How to choose the right butterfly valve?

Plastic butterfly valve is a common fluid control device, widely used in industry, construction and agriculture. There are UPVC CPVC PPH PVDF PPH material butterfly valve. The handle lever butterfly size include DN50, DN65 DN80, DN100, DN 200, The worm geared butterfly valve include DN50 ~DN300. It has the advantages of simple structure, easy operation and corrosion resistance, so it is highly favoured by users. However, when buying plastic butterfly valve, we need to consider some important factors. This article will provide you with a plastic butterfly valve selection guide to help you choose the right product.

1, Chemical Compatibility:

Determine the specific chemicals or fluids the valve will be exposed to. Choose plastic materials for the valve body and components that are highly resistant to the corrosive effects of chemicals. Different plastics have varying degrees of resistance to different chemicals, so matching the material to specific chemical properties is critical.

2, Choose the right material:

Plastic butterfly valves are made of a wide variety of materials, commonly found in PVC (polyvinyl chloride), CPVC (chlorinated polyvinyl chloride), PP (polypropylene), PVDF (polyvinylidene fluoride) and PTFE (polytetrafluoroethylene)., etc. Different materials have different performance characteristics, so you need to choose the right material according to specific needs. Generally speaking, polypropylene is suitable for general medium, PVC is suitable for weak acid and alkali medium, PTFE is suitable for strong acid and alkali medium, and FRP is suitable for high temperature medium.

when selecting PVC, CPVC, PP or PVDF butterfly valves for different chemical applications, it is important to consider the chemical compatibility of each material. The following are general guidelines for the compatibility of these materials with various chemicals:

PVC (polyvinyl chloride) butterfly valve:

Suitable for treating water, acid (dilute), alkali and salt solutions.

Not recommended for use with strong acids, ketones, esters and aromatic or chlorinated hydrocarbons.

CPVC (chlorinated polyvinyl chloride) butterfly valve:

Resistant to a wider range of chemicals than PVC, including hot corrosive liquids, salts, and many acids and alkalis.

Not recommended for use with polar solvents, aromatic hydrocarbons and chlorinated hydrocarbons.

PP (polypropylene) butterfly valve:

Resistant to a variety of acids, alkalis and organic solvents.

Not recommended for use with strong oxidizing acids, chlorinated hydrocarbons, aromatic and halogenated hydrocarbons.

PVDF (polyvinylidene fluoride) butterfly valve:

Highly resistant to a wide range of corrosive chemicals, including strong acids, bases and halogenated solvents.

Suitable for handling corrosive chemicals and high purity applications.

Be sure to consult chemical compatibility charts and specific material data sheets to ensure the correct selection of PVC, CPVC, PP or PVDF butterfly valves for different chemical applications. Additionally, consider temperature and pressure conditions as well as regulatory and industry standards when making your selection.

3. Pay attention to the valve body structure:

Plastic butterfly valve body structure is also one of the factors to be considered when purchasing. Common valve body structure has flange type, threaded type and welded type. Flanged valve body is suitable for large diameter and high pressure occasions, threaded valve body is suitable for small diameter and low pressure occasions, welded valve body is suitable for high temperature and high pressure occasions. Therefore, you need to choose the right valve body structure according to the actual situation when purchasing.

4. Pay attention to the seat material:

The valve seat is an important part of the plastic butterfly valve, which directly affects the sealing performance of the valve. Common valve seat materials include EPDM (ethylene propylene diene monomer), Buna-N (nitrile rubber), fluoroelastomer (FKM、FPM、VITON), PTFE and polyurethane. FKM、FPM、VITON has good corrosion and abrasion resistance, PTFE has excellent corrosion and high temperature resistance, and polyurethane has good abrasion and oil resistance. .

These materials were chosen for their ability to provide a tight seal, wear resistance, and compatibility with a variety of fluids and temperatures. The specific materials used for plastic butterfly valve seats depend on the application, type of fluid being controlled, and operating conditions.

When purchasing, you need to choose the appropriate valve seat material according to the characteristics of the medium

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5, Pressure and Temperature Ratings:

Select valves that can handle the operating pressure and temperature conditions within the system to ensure safe and reliable operation.

Plastic raw material name and applicable temperature:

6, Size and Flow:

Select a valve size and flow that matches the system requirements to achieve the desired flow control.

7. Consider the operation mode:

Plastic butterfly valves are operated manually, electrically and pneumatically. Manual operation is simple, low cost, suitable for small systems; electric operation is convenient, high accuracy, suitable for large systems; pneumatic operation is fast, high degree of automation, suitable for systems that require frequent switching. Therefore, in the purchase of the need to choose the appropriate mode of operation according to the actual needs.

8. Pay attention to valve standards and certification:

In the purchase of plastic butterfly valves, you also need to pay attention to whether the valve meets the relevant standards and certification requirements. Common standards and certifications are ISO, CE, API and so on. Choosing products that meet the standards and certification requirements can ensure the quality and safety of the product. 

By carefully considering these factors, you can select a plastic butterfly valve suitable for handling different chemicals, ensuring safety, reliability and longevity in your application.