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Direct acting type overflow valve

A direct-acting overflow valve and valve body technology, which is applied in safety valves, balance valves, valve devices, etc., can solve the problems of large pressure regulation deviation, poor stability, and low control accuracy

Active Publication Date: 2020-10-20
CRRC QINGDAO SIFANG ROLLING STOCK RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, the greater the setting force (stiffness) of the pressure regulating spring of the direct-acting relief valve, the greater the pressure regulation deviation, the worse the stability, and the lower the control accuracy

Method used

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  • Direct acting type overflow valve

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Embodiment Construction

[0029] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0030] The direct-acting overflow valve provided by the embodiments of the present invention can be used in the braking system of rail transit vehicles to maintain the normal operation of the braking system and play a role in safety protection for the braking system. It should be noted that the compressed air of the direct-acting relief valve in the embodiment of the present invention is input from the air source of the braking system.

[0031] figure 1 The cross-sectional view of the direct acting overflow valve provided for the embodiment of the present invention, as figure 1 As shown, a direct-acting overflow valve includes: a valve body 1 , an intermediate body 2 , a valve cover 3 , a piston 4 , a first spring base 5 and a pressure regulating spring 6 .

[0032] figure 2 Schematic diagram of the structure of th...

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PUM

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Abstract

The invention relates to a direct acting type overflow valve. The overflow valve comprises a valve body, an intermediate, a valve cover, a piston, a first spring base and a pressure adjusting spring;the valve body comprises a valve body main body and a valve body containing cavity inside the valve body main body; the valve body main body comprises a base and a side wall which is connected with the base in an integral mode; the base is provided with an air inlet and an air outlet which communicate with the valve body containing cavity respectively; the intermediate is arranged on the side wall; the intermediate comprises an intermediate main body and a balance chamber inside the intermediate main body; the valve cover is connected with the intermediate main body and is covered on the balance chamber; the valve cover is provided with a limiting ring; the piston comprises a piston top and a piston bottom; a feedback hole is arranged at the center inside the piston; the piston bottom is arranged in the valve body containing cavity; an air inlet passage is formed in the piston bottom; the first spring base is arranged at the piston top and is positioned below the limiting ring with a certain gap from the limiting ring; and the bottom end of the pressure adjusting spring abuts against the first spring base and the top end abuts against the lower surface of the valve cover.

Description

technical field [0001] The invention relates to the technical field of overflow valve devices, in particular to a direct-acting overflow valve. Background technique [0002] The relief valves used in the braking system of rail transit vehicles are all direct-acting relief valves. The working characteristic of the direct-acting relief valve is that when the piston thrust generated by the compressed air at the inlet port of the direct-acting relief valve is greater than the set pressure of the pressure regulating spring, that is, the initial spring force, the piston leaves the valve seat, the valve port opens, and the valve exits. The air port is connected to the air inlet; when the piston thrust generated by the compressed air at the air inlet of the direct-acting relief valve is less than the set pressure of the pressure regulating spring, the valve port is closed, and the air outlet and the air inlet are cut off. [0003] If the pressure at the air inlet of the direct-acti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B13/02F16K17/06
CPCF15B13/02F16K17/06
Inventor 黄士伟郭宗斌彭林王令军刘运东张志强吴学瑞
Owner CRRC QINGDAO SIFANG ROLLING STOCK RES INST