Emerson A31A Manual de instrucciones descargar pdf (Pagina 9)

Cryogenic-Rotary Valve

Instruction Manual

Form 5482

February 2005

3. Remove the retaining ring by placing a socket

head retaining ring screw from the retaining ring in

each of the two retaining ring jacking screw holes.

Slowly turn the screws until the retaining ring has

been lifted from the valve body. Remove the

retaining ring to expose the seal ring in the T-slot

area of the valve body.

Note

The Type A31A Cryogenic valve is

available with different seal designs

and components. See figure 4 to

identify the specific seal design.

CAUTION

To avoid possible leakage, be careful

not to damage the gasket sealing

surface, the seal ring, or the T-slot

area in the valve body while

performing the next two steps.

4. Remove and discard the retaining ring gasket

(key 16). Be careful to not scratch the gasket seating

surface.

5. Insert a regular screw driver or other similar tool

under the top edge of the seal ring (key 7), and

gently pry it out of the T-slot area in the valve body.

Take care not to damage the seal ring or T-slot area

of the valve body. After the seal ring has been

removed, clean the T-slot area, retaining ring, and, if

required, polish the disc thoroughly with fine steel

wool or other appropriate material.

NOVEXt Seal Installation

Unless otherwise indicated, key numbers and part

names are listed in figures 7 and 8. Seal installation

is shown in figure 5.

A maintenance kit with installation tools is available

through your Fisher sales office.

1. Locate the replacement seal ring (key 7) and note

the shape of the ring. The ring is wider across one

edge diameter and narrower across the other edge

diameter. Also, note the wide groove around the

outside circumference.

Before installing the seal ring into the valve body,

place the backup ring, if applicable, (key 8) into the

wide, outer groove of the seal ring.

Figure 4. Available Seal Configurations

KEL‐F / ALUM SEAL

16B5083 / DOC

BODY

GRAPHITE

GASKET

RETAINING

RING

SEAL

RING

VALVE DISC

HIGH PRESSURE

AT SHUTOFF

BODY

GRAPHITE

GASKET

RETAINING

RING

SEAL

RING

VALVE DISC

HIGH PRESSURE

AT SHUTOFF

BODY

GRAPHITE

GASKET

RETAINING

RING

SEAL

RING

VALVE DISC

HIGH PRESSURE

AT SHUTOFF

NOVEX SEAL

KEL‐F SEAL

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 23 24

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Emerson A31A Manual de instrucciones Pagina 9

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