... and operation4. Rotary parts are well protected for safety.H. Features1. Vacuumize and check vacuum pressure for ... relief valve and liquid level monitor;K. Gas retrieving systemIt is composed of air compressor, bumper, separator, filter, heat exchanger, safety valve, one-way valve ... 1.5), vacuum gauge, process diagram and operation guide, valve number, and inlet and outlet indicator.P. InstrumentsII. ...