CN2355184Y

CN2355184Y - Back pressure regulating valve

Info

Publication number: CN2355184Y
Application number: CN 98251130
Authority: CN
Inventors: 倪逸韧; 史祖英; 陆其标
Original assignee: CHANGZHOU ELECTRIC POWER MACHINERY FACTORY
Current assignee: CHANGZHOU ELECTRIC POWER MACHINERY FACTORY
Priority date: 1998-12-25
Filing date: 1998-12-25
Publication date: 1999-12-22
Anticipated expiration: 2008-12-25

Abstract

The utility model relates to a back pressure regulating valve, which is used for a thermodynamic system and is provided with a valve body, a valve cover, a regulating screw, a spring and an elastic membrane. A water inlet and a water outlet are arranged on the valve body; a valve seat which is in screw connection with the valve body is arranged on the valve body; the lower end surface of the valve seat is provided with a seal ring. A central through hole which is arranged on the valve seat is communicated the water inlet. A cavity which is communicated with the water inlet is formed among the elastic membrane, the valve body and the valve seat. A valve core which can match with the valve seat is in screw connection with a spring seat; the lower end of the spring seat is provided with a seal ring. The central part of the elastic membrane is tightly clamped by the spring seat and the valve core. The utility model can keep the back pressure stable, having the advantages of simple structure and practicality.

Description

Back pressure regulating valve

The utility model relates to a kind of valve.

In thermal power generation or heating system, need be to working medium such as water, steam carries out online detection, sample water or steam need just to flow to analysis meter behind pressure and temperature reducing, but because the thermodynamic system load changes at any time, make through post-decompression sample water of reduction valve or steam pressure surge thereupon, and the accuracy of impact analysis meter reading.Existing solution is to replace reduction valve with a kind of baffle-type pressure maintaining valve, when the pressure of this valve inlet becomes big, turns down the gap of spout and baffle plate, and the pressure of outlet is remained unchanged; When inlet pressure diminished, it is big that the gap of spout and baffle plate becomes, and outlet pressure is also remained unchanged, the voltage stabilizing again of should reducing pressure of the valve of this structure, and the pressure that inlet bears is bigger, and fragile spout, baffle plate are impracticable.

The purpose of this utility model is to provide a kind of and both can be parallel on the analysis meter pipeline with the sample strain of steady flow to analysis meter, simple and practical again back pressure regulating valve.

In order to achieve the above object, the technical solution of the utility model is as follows: a kind of back pressure regulating valve, has valve body, valve gap, adjusting screw rod, spring and flexible sheet, the people mouth of a river and water outlet are arranged on the valve body, and the flexible sheet clamping is between valve body and valve gap, spring is located between flexible sheet and the adjusting screw rod, a valve seat is arranged on the valve body, this valve seat and valve body are to be threaded and the lower end surface is provided with seal ring, valve seat has central through bore, the lower end mouth of central through bore communicates with water outlet, constitute a cavity that communicates with water inlet between flexible sheet and the valve body, one spool that can match with valve seat and spring seat are arranged to be threaded, the lower end of spring seat is provided with seal ring, and the flexible sheet central part clamps by spring seat and spool.

After adopting said structure, when increasing owing to water inlet pressure, the water of water inlet drives the flexible sheet epirelief, moves on the spool, and the opening of spool and valve base chamber is strengthened, and the flow that flows through water outlet increases, thereby makes the falling of water inlet pressure, so that keeps stable again; When water inlet pressure reduced, it is recessed that flexible sheet is promoted by spring force, and spool moves down, and turns down the gap with valve seat, and the flow that flows through water outlet is reduced, and water inlet pressure returns long, and keeps a constant back pressure; In addition, total is simple, is active in one's movements, and is practical.

Below in conjunction with drawings and Examples the utility model is described in further detail.

Fig. 1 is the structural representation of back pressure regulating valve of the present utility model.

As shown in Figure 1, back pressure regulating valve of the present utility model, have valve body (11), valve gap (3), adjusting screw rod (2), spring (5) and flexible sheet (8), water inlet (12) and water outlet (10) are arranged on the valve body (11), and between flexible sheet (8) clamping valve body (11) and the valve gap (3), valve body (11) and valve gap (3) adopt and are threaded, and spring (5) is located between flexible sheet (8) and the adjusting screw rod (2).A valve seat (9) is arranged on the valve body (11), and this valve seat (9) is threaded with valve body (11) and the lower end surface is provided with seal ring (13), and valve seat (9) has central through bore (14), and the lower end mouth of central through bore (14) reveals the mouth of a river (10) and communicates; Constitute a cavity (16) that communicates with water inlet (12) between flexible sheet (8) and valve body (11) and the valve seat (9); A spool (6) that can match with valve (9) seat is arranged, the bottom of spool (6) is cone (15), it also can be cylinder, spool (6) upper end is threaded with spring seat (18), the lower end of spring seat (17) is provided with seal ring (7), and flexible sheet (8) central part clamps by spring seat (17) and spool (6).Handwheel (1) is equipped with in adjusting screw rod (2) upper end, adjusting screw rod (2) lower end withstands on the gland (4) of spring (5), rotate handwheel (1) and adjusting screw rod (2) is compressed or pull-off spring (5), thereby regulate the precompression of flexible sheet (8), with the requirement of the different back pressures that satisfy default.

The bottom of spool (6) is that the benefit of cone (15) is, make this back pressure regulating valve when automatic pressure regulation, the pressure of system and flow have the process of a gradual change, rather than a kind of sudden change, can increase the regulation range of back pressure regulating valve like this, improve its adjusting function.

Claims

1, a kind of back pressure regulating valve, have valve body (11), valve gap (3), adjusting screw rod (2), spring (5) and flexible sheet (8), water inlet (12) and water outlet (10) are arranged on the valve body (11), and flexible sheet (8) clamping is between valve body (11) and valve gap (3), spring (5) is located between flexible sheet (8) and the adjusting screw rod (2), it is characterized in that:

On a, the valve body (11) valve seat (9) is arranged, this valve seat (9) is threaded with valve body (11) and the lower end surface is provided with seal ring (13), and valve seat (9) has central through bore (14), and the lower end mouth of central through bore (14) communicates with water outlet (10);

Constitute a cavity (16) that communicates with water inlet (12) between b, flexible sheet (8) and valve body (11) and the valve seat (9);

C, have one can be threaded with spring seat (18) with the spool (6) that valve seat (9) match, the lower end of spring seat (17) is provided with seal ring (7), and flexible sheet (8) central part is by spring seat (17) and spool (6) clamping.

2, back pressure regulating valve according to claim 1 is characterized in that: the bottom of described spool (6) is cone (15).