Purpose built valves for the prevention of an unintentional flow of water or other fluid from a potentially polluted or hazardous source into a potable water supply. Keystone can offer you a practical and affordable solution to all of these situations. We have developed a range of purpose built Reduced Pressure Zone devices, Double Check Valves and Vacuum Breakers you can rely on.

Reduced Pressure Zone Devices
For high and medium hazard rated applications.

• Pressure : up to 1600kPa
  
• Temperature : up to 90°C
  
• 15-50mm BSP screwed connections
  
• 65-300mm Flanged end connections
  
• Suitable for hot or cold service
  

Double Check Devices
For medium hazard rated applications.

• Pressure : up to 1600kPa
  
• Temperature : up to 90°C
  
• 15-50mm BSP screwed connections
  
• 65-300mm Flanged end connections
  
• Suitable for hot or cold service
  

Double & Single Check Detector Assembly with Bypass
For medium and low hazard rated applications.

• Testable Devices
  
• Pressure : up to 1600kPa
  
• Temperature : up to 90°C
  
• 15-50mm BSP screwed connections
  
• 65-300mm Flanged end connections
  
• Choice of single or double bypass in 65 - 300mm sizes
  

Accessories
Stainless Steel Enclosures, Test Kits