What's the difference between metal valve lining valves and metal valves?

Answer:

The lining is lined with plastic, rubber and other corrosion resistant material inside the valve body, or to ensure that the lining of the fluid is not contaminated. Generally used in the chemical industry more

metal valve refers to the valve is made of metal and its lining (sealing surface) may have its own processing, this form is called self sealing valve metal seal.

You said a little vague, do I understand the right: metal body lining valve is the valve body is a metal lining, and mostly refers to the sealing surface of the material, the material of metal and non-metallic parts, sealing surface of metal alloy steel, brass, hard alloy, under normal circumstances is welding up, after further processing;