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2. Install a relief type regulating valve:
Fluctuation of supply air pressure results in fluctuation of the pump stroke rate as well as discharge
volume. Install a regulating valve to maintain the air pressure at a fixed level. Select the regulator
based on the air consumption rate of the pump. Pressure drop rating of the regulator should be less
than 2.8 PSI (0.2 kgf/cm
2
).
3. Install a safety valve:
Install a safety valve after the air pressure regulator to prevent the supply air pressure from exceeding
recommended maximum ratings.
4. Installation positions of regulating valve and 4-way solenoid valve.
Install these valves as close to the pump as possible, in consideration of operating efficiency and
pressure loss. Be sure to select valves that meet the air consumption rate of the pump. All pneumatic
components should be full port, unrestricted style. Install solenoid valves in an area where vapors or
liquids cannot harm them.
5. Installation of air exhaust port:
The exhaust ports of the air circulation system and the 4-way solenoid valve must be installed in correct
positions so that the exhaust air is released into the open air.
CAUTION! Narrowing the air exhaust port may restrict the air exhaust out of the pump. As
a result, the bellows may fail prematurely.
6. Measure to minimize air exhaust:
To minimize the noise of air exhaust, connect the exhaust port with a duct or attach a silencer on the
exhaust port.
7. Installation of multiple pumps:
The total air consumption of pumps installed on a common air supply line must be considered to ensure
adequate air volume/pressure supply. The diameter of the pipe must be determined taking into
consideration the total number of pumps and total air consumption.
8. Recommended use of quick exhaust valve:
As shown in Figure 9, the air exhausted out of the pump flows out of the system via the exhaust port of
the electromagnetic valve.
Depending upon the liquid handled, some permeated gas may be mixed into the exhaust air. (The inside
of the 4-way solenoid valve may be corroded and damaged by such permeated gas.) In such a case,
install a quick exhaust valve between the pump and the 4-way solenoid valve. The air will be exhausted
through the exhaust port of the quick exhaust valve, as shown in Figure 9. (A limited volume of air
will be exhausted through the 4-way solenoid valve.)
Note: The pump may be operated without quick exhaust valves, however air exhaust lines should be
kept as short as possible with no restrictions to reduce piping resistance.