Fluid reversing valve

Abstract

A three-port fluid selector valve allows fluid which has flowed from an inlet port 41 into a valve chamber 12 in a valve casing 1 to flow out of two outlet ports 42 and 43. Valve seats 13 and 31 communicating with the respective outlet ports are provided to opposite walls of the valve chamber 12 facing each other and a poppet-type valve body 5 for being selectively seated on the valve seats to connect the inlet port to one of the outlet ports and to close the other of the outlet ports is disposed in the valve chamber. The valve seats are formed in recessed shapes in the valve chamber 12 and provided to inner bottom portions of valve seat holes 17 and 18 having depths in which at least a half of a thickness of the valve body 5 at a periphery of the valve body 5 is embedded and suppresses reduction of the flow coefficient.

Description

technical field [0001] The invention relates to a 3-way fluid reversing valve, in particular to a fluid reversing valve which is compact in structure and has a large flow coefficient. Background technique [0002] In the conventionally known 3-way fluid selector valve, the fluid (liquid) flowing into the valve chamber from the inlet hole is switched to flow out to the two holes on both sides. This kind of fluid reversing valve is provided with valve seats leading to two holes on the opposite walls on both sides of the valve chamber where the fluid flows from the inlet hole, and a poppet valve body is arranged in the valve chamber, and the valve body selectively enters To these valve seats, the inlet hole communicates with the hole on one side while closing the hole on the other side. Such fluid diverter valves have the following problems. [0003] That is, in the above-mentioned fluid switching valve, in order to increase the flow rate without enlarging the shape, it is ge...

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Problems solved by technology

[0003] That is, in the above-mentioned fluid switching valve, in order to increase the flow rate without enlarging the shape, it is generally considered to increase the flow path from the inlet hole to the valve chamber and the cross-sectional area of ​​the valve chamber itself within the possible range, but according to various experiments According to the results, it is known that arbitrarily expanding the flow path can form a stagnant flow part and a turbulent flow part caused by a sharp change in the cross-section of the flow path. Therefore, the effectiveness of increasing the flow rate decreases, and even negative effects occur.

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