Installation, Operating & Maintenance Instructions

Series 64, DN 63-400 (I.D. 21/2" - 16")

VAT Vakuumventile AG, CH-9469 Haag, Switzerland

Tel +41 81 771 61 61 Fax +41 81 771 48 30 CH@vatvalve.com www.vatvalve.com

219034EM

2013-08-27

15/19

5.1.1

Procedures

1. Precondition for all maintenance work

Vent both valve chambers

Open gate valve

Shut off air supply and electrical power

Disconnect all cables to the actuator

2. Removal of the gate assembly (4) / Replacement of the crank bolt (6) / Replacement of the bonnet seal (3)

Unfasten the bonnet screws (1)

Remove the bonnet plate (2) and the bonnet seal (3)

Pull the lever (17) a little bit out of the bonnet opening

Loosen the hexagonal socket-head bolt (7) for the crank bolt (6)

Remove the crank bolt (6), while lifting the gate assembly (4) a little bit if necessary

Slide out the gate assembly (4) carefully from the body and put it on a clean workshop place

Re-assemble in reverse direction

Fasten the screws (1) crosswise with equal torque:

14 Nm (10 lbf ft) with DN 63 - 100

18 Nm (13 lbf ft) with DN 160 - 400

3. Replacement of the gate O-ring (5)

Put a suitable tool beneath the O-ring at the venting hole and lift the O-ring carefully out of the groove (take care

that the groove will not be damaged)

Clean groove and sealing surface

Install new O-ring by pressing it crosswise uniformly into the groove. Make sure, the O-ring is

not twisted (pay

attention to the seam of the O-ring)

4. Replacement of the ball bearings (24)

DN 63, DN 160 - 200: Replace the complete ball bearing assembly (DN 63: 1 pc, DN 160 - 200: 2 pcs)

DN 100, DN 250 - 400: Replace each single ball bearing and pull out the its centre ring (4 pcs)

5. Replacement of the locking balls (21)

Put the gate assembly (4) carefully on a clean workshop place with the O-ring side to the bottom

DN 63: Push center spring down and dismount two-piece circlip from the center bearing. Lift off ball guide plate

DN 100 - 400: Unscrew the hexagonal nuts (19). Lift off counter plate (20) and ball guide plate (18)

Remove the locking balls (21)