RU16779U1 - SAFETY VALVE - Google Patents

Abstract

Safety clan

The utility model relates to hydraulic fittings and can be used to prevent the increase of pressure in excess of the pressure set in serviced systems. The safety valve includes a housing with inlet and inlet channels and a spring-loaded locking element installed in the housing with the possibility of interaction with the seat of the inlet channel. The stiffness of the spring is adopted corresponding to the following ratio:

C (0.8-1.2) C-spring stiffness kgf / ml1,

P „- valve opening pressure kgf / cm,

dc - inner diameter of the input channel seat

abstract

Description

iniil lit tarn c. ... gf Security clan

The utility model relates to hydraulic valves and can be used to prevent the increase in pressure above that established in the systems being serviced.

Known direct-acting safety valves containing a housing with inlet and outlet channels and a spring-loaded locking element located in the housing with the possibility of interaction under the force of a spring with an inlet drip seat (RU, 2086845 class. R16K17 / 06, 1997; FR, 2193164, class. P16K17 / 32, 1994). The closest in number of matching signs to the claimed is a safety valve (RU, utility model No. 9038, class P16K 17/06, 1999), also containing a housing with inlet and outlet channels, a spring-loaded locking orgap located in the housing adjacent to the sealing element interacting under the force of the spring with the saddle of the inlet channel, and the size of the sealing element is connected by a certain ratio with the inner diameter of the saddle.

The productivity and accuracy of operation of the above-mentioned valves varies widely depending on the design features, in particular, on the choice of a spring with a certain stiffness. The parameters of the spring also affect the magnitude of the oscillations of the shut-off element during the valve actuation, and the calculation errors force the grinding of the spring ends or the installation of washers between the spring and the body when adjusting the valve to the nominal pressure. This method of tuning is time-consuming, requires disassembly of the valve and does not provide the required accuracy.

This utility model solves the problem of creating a direct-acting safety valve in which the spring stiffness is selected so that the maximum response accuracy and performance would be achieved without the laborious fitting and adjustment of the shut-off element assembly with a simultaneous increase in valve reliability under fluctuating operating temperature.

The problem is solved in that in the safety valve, comprising a housing with inlet and outlet channels and a spring-loaded shut-off element placed in the housing with the possibility of interaction with the seat of the input channel, the stiffness of the spring is adopted corresponding to the following ratio:

F16K17 / 04

C-spring stiffness kgf / mm,

Pressure of valve opening kgf / cm,

d, - inner diameter of the inlet seat saddle mm

This experimentally obtained ratio makes it possible to achieve a balance between the action of the working medium on the valve shut-off element and the force exerted by the spring, and within the specified interval, adjust the valve, taking into account that a decrease in spring stiffness leads to an increase in valve productivity, and an increase in stiffness leads to a reduction response pressure.

The utility model is illustrated by the description and the attached drawing, which shows a longitudinal section of the safety valve.

The valve comprises a housing 1 with an inlet 2 and an outlet 3 channels. In the housing, with the possibility of interaction with the seat 4 of the input channel 2, a shut-off element is arranged in the form of a spool 5, spring-loaded in the direction of the seat with a spring 6, resting it on the supports 7. The spring stiffness is adopted according to the following relation:

C (0.8-1.2) Moo

C-spring stiffness kgf / mm,

Table of contents of valve opening kgf / cm,

dc - inner diameter of the input channel seat

The safety valve operates as follows.

The force of the compressed spring 6 presses the spool 5 to the seat 4. When the working fluid pressure exceeds the calculated value of the valve operating pressure, the spool is affected by the force compressing the spring, and the passage for the working medium opens. After reducing the pressure at the inlet of the valve, the spool under the action of the spring force is again trimmed against the seat, blocking the path to the working medium.

The utility model can be used in tanks, vessels, tanks and pipelines for automatic discharge of the working medium (gas, liquid) into the atmosphere or bypass pipe. The safety valve can be used in the gas and oil industry, as well as in other sectors of the economy.

Claims (1)

The safety valve, comprising a housing with input and output channels and a spring-loaded shut-off element placed in the housing with the possibility of interaction with the seat of the input channel, characterized in that the spring stiffness is adopted corresponding to the following ratio:

where C is the stiffness of the spring, kgf / mm;
P _n - valve opening pressure, kgf / cm ² ;
d _with - the inner diameter of the seat of the inlet channel, mm