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Cycle Stop Valves. 1 ” through 16 ” 1 GPM to 10,000 GPM. Using a Cycle Stop Valve, the flow rate from this pump will exactly match 1 or 100 sprinklers so, an 86 gallon tank can replace 10,000 gallon tank. Questions about Pump Control Valves. Resting Pumps and Motors?

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cycle stop valves
Cycle Stop Valves

1” through 16”1 GPM to 10,000 GPM


Using a Cycle Stop Valve, the flow rate from this pump will exactly match 1 or 100 sprinklers so, an 86 gallon tank can replace 10,000 gallon tank

questions about pump control valves
Questions about Pump Control Valves
  • Resting Pumps and Motors?

Pumps are made for continuous duty, they never need to rest.

  • Soft Start Equipment?

CSV has a mechanical soft start and stop but, soft starter can be used to reduce end rush.

  • Back Pressure?

Back Pressure does not hurt pumps. Pumps only think they are in a deeper well.

  • Minimum Flow?

Pumps need very little flow to remain cool. Derated motors also need very little cooling.

  • Cavitation?

Recirculation not cavitation happens at low flow. Good impellers with high tensile strength will resist wear from recirculation.

operating and maintenance concerns using cycle stop valves
Operating and Maintenance Concerns using Cycle Stop Valves
  • Cannot have trash in your water
  • Do not allow to freeze
  • Maximum differential pressure 125 PSI
Differential PressurePump dead head or shut off pressure– static water level – valve set pressure<= 125 PSI

Example; Back Pressure & Differential PressurePump Dead Head in PSI = 250 PSIStatic Water Level 150’ = 65 PSI250 – 65 = 185 PSI Max inlet pressure or back pressureAll pipe and fittings before the CSV will see 185 PSI If you have 185 PSI coming into the CSV and the CSV is set at 60 PSI then 185 – 60 = 125 PSI differential pressure through the CSV.Differential Pressure must always be less than 125 PSI


If differential pressure is more than 125 PSI, use two or more valves to stair step the pressure down to the required pressure.Example; Differential Pressure is 200 PSI, max inlet pressure is 250 PSI and system requires only 50 PSI.First valve sees 250 PSI and is set for 150 PSI.Second valve sees 150 PSI and is set for 50 PSI.This gives 100 PSI differential through each valve.

requirements for submersible pumps and motors using cycle stop valves
Requirements for submersible pumps and motors using Cycle Stop Valves.
  • Minimum cooling flow for de-rated motors is required.

Choking back on pumps with centrifugal impellers Reduces Horse Power, RPM doesn’t need to change.(note constant 3450 RPM and Power required still changes from 10 HP at 200 gpm to 4 HP at 50 gpm)

Valve Outlet Pressure

Horse Power


Required Flow in GPM ________Required Pressure at use ________Depth to pumping level ________Elevation from pump to use ________Friction loss in pipe and valves_______ Pump Dead Head ________ Static Water level _______


Example;Required Flow in GPM 180Required Pressure at use 50Depth to pumping level 0Elevation from pump to use 0Friction loss in pipe and valves 10Total pressure from pump 60 Pump Dead Head 80 Static Water level 0


Pump Dead Head Pressure 80 PSIPressure Switch Shut Off 60 PSICycle Stop Valve 50 PSIPressure Switch On 45 PSI

Choose a Cycle Stop Valve to match the pump.Use Easy Selection Chart to match pump flow rate to valve flow rate.
Easy selection chart is good rule of thumb. Pump Max Flow is 180 GPM. 3” CSV3B is good from 5 to 300 GPM.
Confirm Max Pressure, Max Differential Pressure, Adjustment Range, and Actual Friction LossValve Sizing ChartKeep Less than 5 PSI

Friction Loss for CSV3B is 14 PSI.When there is less than 100 PSI differential pressure, the cover spring can be removed which decreases friction loss to 7 PSI.7 PSI friction loss means the pump must deliver 57 PSI to get 50 PSI at max flow rate.Friction loss with Cycle Stop Valves only applies at maximum flow rate.

Specifications Page gives Pressure Range, Flow Range, Friction Loss, and Dimensions for the different valves available.
CSV1 and CSV3 Valve are Constant Pressure ValvesCSV1W, CSV1Z, and CSV2W have Reduced Pressure Fall Off
Reduced Pressure Fall Off means that you will see 11 PSI less when using 20 GPM than when using 1 GPM.

Reduced Pressure Fall Off has nothing to do with Friction LossJust means the CSV must be set at 61 PSI while using 1 GPM, to get 50 PSI for a 20 GPM sprinkler zone

determining tank size with cycle stop valves
Determining Tank Size with Cycle Stop Valves
  • No tank is needed when used with a pump start relay and a pressure relief valve
  • Pressure switch systems can use tank sizes from 5-30 gallons of drawdown
  • Water towers, large hydro tanks, and racks of bladder tanks can still be used if present or required.
  • Larger systems with a continuous use of 5 gpm or more can use smaller tanks than other systems with intermittent use.

Only when required system flow is less than minimum for CSV will pump be allowed to cycle.Example; CSV3 has 5 GPM minimum and the system has a 2 GPM leak.Tank size is very important.

If worst case cycles per day are more than allowed by motor manufacturer, use larger or additional tanks.
119 gallon tank causes 95 cycles per day then two 119 gallon tanks reduces cycles to 47 per day
119 gallon tank causes 95 cycles per day, then two 119 gallon tanks reduces cycles to 47 per day.

When required system flow is greater than minimum flow for CSV, the pump will run continuously.I.E. CSV1 has 1 GPM minimum CSV3 has 5 GPM minimumSystem never gets below 7 GPM usage.Tank size is not important as pump will run continuously.


Multiple Pumps work together by simply staggering pressure settings.Pump #1) 5 HP SubOn at 70 off at 80 PSIPump #2) 50 HP TurbineOn at 60 off at 70 PSIPump #3) 75 HP TurbineOn at 50 off at 60 PSI

Never Tee before the Cycle Stop Valve.All Water must go through the CSV before going to the use or the tank.

Pressure Switch placement is very important.Switch must be as close to the tank as possible.No elbows or tees between the switch and the pressure tank.


Water line going to the tank should never be larger than the tank inlet connection.I.E. 1.25” elbow under tank means no larger than 1.25” pipe from main line to tank.

Some tanks have 1.25” elbow with ¾” hole going into tank.These type tanks will not work properly.Use tanks with full port inlet.

In well pressure tank only holds 3/4 of a gallon.These tanks work great like any other small tank as long as there are no leaks in the water system.


If there are leaks in the system, add an additional or larger tank.This keeps the pump from having to start every time ¾ of a gallon has leaked out.See Tank Calculator on our web page.

Shuts pump off from Rapid CycleCan see bad tank, broken check valve, bad pressure switch, or malfunction with CSV