Geko Union/ Geko Fluid Control GmbH

What Are the Commonly Used Non-metallic Valve Materials?

1. Nitrile rubber valve material

Nitrile rubber valve materials are rated for temperatures ranging from -18°C to 100°C. It is an excellent general purpose rubber material for water, gas, oil and grease, gasoline (except gasoline with additives), alcohol and glycol, LPG, propane and butane, fuel oil and many other media. At the same time, it also has good wear resistance and deformation resistance.

2. Ethylene propylene rubber valve material

The rated temperature range of the ethylene propylene rubber seat is -28°C~120°C. Excellent ozone resistance and weather resistance, good electrical insulation performance, good resistance to polar solvents and inorganic media. Therefore, it can be widely used in HVAC industry, water, phosphate ester, alcohol, glycol, etc. Ethylene-propylene rubber seats are not recommended for use in hydrocarbon organic solvents and oils, chlorinated hydrocarbons, turpentine or other petroleum-based greases.

3. PTFE valve material

The rated temperature range of PTFE industrial valve material is -32℃~200℃. Excellent high temperature resistance and chemical corrosion resistance. Because PTFE has high density and excellent anti-permeability, it can also prevent corrosion from most chemical media. Conductive PTFE is a modified version of PTFE that allows current to pass through the lining thereby eliminating the insulating properties of PTFE. Because of its conductive properties, conductive PTFE cannot be tested for its quality by electric sparks.

4. Fluorine rubber valve material

The rated temperature of the fluororubber seat is -18°C~150°C. This material has high temperature resistance and excellent chemical resistance. Suitable for hydrocarbon products, low and high concentrations of mineral acids, but not for steam media and water (poor water resistance).

5. UHMWPE valve material

The rated temperature range of UHMWPE valve material is -32℃~88℃. This material has better low temperature resistance than PTFE, but still has excellent chemical resistance. Ultra-high molecular weight polyethylene also has good wear resistance and corrosion resistance, and can be used in high abrasive situations.

6. Silicon copper rubber valve material

Silicon-copper rubber is a polymer with organic groups whose main chain is composed of silicon-oxygen atoms. The rated temperature range is -100℃~300℃. It has good heat resistance and temperature resistance, excellent electrical insulation performance and high chemical inertness. Suitable for organic acid and low concentration inorganic acid, dilute alkali and concentrated alkali.

7. Graphite valve material

Graphite valve material is a crystal of carbon, a non-metallic material with silver-gray color, soft texture and metallic luster. It has unique physical and chemical properties such as high temperature resistance, oxidation resistance, corrosion resistance, thermal shock resistance, high strength, good toughness, high self-lubricating strength, strong thermal conductivity and electrical conductivity. It has special oxidation resistance, self-lubrication and plasticity at high temperature, and also has good electrical conductivity, thermal conductivity and adhesion. It can be used as a filler or performance improver for rubber, plastic and various composite materials to improve the wear resistance, compression resistance or conductivity of the material. Graphite is usually used to make valve gaskets, packing and valve seats.

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