Cla-Val 81-12 - Manual

• Simple Proven Design
• No-Slam Operation
• Drip-Tight Shut-Off
• Recommended for Variable Speed Pumps
• No Packing Glands or Stuffing Boxes
• Easy to Install & Maintain
The Cla-Val Model 81-12 Check Valve is a hydraulically operated
No-Slam Check Valve. This valve opens when the pressure at the
inlet exceeds the discharge psudden 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.
This valve is ideally suited for use where a positive shutoff is required.
The rubber disc assures tight sealing even if the fluid contains grit or
other small-size particles. The simple packless design insures
reliable operation and freedom from leaks.
Schematic Diagram
Item Description
1 Hytrol (Main Valve)
Typical Applications
Check Valve
For valve sizes larger than 4", use Model 81-02.
MODEL
Install on the discharge of booster pumps to prevent
return flow when pump is off. Relief valve as shown is
good practice to minimize surges when pump stops.
81-12