SU1548572A1 - Safety valve - Google Patents

Abstract

This invention relates to a valve industry. The aim of the invention is to increase the reliability of the safety valve. With increasing pressure in the line, therefore in the inlet channel 3, above the permissible value, the control valve placed in the bore of the cover 2 is activated, and the locking member 17 opens the flow area, communicating the inlet channel 3 with the outlet 4 through the throttle 9 installed 13. The pressure in the bore 5 of the housing 1 is released and under the action of the pressure differential the shut-off member 9 is detached from the floating seat 8. The working medium through the resulting gap and the radial holes made in additional upenchatoy sleeve 20 mounted between the floating seat 8 and floating sleeve 11, enters the outlet channel 4, and this is carried out maintaining the working pressure in the line. Since the outer annular bores are made on the facing ends of the floating sleeve 11 and the floating seat 8, the floating sleeve 11 and the floating seat 8 are supported by their annular bore surfaces on the internal surfaces of the steps of the additional sleeve 20, and the sealing elements 6 and 7 are placed between the ends of the additional sleeve 20 and the ends of the annular bores of the floating sleeve 11 and the floating seat 8, possible distortions of the valve elements are compensated for by radial clearances while maintaining tightness. 1 il.

Description

The invention relates to valve construction and is intended to protect systems from overpressure in them in excess of the allowable value.

The aim of the invention is to improve the reliability of the device by increasing the tightness at different operating pressures.

The drawing shows the safety valve.

The safety valve includes a housing 1, covered with a cover 2. In the housing 1, there are inlet 3 and outlet 4 channels and a cylindrical bore 5 in which sealing elements 6 and 7 are placed, as well as a locking member 9 which is in contact with the floating seat 8 a floating seat 8 by a spring 10. The locking member 9 rests with its lateral lateral surface on the floating sleeve 11. A radial clearance 12 is formed between the sleeve 11 and the body 1. The locking member 9 in its end part is provided with a throttle 13, which is made in the plunger shank and 14, located between the end of the spring 10 and the locking member 9. The intermediate cavity 15 communicates with the inlet channel 3 through a throttling slot 16 formed between the outer surface of the shank of the plunger 14 and the inner surface of the bore of the locking member 9. The inlet channel 3 communicates with the outlet channel 4 through the choke 9 installed at the end of the closure member 9. 13 and a control valve placed in the bore of the lid 2 composed of a conical closure member 17

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g loading its spring 18, the compression force which is regulated by a screw 19.

An additional step bushing 20 with radial holes for the passage of the working medium is also installed in the bore of the housing 1.

Optional step bushing

20 is placed between the floating sleeve 11 and the floating seat 8, which forms a radial clearance with the body 1

21, while facing each other, the other ends of the floating sleeve 11 and the floating seat 8 are provided with external annular grooves. The floating sleeve 11 and the floating seat 8 are supported by the surfaces of their annular bores on the inner surfaces of the steps of the additional sleeve 20,

and sealing elements 6 and 7 are placed between the ends of the additional sleeve 20 and the ends of the annular bores of the floating sleeve 11 and the floating seat 8.

Restriction washers 22 and 23 are also placed in the bore of the housing 1, limiting the axial movement of the sleeves 20 and 11 and the floating seat 8. The cavity of the housing 1 is in communication with the working cavity of the solenoid valve 24, designed to control the operation of the safety valve. The increase in pressure in the working line is carried out by a pump 25 connected to a source of working medium.

The safety valve operates as follows.

By turning the screw 19, the compression force of the spring 18 is adjusted, which regulates the response pressure. When the pump 25 is put into operation, the pressure of the working fluid in the line rises and, if it exceeds the allowable amount of force, the locking member 17 moves from its effect, as a result of which the bore 5 of the housing 1 communicates with the outlet channel. The pressure in the bore 5 is released and under the action of the difference that has occurred, the valve 9 is detached from the seat 8, in conjunction with the inlet channel 3 with the output channel 1, which ensures the discharge of the working medium from the line to the working pressure in it.

As the pressure differential increases, the plunger AND comes off from the valve body 9, thereby increasing the flow area of the safety valve.

Claims (1)

Invention Formula A safety valve containing a lidded housing with an inlet and outlet channels, 30 0 five 0 five 0 in the cylindrical bore of which are placed the sealing elements and a spring-loaded locking member in contact with the floating seat, resting its side surface on the floating sleeve and provided with a throttle in its end part, the inlet channel communicating with the outlet through a throttle positioned in the end of the locking member and valve, characterized in that, in order to increase the reliability of operation, it is provided with an additional stepped bushing with radial holes installed external annular grooves are made between the floating seat and the floating sleeve, and on the ends of the floating sleeve and the floating seat facing each other, the floating sleeve and the floating seat are supported by the surfaces of their annular bores on the inner surfaces of the steps of the additional sleeve, and the sealing elements are placed between the ends of the additional sleeve and the ends of the annular bores of the floating sleeve and the floating seat.