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Fire Protection

Bermad Model FP420 00 - Pressure Reducing Valve

The Model FP 420-00 Pressure Reducing Valve is a hydraulically self operated, diaphragm actuated control valve that reduces high, unstable upstream pressure to maintain precise stable downstream pressure, regardless of flactuating demand or varying upstream pressure.


Features and Benefits

  • Advanced Elastomeric Globe type – Low pressure loss
  • One-piece molded elastomeric moving part – No maintenance required
  • Simple design – Cost effective
  • Factory pre-assembled trim – Out-of-Box Quality
  • In-line serviceable – Minimal down time

Typical Applications

  • Hose station feeds
  • Sprinkler systems with over pressure
  • Deluge systems with over pressure
  • Foam systems
  • Fire hydrant water supply


The BERMAD Model FP 420-00, pilot operated pressure reducing valve automatically and accurately reduces upstream water pressure to a specific, adjustable value. The FP 420-00 operates under both flowing and non-flowing (static) conditions. The Pressure Reducing Pilot [1] senses downstream pressure [2] and in real time modulates the main valve [3] to maintain the constant downstream pressure.

In no-flow static conditions, should the downstream pressure start rising above pilot setting, the pilot closes, shutting the main valve drip-tight [4] to maintain the allowable downstream pressure.

Engineer Specifications

The pressure reducing valve shall eliminate downstream over-pressure, maintaining a constant downstream delivery pressure, regardless of varying pressures and/or flows. The main valve shall be an elastomeric type globe valve with a rolling-diaphragm. Valve actuation shall be accomplished by a fully peripherally supported, one-piece balanced rolling-diaphragm, vulcanized with a rugged radial seal disk. The diaphragm assembly shall be the only moving part.

The valve shall have an unobstructed flow path, with no stem guide or supporting ribs. The valve shall have a removable cover for quick in-line service enabling all necessary inspection and servicing.

The control trim shall be supplied as an assembly, pre-assembled and hydraulically tested at an ISO 9000 and 9001 certified factory.

Typical Installations

System Components

1 - BERMAD Model FP 420-00

2 - BERMAD Model FP-430-UF Pressure Relief Valve

3 - Isolating Valve

4 - Pressure Gauge

5 - Strainer

6 - BERMAD Model FP 720-UL, High Pressure Reducing Valve

Installation Considerations

  • Allow enough room around the valve assembly for any future maintenance.
  • Install isolating valves upstream and downstream of the system.
  • Install the valve horizontally with the cover facing up (consult Bermad for other configurations).
  • Install a relief valve (recommended: BERMAD Model FP 430-UF) of the appropriate size on the downstream side of the FP 420-00, as required by NFPA-20 standard.
  • Install a pressure gauge on each side of the system.

Technical Data

Connection Standard

  • Flanged: ANSI B16.42 (Ductile Iron),
  • B16.5 (Steel & Stainless Steel),
  • B16.24 (Bronze)
  • ISO PN16
  • Threaded: NPT or ISO-7-Rp for 2, 2½ & 3”
  • Grooved: ANSI/AWWA C606 for 2, 3, 4, 6 & 8”

Water Temperature

  • 0.5 – 50°C (33 – 122°F)

Available Sizes

  • Globe: 2, 2½, 3, 4, 6, 8, 10 & 12”

Pressure Rating*

  • Max. inlet: 250 psi (17 bar)
  • Set: 30 - 165 psi (2 - 11.5 bar)
  • Test : 365 psi (25 bar)


  • ABS
  • Lloyd’s Registered

Manufacturers Standard Materials

Main valve body and cover

  • Ductile Iron ASTM A-536

Main valve internals

  • Stainless Steel 304 & Cast Iron

Control Trim System

  • Brass control components/accessories
  • Stainless Steel 316 tubing & fittings


  • Nylon fabric reinforced polyisoprene NR


  • Electrostatic Powder Coating Poleyester, Red (RAL 3002)

Optional Materials

Main valve body

  • Carbon Steel ASTM A-216 WCB
  • Stainless Steel 316
  • Ni-Al-Bronze ASTM B-148

Control Trim

  • Stainless Steel 316
  • Monel® and Ni-Al-Bronze
  • Hastalloy C-276


  • NBR
  • EPDM


  • High Build Epoxy Fusion-Bonded with UV Protection, Anti-Corrosion

PDF Datasheets

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Engineering Data*

2D CAD Drawing

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Engineering Data*
* Note: For some products Manual or Engineering Data are available only upon request.

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Product code

Bermad Model FP420 00 - Pressure Reducing Valve

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