[6]
No remodeling
Never try to remodel the pump. This may cause a serious accident or damage.
[7]
No disassembly or repair
Users are allowed to disassemble and repair the pump to the degree of the given description in "Disassembly
and Assembly" in this manual.
[8]
No dry running operation
Dry operation of the pump (pump operation without liquid inside) may cause damage to the pump internally.
Never operate the pump dry. In the case of MDE type, the sliding parts are self-lubricated and self-cooled. If
the pump is operated dry or with the suction-side valve closed, damage may result.
* Countermeasures to be taken in case of dry operation
1. Turn off the power switch of the pump immediately and leave the pump as it is for more than 1 hour.
2. Prime the pump and fill the pump with liquid.
(Note that the pump should be supplied with liquid after leaving the pump empty for more than 1 hour.
Sudden supply of liquid may cause a crack in the part due to quenching effects.)
[9]
Points to be noted when starting and stopping pump
Pay close attention to the following points to avoid water hammer action when starting and stopping pump
operation. When the discharge-side piping is very long, extra attention is required.
(1) When starting the pump, first prime it. Then, close the discharge valve completely and turn on the power
switch. After starting up the pump, open the discharge valve gradually and set it to the desired operation
level.
(2) When stopping the pump, first close the discharge valve slowly. Turn off the power switch only after
completely closing the discharge valve.
In this procedure, never try to stop the pump quickly using a solenoid valve, etc. Quick
closure may cause water hammer action, and the excessive pressure will destroy the pump.
[10]
Use of slurry liquid
Pumps can handle the pumping of slurry liquid with a density of 5wt% or less, grain size of 50 µm or less, and
hardness of 80Hs or less. Prior to pumping such slurry liquid, be sure to confirm the operation feasibility with
the supplier.
[11]
Influence of specific gravity and viscosity of liquid on pump performance
If the specific gravity or viscosity of the liquid is higher than that of pure water, the shaft power, discharge
volume, and pump head may vary somewhat. The delivered pump has been prepared to meet the specifications
ordered by the user. To change the operating conditions after delivery, be sure to contact the supplier.
- 17 -
Caution
