Instruction Manual |
8560 Valve |
D102013X012 |
December 2010 |
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Fisherr 8560 Eccentric Disc
Butterfly Control Valve
Contents |
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Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. 1 |
Scope of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
1 |
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
1 |
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
2 |
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
3 |
Valve Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
5 |
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
9 |
Packing Maintenance . . . . . . . . . . . . . . . . . . . . . . . . |
12 |
Seal Ring Maintenance for NPS 3 through |
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12 Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
16 |
Seal Ring Maintenance for NPS 2 . . . . . . . . . . . . . . . |
21 |
Disc, Drive Shaft and Bearing Maintenance |
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for NPS 3 through 12 Only . . . . . . . . . . . . . . . . . |
22 |
Disc, Drive Shaft and Bearing Maintenance |
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for NPS 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
25 |
Actuator Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . |
26 |
Parts Ordering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
28 |
Retrofit Kits for ENVIRO SEALt Packing . . . . . . . . |
29 |
Repair Kits for ENVIRO SEAL Packing . . . . . . . . . . . |
29 |
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
29 |
Figure 1. Fisher 8560 Valve with 1052 Actuator and DVC6000 Series Digital Valve Controller
W8299
Introduction
Scope of Manual
This instruction manual includes installation, maintenance, and parts information for NPS 2 through 12 8560 Eccentric Disc Butterfly Control Valves (see figure 1). Refer to separate instruction manuals for information covering the actuator and accessories.
Do not install, operate, or maintain 8560 valves without being fully trained and qualified in valve, actuator, and accessory installation, operation, and maintenance. To avoid personal injury or property damage, it is important to carefully read, understand, and follow all the contents of this manual, including all safety cautions and warnings. If you have any questions about these instructions, contact your Emerson Process Management sales office before proceeding.
Description
The seal design of the 8560 eccentric disc high performance butterfly valve provides excellent shutoff capability. The valve includes PTFE filled or graphite packing rings that electrically bond the shaft to the valve body. This valve has a spline drive shaft end, and soft or metal seal rings for use in a wide variety of applications.
www.Fisher.com
8560 Valve |
Instruction Manual |
December 2010 |
D102013X012 |
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Table 1. Specifications
Valve Size and End Connection Styles
NPS J 2, J 3,ÇJ 4,ÇJ 6,ÇJ 8,ÇJ 10, and
J 12 valves and in Wafer or Single flanged style (NPS 2 available in wafer only)
Maximum Inlet Pressure(1)
Carbon Steel and Stainless Steel Valve Bodies:
Consistent with CL150 and 300 pressure/temperature ratings per ASME B16.34 unless limited by material temperature capabilities. NPS 2 is also consistent with CL600.
Maximum Pressure Drops(1)
Consistent with CL150 and 300 pressure temperature ratings per ASME B16.34 except for PTFE, UHMWPE and Phoenix III seals which are derated at some higher pressure temperature values. Refer to figure 2
Shutoff Classifications
JPTFE, Reinforced PTFE, and UHMWPE(3) Seals:
Bidirectional shutoff to Class VI per ANSI/FCI 70 2 and IEC 60534 4.
JNPS 2 Metal Seal: Bidirectional shutoff. 0.001% of maximum valve capacity (1/10) of Class IV per ANSI/FCI 70 2 and IEC 60534 4. Maximum Pressure drop is 51 bar (740 psi) forward and 6.9 bar (100 psi) reverse.
JNOVEX Seal: For NPS 3 through 12. Unidirectional shutoff is 0.0001% of maximum valve capacity (1% of Class IV) in the reverse flow direction per ANSI/FCI 70 2 and IEC 60534 4.
JPhoenix III Seal: For NPS 3 through 12. Bidirectional shutoff to Class VI per ANSI/FCI 70 2 and IEC 60534 4. For the optional
Phoenix III Fire Tested seal, consult your Emerson Process Management sales office.
Flow Characteristics
Approximately linear
Disc Rotation
Clockwise to close (when viewing from the drive shaft end) through 90 degrees of disc rotation (see figure 10)
Flow Direction
See figure 3
Actuator/Valve Action
With the diaphragm or piston actuators, the valve action is field reversible. Refer to information in the Installation section.
Valve Classification
Face to face dimensions of NPS 3 through 12 are in CL150 and 300, and meet
API 609 or MSS SP 68 standards for face to face dimensions of wafer style and single flange valves.
