| Brand: | Bermad |
| Category: | Control Valves, 400 Series |
| Size Range: | 40-300mm |
| Connection: | 40-80mm - Female Threaded BSP 80-300mm - Flanged |
| Engineering Data: |
Product Description
The BERMAD Model 430-2 Way Pressure Relief/Sustaining Valve is a hydraulically operated, diaphragm-actuated control valve that can fulfill either of two separate functions. When installed in-line, it sustains minimum preset upstream (back) pressure regardless of fluctuating flow or varying downstream pressure. When installed as a relief or circulation valve, it relieves line pressure over preset.
Features and Benefits
- Line Pressure Driven Pressure Relief/Sustaining Valve
- Controls system fill-up
- Sustains upstream line pressure
- Relieves excessive pressure protecting pump and system
- Prioritizes pressure zones
- Advanced Globe Hydro-Efficient Design
- Unobstructed flow path
- Single moving part
- High flow capacity
- Fully Supported & Balanced Diaphragm
- Requires low opening and 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
Pressure Sustaining Valve
Pressure Sustaining Valve
1. BERMAD Model IR-430 protects the pump from overload and cavitation, prevents
main line emptying, and controls system fill-up
2. BERMAD Check Valve Model 70N
Circulation / Relief Valve
Circulation / Relief Valve
1. BERMAD Model IR-430 safeguards pump minimum flow and relieves excessive
line pressure.
2. BERMAD Active Check Valve Model 740Q
Typical Applications
- Downhill Supply Lines Emptying Prevention
- Pressure Zone Prioritizing
- Line Fill-Up Control
- Pump Overload and Cavitation Protection
- Pump Minimum Flow Safeguard
- Excessive Line Pressure Protection
Technical Data
Operation
The Needle Valve [1] continuously allows line pressure into the Control Chamber [2]. The Pressure Sustaining Pilot [3] senses Upstream Pressure [P1], and throttles when it drops below setting*. Pressure then accumulates in the control chamber causing the Valve to throttle closed maintaining [P1] at the pilot setting, and eventually closing drip-tight. The pilot releases accumulated pressure when [P1] rises above the setting, thereby causing the Valve to modulate open.
* Sustaining (In-Line) Valve Pilot should be set to the minimum system pressure allowed. The relief (Circulation) Valve Pilot should be set slightly above the system working pressure.
Materials
Body and Cover
- Polyester Coated Cast or (DN250 and larger) Ductile Iron
Spring
- Stainless Steel
Diaphragm
- Nylon fabric Reinforced NR with rugged insert
Bolts, Studs and Nuts
- Zinc-Cobalt plated Steel
Control Accessories
- Brass
Tubing and Fittings
- Reinforced Plastic and Brass
Pressure Ratings
- 16 bar
Operating Pressure Range
- 0.5-16 bar
For lower pressure requirements, consult Deeco.
Setting Range
- 1.5-16 bar
Setting ranges vary according to specific pilot springs. Please consult Deeco
Patterns and Sizes
- Globe: DN80-400
- Angle: DN80-100
End Connections
- 40-80mm - Female Threaded BSP
- 80-400mm - Flanged
Bermad - 430-2W - End Connections
Technical Specifications
For technical specifications (Flow charts, valve characteristics, dimensions, etc.) - Please refer to the Engineering Data:
For Spare Parts & Repair Kits - Please refer to the base model:
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.
