RU194451U1 - Overpressure valve - Google Patents

Abstract

The overpressure valve refers to pipe fittings and is designed to automatically maintain vacuum in rooms by flowing air from one room to another in only one direction and for emergency shutoff of the pipeline from the room when the pressure rises sharply above a certain threshold value in the pipeline. The valve remains operational and performs its functions under normal conditions of operation, violations of normal operation, design basis accident. The purpose of the proposed utility model is to increase the reliability of the valve, ease of assembly and cheapening of the design. The technical result is to develop a valve with a minimum number of machined elements, allowing to work with low pressures (20-100 Pa), having increased seismic resistance due to the rejection of needle support elements, exceptionally the probability of the formation of an air cushion arising in the event of a sharp increase in pressure in the room, which can be used both on horizontal branches of pipelines and on vertical ones. The goal is achieved by the fact that the plate is equipped with a rod on which the guide element is rigidly fixed, while the rod contains a cap and an adjusting nut, which provides the possibility of installation movement of the plate to the "closed" position and the transition to the "open" position, while the working hole with a locking body can be full at the end of the valve.

Description

The overpressure valve (hereinafter referred to as the valve) refers to pipeline valves and is designed to automatically maintain vacuum in rooms by flowing air from one room to another in only one direction and to shut off the pipeline from the room when the pressure rises sharply above a certain threshold value in the pipeline. The valve remains operational and performs its functions in normal operation, violations of normal operation, design basis accident.

A known design of Δ. The valve comprises a housing with coaxial working nozzles with an internal cavity, in which a spring-loaded locking element is mounted, mounted on a guide support element with the ability to move against the spring force and has a thrust surface for the spring, while the internal cavity of the housing is divided by a transverse partition with a through axial hole, a guide the supporting element is rigidly fixed in the housing, the locking element has an H-shape with a blind central hole for placement of a guide supporting lementa to form a damping chamber between it and the bottom of the hole, the working surfaces of the blocking member placed on either side of the partition to overlap its axial hole.

This known design has several disadvantages:

- the valve is designed to work with high pressures, the presence of friction between the axis and the cup of the shut-off member will not allow operation at a pressure drop of 20-100 Pa;

- the complexity of the design due to the presence of a significant number of machined elements, for the connection of which each other requires high-precision surface treatment;

- the difficulty of adjusting the fit of the locking body to the sealing element. The axis on which the locking element is fixed acts as a console. The axis must be precisely centered relative to the through hole in the housing. The non-concentricity of the axis and the hole leads to a bias of the locking element, and as a result, the uneven fit of the latter to the sealing element;

- with a sharp increase in pressure in the room, the damping chamber can work as an air cushion, and the locking element does not have time to close the hole in the housing in time.

The closest technical solution is патент. The valve comprises an annular flange with a base and a locking element made in the form of a plate with a sealing element located on the periphery, a lever with a counterweight mounted on one end, which can be moved along the lever, and the other end of the lever is connected through a shaft to the plate, and the shaft is made with the hinge element at the end, and the lever is connected with the supporting elements of the base, while the hinge element is made at the end associated with the plate, in the form of a self-aligning bearing, and the shaft is made with the possibility of it axial mounting movement in the lever, the supporting elements are made in the form of sliding or rolling bearings, while the counterweight is made with an eccentric hole with which it is mounted on the lever with the possibility of axial and rotational mounting movements.

The prototype device has the following disadvantages:

- the complexity of the design due to the presence of a significant number of machined elements, for the connection of which each other requires high-precision surface treatment;

- the difficulty of adjusting the fit of the plate to the body and adjusting the lever for installing needle bearings;

- the possibility of using the valve in only one vertical position;

- low seismic resistance due to the use of needle supports, the presence of cantilevered counterweight elements, which with seismic shocks can damage the valve.

The purpose of the proposed utility model is to increase the reliability of the valve, ease of assembly and cheaper design.

The technical result is the development of a valve with a minimum number of machined elements, which allows working with low pressures (20-100 Pa), which has increased seismic resistance due to the rejection of needle support elements, eliminating the likelihood of an air cushion arising in the event of a sharp increase in pressure in the room, which can be used both on horizontal branches of pipelines, and on vertical ones.

The problem is solved in that the plate is equipped with a rod, on which the guide element is rigidly fixed, while the rod contains a cap and an adjusting nut, which enables the installation movement of the plate to the “closed” position and the transition to the “open” position, while the working hole has a locking body can be performed in the end part of the valve.

The essence of the utility model is illustrated by drawings:

in FIG. 1 is a perspective view of the valve in isometric form (locking member in the side);

in FIG. 2 - view of the valve on the left;

in FIG. 3 - section AA in the closed position;

in FIG. 4 - section AA in the "open" position;

in FIG. 5 is a perspective view of the valve in isometric form (locking element in the end part);

in FIG. 6 is a top view of the valve;

in FIG. 7 - section BB in the closed position;

in FIG. 8 - section BB in the open position.

The valve 1 comprises a housing 2 with flanges 3, a working hole, a spring-loaded locking element, made in the form of a plate 4 with a sealing element 5 located on the periphery (see Fig. 3, 4, 7, 8).

The valve 1 is equipped with a guide element 6, which holds the stem 7 with the plate 4 from distortions. On the stem 7 of the plate 4 is installed a compression spring 8 for smooth opening and closing of the valve 1 (see Fig. 1-8).

The rod 7 is equipped with a cap 9 to protect the spring 8 from contamination and an adjusting nut 10, with which the plate 4 is set to the "closed" position and switches to the "open" position at a pressure of from 20 to 100 Pa (see Fig. 1-8) .

The valve 1 can be made with a working hole and a locking body in the form of a plate 4 in the end part (see Fig. 5-8).

Valve 1 operates as follows: during normal operation, air from the room acts on the plate 4 of valve 1 with a pressure of 20 to 100 Pa. Using the spring 8, the plate 4 is displaced relative to the housing 2 along the axis of the rod 7, opening the valve 1 for the flow of air from the room into the piping system. In case of violation of normal operation and design basis accident in case of excessive return flow, the plate 4 is tightly pressed against the housing 2, blocking the release of radioactive air into the room from the piping system.

This technical solution improves reliability, provides ease of assembly and cheaper construction.

This technical solution allows you to work with low pressures (20-100 Pa), has increased seismic resistance and eliminates the likelihood of an air cushion that occurs in the event of a sharp increase in pressure in the room.

Such a technical solution can be applied both on horizontal pipelines and on vertical ones.

Claims (2)

1. An overpressure valve comprising a housing with flanges, a working hole, a spring-loaded shut-off element, made in the form of a plate with a sealing element located on the periphery, characterized in that the plate is equipped with a rod on which the guide element is rigidly fixed, while the rod contains a cap and an adjusting nut, which enables the installation movement of the plate to the "closed" position and the transition to the "open" position. 2. The overpressure valve according to claim 1, characterized in that the working hole with a locking element is made in the end part of the valve.

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