Owner's 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

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MODEL 81-12 Check Valve • • • • • • 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.
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Pilot System Specifications 100-01 Pattern: Globe (G), Angle (A), End Connections: Threaded (T), Grooved (GR), Flanged (F) Indicate Available Sizes 81-12 Inches 1 1¼ 1½ 2 2½ 3 4 mm 25 32 40 50 65 80 100 G, A G, A G, A G, A G, A G, A G, A End Detail T T T, F, GR T, F, GR T, F, GR* T, F, GR T, F, GR Suggested Flow (gpm) Maximum 55 93 125 210 300 460 240 Suggested Flow (Liters/Sec) Maximum 3.5 6 8 13 19 29 15.