Emerson Fisher YD & YS Manuál s instrukcemi stáhnout pdf (Strana 6)

Instruction Manual

D100425X012

YD and YS Valves

October 2014

Packing Maintenance

Note

For valves with ENVIRO-SEAL packing, see the Fisher instruction manual ENVIRO-SEAL Packing System for Sliding-Stem Valves for

packing instructions.

For valves with HIGH-SEAL packing, see the Fisher instruction manual HIGH-SEAL Live-Loaded Packing System for packing

instructions.

Packing Replacement

WARNING

Observe the warning at the start of the Maintenance section.

Table 3. Recommended Torque for Packing Flange Nuts

VALVE STEM

DIAMETER

PRESSURE

RATING

GRAPHITE TYPE PACKING PTFE TYPE PACKING

Minimum Torque Maximum Torque Minimum Torque Maximum Torque

mm Inches NSm LbfSin NSm LbfSin NSm LbfSin NSm LbfSin

9.5 3/8

CL125,

150

3 27 5 40 1 13 2 19

CL250,

300

4 36 6 53 2 17 3 26

CL600 6 49 8 73 3 23 4 35

12.7 1/2

CL125,

150

5 44 8 66 2 21 4 31

CL250,

300

7 59 10 88 3 28 5 42

CL600 9 81 14 122 4 39 7 58

19.1 3/4

CL125,

150

11 99 17 149 5 47 8 70

CL250,

300

15 133 23 199 7 64 11 95

CL600 21 182 31 274 10 87 15 131

25.4 1

CL300 26 226 38 339 12 108 18 162

CL600 35 310 53 466 17 149 25 223

31.8 1-1/4

CL300 36 318 54 477 17 152 26 228

CL600 49 437 74 655 24 209 36 314

The following procedure covers PTFE V-ring packing. A similar procedure can be followed for PTFE/composition

packing. However, because PTFE/composition packing comes in split rings, it is possible to replace the rings without

removing the actuator from the valve.

Installation of graphite ribbon/filament packing requires special care to avoid trapping air between the rings. Start only

oneringatatimewithoutforcingthetopofthepackingringbelowthebottomoftheentrancechamferofthe

packing box. Thus, when a ring is added, the stack should not be pushed into the cavity more than the thickness of the

added ring.

The arrangement of packing box parts is shown in figures 3, 4, 5, 6, and 7. Key numbers used in the following steps are

showninfigures13and14.

1 2 3 4 5 6 7 8 9 10 11 ... 31 32

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