A filter pressure reducing valve

Abstract

The invention discloses a filter decompression valve, which comprises a valve body, the left and right sides of the valve body are respectively provided with a high-pressure inlet and a low-pressure outlet; a pressure regulating assembly: the pressure regulating assembly is arranged at one end of the valve body , the valve body and the pressure regulating assembly are separated into a diaphragm chamber and a valve core chamber by a diaphragm assembly, and the valve core in the valve core chamber presses against the diaphragm assembly in the diaphragm chamber to realize the diaphragm Opening and closing connection between the film cavity and the valve core cavity; the diaphragm assembly is provided with a groove at the connection with the valve core, and an air flow is provided between the valve core and the inner peripheral surface of the groove. Through the gap, a seal is provided between the valve core and the diaphragm seat. The air-tight structure of the pressure reducing valve can ensure the airtightness of the pressure reducing valve, and at the same time, the pressure can be reset accurately. Widely used in various pneumatic systems.

Description

technical field [0001] The invention relates to a decompression valve used in a pneumatic circuit, in particular to a filter decompression valve. Background technique [0002] In the pneumatic system, the filter pressure reducing valve can filter the gas and stabilize the pressure to keep the gas pressure in a constant state, reducing the damage to hardware such as valves or actuators due to sudden changes in the gas source pressure. The existing filter pressure reducing valve has the problem of poor airtightness. The reason is that the valve core of the pressure reducing valve and the diaphragm seat are airtightly matched. The existing valve core is generally made of rigid materials. The cylindrical valve core rod and the semi-spherical valve core head made of elastic material are fixedly connected, and a semi-spherical groove matching the valve core head is formed on the diaphragm seat. This air-tight fit method requires high machining accuracy of the valve core head, and...

AI Technical Summary

Problems solved by technology

This air-tight structure also has the following defects: 1. The upper part of the valve core is close to the diaphragm seat, and there is no gap on the mating surface. When the pressure regulating spring resets to zero, the pressure of the pressure reducing valve cannot be returned to zero; 2. The structure of the diaphragm seat is complex and the processing cost is high

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