A pilot-operated pressure reducing valve

Abstract

The invention discloses a pilot-operated type reducing valve, and relates to the technical field of valves. The pilot-operated type reducing valve comprises a main valve body and a pilot valve body. A main valve inlet communicates with a pilot valve inlet through a first pipeline. A flow speed control valve is mounted on the first pipeline and comprises a first connector, a second connector and a third connector, and the first connector, the second connector and the third connector communicate with the main valve inlet, the pilot valve inlet and an upper cavity of the main valve body. A throttle plate opened towards the third connector in a unidirectional manner is arranged among the third connector and the other two connectors. A throttle through hole is formed in the throttle plate. Due to the arrangement of the throttle plate in the flow speed control valve, the flow speed of a medium entering the upper cavity of the main valve body and the flow speed of a medium flowing out of the upper cavity of the main valve body are different; and when the main valve body is correspondingly closed and opened, sudden increase of the pressure of a main valve outlet can be avoided, and vibration, damage and even bursting of a pipeline connected with the main valve outlet are avoided.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a pilot pressure reducing valve. Background technique [0002] The pilot-operated pressure reducing valve uses the pilot valve to control the opening of the opening and closing parts in the main valve to adjust the speed of the medium and reduce the pressure of the medium. Keep it within a certain range. In the case of constant changes in the inlet pressure, keep the outlet pressure within the set range to protect subsequent living and production appliances. [0003] Such as figure 1 As shown, the structure of the existing pilot-operated pressure reducing valve mainly includes a main valve 1' and a pilot valve 2', and the main valve 1' is divided into an upper chamber 13' and a lower chamber 14' by the main valve diaphragm. A pilot valve inlet and a pilot valve outlet are arranged below the pilot valve diaphragm, the pilot valve inlet is connected to the main valve inlet 11', th...

AI Technical Summary

Problems solved by technology

[0004] When the pressure at the outlet 12' of the main valve suddenly rises sharply for some reason, since the pressure water flow between the inlet 11' of the main valve and the inlet of the pilot valve is constant, the closing speed of the opening and closing parts of the main valve is relatively fixed, and the outlet 12 of the main valve 'The connected pipeline will cause pipeline vibration due to a sharp rise in pressure, damage the pipeline fittings, and even cause the pipe to explode

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