CN101398099B

CN101398099B - Differential pressure type pressure relief valve

Info

Publication number: CN101398099B
Application number: CN2008101362305A
Authority: CN
Inventors: 王洪仁; 彭宗元
Original assignee: Zhejiang Danau Machinery Co ltd
Current assignee: ZHEJIANG DANAU INDUSTRIES CO., LTD.
Priority date: 2008-11-17
Filing date: 2008-11-17
Publication date: 2010-12-08
Anticipated expiration: 2028-11-17
Also published as: CN101398099A

Abstract

Then invention pertains to the technical field of pressure relief valves, and relates to a pressure relief valve of pressure-differential mode. The pressure relief valve comprises a valve body, and an inlet and an outlet are arranged on the valve body. The pressure relief valve is characterized in that: a diverging area, a return flow area, a depressurization hole and a pressure-guild hole are arranged in the valve body; the diverging area is positioned over the return flow area, and a return valve seat is arranged between the diverging area and the return flow area, and a valve core is arranged on the return valve seat; an upper core board is arranged at the upper end of a core rod at the middle part of the valve core, a lower core board is arranged at the lower end of the core rod, and the area of the upper core board is larger than that of the lower core board. After going through the diverging area, the lower part of the upper core board and the depressurization hole in sequence, the inlet is communicated with the outlet; and the outlet is communicated with the upper part of the upper valve board after going through the pressure-guild hole; and the inlet is communicated with the return flow area after going through the diverging area and the lower core board in turn; and the communication between the inlet and the return flow area is controlled by the up and down movement of the valve core. The invention has the advantage of convenient use, and can enhance the safety performance of a pressure system.

Description

Differential pressure type pressure relief valve

Technical field

The invention belongs to the pressure-relief valve technical field, more particularly, relate to a kind of differential pressure type pressure relief valve.

Background technique

In the application of many fluid systems, need carry out release to this fluid system, for example,, the parts that prevent fluid system damage and/or for avoiding taking place unusual condition etc. for causing.Therefore, how to provide a kind of pressure of pressure system that makes to descend, thereby improve the Safety performance of pressure system, it is extremely important just to become.

Summary of the invention

The technical problem to be solved in the present invention provides a kind of easy to use, differential pressure type pressure relief valve that can improve the Safety performance of pressure system.

The object of the present invention is achieved like this:

Differential pressure type pressure relief valve, comprise valve body, valve body is provided with import and outlet, it is characterized in that: in described valve body, be provided with shunting zone, the recirculating zone, decompression hole, the pressure guide hole, shunting zone is positioned at the top, recirculating zone, between shunting zone and recirculating zone, be provided with return valve seat, return valve seat is provided with spool, the upper end of the core bar at spool middle part is provided with central layer, the lower end is provided with down central layer, the area of last central layer is greater than the area of following central layer, described import is successively through shunting zone, the bottom of last central layer, be communicated with outlet behind the decompression hole, outlet is communicated with the top of last central layer behind the pressure guide hole, import is successively through shunting zone, be communicated with the conducting that moves up and down control import and recirculating zone of spool behind the following central layer with the recirculating zone.

One end of above-mentioned pressure guide hole is in the cavity conducting on top Yu the last central layer top of shunting zone.

The present invention is owing to adopted said structure, when normal working, high-pressure liquid produces the pressure loss through decompression hole, the pressure guide hole makes high-pressure liquid directly act on spool top, thereby makes the spool upper and lower surface that the effect of high-pressure liquid all be arranged, because high-pressure liquid passes through decompression hole in flowing after, its pressure descends, thereby the pressure that makes shunting zone is higher than the pressure of outlet, and then spool is upwards pushed away, and is gone out by outlet after whole high-pressure liquids are all entered by import again; When system pressure during greater than setting pressure, though the spool upper and lower surface all has the high-pressure liquid effect, but according to law of connected vessels, static fluid pressure everywhere equates, because the area that is subjected to pressure action on spool top is subjected to the pressure action area big than spool bottom, therefore, spool moves downward and opens the return flow line fully, whole high-pressure liquids are entered by import, the present invention spills out by the recirculating zone, thereby allows pressure descend, so can improve the Safety performance of pressure system, in addition, the present invention is easy to use.

Description of drawings

Fig. 1 is that the present invention is at the sectional view that normally goes out under the water state;

Fig. 2 is that the present invention is at the sectional view of closing out under the water state.

