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Set-up and Maintenance for CP® Check Valves
 
CP® Check Valves are substantially different in design than standard diaphragm checks. The stainless needle seats into an o-ring in a stainless steel core. There is a Viton® diaphragm protected by a Teflon diaphragm on the needle. The cap must be tight for the check valve to work properly. Both the floater check and the split-eyelet check come with springs which open at approximately 12 psi.
The split-eyelet check body is made from glass–filled nylon. It comes in either a 3/4” or 1” size. In the box with this check there is an extra, lighter spring. This spring is included in case the check needs to open at a lower pressure or stay open at lower pressures and slower ground speeds. When using air-induction tips, especially small sizes, a brief delay in shut-off may occur. This delay is caused by air trapped in the tip.
Floater check valves and combos are made of glass-filled polypropylene. The check valve comes with either a male cam lock or 3/4” pipe body.
Aerial check valves are either glass-filled polypropylene or stainless steel.
Avoid disassembling the check valve. When a drip occurs, set the nozzle on the largest orifice or tip and pull up on the check valve needle. That should flush out debris causing the drip and it should stop. Be sure the cap is down tight. If it is necessary to open the cap, avoid contaminating the diaphragms and pull up on the needle while screwing down the cap to avoid wrinkling the Teflon seal. If the Teflon seal is wrinkled, it may cause leaking.
At the end of the season, it is good practice to replace the diaphragms and o-rings. When replacing the o-ring and diaphragms on the needle, it is critical to get the e-ring into its slot. If the e-ring is not properly seated, the check valve will not work. Replacement of the e-ring is much easier, if an e-ring tool is used.
CP Nozzle Patent #4,461,426 Check Valve Patent #5,190,074
CP Carousel Patent #5,884,847 CP Turbo Patent #6,460,783
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