KM 251 en
50 15.720148-V1.0
11 Spare Parts
Manufacturer recommendation
We recommend that you keep some spare parts in stock to ensure that worn parts can be
replaced quickly when necessary.
Two spare parts are required for double pumps.
A spare part includes the following parts:
1b 2 Flat gaskets
3a, 3b 2 full valves (for plastic valves DN8), or
inner parts for 2 valves (for plastic valves DN20 and stainless steel valves)
Q 1 dosing diaphragm (for pumps without MBS), or
1 diaphragm set (for pumps with MBS), consisting of diaphragms, intermediate disk, foils,
covering rings and clamping sleeves
Order numbers
Order numbers for spare parts can be found in the table below or can be obtained on
request by indicating the device name of the pump. If you already have a spare part set,
you can reorder it using the same number.
Permissible
storage temperature
-10 °C to +50 °C
Permissible
humidity
Relative: 80%, maximum
1b
3b
3a Q
Order
number
Pump
type
Pressure
Nominal width/Valve material
Version
Housing 1) Balls Seat Gasket
553-250 251 DN 8 1.4401 PTFE Viton Grace version
553-251 251 25,00 bar DN 4/8 Stainless steel PTFE Viton
553-253 251 DN 8 PVC Glass Viton Viton single
553-253-6 251 DN 8 PVC Ceramics Viton
553-254 251 16,00 bar DN 4/8 1.4401 Viton Viton
553-255 251 DN 8 Hastelloy C Hastelloy C Viton
553-256 251 DN 8 PP Glass Viton Viton
553-257 251 DN 8 PTFE PTFE PTFE
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