... : Linear, Equal-percentage, Quick-openPneumatic control valves are intended for general utility service in pressure, flow, and temperature control applications ... convenience and easy maintenance.3.The mental valve core structure for many work situation up to scratch 6 leak standard , ... materialWCB,304,316,WC6,WC9,Ti,Ni,Hastelloy,Monel etc.Flug materials304,316,420,Ti,Ni,Hastelloy,Monel etc.Working TEM- ...