Diffuser for fluid control valve and fluid control valve

Abstract

There is provided a diffuser for fluid control valve and a fluid control valve capable of preventing or depressing cavitation phenomenon practically and depressing the reducing of the maximum flux. The diffuser 31, which is mounted inside the peristome in downstream side of the valve body 2, reduces the flow velocity of a liquid 30 and then transfers kinetic energy into pressure. The diffuser 31 is shaped as a hollow conical body with an opening bottom 34, wherein the internal angle (theta) of the top 33 is smaller than 90 DEG and a plurality of pinholes 32 is formed on side walls.

Description

technical field [0001] The present invention relates to a diffuser for a fluid control valve and a fluid control valve which decelerate the flow of fluid and convert kinetic energy into pressure. Background technique [0002] In the fluid control valve that controls the flow rate and pressure of the fluid to be controlled, when the fluid pressure is significantly reduced or the flow rate is fast, abnormal flow will occur due to the flow disorder that occurs in the throttling part of the valve. High noise, or generation of cavitation, etc. In this case, vibration and noise are likely to occur in the compressive fluid, and cavitation is likely to occur in the incompressible fluid. Once the cavitation occurs, it will cause flow reduction, valve corrosion (cavitation erosion), vibration, noise, etc., resulting in a significant decrease in valve performance, durability, and the like. [0003] Therefore, as the prior art for preventing the occurrence of the above-mentioned cavit...

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Problems solved by technology

[0008] In the fluid control valve described in Patent Document 2, since the fluid flow direction is converted into a substantially right-angled direction, the fluid flows into the cylindrical protrusion of the case body through the second hole, so that the maximum flow rate of the valve decreases, The problem that the valve must be enlarged to increase the maximum flow rate

Moreover, since the flow velocity of each hole in the cylindrical part is not uniform, the effect of suppressing cavitation is also small.

[0009] In the vapor shift valve described in Patent Document 3, since the top of the cover-shaped diffuser has a relatively large inner angle, it suffers from the cavitation phenomenon similar to the diffuser composed of a flat perforated plate described in Patent Document 1. Problems that occur with little effect on suppression or prevention

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