Cycle Stop Valves
Constant Pressure Pump Control Valves
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CSV3B Troubleshooting

Pump is cycling off and on Pilot screen is stopped up Clean screen (2003 or older models)
Pressure switch is not set correctly Cut off pressure must be at least 10 psi higher than valve set pressure.
Valve is not set correctly Reset valve to at least 10 PSI lower than cut off pressure
Debri between diaphragm and seat Clean out valve
Waterlogged pressure tank Replace tank
Bad or torn diaphragm in main valve or pilot valve Replace damaged diaphragm
Pressure modulates 10-15 PSI from set pressure Air trapped in mainline-usually occurs on new start ups and spring start ups. Release air from main line and reset CSV if necessary
Low Pressure Valve is not set correctly Reset valve
Check colored (red on 2", orange on 3" and larger) restriction fitting on pilot for enlarged, missing, or wrong color orifice. Replace worn orifice or get correct colored orifice.
Demand is more than pump can provide at desired pressure Reduce demand so it is within pump capabilities to maintain desired pressure.
Chattering valve Pressure tank is located too far away from the valve Relocate valve or tank to bring them closer together or add a second smaller tank to the system close to the valve.
Too much air pressure in tank Reduce air pressure in tank to 5-10 PSI below cut in pressure.
Worn or defective diaphragm Replace diaphragm
Pump rapid cycles at start up and then begins to function correctly Pressure switch is located on the main line. Move pressure switch to a small line at the base of the tank on a line no larger than 1 1/4" in diameter
CSV setting is too close to cut off pressure Set pressure switch cut off pressure at least 10 PSI higher than CSV setting
Air pressure in tank too high Reduce air pressure in tank to 5-10 PSI below cut in pressure
Multiple check valves in system working against each other Remove all but the check valve or foot valve on the pump itself
Cut in pressure is not the same as CSV set pressure Set pressure switch to come on at the same pressure the CSV is set to hold
Air trapped in cover or bonnet Loosen copper fitting on cover to release trapped air
More than 125 psi differential between inlet and outlet pressure of valve Reduce differential pressure or add a second valve
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Cycle Stop Valves, Inc.
10221 CR 6900
Lubbock, Texas 79407
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Fax: 806-885-1994