RU2498247C1 - Gas pressure control valve - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: gas pressure control valve comprises a casing, a spring-loaded sensitive element in the form of a diaphragm with a disk and a throttle valve with a seat. The said diaphragm consists of metal layers one of which on the regulated pressure side is made of weld steel and is welded to the casing and the disk of the diaphragm on the outer and inner profile respectively while the other layers are made of springy steel.

EFFECT: improvement of operation accuracy and cycling durability of the control valve under high working gas pressure.

2 dwg

Description

The invention relates to automatic devices for regulating gas pressure and can be used in power engineering.

Gas pressure regulators are known for which elastic non-metallic membranes are used as a sensitive element (see, for example, USSR author's certificate No. 587450, G05D 16/06, with a priority of 06/03/1976).

This design is not functional when the value of the regulated pressure of the gas reducer is more than 10 kgf / cm ² , because non-metallic membranes do not withstand the strength of such pressure. In addition, non-metallic materials do not withstand large temperature differences (e.g. ± 70 ° C). Under such conditions, failure of the gas pressure reducer is inevitable. These operating conditions require the use of metal membranes or bellows.

Also known is a gas pressure reducer, taken as a prototype of the invention, having a metal membrane as a sensitive element (see USSR author's certificate No. 890370, G05D 16/06, with priority dated 12/17/1979).

The disadvantage of a gas pressure reducer is that with an increase in the regulated pressure (i.e., with an increase in the membrane thickness), the static accuracy of pressure reduction and the cyclic strength of the sensing element of the gas pressure reducer decrease.

This invention is aimed at eliminating the specified disadvantage of the prototype.

For this, the known reducer, unlike the prototype, is equipped with a membrane composed of metal layers, one of which, on the adjustable pressure side, is made of welded steel and, to ensure the tightness of the product, is welded to the membrane housing and plate along the outer and inner contours, respectively, and the rest the layers are made of spring steel with high cyclopressure.

This design of the gearbox will ensure its performance at high gas pressure without loss of static control accuracy and cyclical strength of the sensing element by performing a membrane consisting of metal layers, the characteristics of which are determined by the magnitude of the adjustable pressure.

The invention is illustrated by drawings, where in Fig.1 shows a General view of the gas pressure reducer, Fig.2 - callout G.

The gearbox contains the following basic elements:

- housing 1 with tips A and B for the supply and removal of gas;

- an actuating element of a spring-loaded throttling valve 2, seat B and pusher 3 between the valve and the membrane plate;

- pressure adjuster in the form of a power spring 4;

- adjusting screw 5;

- sensitive element - membrane 6.

The membrane 6 is composed of metal layers, one of which 7 on the adjustable pressure side is made of welded steel, the other 8 is made of spring steel. Layer 7 is welded to the collar 10 of the housing 1 along the outer contour and welded to the collar of the plate 9 of the membrane 6 along the inner contour.

When the gearbox is operating, the high-pressure gas enters the gearbox tip A, passes into the cavity G, from where it passes through the throttle gap formed between the edge of the seat B and the spherical surface of the valve 2 into the cavity D, where it acts on the sensing element - the membrane 6, and is discharged to to the consumer through the tip B.

In the cavity D, an adjustable pressure is automatically maintained, equal to the setting pressure, which is determined by the tightening force of the master spring 4, using a screw 5.

When the adjustable pressure does not match the pressure of the gearbox setting, forces arise on the membrane 6 that move it, while the layers move simultaneously, because fit tightly together. Layer 7 ensures tightness due to the welding performed, and together with layer 8 it provides the required strength.

The use of the invention provides improved accuracy and cyclopressure of the gearbox at high working gas pressure.

Claims (1)

A gas pressure reducer comprising a housing, a spring-loaded sensing element in the form of a membrane with a plate and a throttling valve with a seat, characterized in that the membrane is composed of metal layers, one of which, on the adjustable pressure side, is made of welded steel and welded to the body and plate membranes along the outer and inner contours, respectively, and the remaining layers are made of spring steel.

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