Check Valve - 81-12 | Cla-Val | Philippopoulos s.a.
Check Valve - 81-12 | Cla-Val | Philippopoulos s.a.

Check Valve - 81-12 | Cla-Val

Cla-Val 81-12 / 681-12 Check Valve

The Cla-Val 81-12 / 681-12 is a hydraulically operated, no-slam check valve designed for water distribution systems. The valve opens when inlet pressure exceeds downstream pressure and closes drip-tight upon pressure reversal, preventing backflow and water hammer.

Operation

Downstream pressure is routed to the cover chamber via control tubing. The valve opens gradually, minimizing opening surges. Hydraulic actuation ensures controlled closure, reducing slam during pump shutdown or operational transitions.

Technical Data

  • Models: 81-12 / 681-12
  • Type: Hydraulically operated no-slam check valve
  • Connection: Flanged
  • Standard: ANSI
  • Pressure Classes: 150 lbs, 300 lbs
  • Body Materials: Bronze, ASTM A216 WCB, ductile iron
  • Sealing: Drip-tight closure
  • Operation: Automatic, via hydraulic pilot/control tubing

Applications

Suitable for variable speed drive pumps, booster stations, municipal waterworks, irrigation networks, and industrial water lines where controlled backflow prevention and minimized slam are required.

Comparison with Standard Wafer Check Valves

The 81-12 performs the function of a wafer check valve but adds hydraulically controlled response. This is critical in VFD pump systems, where flow and pressure changes are gradual and require stable, non-slam backflow prevention.

FAQ

When is the 81-12 selected?
In pump stations requiring check valves with controlled opening and closing to limit surge and slam.

Is external power required?
No. Operation is based on system line pressures.

Available body materials?
Bronze, ASTM A216 WCB, or ductile iron.

Standard (Options)
  • ANSI
Connection (Options)
  • Flanged
Material (Options)
  • Bronze
  • ASTM A216 WCB
  • Ductile Iron
Pressure Rating (Options)
  • 150 lbs
  • 300 lbs

Datasheet and documents

Description

The Cla-Val Model 81-12/681-12 Check Valve is a hydraulically operated No-Slam Check Valve. This valve opens when the pressure at the inlet exceeds the discharge pressure. A gradual rate of opening prevents sudden opening surges. When a pressure reversal occurs the higher downstream pressure is applied to the cover chamber through the control tube lines, and the valve closes drip tight.

The Cla-Val Model 81-12 does the work of a standard wafer check valve and provides many additional benefits that make it an ideal choice for variable speed drive pump applications where a check valve is needed to prevent return flow.