Embodiment

With specific embodiment the present invention is further described below, referring to Fig. 1-2:

Differential pressure type pressure relief valve, comprise valve body 10, valve body 10 is provided with import 8 and outlet 1, it is characterized in that: in described valve body 10, be provided with shunting zone 6, recirculating zone 11, decompression hole 3, pressure guide hole 2, shunting zone 6 is positioned at 11 tops, recirculating zone, between shunting zone 6 and recirculating zone 11, be provided with return valve seat 7, return valve seat 7 is provided with spool, the upper end of the core bar 12 at spool middle part is provided with central layer 4, the lower end is provided with down central layer 9, the area of last central layer 5 is greater than the area of following central layer 9, described import 8 is successively through shunting zone 6, the bottom of last central layer 4, decompression hole 3 backs are communicated with outlet 1, outlet 1 is communicated with the top of last central layer 4 behind pressure guide hole 2, import 8 is successively through shunting zone 6, following central layer 9 backs are communicated with recirculating zone 11, the conducting that moves up and down control import 8 and recirculating zone 11 of spool.

One end of above-mentioned pressure guide hole 2 is in cavity 5 conductings on top Yu last central layer 4 tops of shunting zone 6.

When the present invention works within the normal operating pressure of setting, referring to Fig. 1, high-pressure liquid enters into shunting zone 6 from import 8, part fluid flows to recirculating zone 11, a part arrives outlet 1 through decompression hole 3 forward, wherein produce the pressure loss through decompression hole 3, pressure guide hole 2 makes the high-pressure spray physical efficiency directly act on the top of the last central layer 4 of spool, thereby the upper and lower surface that makes central layer 4 all has the effect of high-pressure liquid and since high-pressure liquid in flowing through behind the decompression hole 3, its pressure decline, thereby make shunting zone 6 interior pressure be higher than the pressure of outlet 1, according to the principle of power, last central layer 4 is upwards pushed away, thereby has closed backflow, whole high-pressure liquids are all entered by import 8, go out by outlet 1, wherein, in the present embodiment, the pressure of high-pressure liquid when import 8 enters is 70Bar, then upwards thrust is 145KG, thereby the thrust when last central layer 4 tops down promote is less than 145KG.

The present invention is when when system pressure is worked greater than setting pressure, see Fig. 2, high-pressure liquid enters into shunting zone 6 from import 8, a part makes the high-pressure spray physical efficiency directly act on the top of the last central layer 4 of spool through decompression hole 3 to pressure guide hole 2 forward, thereby make central layer 4 upper and lower surfaces that the high-pressure liquid effect all be arranged, pressure amplification principle according to flow amplifier, static fluid pressure everywhere equates, because the area that is subjected to pressure action on last central layer 4 tops is subjected to the pressure action area big than following central layer 9, therefore, last central layer 4 moves downward simultaneously with following central layer 9 and progressively opens the return flow line, wherein the return flow line refers to shunting zone 6 passage by return valve seat 7 middle parts to the passage between the recirculating zone 11, thereby whole high-pressure liquids are entered by import 8, spill out by recirculating zone 11, wherein, the refluxing opening latus rectum of recirculating zone 11 is big, the outside is again a zero pressure, thereby the pressure at outlet 1 place is descended, after dropping to setting pressure to the pressure that exports 1 place, last central layer 4 moves upward simultaneously with following central layer 9 again, the closing volume passage, open liquid feeding channel, play the effect of safe infusion, when system pressure is crossed the higher position pressure release, just close the return flow line of pressure release after the decline, loop control successively reaches the purpose of maintenance system pressure less than the force value of setting.

Claims

1. differential pressure type pressure relief valve, comprise valve body, valve body is provided with import and outlet, it is characterized in that: in described valve body, be provided with shunting zone, the recirculating zone, decompression hole, the pressure guide hole, shunting zone is positioned at the top, recirculating zone, between shunting zone and recirculating zone, be provided with return valve seat, return valve seat is provided with spool, the upper end of the core bar at spool middle part is provided with central layer, the lower end is provided with down central layer, the area of last central layer is greater than the area of following central layer, described import is successively through shunting zone, the bottom of last central layer, be communicated with outlet behind the decompression hole, outlet is communicated with the top of last central layer behind the pressure guide hole, import is successively through shunting zone, be communicated with the conducting that moves up and down control import and recirculating zone of spool behind the following central layer with the recirculating zone.

2. differential pressure type pressure relief valve according to claim 1 is characterized in that: an end of described pressure guide hole is in the cavity conducting on top Yu the last central layer top of shunting zone.