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Introduction of valve anti-corrosion lining materials

Cowinns Cowinns 2020-06-08 19:17:01
Introduction of valve anti-corrosion lining materials

1  PTFE (F4)

Applicable medium: strong acid, strong base, strong oxidant, etc.; operating temperature -200~180℃;

Features: It has excellent chemical stability, high heat resistance and cold resistance; the friction coefficient is very low, and it is an excellent self-lubricating material, but the mechanical properties are improved, the fluidity is poor, and the thermal expansion is large.

Ductile iron wafer butterfly valve can be lined with PTFE for acid mediums.

EPDM lined butterfly valve.jpg

2  FEP (F46)

Applicable medium: any organic solvent or reagent, dilute or concentrated inorganic acid, alkali, ketone, aromatic hydrocarbon, chlorinated hydrocarbon, etc.;

Operating temperature: -85~150℃;

Features: Mechanics, electrical properties and chemical stability are basically the same as F4, but the outstanding advantages are high dynamic impact, excellent weather resistance and radiation.

3  PCTEF (F3)

Applicable medium: various organic solvents, inorganic corrosive fluids (oxidizing acids);

Operating temperature: -195~120℃;

Features: heat resistance, electrical properties and chemical stability are second only to F4, mechanical strength, creep performance, hardness is better than F4.

4  Polyvinylidene fluoride PVDF (F2)

Applicable medium: resistant to most chemicals and solvents;

Operating temperature: -70~100℃;

Features: Tensile strength and compressive strength are better than F4, bending resistance, weather resistance, radiation resistance, light resistance and aging, etc. The biggest feature is that it can be good and easy to form.

5  Polypropylene RPP

Applicable medium: aqueous solutions of inorganic salts, dilute or concentrated solutions of inorganic acids and alkalis;

Operating temperature: -14~80℃;

Features: One of the lightest plastics, its yield, tensile and compressive strength, low-pressure polyethylene with uniform hardness, has a very outstanding rigidity; good heat resistance, easy to form, and cheap. The fluidity and bending elastic modulus are improved.

6  Polyene diameter PO

Applicable medium: acid and alkali salts of various concentrations and certain organic solvents;

Operating temperature: -58~80℃;

Features: It is currently the most ideal anti-corrosion material in the world, and it has been widely used in the lining of large-scale equipment and pipe fittings in rotary molding.

7  Polyvinyl chloride (hard) PVC

Applicable medium: water resistance, concentrated alkali, non-oxidizing acid, chain hydrocarbon, oil and ozone, etc.;

Operating temperature: 0~55℃;

Features: high mechanical strength, excellent chemical stability and dielectric properties, good oil resistance and aging resistance, easy welding and bonding, and reduced price.

Types of lined pipeline valves have the same nominal diameter of the shell and the same connection size, but the liner material according to different media, the following different liner materials can be used: modified PO, polypropylene RPP, perfluoroethylene propylene F46, poly four Vinyl fluoride F4, polytrifluoroethylene F3, polyvinylidene fluoride F2 and Viton lined butterfly valve can be used for diesel.