Butterfly Valve Seat Commonly Used Materials

The detachable face part in the valve is used to support the fully closed position of the valve core and form a sealing pair. For example, butterfly valves have a wide range of seat materials. Various rubber, plastic, and metal materials can be used as seat materials, such as EPDM, NBR, NR, PTFE, PEEK, PFA, SS315, STELLITE and so on. We introduce you the advantages of each of them.

EPDM

It has excellent weather resistance, ozone resistance, heat resistance, acid and alkali resistance, water vapor resistance, color stability, electrical properties, oil-filling and room temperature fluidity. Ethylene propylene rubber products can be used for a long time at 120℃, and can be used briefly or intermittently at 150- 200℃.

NBR

It is made from butadiene and acrylonitrile by emulsion polymerization method. NBR is mainly produced by low temperature emulsion polymerization method, with excellent oil resistance, high wear resistance, good heat resistance and strong adhesion. Its disadvantage is poor low temperature resistance, poor ozone resistance, poor electrical properties, slightly lower elasticity.

PTFE

Can be used continuously at 260℃, has a maximum operating temperature of 290-320℃, very low coefficient of friction, good wear resistance and excellent chemical stability. Can not be injection molding, can be extruded or do coating. PTFE unique properties make it in the chemical, petroleum, textile, food, paper, medicine, electronics and machinery and other industrial and marine operations have a wide range of applications.

Metal Seals

Metal seal valve seat material has good resistance to high temperature, high pressure, corrosion resistance, wear resistance and other properties, but the processing process requirements are relatively high, its biggest drawback is the long operation work is prone to leakage.

criteria

Valve seat material from LIWEI should meet the following criteria.

1) fluid compatibility, including expansion, hardness loss, permeability, degradation.

2) hardness.

3) permanent deformation.

4) the degree of recovery after load removal.

5) tensile and compressive strength.

6) deformation before rupture.

7) modulus of elasticity.

Triple Eccentric Metal Seal Butterfly Valve

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PTFE，commonly known as "Plastic King", is a high molecular polymer made by White waxy, translucent, excellent heat and cold resistance, and can be used for a long time at -180 to 260º C. This material is resistant to acids, alkalis, and various organic solvents, and is almost insoluble in all solvents. At the same time, PTFE has the characteristics of high temperature resistance, and its friction coefficient is very low, so it can be used for lubrication, and it has also become an PTFE has the characteristics of high temperature resistance, and its friction coefficient is very low, so it can be used for lubrication, and it has also become an ideal coating for easy cleaning of the inner layer of water pipes.

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