22
9.5 Assembly
Place mica packets (surface with mark “Wasserseite” (water side) towards the
medium)!
•
Grease cover and holding screws (12,15) with suitable lubricant.
•
For installation order see cross section of level gauge.
•
Tighten the combination cover/holding screws up to PS=50 bar (7, 13) as well as the
cover screws starting from PS=80 bar (13) in several steps using successively opposite
diagonal tightening (see table chapter 8.1) from top to bottom (see table item 9.6) until
tightening torque
Md
max
is reached.
•
For commissioning, see item 8.
9.6 Tightening torques
Allowable
pressure
PS
[bar]
Thread size
[mm]
Tightening torque
Md
→
Md
max
[Nm]
in steps
1
2
3
4
5
6
100
M16
50
80
110
140
160
180
200
M20
70
110
160
200
240
280
10. Shutoff valve
Type marking:
A
2
20, 40
Shutoff valve
No. of shutoff possibilities
Serial no.
10.1 General Information on the Shutoff Valve
IGEMA shutoff valves are mostly maintenance-free and easy to handle. All IGEMA valves are
equipped with metal gaskets, the valve spindles are sealed with a gland packing. The shutoff
valve versions go from simple shutoff (designation A1--) to double shutoff (designation A2--).
All main valve spindles are equipped with a quick closure function that ensures that the valve
can be opened or closed with a ⅓ turn.
10.2 Functional principle
Handle/handwheel rotated clockwise: shutoff valve is closed.
Handle/handwheel rotated anticlockwise: shutoff valve is opened.
Tools to increase hand torque are not permitted.
