GE mn-28000_series Service Manual download pdf (Page 3)

Masoneilan VariPak Adjustable Cv Control Valves Instruction Manual | 3

Contents

1. General ......................................................................................................4

1.1 Spare Parts ............................................................................................4

1.2 After Sales Department ................................................................................4

1.3 Training ................................................................................................4

2. Operation ...................................................................................................5

2.1 Precise Adjustment of the Varipak 28002 Adjustable-C

Valve ............................................5

2.2 Flow Coefficient of Varipak 28001 Single-Lever and 28002 Adjustable-C

Valves ..........................5

2.3 Actuator ...............................................................................................7

2.4 Handwheel ............................................................................................7

2.5 Reversing the Valve Action ..............................................................................8

3. Installation .................................................................................................10

3.1 Preliminary Steps ......................................................................................10

3.2 Valve Installation ......................................................................................10

3.3 Pneumatic and Electrical Circuit .......................................................................11

3.4 Limit Switches .........................................................................................11

4. Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

4.1 Piston Rod Clevis Adjustment ..........................................................................12

4.2 Plug Stem Adjustment .................................................................................12

4.3 Limit Stop Adjustment .................................................................................13

4.4 Varipak 28002 C

Adjustment ..........................................................................14

4.5 Positioner Start-Up Pressure Adjustment ...............................................................14

5. Maintenance ...............................................................................................14

5.1 Actuator Diaphragm Removal .........................................................................14

5.2 Adding Packing Ring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

5.3 Disassembly ..........................................................................................15

5.4 Reassembly ...........................................................................................16

5.5 Packing Quick Change Method (Only For Valves With Max. C

Of 0.6 To 3.8) ..............................18

5.6 7700P or 7700E Positioner Maintenance ................................................................18

5.7 Maintenance Operations Specific to the 7700E Positioner ...............................................19

5.8 Converting a 7700P Positioner (Pneumatic) into a 7700E Positioner (Electro-Pneumatic) ..................20

1 2 3 4 5 6 7 8 ... 24 25

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GE mn-28000_series Service Manual Page 3

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