Grundfos DN 10, Installation And Operating Instructions Manual

Page: 14 / 20

English (GB)
14
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.
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.
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.
Fig. 18 Shut-off valve
8. Spare parts
Flexible copper lines for Cl
2
Flexible stainless-steel lines for NH
3
und SO
2
Connection valves
Shut-off valves
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
Fig. 19 Connection valve
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 .
Set
Shut-off
valve
Product No
2 external flat gaskets, 4 internal
packings
DN 15 96688716
DN 25 96688717
Caution
Danger of corrosion when assembling moist
parts!
T
M
04
86
07
41
12
Pos. Description
1 Upper part of body
2 Flat gasket
3 Lantern
3a Packing
4 Pressure disc
5 Piston
DN
[mm]
F
[mm]
L
[mm]
H
[mm]
A
[mm]
Weight
[kg]
Product
number
15 95 130 105 100 2.5 96706445
25 115 150 120 120 4.15 96706446
A
F
H
L
DN
2
1
3a 4
2
5
3
Material Length [m] Product No
Copper
1 96688686
2 96690366
Material Length [m] Product No
Stainless steel
1 96688690
2 96688691
Set Valve size Product No
5 gaskets for
connection
valves
1 1/4" 95702615
G 1/2 (copper line) 95717254
1", G 3/4 96681161
1.03" - 14, yoke, closed 95707704
Yoke, open 98026856
G 5/8, W 21.80x1/14 95707417
Set
Shut-off
valve
Product No
2 external flat gaskets, 4 internal
packings
DN 15 96688716
DN 25 96688717
TM0
4
861
0 41
12
Pos. Description
1 Lock nut
2 Spindle
3 Gland
4 Valve body
43.5
4
3 2
1