4 Description of the Pump (Set)
18 of 72
HPK
Pump casing
▪
Single or double volute, depending on the pump size
▪
Volute casing (depending on the design and size with casing wear ring)
and casing cover
▪
Radially split volute casing
▪
Volute casing with integrally cast pump feet
Table 6:
Pump feet
HPKS/E
HPK-EY/SY
Pump feet below
Centreline pump feet
Impeller type
▪
Closed radial impeller with multiply curved vanes
▪
Back vanes reduce axial thrust.
Shaft seal
Due to the complex conditions in hot water systems, the use of mechanical seals not
approved by KSB shall not be covered by KSB's scope of warranty.
The following seal designs are used for hot water applications:
▪
Mechanical seal, uncooled
▪
Mechanical seal with jacket cooling
Mechanical seal, uncooled
(operating mode "E")
Uncooled, single-acting, balanced
mechanical seal
y = circulation starting from the discharge
nozzle
y
Mechanical seal with jacket cooling
(operating mode "BM")
Cooled shaft seal with single-acting,
balanced mechanical seal
▪
Cooling of seal chamber via seal
housing
▪
Venting via clearance gap
Cooled shaft seal with single-acting,
balanced mechanical seal
▪
Cooling of seal chamber via seal
housing and coolable seat ring
▪
Venting via clearance gap
x = cooling liquid ON/OFF
x