PROCEED HPA 3 Manual de Instruções descarregar pdf (Página 28)

Instruction Manual

D101634X012

HP and HPA Valves

October 2014

Figure 15. Example of Machining the Lower (Valve Plug to Seat Ring) and Upper (C-seal Plug Seal to Cage) Seating

Surfaces

UPPER SEATING

SURFACE

C-seal

RETAINER

MACHINING OF THE UPPER

SEATING SURFACE MUST

EQUALTHETOTALMACHININGOF

THE LOWER SEATING SURFACE

(PLUG PLUS SEAT RING).IF NOT,THE

RETAINER MAY STRIKE THE UPPER

SEATING SURFACE BEFORE THE

VALVE PLUG PROPERLY SEATS ON

THE LOWER SEATING SURFACE.

LOWER SEATING SURFACE

PLUS

REMOVAL OF 0.010 INCH FROM THE SEAT RING

MUST EQUAL

4.THESEVALUESAREFOR EXAMPLEONLY.REMOVE ONLY THE MINI

MUM AMOUNT OF MATERIAL REQUIRED TO REFURBISH THE SEATS.

SEAT

RING

PLUG

CAGE

A6781 /IL

NOTE:

0.508 (0.020)

(4)

0.254 (0.010)

(4)

0.254 (0.010)

(4)

REMOVAL OF 0.254 mm (0.010 inch) FROM THE VALVE PLUG

REMOVAL OF 0.254 mm (0.010 inch) FROM THE SEAT RING

REMOVAL OF0.508 mm (0.020 inch) FROM THE UPPER

SEATING SURFACE IN THE CAGE

mm (inch)

Trim Replacement (C-seal Constru ctions)

1. Apply a suitable high-temperature lubricant to the inside diameter of the C-seal plugseal.Also,lubricatethe

outside diameter of the valve plug where the C-seal plug seal must be pressed into the proper sealing position

(figure 10).

2. Orient the C-seal plug seal for correct sealing action based on the process fluid flow direction through the valve.

D The open interior of the C-seal plug seal must face up in a valve with flow-up construction (figure 10).

D The open interior of the C-seal plug seal must face down in a valve with flow-down construction (figure 10).

Note

An installation tool must be used to properly position the C-seal plug seal on the valve plug. A tool is available as a Fisher spare part

or a tool could be manufactured following the dimensions given in figure 11.

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 55 56

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