Emerson Fisher YD & YS Manuál s instrukcemi stáhnout pdf (Strana 11)

Instruction Manual

D100425X012

YD and YS Valves

October 2014

Figure 7. Double Graphite Ribbon/Filament Arrangements for Use in Fisher ENVIRO-SEAL Bellows Seal Bonnets

BUSHING(KEY13)

SPACER (KEY 8)

GRAPHITE FILAMENT PACKING RING (KEY 7)

GRAPHITE RIBBON PACKING RING (KEY 7)

12B6102-A

18A0909-D

12B4181-A

12.7 mm

(1/2-INCH)

STEM FOR

NPS 2 VALVES

9.5 mm

(3/8-INCH)

STEM

12.7 mm

(1/2-INCH)

STEM FOR

NPS 3 AND 4 VAL VES

NOTE:

0.102 mm (0.004 INCH) THICK SACRIFICIAL ZINC WASHERS;

USE ONLY ONE BELOW EACH GRAPHITE R IBBON RING.

A5870

Take proper care not to damage any sealing or seating surfaces as nicks or scratches in these parts might cause

leakage.

5. Loosen the packing flange nuts (key 5, figures 13 and 14) and draw the valve plug and stem straight out the bottom

of the bonnet. Lift all cage and seat parts off the valve plug and stem. If the stem for YD or YS requires replacing,

drivethepin(key6)outandunscrewthestemfromtheplug.

Table 4. Pin Drill Sizes

VALVE TYPE VALVE STEM CONNECTION, mm (INCH) DRILL SIZE, INCHES

YD & YS

9.5 (3/8)

12.7 (1/2)

3/32

1/8

19.1 (3/4)

25.4 (1)

3/16

1/4

Table 5. Recommended Bolt Torques for B7 Body-to-Bonnet Bolting

(1)

VALVE SIZE,

NPS

RECOMMENDED BOLT

TORQUE, NSm(LbfSft)

1/2, 3/4

1, 1-1/2

129 (95)

2-1/2

96 (71)

169 (125)

271 (200)

549 (405)

(2)

CL150/300: 373 (275)

CL600: 522 (385)

1. For other materials, contact your Emerson Process Management sales office.

2. For NPS 8 YD valves, the bottom adaptor has shorter bolts than the bonnet, but the bolt torque is the same as the bonnet torque.

6. To replace the adaptor (key 24, figure 15) on ENVIRO-SEAL bellows seal bonnets, place the plug stem assembly and

valve plug in a soft-jaw chuck or other type of vise so that the jaws grip a portion of the valve plug that is not a

seating surface. Drive out the pin (key 36, figure 15). Reverse the plug stem assembly in the soft-jaw chuck or vise.

Grip the flat areas on the valve stem just below the threads for the actuator/stem connection. Unscrew the valve

plug/adaptor assembly (key 24, figure 15) from the valve stem assembly (key 20, figure 15).

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