- 16 -
No.
Points to be Observed
Description
5
™
Liquids to be handled with care
· Stripper
· Hydrazine
· Fuming sulfuric acid
· Solvent type liquids
¡
Some types of strippers may cause cracks in bellows or piping
(PFA) at an early stage. (Contact Iwaki for a different warranty
period applied for such liquids.)
¡
Explosion-proof specifications are required to use solvent type
liquid. (Contact Iwaki for details.)
6
™
When stopping pump operation, do
not close discharge valve before
releasing all pressure from bellows.
Caution
Stopping pump without releasing pressure on pump discharge
side may result in deformed bellows due to force of pressure
remaining on pump discharge side.
9
™
Do not supply air to both right & left
air supply ports when pump opera-
tion is suspended.
Caution
¡
If air is supplied simultaneously to two air chambers on right & left
sides while pump operation is suspended, bellows are pressurized
& will finally deform.
¡
Be especially careful when using double solenoid electromagnetic
valve, because some types of valve cause simultaneous
pressurization of two air chambers between valve stops.
10
™
Do not close the secondary-side air
valve upon stopping the pump.
Caution
¡
If the secondary-side air valve on the liquid line is closed upon
stopping the pump, the resulting residual pressure in the bellows
may cause a deformation of the bellows or connecting plate.
¡
Note that the secondary-side air valve is kept open except for the
purpose of drainage.
7
™
Do not suspend pump operation for
a prolonged period without first
removing the liquid from the pump
chamber.
Caution
Suspending pump operation for a prolonged period without
removing liquid inside the pump chamber may cause corrosion of
the electrode or other parts due to permeation of the liquid’s gas
content.
(Example: Pump operated once a day for a minimum period of 10
minutes.)
In sush a case, contact Iwaki for special instructions.
8
™
Do not narrow air exhaust port. (Do
not use tubing of smaller diameter
than specified.)
Caution
If exhaust port piping of 5-port solenoid valve is extended longer
to position other than specification, & air exhaust port is narrowed,
bellows may be deformed by force of supply air resulting from
imbalance between discharge side pressure & supply air
pressure.
