Fluid control valve and fluid control valve assembling method

Abstract

The object of the invention is to provide a fluid control valve for use under high-temperature conditions and capable of achieving high durability and Cv value stability even with many operations, anda method of assembling the fluid control valve. The fluid control valve includes an annular valve seat provided inside a body having an inflow port and an outflow port and a diaphragm opposed to theannular valve seat to be in contact therewith or away therefrom by an ascending / descending motion of an actuator rod or a manual rod. A contact surface, which is an upper surface of the annular valveseat, has a tapered surface formed along a centripetal direction of the annular valve seat.

Description

technical field [0001] The present invention relates to a fluid control valve and an assembling method of the fluid control valve capable of exhibiting the stability of Cv value variation with high precision even through a very large number of opening and closing operations in a high-temperature environment. Background technique [0002] Conventionally, as a fluid control valve used in a high-temperature environment, a so-called direct contact metal diaphragm valve is known. The thin film (metal diaphragm) is the valve diaphragm; in the state where the outer peripheral side is clamped between the valve body and the bonnet, the outer sealing part is formed in a ring shape around the valve chamber; the central part is passed by an actuator that is moved up and down, etc. The rod is pushed, and the upper surface of the annular valve seat provided on the periphery of the opening of the primary side flow path in the valve chamber is abutted and tightly contacted to close the valv...

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Problems solved by technology

[0015] On the other hand, in Patent Document 2, only the diaphragm side is considered, and as described above, the problem of further reducing the deterioration of the Cv value after many times of opening and closing in a high-temperature environment is solved by using a valve stroke adjustment mechanism. The proposal, regarding the valve seat that the inventors of the present application also focused on, mentions thermal expansion and aging, but there is no specific information on the valve seat and the diaphragm pressing part related to such problems or their mutual relationship. express

That is, the upper surface (engagement surface) of the valve seat in this document is only a narrow ring-shaped horizontal surface or a circular protrusion, and it is still unclear about the valve seat and the diaphragm pressing part and their relationship. get any insight

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