Accessories; Unions - Grundfos ALPHA1 15-50 Bedienungsanleitung

11. Accessories

11.1 Unions

Union nut with internal
threads
Rp
3/4 1
25-xx 529921 529922 529821 529925 529924
G 1 1/2
25-xx N 529971 529972
32-xx 509921 509922
G 2
32-xx N
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
10226-2 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. 31.
Rc
R
R
G
Fig. 31 Examples of thread types and combinations
Product numbers, unions
Union nut with Ball valve with internal
external threads
R
1 1/4 1 1 1/4 3/4
519805 519806 519807 519808 519809 529977 529978 529979
509971
Rp R
Rp
Ball valve with
compression
threads
fitting
mm
Rp
∅22 ∅28
1 1 1/4
Union nut with soldering fitting
mm
∅18 ∅22 ∅28 ∅42
529995
25