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Waterworks

Irrigation

Bermad Model 73Q - Quick Pressure Relief Valve

Hydraulically operated, diaphragm actuated quick pressure relief valve that relieves excessive system pressure when such pressure rises above a pre-set value.It responds immediately, accurately, and with high repeatability to a rise in system pressure by opening fully. It also provides a smooth drip tight closing.

PRODUCT CODE:
73Q-XXX
SIZE RANGE:
40-1200mm

BERMAD 700 series valves are hydraulically operated globe valves available in either standard oblique (Y) or angle (A) pattern design. They have a full bore hydrodynamic body providing an unobstructed flow path, with a seat assembly and double chamber unitized actuator that can be disassembled from the body as a separate integral unit.

Features and Benefits

  • Designed to - stand up to the toughest conditions
    - Excellent anti-cavitation properties
    - Wide flow range
    - High stability and accuracy
    - Drip tight sealing
  • Double chamber design
    - Moderated valve reaction
    - Protected diaphragm
    - Optional operation in very low pressure
    - Moderated closing curve
  • Flexible design - Easy addition of features
  • Obstacle free flow pass
  • V-Port Throttling Plug (Optional) - Very stable at low flow
  • Compatible with various standards
  • High quality materials
  • In-line serviceable - Easy maintenance

Major Additional Features

  • Flow stem – 73Q-M
  • Position indication – 73Q-S

Typical Installation

Bermad Model 73Q - Quick Pressure Relief Valve - Typical Application

Operation

Open

Bermad Model 73Q - Quick Pressure Relief Valve - Operation - OPEN

Closed

Bermad Model 73Q - Quick Pressure Relief Valve - Operation - CLOSED

This drawing refers to 1½ – 8”; 40-200 mm sized valves only. For other sizes please refer to the Model’s IOM.

Main Valve

Valve Patterns: “Y” (globe) & “A” (angle)

Size Range: 11/2–24”; 40-600 mm

Pressure Rating: 25 bar; 400 psi

End Connections: Flanged (all standard)

Threaded: BSP or NPT

Others: Available on request

Temperature Rating: 60°C; 180°F for cold water applications

Optional Higher temperature: Available on request

Standard Materials:

Body & actuator: Ductile Iron

Bolts, nuts & studs: Stainless Steel

Internals: Stainless Steel, Tin Bronze & Coated Steel

Diaphragm: Fabric-reinforced synthetic rubber

Seals: Synthetic rubber

Coating: Dark blue Fusion bonded epoxy

Control System

Standard Materials:

Accessories: Stainless Steel, Bronze & Brass

Tubing: Stainless Steel or Copper

Fittings: Stainless Steel or Brass

Pilot Standard Materials: Body: Stainless Steel, Bronze or Brass

Elastomers: Synthetic Rubber

Spring: Stainless Steel

Internals: Stainless Steel

Pilot Options: Please contact us for more information.

Notes

  • Main pipe diameter, pressure rating, flow rate and relief pressure are required for optimal sizing
  • Recommended continuous flow velocity: 0.3-15 m /sec; 1-50 ft /sec

Manual
Datasheet
Engineering Data

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Product code

Bermad Model 73Q - Quick Pressure Relief Valve

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