Floating Roof Drain Protection for Articulated Systems
The Belfield Valve protects articulated roof drain and flexible-hose assemblies by releasing rainwater and closing automatically if stored product reaches the tank-side outlet.
A Self-Actuated Valve for Floating Roof Drains
Installed at the tank-side outlet of an articulated-pipe or flexible-hose roof drain system, the Belfield Valve remains open for rainwater and closes when the specific gravity changes to the stored product. The mechanical response requires no external power.
- Automatically drains accumulated rainwater
- Closes as product replaces water at the valve
- Optional magnetic proximity float sensing for hazardous areas
- Robust construction for exposed tank-farm service
Two risks every floating roof tank must control
External floating roof tanks commonly use an articulated pipe or flexible-hose drain assembly to carry rainwater from the roof to a tank-side outlet. The Belfield Valve protects that outlet; it does not replace the internal drain assembly. The complete drainage system must manage two potential problems:
01.
Roof loading from retained rainwater
If rainwater is not drained, its increasing weight can overload the floating roof and may ultimately cause it to sink.
02.
Product discharge following drain failure
If an internal articulated drain joint or hose fails, stored product can enter the drainage route and escape to ground or the site drains.
How the Belfield Valve protects the drainage system
A Belfield Valve can be installed on the tank-side drain connection. The optional swan-neck outlet keeps the valve flooded while preventing unwanted siphoning, allowing the float to remain ready whether or not rainwater is flowing.
During rainfall, water passes from the roof through the internal drain and the Belfield Valve. If a drain joint or hose leaks, the arriving product changes the liquid specific gravity and the valve closes automatically. This helps prevent valuable product reaching the drain, contaminating the ground or creating an expensive recovery operation.
Tank-farm advantages
Automatic
No routine operator intervention for normal rainwater drainage.
Fail-conscious
Specific-gravity response protects against product discharge.
Hazardous-area option
Magnetic proximity indication can be specified.
Tank-Bottom or Roof Drainage?
Choose the route that matches the drainage duty, then provide the full operating data for review.
Tank Dewatering
Drain settled water from storage tanks and retain the lighter product with an automatically closing, specific-gravity-operated Belfield Valve.
Size Your Valve
Start with your liquids, flow and available head. Use published model data to prepare an enquiry, not an automatic selection.
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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