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Soft-packed stuffing box, ‘‘Standard’’ (N) construction.
Standard construction with 4 packing rings (461.1) used for
temperatures of the fluid pumped up to 105
0
C. The stuffing
box compartment cannot be cooled.
Soft-packed stuffing box, ‘‘Hot Water’’ (HW) construction.
Construction with 4 packing rings (461.1) and cooling of the
stuffing box compartment. Used for temperatures of the fluid
pumped in excess of 105
0
C up to 230
0
C max.
Special stuffing box, ‘‘Extra-deep’’ (V) construction.
Construction with 7 packing rings (461.1) and cooling of the
stuffing box compartment, used mainly in process industry
applications.
Special stuffing box, ‘‘VSM’’ Constructed
VSM is the abbreviation (in German) of ‘‘Extra deep with lantern
ring at the centre’’.
Construction with 5 packing rings (461.1) and one seal case
ring (458) arranged at the centre of the packing compartment;
used mainly for operation under vacuum or suction lift, and
where malodorous fluids are pumped. For operation under
vacuum, the lantern ring (458) is fed with a sealing liquid, and
it prevents the ingress of air into the pump.
Special stuffing box, ‘‘VSH’’ constructed.
VSH is the abbreviation (in German) for ‘‘Extra deep with seal
cage ring at the bottom of the box’’. The construction with 5
packing rings (461.1) and a seal cage ring (458) arranged at
the bottom of the packing compartment is used where fluids
containing abrasive particles are pumped. The flushing liquid,
which should be fed through the cage ring (458) at a pressure
of at least 1 to 4 bar (max.) above the suction pressure,
penetrates inside the pump and protects the stuffing box
packing (461.1) against abrasive substances.
1.5.1.1 Cooling Liquid for Stuffing Boxes
Treated cooling water which does not tend to precipitate salts
causing hardness out of solution should be used as cooling
liquid. The cooling water should be allowed to flow out freely
and visibly, so that it can be checked at any time in respect of
rate of flow and temperature. The temperature differential
between cooling water inlet and outlet should not exceed 10
0
C.
The max. permissible cooling water outlet temperature should
not exceed 50
0
C. The cooling water pressure should be situated
between 1 bar min. and 10 bar max.
An isolating valve should be incorporated in the cooling water
supply line, to enable the rate of flow of cooling water to be
adjusted, and the supply of cooling water to be turned off when
the pump is shut down. The cooling water should only be turned
off after the temperature of the fluid inside the pump has
dropped to below 80
0
C.
1.5.1.2 Packing the Stuffing Boxes
Caution : The pump is despatched from our works with the
stuffing boxes unpacked. An adequate quantity of packing
material is supplied loose with the pump. The stuffing box will
only be able to perform its vital function satisfactorily on
condition that it is carefully packed and properly maintained
as prescribed.
Before packing, thoroughly clean stuffing box gland (452),
packing compartment and shaft protection sleeve (524.1/.2).
Fig. 15 ‘‘Standard’’ (N) construction stuffing box
412.3
461.1
452
350
400.3
451
524.2
(524.1)
Fig. 16 ‘‘Hot Water’’ (HW) construction stuffing box
412.3 412.4 461.1
452
165
350
400.3
7A/7E
400.3
451
524.2
(524.1)
Fig. 17 Special soft packed stuffing box ‘‘Extra deep’’ (V)
412.3
412.4 461.1
452
165
350
400.3
7A/7E
400.3
451
524.2
(524.1)
Fig. 18 Special stuffing box VSM
Fluids pumped :
Operation under vacuum
or pumping of malodorous
fluids (ammonia and
solvents).
Sealing liquid consumption
1 to 3 litres/hours approx.
412.3 412.4 461.1
452
165
350
400.3
10A/10E
400.3
451
524.2
(524.1)
458
Fig. 19 Special stuffing box VSH.
Fluids :
Products containing abrasive
particles, which must be kept
away from the stuffing box
packing, so as not to erode
the latter (oils containing
diatomite (kieselguhr),
fractions from catalytic
cracking containing abrasive
catalyst particles).
Flushing liquid consumption
300 to 500 litres/hour approx.
412.3
412.4 461.1
452
165
350
400.3
11E
400.3
451
524.2
(524.1)
458
5
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