PROCEED HPA 3 Manual de Instruções descarregar pdf (Página 19)

Instruction Manual

D101634X012

HP and HPA Valves

October 2014

Figure 9. Typical Balanced TSO Trim, Large Port Designs (2.6875 Inch and Larger Port Diameters)

VALVE PLUG

SEAL

PROTECTED

SOFT SEAT

A7096

Table 10. Actuator Groups by Type Number

Group 1

71 & 90 mm (2-13/16 & 3-9/16 Inch) Yoke Boss

Group 100

127 mm (5-Inch) Yoke Boss

472 & 473

585C

644 & 645

655

657 & 667

685SE & 685SR

1008

472

473

474

476

585C

657

Group 101

127 mm (5-Inch) Yoke Boss

667

4. Attach a handle, such as a piece of strap iron secured by stem locknuts, to the valve stem. Rotate the handle

alternately in each direction to lap the seats.

5. After lapping, disassemble as necessary (you may mark the position of the seat ring and cage with a soft tip

marker). Clean the seating surfaces, replace the gaskets, reassemble (taking care to return the seat ring and cage to

their original positions), and test for shutoff. Repeat the lapping procedure if necessary.

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PROCEED HPA 3 Manual de Instruções Página 19