Bermad Model 430 - Pressure Relief/Sustaining Valve

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.

PRODUCT CODE:

430-XXX

SIZE RANGE:

40-400mm

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Features and Benefits

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Line Pressure Driven Pressure Relief/Sustaining Valve
- Controls system fill-up
- Sustains upstream line pressure
- Relieves excessive pressure protecting pump and system
- Prioritizes pressure zones
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Advanced Globe Hydro-Efficient Design
- Unobstructed flow path
- Single moving part
- High flow capacity
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Fully Supported & Balanced Diaphragm
- Requires low opening and actuation pressure
- Excellent low flow regulation performance
- Progressively restrains valve closing
- Prevents diaphragm distortion
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User Friendly Design
- Easy pressure setting
- Simple in-line inspection and service

Pressure Sustaining Valve
[1] BERMAD Model IR-430 protects pump from overload and cavitation, prevents main line emptying, and controls system fill-up.
[2] BERMAD Check Valve Model 70NCirculation / Relief Valve
[1] BERMAD Model IR-430 safeguards pump minimum flow and relieves excessive line pressure.
[2] BERMAD Active Check Valve Model 740Q

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Typical Applications

Downhill Supply Lines Emptying Prevention
Pressure Zone Prioritizing
Line Fill-Up Control
Pump Overload and Cavitation Protection
Pump Minimum Flow Safeguard
Excessive Line Pressure Protection

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Technical Specifications

Dimensions and Weights

Technical Data

Patterns and Sizes: Globe: 3-16”; DN80-400 Angle: 3-4”; DN80-100

End Connections:

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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.

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Materials:

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

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Flow Chart

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Operation

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.

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