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Installation, Operating, and Maintenance Instructions Series 02 VAT Vakuumventile AG, CH-9469 Haag , Switzerland Tel ++41 81 771 61 61 Fax ++41 81 771 4 8 30 Email reception@vat.ch http://www.vat.ch M02001EB 2003 - 04 - …

Installation, Operating, and Maintenance Instructions

Series 02

VAT Vakuumventile AG, CH-9469 Haag, Switzerland

Tel ++41 81 771 61 61 Fax ++41 81 771 48 30 Email reception@vat.ch http://www.vat.ch

M02001EB

2003-04-14

4/13

Operation

Normal operation

Valve with pneumatic actuator : Valve is opened and closed pneumatically.

Admissible temperature

See chapter «Technical data».

Compressed air failure

Valve closed: Valve remains closed (mechanically locked).

Valve open: Valve position is undefined.

Power failure

Valve supplied with pneumatic connection (ordering code 020 . . - . . 24) :

Valve position depends on applied solenoid valve. VAT recommends to operate all transfer valves with impulse actuated

solenoids.

Valve supplied with impulse solenoid (ordering code 020 . . - . . 44) :

Valve closed: Valve remains closed (mechanically locked).

Valve open: Valve remains open.

A started movement will be completed.

Emergency operation at power failure

In case of power failure, valve can be actuated if compressed air is available.

To actuate valve in case of power failure :

Press push-button : Valve opens

Pull push-button : Valve closes

Installation, Operating, and Maintenance Instructions

Series 02

VAT Vakuumventile AG, CH-9469 Haag, Switzerland

Tel ++41 81 771 61 61 Fax ++41 81 771 48 30 Email reception@vat.ch http://www.vat.ch

M02001EB

2003-04-14

5/13

Preventive Maintenance

The italicized numbers refer to the detail drawings in this chapter and to

the drawings in chapter «Spare parts».

Under clean operating conditions, the valve does not

require any maintenance during the specified cycle life

(see chapter «Technical data»).

Preventive maintenance actions include replacing gate,

bellows, and piston seals. Also, the pneumatic parts are

relubricated, and the valve body is cleaned. Other parts

are checked and replaced if necessary. For repair or case

of emergency, VAT recommends to keep at least the

following spare parts on site :

1 MONOVAT gate

2 bellows assembly

1 complete gate/actuator assembly (minimizes MTTR)

Cleaning or Replacing Gate

1. Vent chambers and open valve

2. Disconnect valve from compressed air and electrical supply

3. Unfasten bonnet screws 65 and remove gate/actuator assembly carefully

4. Loosen screws 44 by 1 turn to withdraw gate from shafts

5. Clean or replace gate, reassemble in reverse direction. Tighten gate screws 44 with 5 Nm.

Replacing Bellows

1. Remove gate as described above

2. Remove cover sheets 15 (2x) with screws 47 (4x per sheet)

3. Remove circlip 53, washers 51 (2x), distance rings 23 (2x), and bolt 11 (see

detail)

4. Unfasten screws 40 (8x) and remove bonnet 64

5. Pull out bellows assembly 2 carefully

Note : Do not contaminate O-rings 30 and tube 17 with any dirt or lubricant.

6. Mount new bellows assembly 2, O-rings 30 (2x per bellows) and tube 17

(1x per bellows)

Note : Handle new bellows assembly with gloves.

7. Reassemble in reverse direction

Please note :

Do not contaminate the vacuum side of the bellows with any lubricant.

The shaft of replacement bellows assembly is lubricated at the factory for the shaft bushing.

Actuator has a leak detection port (marked on drawing) for the bellows assembly.

Installation, Operating, and Maintenance Instructions

Series 02

VAT Vakuumventile AG, CH-9469 Haag, Switzerland

Tel ++41 81 771 61 61 Fax ++41 81 771 48 30 Email reception@vat.ch http://www.vat.ch

M02001EB

2003-04-14

6/13

Replacing Piston seals:

1. Remove gate and cover sheets as described above

2. Unfasten screws 40 (8x) and remove bonnet 64

3. Remove nut 55 and lug 22, and pull out piston 14 and shaft 13

4. Replace piston O-ring 32 and shaft seal 33, replace static O-rings 31, 35, 36 if damaged

5. Lubricate cylinder and piston with VAT high temperature pneumatic grease

6. Reassemble in reverse direction

Replacing Position indicator

1. Disconnect valve from compressed air and electrical supply

2. Remove cover sheets 15 (2x) with screws 47 (4x per sheet)

3. Unfasten screws 76 (4x), wire wrap and screws (2x per switch) of micro switch

75, remove plug with wires and switches (see detail)

4. Reassemble in reverse direction

The switch point can be readjusted by loosening the screws of the switch and

moving the switch in the slotted holes of the mounting bar. The switch point should

be set 1 to 1.5 mm prior to the end positions.

Adjustment of Actuator

The compression of the gate seal is adjusted and tested at our factory and must normally not be readjusted.

Verification of Adjustment

Gap «A» between gate and seat (see sketch beside) should be 3.0 mm ±0.15 mm

Gate and seat should be parallel within 0.2 mm

During closing the mechanical locking should occur between 1.3 and 2 bar air pressure

To check this : 1. Reduce air pressure below 1 bar

2. Command valve in closed position

3. Increase air pressure until a clicking sound indicates the mechanical locking

Adjustment of Compression and / or Parallelism

1. Open valve

2. Loosen screws 43 (2x per rack) of racks 12 (2x)

3. Adjust compression of gate seal by turning both screws 42 by the same angle

Note : Turning screws 42 by 30° results in 0.125 mm change of compression.

4. Adjust parallelism by turning one screw 42

Note : Turning one screw 42 by 30° results in 0.125 mm change of compression on the respective side

5. Fasten screws 43 (4x)

6. Open and close valve, verify again compression and parallelism, repeat adjustment if necessary