Precautions For System Design - SMC Networks PB1313A Operation Manual

1. Precautions for system design

Warning
(1)Confirm the specifications.
Fully understand the applications, fluids, environment and other operating conditions to use this
product within the specified range shown in this operation manual.
(2)Applicable fluids
●If the fluid contains foreign matter, the inside of the pump will become worn out , causing
problems. Eliminate the foreign matter by using an appropriate filter (strainer).As a guide, the
appropriate filtration is 80 to 100 mesh (150 to 180mm).
●When circulating coagulable fluids, handle them carefully so that they do not coagulate in the
pump.
●Use caution so that the operating fluid does not adhere to the product outer surface.Never use
the product with the operating fluid adhering to the product outer surface.
(3)Water hammer
Sudden operation of the valve may create high pressure due to water hammer.Take measures so
that pressure exceeding the specification value is not applied.
<Countermeasures>
●Reduce the opening speed of the valve by using a water hammer cushioning valve.
●Use a material for piping such as a rubber hose or an accumulator to absorb the impact
pressure.
(4)Liquid-sealed circuit
Mount a by-pass valve to the system so that it does not
form a liquid-sealed circuit. (Figure on the right)
(5)Fluid pressure
Feeding the fluid from the suction side into the pump with pressure or drawing it with negative
pressure will cause reverse pressure to be applied to the diaphragm and the check valve, causing
shortening of the product life.
(6)Provide enough space for maintenance.
Allow sufficient space for maintenance and inspection.
(7)Provide safety measures against fluid leakage.
Take fluid leakage of the product into consideration when using. When transferring flammable
fluids or fluids which affect the human body and environment, take measures such as prohibiting
ignition sources, and prohibiting entry to the operation area. External leakage of pumping fluid
could cause serious injury.
(8)Design the circuit so that reverse flow and reverse pressure are prevented.
Reverse flow or reverse pressure may lead to damage to equipment and operation failure. Take
safety measures when designing the circuit. When installing a check valve, use the check valve
whose cracking pressure is 0.02MPa or less. Using the check valve of higher cracking pressure,
suction failure might be occurred.
Countermeasure against
liquid-sealed circuit
－6－
Pump Relief valve