Shaft Diameters
See table 2
Approximate Weights
See table 2
ENVIRO SEAL Packing
This optional PTFE or graphite packing system provides excellent sealing, guiding, and transmission of loading forces to control liquid and gas emissions (see figure 8). See bulletin 59.3:41 ENVIRO SEAL Packing System for Rotary Valves for more information.
1.The pressure/temperature limits in this manual and any applicable standard or code limitation for valves should not be exceeded.
2.For components selection and applicable fire tested standards and codes, consult your Emerson Process Management sales office.
3.UHMWPE stands for ultra high molecular weight polyethylene.
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Instruction Manual |
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8560 Valve |
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D102013X012 |
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December 2010 |
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Table 2. Valve Size, Shaft Diameter, and Approximate Weight |
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SHAFT DIAMETER |
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APPROXIMATE WEIGHT |
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VALVE SIZE, |
CLASS |
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Wafer Style |
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Single Flange |
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NPS |
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mm |
Inches |
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kg |
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Pounds |
kg |
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Pounds |
2 |
150/300/600 |
12.7 |
1/2 |
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4.3 |
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9.5 |
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3 |
150 |
12.7 |
1/2 |
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4.5 |
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10 |
6.4 |
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14 |
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300 |
15.9 |
5/8 |
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5.9 |
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13 |
11 |
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25 |
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4 |
150 |
15.9 |
5/8 |
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8.6 |
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19 |
11 |
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24 |
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300 |
19.1 |
3/4 |
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10 |
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23 |
18 |
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39 |
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6 |
150 |
19.1 |
3/4 |
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13 |
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29 |
16 |
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35 |
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300 |
25.4 |
1 |
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15 |
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33 |
27 |
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59 |
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8 |
150 |
25.4 |
1 |
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21 |
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47 |
27 |
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59 |
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300 |
31.8 |
1 1/4 |
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24 |
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53 |
42 |
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93 |
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10 |
150 |
31.8 |
1 1/4 |
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34 |
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75 |
40 |
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88 |
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300 |
38.1 |
1 1/2 |
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44 |
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96 |
78 |
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172 |
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12 |
150 |
38.1 |
1 1/2 |
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49 |
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107 |
62 |
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137 |
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300 |
44.5 |
1 3/4 |
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64 |
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141 |
131 |
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288 |
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Installation
The valve is normally shipped as part of a control valve assembly, with the power actuator mounted on the valve. If the valve or actuator have been purchased separately, or if the actuator has been removed for maintenance, mount the actuator on the valve, and adjust actuator travel before inserting the valve body into the line. This is necessary due to the measurements that must be made during the actuator calibration adjustment process. Refer to the Actuator Mounting section of this manual to mount the actuator on the valve. Refer to the actuator instruction manual for mounting and adjusting instructions before proceeding.
WARNING
Always wear protective gloves, clothing, and eyewear when performing any installation operations to avoid personal injury.
To avoid personal injury or property damage resulting from the sudden release of pressure, do not install the valve assembly where service conditions could exceed the limits given in this manual, the limits on the appropriate nameplates, or the matching pipe flange rating. Use pressure relieving devices as required by government or accepted industry codes and good engineering practices.
Check with your process or safety engineer for any additional measures that must be taken to protect against process media.
If installing into an existing application, also refer to the WARNING at the beginning of the Maintenance section in this instruction manual.
WARNING
The valve configuration and construction materials are selected to meet particular pressure, temperature, pressure drop, and controlled fluid conditions. Responsibility for the safety of process media and compatibility of valve materials with process media rests solely with the purchaser and end user. Since some valve body/trim material combinations are limited in their pressure drop and temperature range capabilities, do not apply any other conditions to the valve without first contacting your Emerson Process Management sales office.
