Flow Control Valves

Introduction

Catalog

  • Prioritizing main system over sub-system
  • Limiting consumers over demand
  • Controlling pipeline fill rate
  • Pump overload & cavitation protection

The Model 770-U Flow Control Valve is a hydraulically operated, diaphragm actuated control valve that maintains pre-set maximum flow, regardless of fluctuating demand or varying system pressure.

    Features and Benefits

  • Line pressure driven – Independent operation
  • Hydraulic flow sensor (upstream installation)
  • In-line serviceable – Easy maintenance
  • Double chamber design
  • Flexible design – Easy addition of features
  • Variety of accessories – Perfect mission matching
  • "Y" or angle, wide body – Minimized pressure loss
  • Semi-straight flow – Non-turbulent flow
  • Stainless Steel raised seat – Cavitation damage resistant
  • Obstacle free, full bore – Uncompromising reliability
  • V-Port Throttling Plug – Low flow stability

Pump Control Valves

Introduction

Catalog

  • Isolates system from the effects of pump starts and stops for:
    • Solitary single speed pumps
    • Battery of single speed pumps (add & switch)
    • Battery of variable speed pumps (add)

The Model 740 Booster Pump Control Valve is a hydraulically operated, diaphragm actuated active check valve that opens fully or shuts off in response to electric signals. It isolates the pump from the system during pump starting and stopping, to prevent pipeline surges

    Features and Benefits

  • Line pressure driven
    • Independent operation
    • No motor required
    • Long term drip tight sealing
  • Solenoid controlled
    • Independent operation
    • No motor required
    • Long term drip tight sealing
  • Check feature (spring loaded type)
    • Replaces line sized check valve
    • Fail-safe mechanical closure
  • In-line serviceable – Easy maintenance
  • Double chamber
    • Full powered opening (option “B”) and closing
    • Non-slam opening and closing characteristic
    • Protected diaphragm
  • Balanced seal disk – High flow capacity
  • Flexible design – Easy addition of hydraulic features

Pressure Relief/Sustaining Valve

Introduction

Catalog

Safeguarding Pump Minimum Flow

The Model 730 relieves over pressure caused by excessive pump discharge during low demand. To keep a constant discharge pressure, the difference between pumped flow and consumer demand can be circulated back to pump suction.

Circulation valves are often exposed to severe cavitation because valve ∆P and velocity are usually high while downstream pressure is very low. On the other hand, the valves operate under these conditions for relatively short periods. Increased valve durability for applications requiring long operating periods will be achieved by using cavitation resistant materials, adding a downstream orifice, installing an upstream pressure reducing valve, increasing valve size, or any combination of these choices.

PFCMD

Introduction

Catalog

The Pressure Flow Control Metering Device (PFCMD) from Bermad, integrates a vertical turbine Woltman-Type water meter with a diaphragm actuated hydraulic control valve equipped with one, two or more pilots. The PFCMD automatically performs one, two or more independent functions, such as sustaining a preset minimal upstream pressure, maintaining the level in elevated reservoirs or sustaining maximum set flow. All functions are performed irrespective of change in upstream pressure and / or demand. Functions can easily be added or removed in a modular way. The meter accuracy is independent and not affected by the action of the valve. An adjusting screw on each pilot allows setting of the desired set-point for Pressure, Level & Flow. The valve is compatible with SCADA.

Application of PFCMD

Typical Applications:

  • Computerized Irrigation Systems
  • Distribution Centers
  • Remote Flow Data Read-Out
  • Flow Monitoring & Leakage Control
  • Water Treatment Systems
  • Volumetric Irrigation Systems

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