Pressure Pump Control Valves
/ CSV1Z / CSV2W General Information
The Cycle Stop Valve model CSV1W, CSV1Z,
and CSV2W are pump control valve that automatically adjust
pump output to match
variable flow requirements. Downstream of the CSV1W, CSV1Z,
and CSV2W, pressure remains constant as long as demand is between
the upper and lower limits of the valve. The 1" CSV1W
and CSV1Z handle from 1-25 GPM and the 1 1/4" CSV2W handles
from 5-50 gpm.
As flow rates vary, the change in pressure causes the valve
inside these models to modulate closer to or farther away from
the valve seat. This enables the pressure downstream of the
CSV to remain constant depending on pressure fall off.
When there is no longer any demand on
the system, the pressure begins to rise and the valve is
pressed against the valve seat.
The valve and seat are designed to never be able to completely
seal. The non-closing seat is sized to allow flow of approximately
1 gpm on the 1" valves or 5 gpm on the 1 1/4" valve.
As this flow continues past the seat, water begins to fill
the pressure tank downstream of the CSV. As the pressure tank
slowly fills, the system pressure will slowly rise to pressure
switch shut off. (Note: Pressure switch shut off pressure must
always be higher than the constant pressure held by the CSV).
of tank size, when the tank fills, the pressure downstream
of the CSV rises to pressure switch shut off point
and the pump will be shut off. As flow is again demanded from
the system, the pressure tank will empty and the pressure switch
will start the pump.
Model CSV1Z and CSV1W are dual threaded
and are available in 1" female NPT/1 1/4" male NPT. The "Z" model
is adjustable from 15-150 PSI, the "1W" model is
preset to 60 PSI and is adjustable from 40-100 PSI. The CSV2W
is available in 1 1/4" female NPT thread and has pressure
settings available from 25-75 PSI or 50-120 PSI. There can
be no more than 125 PSI maximum differential pressure across
any of these valves. (Difference in pressure between inlet
pressure and outlet pressure).