Maintenance Of The Shut-Off Valve; Spare Parts; Fault Finding; Leakage At The Connection Valve - Grundfos DN 10 Installation And Operating Instructions Manual

7.4 Maintenance of the shut-off valve

Every two years, but at least when leakages occur, the gaskets
and packings of the shut-off valve must be replaced.
Set
2 external flat gaskets, 4 internal
packings
Required equipment: Hot water (approx. 40 °C) and a soft
brush.
1. Open the shut-off valve completely.
2. Depressurise the system.
3. Unscrew the nuts at the upper part of body (1).
4. Remove the upper part of body with piston (5).
5. Take the packings (3a) and lantern (3) out of the valve body.
6. Clean the valve body and all other parts. Replace damaged or
worn parts.
Danger of corrosion when assembling moist
Caution
parts!
7. Dry all parts well.
8. Insert lantern and new packings.
9. Place upper part of body with piston.
10. Screw on the nuts slightly by hand.
11. Close the shut-off valve.
12. Tighten the nuts with an open-end wrench.
A
1
2
3
3a 4
L
Fig. 18 Shut-off valve
Pos. Description
1 Upper part of body
2 Flat gasket
3 Lantern
3a Packing
4 Pressure disc
5 Piston
DN F L H
[mm] [mm] [mm] [mm]
15 95 130 105
25 115 150 120
14
Shut-off
Product No
valve
DN 15 96688716
DN 25 96688717
2
5
A Weight Product
[mm] [kg] number
100 2.5 96706445
120 4.15 96706446

8. Spare parts

Flexible copper lines for Cl
2
Material
Copper
Flexible stainless-steel lines for NH
Material
Stainless steel
Connection valves
Set Valve size
1 1/4"
G 1/2 (copper line)
5 gaskets for
1", G 3/4
connection
1.03" - 14, yoke, closed
valves
Yoke, open
G 5/8, W 21.80x1/14
Shut-off valves
Set
2 external flat gaskets, 4 internal
packings

9. Fault finding

Possible faults at the header line:
• Leakages at the connecting parts between copper line and
connection valve of the gas container.
• Leakages at the connecting part between copper line and
steel line.

9.1 Leakage at the connection valve

1
Fig. 19 Connection valve
Pos. Description
1 Lock nut
2 Spindle
3 Gland
4 Valve body
1. Unscrew lock nut (1).
2. Tighten the gland (3) with a torque of 15 Nm.
3. Retighten lock nut.
4. If the leakage still exists, install a new connection valve.

9.2 Leakage at the shut-off valve

See 7.4 Maintenance of the shut-off valve.
Length [m] Product No
1 96688686
2 96690366
und SO
3 2
Length [m] Product No
1 96688690
2 96688691
Product No
95702615
95717254
96681161
95707704
98026856
95707417
Shut-off
Product No
valve
DN 15 96688716
DN 25 96688717
4
43.5
2 3