Cla-Val 81-07/681-07 - Manual

Non-Slam Dual Speed Control Check Valve
• Simple Proven Design
• No-Slam Operation
• Drip-Tight Shut-Off
• Dual Speed Control
• No Packing Glands or Stuffing Boxes
• Available in a Variety of Materials
The Cla-Val Model 81-07/681-07 Non-Slam Dual Speed Control Check
Valve is a hydraulically operated No-Slam Check Valve with dual speed
controls. This valve opens when the pressure at the inlet exceeds the dis-
charge 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.
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.
Note: The effectiveness of this valve is related to pipeline velocity. We rec-
ommend a maximum flow based on pipeline velocity of 6 feet per second.
If pipeline velocities exceed 6 feet per second, consideration should be
given to adding a Cla-Val Model 50-01 Pressure Relief Valve or a Cla-Val
Model 52 Series Surge Control Valve to the system.
Schematic Diagram
Item Description
1 Hytrol (Reverse Flow Main Valve)
2 CV Flow Control (Opening)
3 CSC Swing Check Valve
4 CGA Ange Valve (Closing)
Optional Features
Item Description
P X141 Pressure Gauge
V X101 Valve Position Indicator
Typical Applications
CLA-VAL
50-01/650-01
Surge Relief Valve
Isolation
Valve
Pump
TANK
81-07/681-07
Booster Pump
Check Valve
CLA-VAL 61-02
Pump Control Valve
CLA-VAL 81-07
Check Valve
CLA-VAL 52-03/652-03
Surge Anticipator Valve
Pump
Discharge To
Atmosphere
Discharge To
Atmosphere
Discharge To System
Pressure Sensing Line
Deep Well Pump
This valve should be an integral part of any well designed pumping
system. It is used to prevent damaging and sometimes expensive
flow reversal.
Booster Pump
Install on the discharge of booster pumps to prevent re-
turn flow into tank when pump is off. Relief valve as shown
is good practice to minimize surges when pump stops.
81-07
(Full Internal Port)
681-07
(Reduced Internal Port)
MODEL