Reducing noise in a thermal expansion valve

摘要

A thermal expansion valve for controlling flow of refrigerant from a high pressure (condenser) inlet to a low pressure (evaporator) outlet. The main valve is operated by pressure in a temperature sensing fluid filled capsule acting on a diaphragm connected to a valve operating rod. Upstream of the main valve, mounted on the same block is a solenoid operated shutoff valve. A first noise reducing restricting orifice is disposed in the high pressure inlet upstream of the shutoff valve. A second noise reducing restricting orifice is disposed in the shutoff valve which is preferably pilot operated.