REPAIRS
Series 541
20/25
Edition 2015-07-09
291187ED
19. Put the flat seal (36/2) on sealing surface of valve body.
VAT recommends using a new flat seal.
In case of reutilization of the used flat seal please assemble it in the same
direction as removed before.
20. Move valve insert (in open position) carefully into body without touching the body wall.
Touching the body wall may cause severe damage to delicate parts of the insert.
21. Insert all bonnet screws (68) and screw them in until they touch the bonnet flange (do
not tighten).
22. Turn spindle in closing direction until the FLEX VATRING (Y1 or Y2) touches the seal
surface to align the valve insert (do not tighten).
23. Tighten all bonnet screws (68) gradually in crosswise order with the following torques:
DN 16: 2.5 Nm
DN 40: 7 Nm
DN 63: 15 Nm
24. Close valve to mechanical stop!
25. Tighten nut (65) with the following torque:
DN 16: 2.5 Nm
DN 40: 7 Nm
DN 63: 15 Nm
Valve is ready for use.
