A direct-acting relief valve

Abstract

The invention relates to a direct-acting overflow valve, comprising: a valve body, an intermediate body, a valve cover, a piston, a first spring base and a pressure regulating spring; the valve body includes a valve body body, and a valve body container inside the valve body cavity; the valve body body includes a base and a side wall integrally connected with the base; the base has an air inlet and an air outlet respectively communicated with the valve body cavity; the intermediate body is arranged on the side wall, and the intermediate body includes an intermediate body body and an intermediate The balance chamber inside the body body; the valve cover is connected with the intermediate body, and the cover is closed on the balance chamber; the valve cover has a limit ring; the piston includes a piston top and a piston bottom, and the inner center of the piston has a feedback hole; the piston bottom is set on Inside the cavity of the valve body; there is an air inlet channel on the bottom of the piston; the first spring base is arranged on the top of the piston, and is located below the limit ring at a certain distance; the bottom end of the pressure regulating spring is abutted on the first spring base, The top end abuts against the lower surface of the valve cover.

Description

technical field [0001] The invention relates to the technical field of relief valve devices, in particular to a direct-acting relief 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 intake 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 is opened, and the outlet 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 intake port of the direct-acting ...

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

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