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FLANGED CONNECTION: Flange bolts should be tight enough to slightly compress the gasket and make a good seal, without distorting or putting excessive stress on the flanges. Suitable washers should be used between the bolt head and flange and the nut and flange. Bolts should be tightened in alternating sequence.
RECOMMENDED FLANGE BOLT TORQUE. USE WELL LUBRICATED METAL BOLTS AND NUTS. USE SOFT RUBBER GASKETS. FLANGE BOLT TORQUE FLANGE BOLT TORQUE SIZE DIA. FT. LBS. SIZE DIA. FT. LBS. 1/2 1/2 10-15 2 5/8 15-25 3/4 1./2 10-15 2-1/2 5/8 20-25 1 1/2 10-15 3 5/8 20-25 1-1/4 1/2 10-15 4 5/8 20-25 1-1/2 1/2 10-15 6 3/4 30-40 INSTALLATION: It is recommended that these check valves be installed no closer than 10 pipe diameters from a pump. At least 5 pipe diameters should be between these check valves and an elbow. As in all plastic piping the maximum fluid velocity is 8 feet per second. This velocity minimizes the effects of valve closure and pump start up or shut down. REPAIR: EXTREME CAUTION MUST BE TAKEN WHEN WORKING ON THIS CHECK VALVE. THE PIPING SYSTEM MUST BE DEPRESSURIZED AND DRAINED. PROPER CARE MUST BE TAKEN. CONSULT M.S.D.S. (MATERIAL SAFETY DATA SHEETS) INFORMATION REGARDING YOUR SPECIFIC APPLICATION. To repair the valve remove the cap nut from the check valve by turning counter clockwise. Remove the plastic spring and the check element. Inspect all parts for wear and damage. Replace the o-rings . Reinstall the check element, and the plastic spring.. Install the o-ring in the body groove. Use a non-petroleum base lubricant to lubricate the o-ring and thread , and re-assemble the cap to the check valve.
PLASTIC GUIDE

Y Check Valves - 16511 BODY CAP O-RING

O-RING CPVC PVC PLUG CHECK VALVE BODY
YCIS REV B 9/7/99 ECR 819R