• PIPELINE & PUMP COLUMN SYSTEM
  • PUMP CONTROL VALVES
  • COLUMN DRAIN VALVES
  • SURGE RELIEF VALVES
  • SNIFTER / AIR ADMISSION VALVES
  • NON RETURN VALVES
• MANUAL ISOLATION VALVES
• PUMP CONTROL VALVES
• NON RETURN VALVES
• SURGE RELIEF VALVES
• FLOW CONTROL VALVES
  • SAFETY ISOLATION VALVE - Low Pressure
  • SAFETY ISOLATION VALVE - High Pressure
• COOLING CAR VALVES
• DAM LEVEL CONTROL VALVES
• TURBINE CONTROL VALVES
• PRESSURE REDUCING VALVES
  • REGULATING VALVES
  • EXTERNAL RATIO VALVES
  • MULTI STAGE RATIO VALVES
• TECHNICAL SPECIFICATIONS

HPE’s External Ratio Valves reduce a high inlet pressure into the valve to a low downstream pressure according to a fixed ratio with optional ratio trim to compensate for line pressure losses. Pressure ratios from 1,2:1 up to 3:1 can be achieved. The design of the valve was done with specific emphasis on minimizing noise, cavitation and flow surging.

• Stable control over the full range of operation from 0 to 100% flow capacity
• Pressure ratios can be altered by changing the size of the external control piston
• Ratio will remain within 7% at all flow rates
• Operates at differential pressures of up to 15 MPa
• Finite pressure adjustment control is optional

• Conform to ANSI B16.34
• Y-pattern globe-type body for reduced pressure drop
  
• Can be maintained in line
  
• Flanges to customer requirements
  
• Cast steel body with corrosion resistant internal parts (galvanised body optional)
  
• Rated 25 MPa working pressure
  
• High dirt tolerance
  
• High cavitation resistance due to poppet and cage design