electric drive valve

Abstract

A valve body of a solenoid valve (1) is formed by jointing a second valve body (10) and a first valve body (4) through fusion welding. Pipes (30, 32) are jointed with the second valve body through brazing (R). A valve core (50) is guided to slide by an internal circumferencial surface (42) of the first valve body (40). The first valve body (40) is not influenced by thermal deformation of brazing (R), so that good sliding performance of built-in components is guaranteed. According to the electric driving valve, thermal deformation of the sliding surface is avoided when the pipes are jointed with the valve body through brazing.

Description

technical field [0001] The invention relates to electrically driven valves such as solenoid valves and electric valves. Background technique [0002] In the solenoid valve and the electric valve, a spool is accommodated inside a cylindrical valve body. Furthermore, the movable element that drives the spool has a structure in which a plunger and a rotor are arranged inside the valve body, and the spool is operated through the movable element by an electromagnetic drive unit such as a stator installed outside the valve body. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open No. 2004-263823 [0006] The problem to be solved by the invention [0007] Such an electrically driven valve has two or more piping members fixed to the valve main body. [0008] As a method of fixing pipe members, brazing is widely used because it is advantageous in terms of cost. Brazing, furnace brazing technology is used in large-scale i...

AI Technical Summary

Problems solved by technology

[0009] However, the brazing method heats the valve body and piping components to high temperatures, so the valve body, which is a metal part, is prone to thermal deformation.

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