Help retain a separate unwanted product phase before it reaches downstream effluent treatment.
During wastewater decantation from a process or storage vessel, a separate lighter product phase can follow the intended discharge into the drain.
A correctly selected Belfield valve responds to the change in specific gravity and closes its main outlet when that lighter phase reaches the chamber. This can help retain the phase at source, before downstream effluent treatment.
Review the entire discharge route, including what happens when the valve closes and how retained product is recovered or handled.
The relevant immiscible phases must separate before reaching the valve. Confirm the expected water and product layers.
The calibrated float allows the heavier phase to pass and closes the main outlet as the lighter phase arrives.
Route the intended discharge into the reviewed treatment system. Include retained-product handling and independent monitoring.
The Belfield valve is a phase-responsive discharge device. It does not measure oil concentration, remove dissolved contaminants, replace a wastewater-treatment plant or establish that water meets a discharge limit.
For a site needing evidence of water quality as well as product retention, review the relevant measurement method and sampling point separately. PMA can help bring the valve duty and monitoring requirement together.
Explore portable and continuous hydrocarbon measurement for the relevant oil and water matrix.
Review the parameters, sampling arrangements and reporting information needed at the final discharge point.
Identify the phases that should and should not pass, the expected density and viscosity ranges, solids, emulsions and available head. Consider high or low flow, changing temperature, downstream pressure and the response to valve closure.
Identify both phases, their specific gravities and viscosities at operating temperature. Include solids, emulsions and wax where present.
Provide minimum, normal and maximum temperature and pressure, required flow, available head and downstream backpressure.
Include connection sizes, wetted-material and seal requirements, the discharge route, and a vessel or P&ID sketch.
PMA has supported process measurement and analysis since 1971. We bring the valve and its application together: the liquids, the vessel, the discharge route and the information your team needs.
Share your process conditions and a vessel or piping sketch. Our team can help you review selection, installation requirements and ongoing support.
Published operation, materials, model capacities and application limits.
Installation and operating guidance for the configured valve and process duty.
Explore the wider Belfield technical library and application background.
No. Compliance depends on the complete process, treatment, monitoring and applicable limits. The valve does not measure contaminant concentration or guarantee zero carry-over.
It can help retain a separate lighter phase when selected and operated for the actual application. Any recovery or savings claim needs evidence from that process.
No. The mechanism responds to separated phases through specific gravity. Dissolved contamination requires an appropriate treatment and measurement approach.
Speak to the PMA team about your instruments, reagents or service requirements. Tell us what you need, and we’ll help you find the right next step.
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