Pump Solutions Group Neptune Solenoid-driven Diaphragm Metering Pump ARPZ-31_61_12 - Manual (Page 21)

20
Installation
Nut
Retaining ring
Nut
Retaining ring
PE tube
PVC braided hose
PE tube
(1/4”×3/8”)
PVC braided hose
(1/4”×3/8”)
■PVC braided hose/PE tube
• When bending the hose/tube, provide sufficient leeway in the bending so that the hose/tube will not break. Also
ensure that it will not be rubbed against or trodden on.
• Insert the hose/tube firmly so that it will not become disconnected, and tighten the nuts securely. Do not excessively
tighten the nuts. Doing so may damage or break the joint.
• If the temperature of a liquid or ambient temperature is higher than room temperature, the tightening force will be
reduced, and the hose/tube may become disconnected. After operation has started, tighten up the nuts as appropriate.
• When tightening the nuts, hold the hose/tube to prevent it from being twisted. The joints and other areas may be loos-
ened by the return force of the hose/tube.
• The pump comes with a 5-meter long hose/tube for both the discharge side and suction side. When longer hose/tube
is used, the pressure loss may exceed the pump’s maximum discharge pressure so thicker hose/tube will be required.
Provide details on the (1) viscosity of the liquid, (2) length of the pipes (how they are positioned) and (3) specific grav-
ity of the liquid to a TACMINA representative who will select the appropriate hose/tube size.
• When disconnecting the hose/tube for jobs such as maintenance and then afterwards re-connecting the same hose/
tube, cut about 10 mm off the end of the hose/tube before re-using them.
Connecting
Model for injection of sodium hypochlorite: PZ-31/61/12-CL
■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 a chemical greatly exceeding the pump’s rated discharge volume is being fed (prevention of overfeed)
✽ Even with a rising pipe, overfeed may occur if the pipe is too long.
(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 holding
the body, the threaded part on the nozzle may be damaged.
NOTE
<For maintenance>
It is recommended that the tube be attached to the main pipe through a
valve to enable the anti-siphon check cap 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
Injection point
(Rc1/2)
Main pipe
Nozzle grip
Nut
Duck-bill cap
✽ Do not remove this.
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