초록 ▼

An evacuation unit for testing the fluid tightness of a closed fluid system, filling the system with system fluid, and/or purging the system fluid of entrained gas. The evacuation unit includes a source of system fluid, an air operated venturi vacuum pump, a hose for releasable and sealable connecti

An evacuation unit for testing the fluid tightness of a closed fluid system, filling the system with system fluid, and/or purging the system fluid of entrained gas. The evacuation unit includes a source of system fluid, an air operated venturi vacuum pump, a hose for releasable and sealable connection to an access port of the closed fluid system, and a three way valve for selected positioning between a first position communicating the vacuum pump with the flexible hose system to produce a vacuum in the system, a second position isolating the flexible hose and system to test for fluid tightness, and a third position communicating the system fluid source with the flexible hose and system for filling the system through the access port with system fluid. A method of purging entrained gas from a closed fluid system as well as a method of testing the fluid tightness of the system and filling the system with system fluid without disconnecting the evacuation unit is also disclosed.

대표청구항 ▼

A method of testing the fluid tightness of a closed fluid system having an access port, comprising the steps of: draining the fluid system of the fluid therein; releasably and sealingly connecting a evacuation unit to the access port of the fluid system; actuating the evacuation unit to produce a va

A method of testing the fluid tightness of a closed fluid system having an access port, comprising the steps of: draining the fluid system of the fluid therein; releasably and sealingly connecting a evacuation unit to the access port of the fluid system; actuating the evacuation unit to produce a vacuum on the system to a predetermined pressure less than atmospheric pressure; discontinuing application of the vacuum on the system; observing any pressure increase that may occur; re-filling the system with system fluid after observing any pressure increase that may have occurred through the access port without disconnecting the evacuation unit, said step of re-filling comprises connecting the evacuated system to a source of system fluid which is at atmospheric pressure; disconnecting the system from the source of system fluid; and thereafter re-actuating the evacuation unit to produce a vacuum on the system to a predetermined pressure less than atmospheric pressure at a time prior to the system being completely filled with system fluid.