The utility model relates to a back-pressure gaugevalve which is freeze proof and theft proof.
本实用新型涉及一种防冻、防盗回压表阀。
2
Metallurgical oxygen system pipe system, should use strict degreasing treatment, needle valve flange J29 Angle Pressure Gaugevalve connection.
冶金系统中的氧气管路系统中，宜选用经过严格脱脂处理，法兰连接的针型阀。
3
Before feeding water, air vent valves, pressure gaugevalve, water level gauge, burner supply valve and steam supply valve should be opened fully. Other valves and checking manhole close.