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8560 Valve |
Instruction Manual |
December 2010 |
D102013X012 |
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Table 3. Maximum Allowable Inlet Pressure for M35 1 and CW2M Valve Bodies(1)
TEMPERATURE |
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M35 1 |
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CW2M |
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150 |
300 |
600(2) |
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150 |
300 |
600(2) |
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_C |
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Bar |
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-46 to 38 |
15.8 |
41.3 |
82.7 |
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20.0 |
51.7 |
103.4 |
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93 |
13.8 |
36.5 |
72.7 |
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17.9 |
51.7 |
103.4 |
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149 |
13.1 |
34.1 |
68.2 |
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15.9 |
50.3 |
100.3 |
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204 |
12.7 |
33.1 |
65.8 |
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13.8 |
48.6 |
97.2 |
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260 |
11.7 |
32.8 |
65.5 |
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11.7 |
45.9 |
91.7 |
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_F |
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Psig |
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-50 to 100 |
230 |
600 |
1200 |
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290 |
750 |
1,500 |
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200 |
200 |
530 |
1055 |
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260 |
750 |
1,500 |
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300 |
190 |
495 |
990 |
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230 |
730 |
1,455 |
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400 |
185 |
480 |
955 |
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200 |
705 |
1,410 |
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500 |
170 |
475 |
950 |
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170 |
665 |
1,330 |
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1. M35 1 and CW2M valve material are not included in ASME B16.34 pressure/temperature ratings. The designations 150 and 300 for this valve material are used only to indicate relative pres sure/retaining capabilities and are not ASME pressure/temperature rated classes.
2. CL600 is only available in the NPS 2.
Table 4. Construction Material Temperature Limits(1)
COMPONENTS AND MATERIALS OF CONSTRUCTION |
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TEMPERATURE LIMITS |
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_C |
_F |
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Valve Body Material / Disc / Shaft Material |
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ÇÇCarbon Steel / CF8M / S17400 |
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-29 to 427 |
-20 to |
800 |
ÇÇCarbon Steel / CF8M / S20910 |
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-29 to 427 |
-20 to |
800 |
ÇÇCF8M / CF8M / S17400 |
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-73 to 427 |
-100 to 800 |
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ÇÇCF8M / CF8M / S20910 |
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-198 to 538 |
-325 to |
1000 |
ÇÇCG8M / CG8M / S20910Ç |
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-198 to 538 |
-325 to |
1000 |
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Bearing Material |
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ÇÇPEEK / PTFE lined |
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-73 to 260 |
-100 to 500 |
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ÇÇMetal (NOVEX or Phoenix III only)Ç |
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-198 to 538 |
-325 to |
1000 |
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Packing Material |
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ÇÇPTFE V Rings |
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-46 to 232 |
-50 to |
450 |
ÇÇGraphite rings (NOVEX or Phoenix III only) |
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-198 to 538 |
-325 to |
1000 |
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Seal Ring |
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ÇÇPTFE (Standard) Soft Seal Ring |
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-46 to 232 |
-50 to |
450 |
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ÇÇReinforced PTFE Soft Seal Ring |
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-46 to 232 |
-50 to |
450 |
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ÇÇUHMWPE Soft Seal Ring |
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-18 to 93 |
0 to 200 |
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ÇÇNOVEX Metal Seal Ring |
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-46 to 538 |
-50 to 1000 |
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ÇÇPhoenix III Metal Seal Ring |
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ÇÇÇÇFluorocarbon backup ring |
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-40 to 232 |
-40 to |
450 |
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ÇÇPhoenix III Fire Tested(2) Metal Seal Ring |
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ÇÇÇÇFluorocarbon backup ring |
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-40 to 232(2) |
-40 to 450(2) |
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(Specify metal bearings and graphite packing) |
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1. Refer to Ordering Matrix for 8560 Valves. For selection temperatures not shown above, contact your Emerson Process Management sales office. |
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2. For component selection and applicable fire tested standards and codes, consult your Emerson Process Management sales office. |
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1.Install a three valve bypass around the control valve assembly if continuous operation is necessary during inspection and maintenance of the valve.
2.Inspect the valve to be certain that it is free of foreign material.
CAUTION
Be certain that adjacent pipelines are free of any foreign material, such as pipe scale or welding slag, that could damage the valve sealing surfaces.
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Instruction Manual |
8560 Valve |
D102013X012 |
December 2010 |
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Figure 2. Maximum Pressure/Temperature Ratings
A6306-2
NOTE:
1 |
TEMPERATURE LIMITATIONS DO NOT ACCOUNT FOR THE ADDITIONAL LIMITATIONS IMPOSED BY THE BACKUP RING USED WITH THIS SEAL. TO DETERMINE THE EFFECTIVE |
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TEMPERATURE LIMITATION OF THE APPROPRIATE SEAL/BACKUP RING COMBINATION, REFER TO TABLE 4. |
Valve Orientation
When installing the valve, it is recommended that the valve drive shaft be horizontal as shown in figure 1.
