Bermad - Model 730 - Pressure Relief / Sustaining Valve

Pressure relief/sustaining hydraulically operated control valve that can fulfill either of two separate functions: When installed in-line, it sustains minimum pre-set, upstream (back) pressure regardless of fluctuating flow or varying downstream pressure. When installed as a “branched from the line” circulation valve it relieves excessive line pressure when above maximum pre-set.

BERMAD 700 SIGMA EN/ES series valves are hydraulic, oblique pattern, globe valves with a raised seat assembly and double chamber unitized actuator, that can be disassembled from the body as a separate integral unit. The valve hydrodynamic body is designed for an unobstructed flow path and provides excellent and highly effective modulation capacity for high differential pressure applications. The valves are available in the standard configuration or with an Independent Check Feature code "2S". The 700 Sigma EN/ES Valves operate under difficult operation conditions with minimal cavitation and noise. They meet the size and dimensions requirements of various standards.

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

• Pressure sustaining and reducing valve – 723
• Differential pressure sustaining – 736
• Quick pressure relief valve – 73Q
• 3-Way control – 730-X
• Solenoid control – 730-55
• Hydraulic check feature – 730-20
• Anti-cavitation cage – 730-C2
• High sensitivity pilot – 730-12
• Electrically selected multi-level setting – 730-45
• Level control and pressure sustaining valve – 753
• Pump control and pressure sustaining valve – 743

Typical Installation

Operation

Main Valve

Valve Patterns: “Y” (Globe)

Size Range: 50-600mm

Pressure Rating: 16 bar - with higher pressure options available.

End Connections:

EN: 50-400mm - Flanged

ES: 65-600mm - Flanged

Plug Types: Flat disc, V-port, Cavitation cage

Temperature Rating: 60°C, for Coldwater 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:

Various pilots and calibration springs are available.

Select according to valve size and operating conditions. For more details check pressure reducing pilots and pressure-sustaining pilots product pages.

Notes:

• Inlet pressure, outlet pressure, and flow rate are required for optimal sizing and cavitation analysis
• Recommended continuous flow velocity: 0.1-6.0m/sec.
• Minimum operating pressure: 0.7 bar. For lower pressure requirements consult Deeco.

For technical specifications (Flow charts, valve characteristics, dimensions, etc.) - Please refer to the Engineering Data:
Bermad - Model 700 - Sigma EN/ES - Engineering Data