503.20 p.10
•
3.2.2 Main valve
valve flap (753)
To visually check the o-ring of the valve flap (754) remove cover (747) and open SAV (engage).
When inserting a new lubricated o-ring (774) into the groove of the valve flap (753) the
o-ring should initially be pressed into the groove at 3 - 4 points spaced equally along the diameter.
Only then should the o-ring be pressed in completely.
After separating the valve flap from the valve flap lever (750) the locking nut (752) must be
tightened with the correct torque and must further be secured using the splint (773).
closing springs (731)
2 grooves for receiving the closing springs are forned into the spring casing (733). The grooves
are required for the different reception of the closing springs in the desings
"right hand operation"
or
"left hand operation"
.
When inserting the closing springs, they should intially be placed into the spring casing (733).
The correct orientation of the springs as shown in figure 1 and 2 should be observed.
The closing springs are properly pre-tensioned when all 4 fastening screws (732) can be fitted to the
casing (approx. half a turn of the spring casing). The valve flap must be in the "closed" position.
•
•
•
figure 2 closing spring inserting position for
"left hand" operation
figure 1 closing spring inserting position for
"right hand" operation
Torque M
A
in Nm
DN Schrauben-Pos.-Nr.
708 732 745 752 800
3.2.3 Screw tightening moments
M
A
3.2.4 Lubricants
25/50 8 8 40 8 -
50/100 8 8 75 12 -
80/150 20 20 160 40 10
100/200 20 20 160 40 10
components lubricants RMG part no.
manual actuator thread (767) assembly paste 00 027 091
all o-rings, sliding sleeves,
sliding faces and switch elements silicone grease 00 027 081 (tube 0.1 kg)
all fastening screws
and pipe screw connections assembly grease 00 028 267
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