English (GB)
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12. Accessories
12.1 Unions and valve kits
Note: The product numbers are always for one complete set, incl. gaskets.
The product numbers for the very standard sizes are printed in bold.
* When ordering for UK 15-xx versions, use product numbers for 25-xx (G 1 1/2).
G-threads have a cylindrical form in accordance with the EN ISO
228-1 standard and are not sealing the thread. It requires a flat
gasket. You can only screw male G-threads (cylindrical) into
female G-threads. The G-threads are standard thread on the
pump housing.
R-threads are tapered external threads in accordance with the EN
10226-1 standard.
Rc- or Rp-threads are internal threads with either tapered or
cylindrical (parallel) threads. You can screw male R-threads
(conical) into female Rc- or Rp-threads. See fig. 43.
Fig. 43 G-threads and R-threads
12.2 Insulating shells, ALPHA2, ALPHA3
The pump is supplied with two insulating shells. Type A pumps
with air-separating chamber are not supplied with insulating
shells. However, you can order insulating shells as an accessory.
See table below.
The insulation thickness of the insulating shells corresponds to
the nominal diameter of the pump.
The insulating shells, which are tailored to the individual pump
type, enclose the entire pump housing. The insulating shells are
easy to fit around the pump. See fig. 44.
Fig. 44 Insulating shells
Product numbers, unions
Union nut with internal
threads
Union nut with
external threads
Ball valve with internal
threads
Ball valve with
compression fitting
Union nut with soldering fitting
ALPHA2/3
Connection
3/4 1 1 1/4 1 1 1/4 3/4 1 1 1/4 ∅22 ∅28 ∅18 ∅22 ∅28 ∅42
15-xx*
G 1
15-xx N*
25-xx
G 1 1/2
529921 529922 529821 529925 529924
25-xx N 529971 529972 519805 519806 519807 519808 519809 529977 529978 529979
32-xx
G 2
509921 509922
32-xx N 509971 529995
R
TM06 9235 2017
Pump type Product number Available
ALPHA2/3 XX-XX 130 98091786 spare part
ALPHA2/3 XX-XX 180 98091787 spare part
ALPHA2/3 XX-XX A 505822 accessory
TM06 5822 0216
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