Bring liquid properties, flow and installation conditions together to select the model and float setting.
The valve body and float setting must suit the actual phases and installation. Required flow, available head and downstream conditions affect capacity; the specific-gravity difference determines the phase-response duty.
The published figures provide a starting point for selection. They are not a guarantee of flow across all liquids, temperatures and pipework arrangements.
Send PMA the process data and a vessel or P&ID sketch so the model, wetted materials and configuration can be reviewed together.
The brochure lists two carbon steel models and three stainless steel models. Confirm current availability and the configuration for your application.
| Model | Capacity imp gal/h |
Inlet in |
Main outlet in |
Side run-off in |
|---|---|---|---|---|
| MS/LC | 1,500 | 2 | 1½ | 1½ |
| MS/STD | 10,000 | 4 | 2 | 2 |
| SS6 | 1,500 | 2 | 1 | 1 |
| SS8 | 3,000 | 3 | 2 | 2 |
| SS10 | 10,000 | 4 | 2 | 2 |
These are published reference capacities, not guaranteed flows for every installation. Confirm the actual liquid properties, head, temperature, pressure and discharge conditions before choosing a model.
The published design pressure is 75 psig; hydrostatic test pressure is 112.5 psig. The capacity table uses a 25 ft (7.5 m) reference head. Test pressure is not an operating rating.
For the brochure’s atmospheric-discharge duty at up to 50 ft (15 m) head, water up to 80°C uses nominal capacity. From 80–95°C, the brochure specifies a 25% reduction. Other conditions need review.
Up to 50 cSt at operating temperature has little or no effect on published capacity. From 50–100 cSt, the brochure specifies a 25% reduction; consult PMA above 100 cSt.
Review both specific gravities at operating temperature, especially the smallest difference expected. The average 5% figure does not establish suitability for every liquid pair.
State any suspended solids, wax, persistent emulsion or flashing tendency. Low-flow duties with solids need particular review, including inspection and cleaning arrangements.
Do not reduce the inlet below the stated model size. Confirm outlet restrictions, downstream pressure, material and seal compatibility before specifying the pipework.
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. The brochure identifies 75 psig as the design pressure and 112.5 psig as the hydrostatic test pressure. Final operating conditions must match the reviewed configuration.
It is a nominal reference figure at 25 ft (7.5 m) head. Actual liquids, viscosity, temperature, available head, downstream conditions and pipework must be considered.
No. The brochure qualifies its temperature guidance for atmospheric discharge at up to 50 ft (15 m) head and specifies a capacity reduction from 80–95°C. Higher head, other pressures or temperatures require review.
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