Flange Valve failure causes and solutions There are four, the most common symptoms, the valve is generally leaky flange parts, stuffing box leaks, sealing surface leakage, stem rotation is not flexible.
A/C Room Thermostat,Electric Water Heater Thermostat,Freezer Defrost Thermostat,Thermostat For Incubator
LONG TERM ELEC. CO., LTD , https://www.longterm-hvac.com