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Bermad - Model 430 - 2 Way Pressure Relief / Sustaining Valve

Deeco - Bermad - 430-2W - Product Image.
Brand: Bermad
Category: Control Valves, 400 Series
Size Range:



40-80mm - Female Threaded BSP

80-300mm - Flanged

Engineering Data:

Bermad - Model 400 - Engineering Data

Product Description

The BERMAD Model 430-2 Way Pressure Relief/Sustaining Valve is a hydraulically operated, diaphragm-actuated control valve that can fulfill 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 over preset.

Features and Benefits

  • 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
  • Advanced Globe Hydro-Efficient Design
    • Unobstructed flow path
    • Single moving part
    • High flow capacity
  • Fully Supported & Balanced Diaphragm
    • Requires low opening and actuation pressure
    • Excellent low-flow regulation performance
    • Progressively restrains valve closing
    • Prevents diaphragm distortion
  • User-Friendly Design
    • Easy pressure setting
    • Simple in-line inspection and service

Pressure Sustaining Valve

Bermad - 430-2W - Features and Benefits 1

Pressure Sustaining Valve

1. BERMAD Model IR-430 protects the pump from overload and cavitation, prevents
main line emptying, and controls system fill-up

2. BERMAD Check Valve Model 70N

Circulation / Relief Valve

Bermad - 430-2W - Features and Benefits 2

Circulation / Relief Valve

1. BERMAD Model IR-430 safeguards pump minimum flow and relieves excessive
line pressure.
2. BERMAD Active Check Valve Model 740Q

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

Technical Data


Bermad - 430-2W - 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 the pilot setting, and eventually closing drip-tight. The pilot releases accumulated pressure when [P1] rises above the setting, thereby causing the Valve to modulate open.

* Sustaining (In-Line) Valve Pilot should be set to the minimum system pressure allowed. The relief (Circulation) Valve Pilot should be set slightly above the system working pressure.


Body and Cover

  • Polyester Coated Cast or (DN250 and larger) Ductile Iron


  • Stainless Steel


  • 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

Pressure Ratings

  • 16 bar

Operating Pressure Range

  • 0.5-16 bar

For lower pressure requirements, consult Deeco.

Setting Range

  • 1.5-16 bar

Setting ranges vary according to specific pilot springs. Please consult Deeco

Patterns and Sizes

  • Globe: DN80-400
  • Angle: DN80-100

End Connections

  • 40-80mm - Female Threaded BSP
  • 80-400mm - Flanged
Bermad - 430-2W - End Connections

Bermad - 430-2W - End Connections

Technical Specifications

For technical specifications (Flow charts, valve characteristics, dimensions, etc.) - Please refer to the Engineering Data:

Bermad - Model 400 - Engineering Data

Due to the wide range of options available and criteria for correct model selection, pricing and configuration are available on application only.

Please consult with Deeco engineers for more information.

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