Pump Solutions Group Neptune Solenoid-driven Diaphragm Metering Pump ARPZ-31_61_12 - Manual (Page 23)

22
Installation
Injection point
(Rc1/2)
Main pipe
Nozzle grip
Nut
Duck-bill cap
✽ Do not remove this.
■Anti-siphon check valve w/ duck-bill cap
This pump is provided with an anti-siphon check valve with duck-bill cap. Use this valve at the injection point unless
there is a good reason not to do so. Be absolutely sure to install it in the following cases.
• When the injection point is open to the atmosphere and liquid is to be injected at a position lower than the level of the
liquid in the tank (prevention of siphoning)
• When the liquid is to be injected inside the suction-side pipe of a volute pump, etc.
• When chemicals greatly exceeding the pump’s rated discharge volume are being fed (prevention of overfeed)
✽ Even with a rising pipe, overfeed may occur if the pipe is too long.
Connecting
(1) The anti-siphon check valve with duck-bill cap has an R1/2 external
thread. Provide an Rc1/2 internal thread at the injection point.
(2) Wind sealing tape around the external thread of the anti-siphon check
valve with duck-bill cap, and screw the valve into the injection point.
✽ If it is hard to screw the valve in, grasp the nozzle grip using a tool
such as pliers, and tighten the valve gently.
✽ When connecting the tube with the anti-siphon check valve with duck-
bill cap already mounted on it to the main pipe, be absolutely sure to
hold the valve body and turn the nut. If the nut is turned without hold-
ing the body, the threaded part on the nozzle may be damaged.
NOTE
It is recommended that the tube be attached to the main pipe through a
valve to enable the anti-siphon check valve with duck-bill cap to be replaced
or cleaned, etc.
✽ Use a valve made of materials which will resist any corrosion resulting
from the chemicals used.
Valve
Anti-siphon
check valve
with duck-bill cap
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