3-4
Note
Always keep the liquid level in the tank (oil tank) above the Minimum liquid
level.
Keep the suction port of the pump at least 38 mm away from the bottom of
the tank (oil tank).
(21) To hoist the pump, install an eyenut and a hexagon head bolt at two (diagonally-located) mounting
holes of the pump, and pass a rope or the like through the
eyenuts.
Eyenut size: M10,
Bolt size: M10 x 25L (nominal length [length below the head]: 25
mm)
(22) Before installing the pump to equipment, place crossties (with
enough height to remove the hexagon head bolts) between the
pump flange surface and pump mounting surface as shown in
the right figure, and remove the eyenuts and hexagon head
bolts installed for hoisting. Afterwards, pull out the crossties and
install the pump.
Caution
When installing the pump, do not put your hands between
the pump flange and the pump mounting surface.
Otherwise, it may lead to an injury.
3.4 Precautions for piping work
(1) The pipes must be as short and straight as possible with minimal joints and valves. Use pipes
whose bore size is equal to or larger than the discharge port of the pump. If the piping size is small
or there are many bends, the discharge rate may become low.
(2) Ensure to provide adequate pipe supports so that the weight of the piping system will not be
applied directly to the pump body.
Caution
Do not allow the weight of the pipes to rest on the pump.
Otherwise, the main shaft may be displaced from the center, thus leading
to equipment damage, vibration, or noise.
(3) Do not forcibly screw a pipe into the pump. Otherwise, it may break the joint.
(4) Securely connect the pipes so that the connections are kept completely airtight without leakage.
Prevent leaks of liquid and air with seal tape, liquid packing, or other means. Firmly wind the seal
tape while paying attention not to block the piping.
(5) Use a tank (oil tank) with as large a capacity as possible.
* It is recommended to use a capacity of at least three times the discharge volume per minute.
Too small a capacity may cause problems such as the rise of liquid temperature, pump damage
caused by the suction of cutting powder etc., and lower discharge rate caused by bubbles.
When you supply a pumping liquid into a tank (oil tank), gently pour it to prevent the introduction of
air.
(6) Do not allow a large amount of cutting powder, dirt, or other contaminants from entering the pump
section. Otherwise, it may damage the pump or significantly deteriorate the performance. Pass
liquids through a net cage, chip conveyor, magnetic separator, or other devices and treat them
according to the following table before supplying them to any coolant pumps for use.
Pumps that can be used for liquids after
the primary treatment
Model VKP-e
Pumps that can be used for liquids after
the secondary treatment
Model VKN-e
Crosstie
(Height: at least 35 mm
Eyenut
Pump mounting
surface
Hexagon head bolt
Mounting hole
Install at two
diagonally-located
positions.
