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5.3 Shutdown
• Close the air valve of the pump and shut off the supply air.
CAUTION
• There is no problem in shutting down the pump with the flow valve closed while air is being
supplied; however, if this condition continues for many hours while there is nobody watching
the pump, it may continue running when there is a leak from the pump or piping, and fluid
may continue flowing out of the position of leakage. Upon finishing your work, release the
internal pressure from the pump and close the air valve (see “5.4 Releasing the pressure”).
• When the pump is shut down while pumping slurry, particulate matter contained in the
slurry will be deposited and get stuck inside the out chamber. If the pump is started again
as-is, the diaphragm may be damaged or the center disk may be overloaded, and this may
cause damage such as bending of the center rod. After finishing your work, purge the
remaining fluid from the pump (see “6. Method of cleaning”).
5.4 Releasing the pressure
1) Make sure that the air valve of the pump is closed.
2) Shut down the air compressor or close the valve on the air-supply side of the peripheral equipment.
3) Close the flow valve on the discharge side, start slowly opening the drain valve, and discharge the fluid
under pressure.
4) Open the air valve of the pump, start running the pump, and discharge the remaining air.
5) After making sure that the pump has been shut down and the pressure has been released, fully open
the regulator, and close the air valve and drain valve of the pump.
CAUTION
• Keep a vessel below the relief valve to catch any drain off.
• Fluid under pressure will gush out as soon as you open the valve, so be careful.
• If the pump will be unused for a prolonged period, purge and clean the pump (see the
Operating caution on P.3).
