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Bermad - Model 423 - Pressure Reducing and Sustaining Valve

Bermad - 423 - Prodcut Image
Brand: Bermad
Category: Control Valves, 400 Series

25-80mm - Female Threaded BSP

80-300mm - Flanged

Size Range:


Engineering Data:

Bermad - Model 400 - Engineering Data

Product Description

The BERMAD Model 423 Pressure Reducing and Sustaining Valve is a hydraulically operated, diaphragm-actuated control valve with two independent functions. It sustains minimum preset upstream pressure regardless of fluctuating flow or varying downstream pressure, and it prevents downstream pressure from rising above maximum preset regardless of fluctuating flow or excessive upstream pressure.

Features & Benefits

  • Line pressure Drive, Hydraulically controlled
    • Prioritized higher pressure zones
    • Protects lower pressure zones
    • Controls system fill-up
    • Prevents pipeline emptying
    • Protects pump from overload and cavitation
    • Compensates during groundwater drawdown
    • Protects downstream system
  • Advanced Globe Hydro-Efficient Design
    • Unobstructed flow path
    • Single moving part
    • High flow capacity
  • Fully Supported & Balanced Diaphragm
    • Requires low 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
    • Easy addition of control features

Bermad - 423 - Features and Benefits

[1] BERMAD Model IR-423-XZ sustains filters downstream

pressure ensuring sufficient backwash pressure, preventing line

emptying, controls downstream system fill up & reduces its

operation pressure

[2] BERMAD Filters Back Wash valves Model IR-350

[3] BERMAD Air valve Model IR-K-10-P

[4] BERMAD Field valve IR-110-X

Typical Applications

  • Line Fill-Up Control Solutions
  • Filter Backwash Pressure Sustaining
  • Pump Circulation Systems (with Orifice)
  • Pressure Reducing Systems
  • Line Emptying Prevention

Technical Data



The Pressure Reducing Pilot (PRP) 1 is hydraulically connected to the Valve Control Chamber 2 through the Pressure Sustaining Pilot (PSP) 3 . The PSP commands the Valve to throttle closed should Upstream Pressure P1 drop below setting. When P1 rises above setting, the PSP switches and allows the PRP to control the Valve, commanding it to reduce Downstream Pressure P2. Should line pressure remain above PSP setting but below the PRP setting - the valve opens fully. The Manual Selector 4 enables local manual closing.


Body and Cover:

  • Cast iron (up to 200mm)
  • Ductile Iron (250mm and above)


  • NR, Nylon fabric reinforced


  • Stainless steel

Cover Bolts:

  • Stainless steel

Pressure Rating:

  • 16 bar

Operating Pressure Range:

  • 0.5-16 bar

Setting Range:

  • 1.5-16 bar

The setting Range varies according to specific pilot springs. Please consult Deeco.

Control Accessories :

Tubing and Fitting

  • Reinforced plastic

Pilot Spring Range

Pilots Spring Range

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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