third pressure guide pipe 14 and the second normally-closed ball valve 141 are arranged for standby, so that the piston type valve core 4 can be ensured to be in a closed state under normal working conditions when the first pressure guide pipe 6 and the second pressure guide pipe 7 are prevented from being blocked.

In this embodiment, a fourth pressure-leading pipe 15 is connected between the bottom cavity 2 and the pipe where the second pilot valve 10 is located, and a third normally-closed ball valve 151 is arranged on the fourth pressure-leading pipe 15. The fourth pressure leading pipe 15 and the third normally closed ball valve 151 are arranged for standby, and the piston type valve core 4 can be ensured to be in a closed state under the normal working condition when the first pressure leading pipe 6 and the second pressure leading pipe 7 are prevented from being blocked.

In this embodiment, the second pressure guiding pipe 7 is provided with a needle valve 73. The needle valve 73 is used to regulate the flow, regulate the closing speed,

in this embodiment, the circumferential surface of the piston type valve core 4 is provided with hollow drainage grooves 41 which are uniformly arranged at intervals. This fretwork water drainage tank 41 makes piston case 4 whole form a squirrel cage structure, and rivers flow through the rectification of squirrel cage, have increased flow resistance, have reduced the flow speed to play fine anti cavitation erosion effect, be fit for the occasion of high pressure. In other embodiments, the hollowed-out drainage channel 41 may be replaced by a drainage hole.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The technical solution of the present invention can be used by anyone skilled in the art to make many possible variations and modifications, or to modify equivalent embodiments, without departing from the scope of the technical solution of the present invention, using the technical content disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention should fall within the protection scope of the technical solution of the present invention.

Claims

1. The utility model provides a piston safety relief valve, includes valve body (1), be equipped with bottom chamber (2) and epicoele (3) in valve body (1), built-in piston case (4) that are used for opening and close intercommunication mouth between bottom chamber (2) and epicoele (3) that are equipped with of valve body (1), its characterized in that: the sand setting tank (5) is arranged on the main pipeline, the sand setting tank (5) is communicated with the upper cavity (3) through a first pressure leading pipe (6) and a second pressure leading pipe (7) respectively, a pair of first normally-open ball valves (61) is arranged on the first pressure leading pipe (6), a first filter (62) is arranged between the pair of first normally-open ball valves (61), a pair of second normally-open ball valves (71) is arranged on the second pressure leading pipe (7), a second filter (72) is arranged between the pair of second normally-open ball valves (71), a first normally-open pressure relief pipe (8) is arranged on a piston upper cylinder used for pressure relief at the top of the upper cavity (3), a first pilot valve (81), a third filter (82) and a third ball valve (83) are sequentially arranged on the first pressure relief pipe (8), and the first pilot valve (81) is connected with the first pressure leading pipe (6) through a pipeline, the hydraulic control valve is characterized in that two ends of the first pilot valve (81) are connected with a second pressure relief pipe (9), a second pilot valve (10) is arranged on the second pressure relief pipe (9), the second pilot valve (10) is connected with a second pressure relief pipe (7) through a pipeline, a fourth filter (11) and a first electromagnetic valve (12) are arranged on the pipeline, a third pressure relief pipe (13) is further arranged on the piston upper cylinder, and a second electromagnetic valve (131), a fifth filter (132) and a fourth normally open ball valve (133) are sequentially arranged on the third pressure relief pipe (13).

2. The piston-type safety relief valve according to claim 1, characterized in that: the third pressure relief pipe (13) is provided with a pressure relief branch pipe (134), and the pressure relief branch pipe (134) is provided with a first normally closed ball valve (135).

3. The piston-type safety relief valve according to claim 2, characterized in that: and a third pressure leading pipe (14) is connected between the bottom cavity (2) and the first pressure leading pipe (6), and a second normally closed ball valve (141) is arranged on the third pressure leading pipe (14).

4. The piston-type safety relief valve according to claim 3, characterized in that: and a fourth pressure leading pipe (15) is connected between the bottom cavity (2) and the pipeline where the second pilot valve (10) is located, and a third normally closed ball valve (151) is arranged on the fourth pressure leading pipe (15).

5. The piston-type safety relief valve according to any one of claims 1 to 4, characterized in that: and a needle valve (73) is arranged on the second pressure guiding pipe (7).

6. The piston-type safety relief valve according to any one of claims 1 to 4, characterized in that: the peripheral surface of the piston type valve core (4) is provided with hollow drainage grooves (41) which are uniformly arranged at intervals.

7. The piston-type safety relief valve according to claim 5, characterized in that: the peripheral surface of the piston type valve core (4) is provided with hollow drainage grooves (41) which are uniformly arranged at intervals.