Cycle Stop Valves

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Cycle Stop Valves
1 through 161 GPM to 10,000 GPM
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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
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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.

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Operating and Maintenance Concerns using Cycle
Stop Valves

• Cannot have trash in your water
• Do not allow to freeze
• Maximum differential pressure 125 PSI

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Differential PressurePump dead head or shut
off pressure static water level valve set
pressurelt 125 PSI
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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
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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.
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Requirements for submersible pumps and motors
using Cycle Stop Valves.

• Minimum cooling flow for de-rated motors is
  required.

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Choking back on pumps with centrifugal impellers
Reduces Horse Power, RPM doesnt 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
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Choose a pump for your application
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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
_______
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ExampleRequired 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
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Pick a pump that will deliver the head and flow
required. 60 PSI 138 at 180 GPM
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Pick a pump with a good drop in brake horse power.
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Pump Dead Head Pressure 80 PSIPressure Switch
Shut Off 60 PSICycle Stop Valve
50 PSIPressure Switch On 45 PSI
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Make sure pump dead head pressure is at least 10
PSI higher than pressure switch shut off pressure
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Make sure pump dead head pressure is no more
than 125 PSI higher than Cycle Stop Valve
setting.
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Choose a Cycle Stop Valve to match the pump.Use
Easy Selection Chart to match pump flow rate to
valve flow rate.
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Easy selection chart is good rule of thumb.
Pump Max Flow is 180 GPM. 3 CSV3B is good
from 5 to 300 GPM.
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Confirm Max Pressure, Max Differential Pressure,
Adjustment Range, and Actual Friction
LossValve Sizing ChartKeep Less than 5
PSI
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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.
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Specifications Page gives Pressure Range, Flow
Range, Friction Loss, and Dimensions for the
different valves available.
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PressuresFlow RateDimensionsFriction
LossRetainer Dimensions
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Minimum Friction Loss
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Valve Sizing ChartKeep Less than 6 PSI
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CSV1 and CSV3 Valve are Constant Pressure
ValvesCSV1W, CSV1Z, and CSV2W have Reduced
Pressure Fall Off
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Reduced Pressure Fall Off means that you will see
11 PSI less when using 20 GPM than when using 1
GPM.
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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
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Max Differential PressureMin Friction
LossReduced Pressure Drop
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PressuresReduced Pressure Fall Off
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PressuresReduced Pressure Falloff
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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.

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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.
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Minimum run time calculator on www.cyclestopvalves
.comhelps size tank for worst case scenarios.
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Worst case cycles per day with a 2 GPM leak.
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If worst case cycles per day are more than
allowed by motor manufacturer, use larger or
additional tanks.
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119 gallon tank causes 95 cycles per day, then
two 119 gallon tanks reduces cycles to 47 per day.
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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.
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Install CSV in the well or before the pressure
tank
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With 2 and larger valvesinstall pressure tank
within 10 of CSV
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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
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Never Tee before the Cycle Stop Valve.All Water
must go through the CSV before going to the use
or the tank.
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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.
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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.
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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.
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In the well pressure tank with Cycle Stop Valve
and pitless adapter
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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.
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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.
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Dry Run Rapid Cycle Protection
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Other Dry Run relays will not work with Cycle
Stop Valves
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Other brands see low amperage from CSV as Dry Run
and shut down when they should not
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Cycle Sensor has adjustable underload, knows the
difference between low amps and Dry Run
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Shuts pump off from Rapid CycleCan see bad
tank, broken check valve, bad pressure switch, or
malfunction with CSV
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1/3 to 2HPWires like standard pressure
switch3- 15 HP single phasewires to deluxe
control box
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1 to 500 HP Three PhaseWires to Magnetic
Starter
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