1. Virgin TFE Virgin TFE is a good all-around, general purpose seating material. TFE has outstanding resistance to chemical attack by a broad spectrum of organic chemicals, inorganic chemicals and solvents and is generally considered chemically inert. TFE is a selflubricating polymer with a very low coefficient of friction, which makes an excellent seating material…

Selection Valves serve the purpose of controlling the fluids in building services piping. Valves are produced in a variety of design types and materials. Proper selection is important to ensure the most efficient, cost-effective and long-lasting systems. Function Valves are designed to perform four principal functions: 1. Starting and stopping the flow 2. Regulating (throttling)…

1.Leakage of stuffing Causes: 1. Incorrect choice of stuffing: does not resist corrosion of medium, high pressure or vacuum of valve, high or low temperature; 2. Incorrect installation of stuffing: use small accessories instead of big ones, bad spiral contact, upper tight & lower loose; 3. Stuffing is beyond the lifetime so it is aged…