Page 45 - Jet Pumping Station

The Bypass Pressure Regulating Valve prevents system pressure The bypass line should be as large as the ports of the
from exceeding a preset maximum. As the system approaches regulating valve. Do not install shutoff valves or other
this maximum pressure, excess fluid is bypassed (to a supply restrictions.
tank, or to the pump inlet). This prevents overpressurization and Install a high-quality industrial pressure gauge in the
system failures. discharge system to monitor system pressure. Failure to do
INSTALLATION so may result in overpressurization and premature failure of
Location pumping system components.
Install the regulating valve between the pump outlet (as For smoothest operation and minimal pressure spiking
close to the pump as possible) and any shut-off device in the when the discharge system is closed (closed gun, plugged
discharge plumbing. It may be located in the discharge line, or off- nozzles, valve closed), 10% of the rated flow of the
line: regulating valve should be bypassed at all times.
• If in-line, use either of the horizontal ports as the inlet and the EXAMPLE: With the C22A valve (rated to 10 gpm), 1
other as the outlet; gpm should be bypassing at all times during operation.
• If off-line, use either of the horizontal ports as the inlet and If the desired spray gun delivery is 6 gpm, then the
plug the other one. pump should deliver 7 gpm (6 gpm to the gun and 1
The bottom port is always the bypass port. gpm to be bypassed). The nozzle orifices should be
Mounting Position properly sized for 6 gpm delivery at the desired
The preferred mounting position is vertical with the adjusting bolt pressure; the pump RPM for 7 gpm; and the pump HP
at the top. for 7 gpm at the bypass pressure (bypass pressure is
Connections higher than nozzle pressure). [Bypass not required on
For best operation, the bypass line should return to the C22, C23, and C24 "AD" series valve]
supply tank. If you must plumb the bypass line back to the pump
inlet instead, have it enter the inlet line as far from the pump as PRESSURE ADJUSTMENT
possible. Contact the pump manufacturer, as a pressure regulator Systems with Shutoff Guns or Valves
may be required in the pump inlet. 1. Turn off the system.
2. Turn the adjusting nut counterclockwise until there is
no longer any pressure on the springs in the regulating
valve.
3. Close the discharge line.
4. Be sure the piping and all valves and nozzles are open.
With an accurate pressure gauge installed in the
system, start the system and let it run for a few minutes
to remove any air.
SPECIFICATIONS 5. When all air has been removed, begin turning the
PRESSURE RANGE: adjusting nut clockwise until the desired bypass
Model C22AD (3-10 gpm) 50-200 psi pressure is reached. Do not exceed the maximum
Model C22AA (3-10 gpm) 200-500 psi rated pressure of the pump or the regulating valve!
Model C22AB (3-10 gpm) 500-1000 psi
Model C22AC (3-10 gpm) 1000-1500 psi 6. Open and close the discharge line 3 or 4 times. Re-
Model C23AD (10-20 g pm) 50-200 psi check the bypass pressure each time, and readjust if
Model C23AA (10-20 g pm) 200-500 psi necessary. Turn the adjusting nut clockwise to increase
Model C23AB (10-20 gpm) 500-1000 psi or counterclockwise to reduce the pressure.
Model C23AC (10-20 gpm) 1000-1500 psi
Model C24AD (20-40 gpm) 50-150 psi 7. Check that the fluid bypass is continuous and
Model C24AA (20-40 gpm) 100-300 psi adequate. With guns or valves open, you should be by-
Model C24AB (20-40 gpm) 300-1000 psi passing about 10% of the rated flow of the regulating
Model C24AC (20-40 gpm) 1000-1500 psi
DIMENSIONS: valve (see the Example above). If the system
Model C22A 3.4" L x 6.0" H x 2.2 "W discharge pressure is less than desired when 10% of
Model C23A 4.8" L x 7.0" H x 2.8" W the flow is bypassing, check the pump speed and
Model C24A 5.4" L x 9.0" H x 3.3" W delivery and the size of the nozzle or system orifice.
WEIGHT:
Model C22A 3 Ibs 8. When both the bypass pressure and the flow have
Model C23A 5-1/2 Ibs been set, turn the locknut clockwise to lock in the
Model C24A 9-3/4 Ibs adjustment. The regulating valve has a hole through
STANDARD PORTS: the body near the inlet port, and a hole through the
Model C22A 3/4" NPT
Model C23A 1" NPT adjusting nut. When the pressure is set, tie a wire
Model C24A 1-1/4" NPT through these holes and seal it, to prevent
MATERIALS OF CONSTRUCTION readjustment.
(Other materials available on special order):
Body: Brass
Stainless Steel (Model C24 only)
Plunger Ball: Stainless Steel – 316 or 17-4 HT, Ceramic
Valve Seat: Stainless Steel – 316 or 17-4 HT,
Tungsten Carbide

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