1.1 The DW range
This manual covers all sizes of standard DW and DWE pumps as
well as high temperature pumps. Check the nameplate of the pump
to ensure that you have one of the above versions.
1.2 The DW Pump, options and extras
The following standard options are available in the DW range:
- Bareshaft pump
- Pump with constant speed geared motor, suitable for inverter
drive use. Up to 37 kW these are available with stainless steel
motor shroud.
- Pump with geared motor with constant or manually variable
speed.
- Pump base plate and coupling guard in stainless steel.
- Lobe rotors suitable for max. 110°C or max.180°C product
temperature, in stainless steel 316L or Non Galling Alloy (NGA).
- Piston rotors suitable for max. 110°C product temperature, in
stainless steel 316L or NGA.
- Elastomers in EPDM, FPM (Viton) or ISOLAST
TM
.
- Single mechanical shaft seal in SiC/Carbon or SiC/SiC, flushed
or non-flushed.
- Double mechanical shaft seal in SiC/Carbon or SiC/SiC .
- Single EPDM lip seal for DW1-5.
- Triple PTFE lip seal (confectionary) for DW1-5.
- Packed gland with sealing thread in PTFE impregnation, for DW1-5.
- Horizontal or vertical suction and discharge ports.
- Rectangular inlet.
- Cooling/heating jacket on rotor case and front cover.
- Pressure relief valves on DW1-5.
1.3 Identifying the pump model
Example - See fig. 1.
ORDER NO: The APV order number of the pump
TYPE: Indicates the type of pump; in this case DW3/017/20
017: displacement volume in l/100 rpm
20: max. allowable differential pressure in bars
SERIAL NO: Indicates the serial number of the pump
YEAR: Indicates year of manufacture
TEMP 110: Max. product temperature in °C.
MAX. BAR 20: Max. differential pressure in bars
1.4 Indentification of motor
The motor is identified by means of the nameplate of the motor.
1. Introduction to the DW range
Fig. 1
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