Install Instructions

Fastening the Viega PureFlow System
69 of 88
IM-PF 724596 1021 PureFlow Water System (EN)
12.10.4 Z-Type Expansion O󶈴set
The Z-type expansion o󶈴set integrates two 90° elbows that form a “Z”
pattern.
With this type of con󶈵guration ½ of the “L” dimension is applied to the
center area of the “Z” (represented as L1 in the table and illustration)
while ¼ of the “L” dimension would be applied to each of the top and
bottom areas (represented as L2).
Calculate the necessary L1 and L2 dimensions or use the chart below,
which was 󶈵gured using the maximum run for a single expansion
compensator (50 feet).
L = 20.7"
L1 = ½ (L)
L1 = 20.7"/2 = 10.35"
L1 = 10.35"
L2 = ¼ (L)
L2 = 20.7"/4 = 5.18"
L2 = 5.18"
L2
L2
LT
L1
∆L
∆L
Anchor point
Z-Type O󶈴set
Anchor point
L1 = 10.35"
L2 = 5.18"
L2 = 5.18"
Z-Type Expansion Example
Z-Type Expansion O󶈴set (inch) per 50 linear feet of run
Tubing
ΔT(° F)
Tube
nom.
60 80 100 120 140 160 180 200
L1 L2 L1 L2 L1 L2 L1 L2 L1 L2 L1 L2 L1 L2 L1 L2
Viega
PureFlow
PEX
¾" 10.2 5.1 11.8 5.9 13.2 6.6 14.4 7.2 15.6 7.8 16.7 8.3 17.7 8.8 18.6 9.3
1" 11.6 5.8 13.4 6.7 15.0 7.5 16.4 8.2 17.7 8.8 18.9 9.5 20.1 10.0 21.1 10.6
1¼" 12.8 6.4 14.8 7.4 16.5 8.3 18.1 9.1 19.6 9.8 20.9 10.5 22.2 11.1 23.4 11.7
1½" 13.9 7.0 16.1 8.0 18.0 9.0 19.7 9.8 21.3 10.6 22.7 11.4 24.1 12.1 25.4 12.7
2" 15.9 8.0 18.4 9.2 20.5 10.3 22.5 11.3 24.3 12.2 26.0 13.0 27.6 13.8 29.1 14.5