Check Valve - 81-02 & 681-02 | Cla-Val

Cla-Val 81-02 / 681-02 Check Valve

The Cla-Val 81-02 / 681-02 is a hydraulically operated, no-slam check valve with dual speed controls, designed for water distribution systems. The valve opens when inlet pressure exceeds downstream pressure and closes drip-tight upon pressure reversal, preventing backflow.

Operation

Downstream pressure is routed to the cover chamber via control tubing. Two adjustable speed controls allow independent regulation of opening and closing rates, minimizing hydraulic surges and water hammer during transient conditions.

Technical Data

• Models: 81-02 / 681-02
• Type: Hydraulically operated no-slam check valve
• Control: Dual speed controls (opening/closing)
• Connection: ANSI flanged
• Pressure classes: 150 lbs, 300 lbs
• Body materials: Bronze, ASTM A216 WCB, ductile iron
• Sealing: Resilient disc for drip-tight shutoff

Applications

Suitable for potable water pump stations, booster pump discharge lines, industrial water networks, and installations requiring positive isolation against reverse flow. Compatible with clean and slightly contaminated water containing small particulates.

Difference from 81-01 / 681-01

The 81-02 / 681-02 features dual speed controls, enabling precise adjustment of both opening and closing speeds for improved surge mitigation in systems with variable flow or transient events.

FAQ

When is this valve selected?
Applied where check function with adjustable no-slam closure is required, especially in systems sensitive to pressure transients.

Does it tolerate small particulates?
The resilient disc design maintains tight shutoff even in the presence of grit or minor solids in the water.

Is it automatic?
Yes, the valve operates hydraulically and requires no external power source.