Flow control valve

Abstract

Provided is a flow control valve that can effectively reduce the generation of noise due to fluctuations in the pressure or a refrigerant separation phenomenon that may occur while a refrigerant passes through the valve orifice, and also reduces the pressure loss and the like. The flow control valve (1) includes a valve body (5) including a valve chamber (6) and a valve orifice (10); and a valve element (30) with a curved surface portion (33) adapted to change the flow rate of a fluid through the valve orifice (10) in accordance with the lift amount of the valve element (30), the curved surface portion (33) having a curvature or a control angle that is increased continuously or in stages toward the tip end of the curved surface portion (33). The orifice diameter of the valve orifice (10) is sequentially increased in four or more stages in a direction away from the valve chamber (6). Further preferably, V2 > V4 > V3 > V1, where the volumes of the first valve orifice portion (11), the second valve orifice portion (12), the third valve orifice portion (13), and the fourth valve orifice portion 14 are V1, V2, V3, and V4, respectively.

Description

technical field [0001] The present invention relates to a flow regulating valve provided with a valve main body provided with a valve chamber and an orifice, and a valve core that changes the flow rate of the fluid flowing through the orifice according to the lift, and particularly relates to a heat pump type valve. A flow regulating valve suitable for regulating the flow of refrigerant in refrigeration and heating systems, etc. Background technique [0002] As the relationship between the valve opening (lift) and the flow rate of the flow regulating valve, that is, the flow characteristic, the linear characteristic and the equal percentage characteristic are well known. The linear characteristic refers to the characteristic that the change rate of the flow rate is constant relative to the change of the valve opening, and the equal percentage characteristic refers to the characteristic that the change rate of the valve opening is proportional to the flow rate. [0003] Fig...

AI Technical Summary

Problems solved by technology

[0005] Among the flow regulating valves 2 formed in such a way as to obtain equal percentage characteristics, such as Figure 5 As indicated by the bold arrow, when the flow direction of the refrigerant is from the valve chamber 6 to the valve port 15, the flow of the refrigerant along the curved surface 23 is prone to rapid pressure changes and refrigerant peeling when passing through the valve port 15. , vortex and cavitation are prone to occur and grow, while the problem of larger noise occurs

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