Balance valve used for gas pressure regulating valve

Abstract

The invention discloses a balance valve used for a gas pressure regulating valve and relates to a balance valve on a gas pressure regulator. The balance valve used for the gas pressure regulating valve comprises a valve seat; a shaft sleeve is arranged inside the valve seat; a valve rod is arranged inside the shaft sleeve; a valve element is arranged on the valve rod; the valve element is in sealed contact with the valve seat; a closed cavity is formed between the valve element and the valve seat; the valve element is provided with a screw matched with the valve rod; a first channel communicating with the outside is formed inside the screw; a second channel communicating with the closed cavity is formed inside the valve rod; and a steel ball is movably arranged between the first channel and the second channel. Compared with the prior art, the balance valve used for the gas pressure regulating valve has the beneficial effects that the valve element always keeps stress balance through fine motion of the steel ball in the valve element during pressure regulation, the mutual interference between inlet pressure P1 and outlet pressure P2 is reduced, and accordingly impact to an adjusting component during pressure regulation is eliminated, slight trembling of the adjusting component is reduced, and the problem that the valve element is stressed unevenly during pressure regulation to cause surging in the prior art is solved.

Description

technical field

[0001] The invention relates to a balance valve on a gas pressure regulator, in particular to an anti-surge balance valve for a gas pressure regulator. Background technique

[0002] The gas pressure regulator, commonly known as a pressure reducing valve, is a device that keeps the outlet gas at a specified pressure by automatically changing the gas flow through the regulating valve. The basic function of a pressure regulator is to maintain the system pressure within an acceptable range while meeting downstream flow requirements. At low flow rates, the regulator disc closes to the seat, narrowing the passage to restrict flow. When the demand flow increases, the valve disc moves away from the valve seat, increasing its opening degree and increasing the flow rate. Ideally, a regulator should be able to deliver a constant downstream pressure while delivering the required flow. From the point of view of fluid mechanics, the pressure regulator is a throttling el...

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