The BERMAD Model IR-430 Pressure Relief/Sustaining Valve is a hydraulically operated, diaphragm actuated control valve that can fulfil either of two separate functions. When installed in-line, it sustains minimum preset upstream (back) pressure regardless of fluctuating flow or varying downstream pressure. When installed as a relief or circulation valve, it relieves line pressure in excess of preset.
Patterns and Sizes: Globe: 3-16”; DN80-400 Angle: 3-4”; DN80-100
End Connections:
Pressure Ratings: 16 bar; 232 psi
Operating Pressure Range: 0.5-16 bar; 7-232 psi
For lower pressure requirements, consult with us
Setting Range: 1.5-16 bar; 22-232 psi
Setting ranges vary according to specific pilot spring. Please consult with us.
Body and Cover: Polyester Coated Cast or (10”; DN250 and larger) Ductile Iron
Spring: Stainless Steel
Diaphragm: Nylon fabric Reinforced NR with rugged insert Bolts, Studs and Nuts: Zinc-Cobalt plated Steel
Control Accessories: Brass
Tubing and Fittings: Reinforced Plastic and Brass
The Needle Valve [1] continuously allows line pressure into the Control Chamber [2]. The Pressure Sustaining Pilot [3] senses Upstream Pressure [P1], and throttles when it drops below setting*. Pressure then accumulates in the control chamber causing the Valve to throttle closed maintaining [P1] at pilot setting, and eventually closing drip-tight. The pilot releases accumulated pressure when [P1] rises above setting, thereby causing the Valve to modulate open.
* Sustaining (In-Line) Valve Pilot should be set to minimum system pressure allowed.
Relief (Circulation) Valve Pilot should be set slightly above system working pressure.
Please specify the requested valve in the following sequence: (for more options, please contact us.)
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