Belfield Valve sizing and performance data
Belfield Valve sizing is based on the complete process duty, including liquid densities, temperature, viscosity, available head, required flow rate and installation arrangement. PMA uses these conditions to select the valve size and float ballast needed for dependable phase detection.
Specify the duty, not just the pipe size
Belfield Valve performance is established from the real process conditions. PMA uses the liquid properties and installation data to select the valve size and float ballast for dependable interface detection.
- Normal published capacity applies up to 80°C
- From 80–95°C, nominal capacity is reduced by 25%
- Viscosity up to 50 cS has little or no effect
- From 50–100 cS, nominal capacity is reduced by 25%; consult PMA above 100 cS
For duties outside these ranges, PMA will review the full application before recommending a configuration.
Configured around the liquid interface
Flow, head, temperature and specific gravity are considered together—not as isolated values.
Key design figures
These figures describe the standard design basis. Final selection is confirmed against your process data.
5% average
Typical minimum specific-gravity difference used when assessing dependable phase detection.
75 psig
Standard design pressure for routine Belfield Valve applications.
112.5 psig
Standard hydrostatic test pressure used to verify pressure integrity.
Send PMA your process data for sizing
Share the liquid properties, operating temperature, available head and required flow rate. Our team will recommend the appropriate valve size and ballast arrangement.
Let’s talk about your application.
Speak to the PMA team about your Belfield Valve requirements. Tell us about your liquid-separation duty, and we’ll help you find the right next step.
- Advice for your application. Discuss the liquids, flow rate and operating conditions for your process.
- Practical valve support. Get help with sizing, installation, maintenance and replacement parts.
- Clear next steps. Request a quotation or a callback, with your site and application in mind.
- An enquiry, not a mailing list. Your details are used to respond to your enquiry.
Belfield Valve customers
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You can also email sales@pma.uk.com.
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