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2.6.5
2.7
2.8
2.9
16
• The bearing on the pressure side is axially fixed.
• The bearing is sealed by means of rubber V-rings.
Shaft seal
The shaft seal for the MCHZ is available in 2 variants:
1 MCHZ
Standardized stuffing box packing rings.
Pumps for which the pressure in the stuffing box becomes too high are designed with
a balance pipe.
2 MCHZS
Mechanical seal with bellows
Cooling and lubrication of this seal is undertaken by circulation of the pumped liquid
via a balance pipe.
Application area
The application area globally looks as follows:
Capacity
Discharge head
8 m (for water of 15°C and provided that air which is drawn
Suction head
However, the maximum allowable pressures and temperatures depend strongly on the
selected materials and components. Also working conditions may cause differences. For
more detailed information see paragraph 10.2 "Permissible pressure and temperature".
Re-use
The pump may only be used for other applications after prior consultation with Johnson
Pump or your supplier. Since the lastly pumped medium is not always known, the
following instructions should be observed:
• Flush the pump properly
• Make sure the flushing liquid is discharged safely (environment!)
Take adequate precautions and use the appropriate personal protection
means (rubber gloves, spectacles)!
Scrapping
If it has been decided to scrap a pump, the same procedure as for paragraph 2.8 "Re-
use" should be followed.
Maximum value
100 m
340 m
in is discharged without back-pressure)
General
3
/h
MCHZ/EN (0912) 4.2
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