SU1634922A1 - Safety valve with bellows - Google Patents

Abstract

This invention relates to archatching. The purpose of the invention is to increase the reliability of the safety valve by reducing the influence of the rigidity of the snfone. In housing I there is a spool 4 connected to the stem 2 movably mounted in sleeve 6. Inside sleeve 6 there is a bellows 8, around which guide 5 is installed. In sleeve 6 there is a piston ring 7. The cavity between guide 5 and the bellows 8 is communicated with the output. I il

Description

The invention relates to a thermal structure (to safety valves) and can be used in those branches of the national economy that require an increased hope of protecting an object from overpressure combined with absolute tightness of the valve in relation to the external environment.

The aim of the invention is to nOjjb the reliability of operation by reducing the effect of the rigidity of the sylph.

The drawing schematically depicts the valve section.

The valve consists of a housing 1, which houses the rod 2 through the ball 3 in contact with the spool 4, the guide 5 along which the bellows sleeve 6 moves with the piston ring 7, the bellows 8, sealing the cavity 9 with respect to the external environment. Meldu with a cover 10 and a case is located a disk 11, to which the upper horses of the bellows 8 are attached, on

stem G transmits 1 force of spring 12 adjusted by adjusting screw 13, guide 5 connected to the cavity of outlet nozzle 14 by tube 15. The medium is fed into the valve through inlet nozzle 16, in the upper part of which saddle 17 is located.

The valve operates as follows.

In normal operation, the force from the pressure of the working medium on the rake 4 is balanced by the force of the spring and the valve is closed. At this point, the pressure behind the valve closure (behind the ylotnik) is equal to the pressure in the outlet pipe.

When the pressure at the inlet of the adjusted valve is exceeded, the valve opens and relieves pressure to the amount of the return fit, after which the valve closes. Due to the piston ring 7, the pressure in the cavity 9, i.e. the pressure acting on the bellows 8 is practically not increased, while in the rest of the body

(L

05

with

J

from th

N3

pressure is 0.5-0.3 working (inlet pressure).

Thanks to the drastic expansion of the medium in the outlet nozzle, the pressure therein drops significantly and in most cases becomes equal to the pressure in the discharge system. If the environment is discharged into the atmosphere, the excess pressure on the bellows is almost equal to 10 but zero.

In cases where the discharge from the safety valve goes into a system with high back pressure and the medium is not toxic or very low.

0

five

horn, then cavity 9 can be connected to the atmosphere.

Claims (1)

Claims of Invention A safety bellows valve comprising a spool placed in a housing associated with a rod movably mounted in a sleeve inside which a bellows is placed, which means that, in order to increase reliability of operation, a guide is installed around the bellows. and in the sleeve there is a piston ring, with the cavity between the guide and the bellows communicating with the valve outlet. Editor L. Veselovska Compiled by L.Semenov Tehread M.DndykKorrektor V.Girn to Order / 4 3 Circulation 440 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Space and Technology of the USSR 4/5, Moscow, Zh-35, Raushsk nab. 113035 Subscription