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Fire Protection

Bermad Model FP42T - Pressure Reducing Valve

The BERMAD model 42T is an elastomeric, line pressure driven pilot operated pressure control valve. Designed specifically for advanced fire protection systems and the latest industry standards. The 42T reduces high upstream pressure to a precise, preset, stable downstream pressure. Due to its exceptional reliability and low head loss the 42T is ideal for control of fire pump discharge. It is also well-suited to prevent over-pressure in sprinklers, hose stations, and other discharge devices. As an option the 42T can be fitted with a valve position indicator that can include a limit switch suitable for Fire & Gas monitoring systems.


Features and Benefits

  • Safety and reliability
    - Time-proven, simple, fail-safe actuation
    - Single piece, rugged, elastomeric diaphragm seal - VRSD technology
    - Obstacle-free, uninterrupted flow path
    - Suitable for pump discharge control, due to low headloss
    - No mechanical moving parts
  • High performance
    - Fast, smooth stabilizing response to pressure fluctuations
    - Very high flow efficiency
    - Straight through Y - type body
    - Approved for PN25/365 psi
  • Specifically-designed for fire protection
    - Face-to-face length standardized to ISO 5752 EN 558-1
    - Accurate and stabilizing pressure control
    - Meets the requirements of industry standards
  • Quick and easy maintenance
    - In-line serviceable
    - Fast and easy cover removal

Typical Applications

  • Sprinkler feed systems
  • Fire pump discharge control
  • Hose station supply
  • Fire hydrant supply
  • Foam systems
  • Zonal pressure control

Additional Features

  • Sea water compatibility
  • Large control filter
  • Integrated downstream relief valve
  • Position limit switches


The BERMAD Model 42T pressure control valve, reduces water pressure automatically and accurately from a high inlet pressure to a lower, preset outlet pressure. The outlet set pressure can be adjusted by way of the pilot adjusting screw [5]. The valve operates under both flow and static conditions. The pressure-reducing pilot valve [4] senses changes in outlet pressure [6] and modulates the control valve to maintain the preset outlet pressure. When outlet pressure rises above the preset pressure , the pilot valve throttles, enabling pressure to accumulate in the control chamber [1], this causes the control valve to close further and reduce outlet pressure. When outlet pressure falls, the pilot valve opens wider, releasing pressure from the control chamber. This causes the control valve to open wider and increase outlet pressure. An integral restrictor [3] controls the valve’s closing speed. For valve sizes 12, 14 & 16” an adjustable needle valve is provided.

System P&ID


1 BERMAD 400Y Water Control Valve

2 Y Strainer

3 Restriction Orifice

4 Pressure Reducing Pilot Valve

Optional System Items

ZS Limit Switch Assembly

SRV BERMAD 43T Pressure Relief Valve

I Visual Indicator

See also Factory Fitted Options under the Valve

Code Designations on the last page

System Installation

A typical installation of the BERMAD model 42T features a pilot valve for the automatic stable and accurate reduction of water pressure from a high upstream value to a preset lower downstream value, regardless of fluctuating upstream pressure or flow. A unique actuator design ensures quick and smooth valve action. Installed singly, the 42T provides a standard pressure-reducing system. Installed in parallel, two 42T valves provide high flow rates, redundancy, and zero downtime for maintenance. Installed in series, two 42T valves can provide a two-stage, high reduction in pressure and/or added protection to a reduced-pressure zone.

To comply with the requirements outlined in the FM, UL and NFPA standards, a pressure relief valve of at least ½” is to be installed on the downstream side of any pressure reducing valve. For sizing the required relief valve for optimal performance see the BERMAD recommendation in the table below.

Sprinkler System Pressure Reduction

  • Reduces a high, unstable pressure supply to a preset, stable system pressure
  • Sets the sprinkler pressure to suit the system design
  • For zonal pressure control

Hose System Pressure Reduction

  • Reduces a high/unstable pressure supply to suit fire hose pressure
  • Limits fire hose pressure to 7 bar (100 psi) to meet NFPA 14 regulations for maximum allowable hose pressure supply

Two-Stage Pressure Reduction

  • Backup pressure reducing valve in-line to a master valve to secure pressure zone rating at all times. When in doubt consult BERMAD

Engineer Specifications

The pressure reducing valve shall maintain a constant, preset, downstream pressure regardless of fluctuating upstream pressure or flow.

The valve shall be UL listed and FM approved, 25 bar / 365 psi rated, line pressure driven and pilot operated. It shall be of the elastomeric-type with a straight-through Y-type body.

The valve shall have an unobstructed flow path with no stem guide or supporting ribs.

Valve actuation shall be accomplished by a single-piece, rolling diaphragm bonded with a rugged radial seal disc.

The diaphragm assembly shall be the only moving part.

Maintenance, inspection or service shall be carried out in-line and without removal of the control trim. The valve and it’s entire control trim shall be supplied pre-assembled and hydraulically tested by a factory certified to ISO 9000 and 9001 standards.

Technical Data

Available Sizes (inch)

  • Flanged - 1½, 2, 2½, 3, 4, 6, 8, 10, 12, 14 & 16”
  • Grooved - 1½, 2, 2½, 3, 4, 6, 8”
  • Threaded - 1½ & 2”

Pressure Rating

  • ANSI#150 - 17.2 bar / 250 psi
  • ANSI#300 - 1½, 2 & 2½” 28 bar / 400 psi (*); 3” to 10” 25 bar / 365 psi 12” to 16” 20 bar / 300 psi
  • Grooved: 1½, 2 & 2½” - 28 bar / 400 psi (*), 3” to 8” 25 bar / 365 psi
  • Threaded: 1½ & 2” - 28 bar / 400 psi (*)
  • Setting range:

For FM Approval: 2 - 12 bar (30 - 175 psi). For UL listing: 4 - 12 bar (60 - 175 psi)

Also Available: 2 - 16 bar (30 - 235 psi) or 8.6 - 25 bar (125 - 365 psi) * the 1½, 2 & 2½” valves are UL-Listed for 28 bar/400 psi, and FM Approved for 25 bar/365 psi


  • HTNR - Fabric Reinforced High Temperature Compound - See engineering data

How to Order

Please specify the requested valve in the following sequence: (for more options, please contact us.)

PDF Datasheets

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Engineering Data*

2D CAD Drawing

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Engineering Data*
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Product code

Bermad Model FP42T - Pressure Reducing Valve

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