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Differential Pressure Sustaining Valve WW-436-BE

Hydraulically operated, differential pressure-sustaining control valve that sustains minimum pre-set differential pressure between two local or remote points, regardless of fluctuating flow or varying upstream pressure. BERMAD 400 series valves are hydraulically operated, simple and reliable, globe valves with full bore hydrodynamic body providing an unobstructed flow path and superior performance. The valves balanced rolling-diaphragm assembly is vulcanized with a rugged radial seal disk construction, performing as the valves only moving part.

Product Features & Benefits
  • High quality construction materials ensure reliable, long lasting operation
  • Full bore valve port area and hydrodynamic body ensure unobstructed flow path; minimal pressure loss with low cavitation damage
  • Fully supported and balanced rolling diaphragm – low actuation pressure and excellent low flow regulation performance
  • Ensured operation after long standby periods
  • Straightforward three major components design – easy and simple on-site inline maintenance with minimal down time
  • Upstream and downstream sensing – very accurate modulation according to local readings
  • Advanced control loop design – linear, accurate and stable modulation
  • Open/close/automatic override – enabling selection between various control regimes
  • Easy on-site set point change – enables calibration of the control loop to various seasonal and other operation regimes
  • Optional external isolation preparation for hot/cold water applications – prevents condensation and energy loses
Typical Product Applications

Typical Application

  • Sustaining pre-set differential pressure between distribution and circulation in close circuit energy systems such as air conditioning and cold/hot water supply networks; preventing excessive pressure and reacting to varying consumer demand
  • Sustaining pre-set differential pressure between open circuit hot/cold water supply networks in buildings; balancing and preventing pressure fluctuations between the hot and cold water supplied to consumers
  • Sustaining pump differential pressure in circulation or where the supply line pressure regimes vary; preventing pump overload and cavitation damage