6
11. Condensation and freezing of the pilot port
The air supply port of the air operated type can cool down quickly due to expansion of the supply
air, and this may cause condensation on the piping and the condensation may freeze during
operation in winter. Take measures to ensure that water droplets from condensation are not
splashed onto any electric parts or equipment.
Caution
1. Suspension of the pump operation
When operation is stopped, conbine the exhaust center 5-port solenoid valve or the 3-port
solenoid valve for residual pressure release and the 4-port solenoid valve for driving the pump to
discharge the residual pressure inside the pump when stopping it. If the pump is pressurized
during suspension, its life will become shorter.
2. Reverse flow
The check valve inside the process pump does not completely stop reverse flow (the flow from
the discharge side to the suction side). For this reason, fluid may sometimes flow from the
discharge side to the suction side when the pump is stationary, etc). As a countermeasure, install
a 2-way valve or a check valve. However, please note that when a check valve is installed, if the
cracking pressure is high, defective suction may occur. (As a guide, the cracking pressure should
be 0.02 MPa or less.)
2. Mounting
Caution
1. Read the operation manual before mounting the product.
Read the operation manual carefully and understand the contents before mounting the product.
The manual should also be kept where it can be referred to whenever necessary.
2. Confirm the mounting orientation of the product.
Face the foot downward. Fix the pump and the mounting foot with the included screws (tightening
torque: 2.5 N
･
m). Also, secure all specified mounting positions when using the product.
If the propagation of the vibration of the pump is not acceptable, insert vibro-isolating rubber when
mounting.
3. Piping
Caution
1. Flush the piping.
Flush and clean the piping before connecting the product. Any dirt or scale and the like left in the
piping may cause malfunction or failure.
2. Use fittings with resin threads when connecting piping to the product with resin threads at
the ports.
Using fittings with metal threads may cause damage to the ports.
3. Tighten screws with proper tightening torque.
When screwing fittings into the product, tighten them with proper tightening torque as shown
below. Looseness can cause problems such as fluid and air leaks, while over tightening can
cause damage to threads and parts, etc.
Connection thread
Proper tightening torque (N·m)
Port name
Rc, NPT, G
1/4”
12
～
14
AIR SUP (P1, P2)
Rc, NPT, G 1/2
”
2
～
2.5
FLUID IN, FLUID OUT
Rc, NPT, G 3/4
”
4
～
5
