Break valve and its assembly method

Abstract

Provided is a cutoff valve which can simultaneously achieve highly reliable gas tightness, stable operation performance by small electric power, operation durability, and profitability. The inside pan shape portion of a metallic partition wall, a recessed portion formed on a lid made of a metal sheet, a tip end small diameter shaft and a small diameter groove formed on a metallic rotary shaft, and a plurality of metallic balls form rolling bearings for serving as both a radial bearing and a thrust bearing respectively, and hold the axis of a rotor. Because linear expansion coefficients of the rotary shaft and the holding member side are almost equal, possibility of the locking due to a temperature change is low, and the minimum radial clearance can be set. Because the accuracy of the axis of the rotor is high, stable operation performance can be achieved by small electric power, and high operation durability can be achieved by a rolling motion. Because the rolling bearings for serving as both the radial bearing and the thrust bearing are configured, high profitability can be achieved.

Description

technical field [0001] The present invention relates to a safety valve (International Patent Classification F16K31 / 04) using an electric motor as an operating device in a safety valve (International Patent Classification F16K17 / 36) that performs corresponding operations according to external conditions, in particular to a safety valve used to prevent gas accidents A circuit breaker used as a circuit breaker in a gas circuit breaker, and more specifically, relates to a valve body that moves back and forth relative to a valve seat provided in a flow channel to perform a circuit breaker / restoration operation of the flow channel and a power source Use the cut-off valve for the motor. Background technique [0002] In order to prevent gas accidents, various safety devices have been used for a long time. Wherein a kind of gas meter is called a microcomputer meter, which is driven by a battery power source, is equipped with a microcomputer, and is provided with a gas circuit breake...

AI Technical Summary

Problems solved by technology

Generally speaking, there will be residual distortion between the welded metal structures, prone to grain interface corrosion and stress corrosion, and there is a risk of cracking and damage

Once the welding part 54 is damaged, the

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