How do I choose the size of a butterfly valve?

Match the nominal valve size to the pipe size, then check the required flow, allowable pressure loss, pressure class, flange standard and face-to-face space. Pipe size alone is not enough for a final selection.

What determines butterfly valve actuator torque?

Required torque depends on valve size, differential pressure, seat friction, medium, operating frequency and safety margin. The complete torque calculation should be confirmed for the actual service condition.

Which seat material is suitable for a butterfly valve?

Seat material must be compatible with the medium, temperature and shut-off requirement. EPDM is commonly used for compatible water service, while other elastomers or metal seats may be needed for different conditions.

What information should be included in a butterfly valve RFQ?

Include size, pressure rating, flange standard, medium, temperature, body and disc material preference, seat material, actuator type, control voltage or air supply, quantity and certificate requirements.

Butterfly Valve Size and Torque Selection Guide

Butterfly valve selection begins with the actual pipeline duty: nominal size, medium, pressure, temperature, connection standard and required operating method. A correctly specified valve package helps avoid insufficient torque, unsuitable sealing materials and installation mismatches.

1. Confirm the line size and connection standard

Start with the pipe nominal diameter and flange standard. Confirm whether the project requires wafer, lug or flanged construction, as well as the pressure class and available face-to-face installation space. For replacement projects, compare the existing valve dimensions and drilling standard before ordering.

2. Match materials to the medium

Selection item	What to confirm
Body and disc	Corrosion resistance, mechanical strength and project material standard.
Seat	Compatibility with medium, temperature, shut-off requirement and expected operating cycles.
Stem and fasteners	Corrosion exposure, marine environment and maintenance requirement.

For water, seawater, gas, slurry or chemical duty, specify the actual medium and concentration. Final material selection should be confirmed against the project datasheet and operating limits.

3. Select manual, pneumatic or electric operation

Manual gear operation is often suitable for accessible valves with lower operating frequency. Pneumatic actuation supports fast remote operation and defined fail positions. Electric actuation is useful where electrical control and position feedback are required. In every case, actuator torque must account for valve break torque, differential pressure, seat friction and a practical safety margin.

4. Prepare a complete RFQ

Send the valve type, DN/NPS size, pressure rating, flange standard, medium, temperature, body/disc/seat materials, actuator requirement, quantity, destination and required certificates. A drawing or line list enables faster technical confirmation.

Need help sizing a butterfly valve?

Jinkon supports butterfly valve selection, actuator matching, drawings and export documentation for industrial and marine projects.

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