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? 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

• Cannot have trash in your water

• Do not allow to freeze

• Maximum differential pressure 125 PSI

Differential Pressure

Pump dead head or shut off pressure – static water level – valve set pressure

<= 125 PSI

Example; Back Pressure & Differential Pressure

Pump Dead Head in PSI = 250 PSIStatic Water Level 150’ = 65 PSI

250 – 65 = 185 PSI Max inlet pressure or back pressure

All 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.

• 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)

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Submersible motor companies cooling chart only good f or motors at

f ull service f actor load

• Using Constant Pressure Valves at low flow the load on the motor is much less than f ull load. At low amperage these motors can handle hot water. So this chart is no longer valid. (see hot water next)

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•I f a Sub motor can handle hot water when de-rated as below, then it will take very little cool water to keep the motor f rom overheating? De-rated motors need much less cooling than motors at f ull service f actor load (Choking back a pump with a Constant Pressure Valve de-rates the motor load)

Choose a pump for your

application

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 180

Required 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

Pick a pump that will deliver the head and flow required. 60 PSI = 138’ at

180 GPM

Pick a pump with a good drop in brake horse power.

Pump Dead Head Pressure 80 PSIPressure Switch Shut Off 60 PSI

Cycle Stop Valve 50 PSIPressure Switch On 45 PSI

Make sure pump dead head pressure is at least 10 PSI higher than pressure switch shut off pressure

Make sure pump dead head pressure is no more than 125 PSI higher than

Cycle Stop Valve setting.

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 Loss

Valve 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.

PressuresFlow Rate

Dimensions

Friction Loss

Retainer Dimensions

Minimum Friction Loss

Valve Sizing ChartKeep Less than 6 PSI

CSV1 and CSV3 Valve are Constant Pressure Valves

CSV1W, 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 Loss

Just means the CSV must be set at 61 PSI while using 1 GPM,

to get 50 PSI for a 20 GPM sprinkler zone

Max Differential Pressure

Min Friction Loss

Reduced Pressure Drop

Pressures

Reduced Pressure Fall Off

Pressures

Reduced Pressure Falloff

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.

Minimum run time calculator on

www.cyclestopvalves.com

helps size tank for worst case scenarios.

Worst case cycles per day with a 2 GPM leak.

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.

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 minimum

System never gets below 7 GPM

usage. Tank size is not important as pump will run

continuously.

Install CSV in the well or before the

pressure tank

With 2” and larger valvesinstall pressure tank within 10’ of

CSV

Multiple Pumps work together by simply staggering pressure

settings.

Pump #1) 5 HP SubOn at 70 off at 80 PSI

Pump #2) 50 HP TurbineOn at 60 off at 70 PSI

Pump #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 the well pressure tank with Cycle Stop Valve

and pitless adapter

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.

Dry Run &Rapid Cycle

Protection

Other Dry Run relays will not

work with Cycle Stop Valves

Other brands see low

amperage from CSV as Dry Run and shut down when they should not

Cycle Sensor has adjustable

underload, knows the difference

between low amps and Dry

Run

Shuts pump off from Rapid Cycle

Can see bad tank, broken check valve,

bad pressure switch, or malfunction with CSV

1/3 to 2HPWires like standard

pressure switch

3- 15 HP single phase

wires to deluxe control box

1 to 500 HP Three Phase

Wires to Magnetic Starter