| 摘要 |
A thermostatic expansion valve has a valve shell, e.g., housing, with a high-pressure refrigerant passage and a low-pressure refrigerant passage. The high pressure refrigerant passage has a valve hole and a valve member that changes the valve hole opening rate. A pressure-operating chamber, which has an air-tight chamber and an equalizing chamber separated by a diaphragm, drives the valve member. This pressure-operating chamber, which is attached to the valve shell to detect the temperature, detects the temperature of gaseous phase refrigerant. The valve shell has a hole or opening extending through its outer wall. A plug member seals the hole after a heat-sensitive gas, which senses the temperature of the gas-phase refrigerant passing through the expansion valve, is introduced into the housing through the opening. The plug member is seated on the peripheral edge of the opening and welded to the opening peripheral edge by projection welding. An anti-corrosive material is applied to cover the welded area.
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