CN201125739Y

CN201125739Y - Hydraulic safety valve

Info

Publication number: CN201125739Y
Application number: CNU2007203071235U
Authority: CN
Inventors: 李兰芳; 杨福
Original assignee: Yongcheng Coal and Electricity Holding Group Co Ltd
Current assignee: Yongcheng Coal and Electricity Holding Group Co Ltd
Priority date: 2007-12-04
Filing date: 2007-12-04
Publication date: 2008-10-01
Anticipated expiration: 2017-12-04

Abstract

A hydraulic safety valve is mainly composed of a joint, a valve core having a holding cover, a sealing ring, a valve seat installed in the a spring sleeve, a spring pocket, a spring, a pressure regulating plug. The liquid in the joint passes through a ring boss at the hole external rim, when in the close state, the ring boss is in tight joint with the sealing ring in the valve core. The spring pressure is adjusted to set the system allowable value, when the system pressure is lower than the allowable value, the valve core is in the close state, when the system pressure is higher than the allowable value, the pressure acted on the valve overcomes the spring pressure to lead the valve core to move outwards for releasing the system pressure. After the system pressure falls, the valve core comes back under the action of the spring force, and is again in the close state. The device has simple structure, reliable action, little abrasion on the sealing units, long service life, good sealing effect, convenient maintenance.

Description

A kind of deadweight safety valve

One, technical field

The utility model relates to the deadweight safety valve that a kind of mine hydraulic support is used, and is applicable to the safeguard protection of high pressure liquid pressing systems such as mine hydraulic support.

Two, technical background

Safety valve is in traffic, engineering machinery, mining, generally use in the hydraulic pressure of extensive uses such as machining or the pneumatic system, safety element is absolutely necessary, when system pressure surpasses setting value, safety valve is opened a part of liquid in the system is discharged, system pressure is discharged, make system pressure be no more than permissible value, thereby the assurance system does not break down because of hypertonia and destroys, the employed safety valve of traditional hydraulic support is because structural reason, make the back sealing surface and the O RunddichtringO damages easily repeatedly allowing press, do not have good sealing effectiveness, the seepage phenomenon appears, cause hydraulic system not keep-up pressure and cause support to produce, influence support and normally use from falling.

Three, summary of the invention

The technical problems to be solved in the utility model is: design a kind of deadweight safety valve, be mainly used in the hydraulic system such as hydraulic support of high pressure, and press in the environment for use of work in frequent allowing, keep good seal, reliable in action for a long time.

Implementation procedure of the present utility model is such: it mainly contains connector, spool, spring spool, spring, pressure regulation screw plug composition, it is characterized in that: spool comprises maintainance set, sealing ring, valve seat three parts, sealing ring is fixed in valve seat by maintainance set, form an integral body, spool is installed in the spring spool; In connector, liquid is by annulus boss of hole outer edge design, during closure state, under the effect of spring, liquid fits tightly by the annulus boss of hole outer edge and the sealing ring in the spool, sealing surface is an annular sealing surface; On the spring spool inwall of the end that spool is installed, be provided with guide slide, spool corresponding with it is provided with guide chute, when assembling and set-pressure value, play and prevent to drive the spool rotation because of rotation pressure regulation screw plug, the effect of friction damage sealing ring play the guiding role when spool moves back and forth simultaneously.

Good effect of the present utility model is: simple in structure, reliable in action, the potted component little wear, in high-pressure system, can keep good sealing effectiveness for a long time, use in the underground hydraulic support frame system to allow pressures, pressurize stablize, long service life repeatedly allows still can keep good sealing effectiveness after pressing work, eliminated the seepage phenomenon, easy to maintenance.

Four, description of drawings

Accompanying drawing 1 is a structural representation of the present utility model; Accompanying drawing 2 is a spool schematic diagram of the present utility model; Accompanying drawing 3 is the left view of accompanying drawing 2.

Five, the specific embodiment

The utility model as shown in Figure 1, it mainly is made up of connector 1, spool 2, locking nut 3, spring spool 4, spring 5, pressure regulation screw plug 6, in the connector 1, liquid is by annulus boss 8 of hole 7 outer edge design; Spool 2 comprises maintainance set 10, sealing ring 9, valve seat 12 3 parts, sealing ring 9 is fixed in by maintainance set 10 and forms an integral body on the valve seat 12, and on a side end face, form a ring-shaped groove 13 by maintainance set 10 and valve seat 12, the end of ring-shaped groove 13 is sealing rings 9, the height that the degree of depth of ring-shaped groove 13 is equal to or slightly less than in the connector 1, liquid passes through the annulus boss 8 of hole 7 outer edge; Spool 2 is installed in the spring spool 4, is inserted in the spool ring-shaped groove 13 at the annulus boss 8 of closure state liquid by hole 7 outer edge, under the effect of spring 5, fits tightly with sealing ring 9 in the spool 2.On spring spool 4 inwalls of the end that spool 2 is installed, promptly spool 2 reciprocating parts are arranged with two guide slides, and spool 2 corresponding with it is provided with two guide chutes 11.

Its course of work is: the permissible value of adjusting the spring pressure adjusting system by pressure regulation screw plug 6, when system pressure is lower than permissible value, spool 2 is in closure state with the required pressure of maintenance system, when system pressure is higher than permissible value, acting on pressure that pressure on the spool 2 overcomes spring 5 moves 2 moments of spool outward, be in open-circuit condition, partially liq is discharged from chute 11 slits on the spool 2, delivery system pressure, after being reduced to permissible value under the system pressure, spool 2 is replied under the effect of spring force, is in closure state again, finishes the pressure process that once allows.

Claims

1, a kind of deadweight safety valve, it mainly contains connector (1), spool (2), spring spool (4), spring (5), pressure regulation screw plug (6) composition, it is characterized in that: spool (2) comprises maintainance set (10), sealing ring (9), valve seat (12) three parts, sealing ring (9) is fixed in valve seat (12) by maintainance set (10), form an integral body, spool (2) is installed in the spring spool (4); In connector (1), liquid is by hole (a 7) outer edge design annulus boss (8); During closure state, liquid fits tightly by the annulus boss (8) of hole (7) outer edge and the sealing ring (9) in the spool (2), and sealing surface is an annular sealing surface; Be provided with guide slide on spring spool (4) inwall of the end that spool (2) is installed, spool corresponding with it (2) is provided with guide chute (11).

2, deadweight safety valve according to claim 1, it is characterized in that: on spool (2) one side end faces, form a ring-shaped groove (13) by maintainance set (10) and valve seat (12), the end of ring-shaped groove (13) is sealing ring (9), the height that the degree of depth of ring-shaped groove (13) is equal to or slightly less than in the connector (1), liquid passes through the annulus boss (8) of hole (7) outer edge, liquid is inserted in the spool ring-shaped groove (13) by the annulus boss (8) of hole (7) outer edge.