Note
Due to its weight, the 1052 size 70 actuator must be externally supported when mounted in a horizontal position.
Valve Direction
The high performance butterfly valve is designed to allow flow in either direction when in the open position. When in the closed position, high pressure should be applied to a specific side of the disc to provide best performance and optimal valve life (see list of seal types below). See figure 3.
Applications with bi directional seals, such as soft or Phoenix III, under normal operating conditions can (at different times) experience pressure in both directions; the highest of the two pressures should be exerted on the preferred side of the disc. If the two pressures are equal, then the one lasting the longest period of time should be applied to the preferred side.
1.For PTFE, Reinforced PTFE, and UHMWPE seal rings: This seal is bidirectional. For optimal performance, high pressure should be applied to the front (retaining ring side) of the disc.
2.For metal seal rings:
a.NOVEX seal: The NOVEX seal is uni directional. High pressure at the closed position MUST be at the back (waterway side) of the disc.
b.Phoenix III Seal: This seal is bidirectional. For best performance, high pressure at the closed position should be applied to the back (waterway side) of the disc.
c.NPS 2 Seal: The preferred direction of installation is with high pressure at the front (retaining ring side) of the disc. Reverse shutoff is permissible at lower pressure (see the specifications table).
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8560 Valve |
Instruction Manual |
December 2010 |
D102013X012 |
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Figure 3. Flow Direction
RETAINER RING SIDE RETAINER RING SIDE
LABEL |
LABEL |
ARROW SHOWS PREFERRED FLOW DIRECTION FOR SOFT SEALS
FORWARD FLOW
RETAINER RING
FORWARD
FLOW
FACE SIDE OF DISC
NOTES:
1. BY EMERSON PROCESS MANAGEMENT DEFINITION:
S FORWARD FLOW IS INTO THE FACE SIDE OF THE DISC. S REVERSE FLOW IS INTO THE HUB SIDE OF THE DISC.
75B1181-A
A6882
ARROW SHOWS FLOW DIRECTION FOR NOVEX METAL SEAL, AND PREFERRED FLOW DIRECTION FOR PHOENIX METAL SEAL
REVERSE
FLOW
Table 5. Special Spiral Wound Gasket Dimensions, Inches
Valve Size, NPS |
Class |
Gasket Internal Diameter |
Gasket Outside Diameter |
Centering Outside |
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Diameter(1) |
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3 |
150 |
4.25 |
5.00 |
5.375 |
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3 |
300 |
4.25 |
5.00 |
5.875 |
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4 |
150 |
5.25 |
6.125 |
6.875 |
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4 |
300 |
5.25 |
6.125 |
7.125 |
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1. Dimension per API 601 and ASME 16.5 Flanges.
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8560 Valve |
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D102013X012 |
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December 2010 |
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Table 6. Stud Bolt and Hex Head Cap Screw Data(1) |
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WAFER STYLE |
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SINGLE FLANGE STYLE |
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VALVE |
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CL150 |
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CL300 |
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CL150 |
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CL300 |
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A |
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A |
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B |
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B |
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SIZE, |
No. of |
Size Dia |
No. of |
Size Dia |
No. of |
Size Dia |
No. of |
Size Dia |
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Dimen |
Dimen |
Dimen |
Dimen |
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NPS |
Stud |
Inch & |
Stud |
Inch & |
Cap |
Inch & |
Cap |
Inch & |
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sion, |
sion, |
sion, |
sion, |
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Bolts |
Thread |
Bolts |
Thread |
Screws |
Thread |
Screws |
Thread |
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Inch |
Inch |
Inch |
Inch |
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2(2) |
4 |
5/8 11 |
5 |
8 |
5/8 11 |
5.25 |
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3 |
4 |
5/8 11 |
5.75 |
8 |
3/4 10 |
6.5 |
8 |
5/8 11 |
1.875 |
16 |
3/4 10 |
2 |
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4 |
8 |
5/8 11 |
6 |
8 |
3/4 10 |
7 |
16 |
5/8 11 |
2 |
16 |
3/4 10 |
2.25 |
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6 |
8 |
3/4 10 |
6.5 |
12 |
3/4 10 |
7.5 |
16 |
3/4 10 |
2 |
24 |
3/4 10 |
2.5 |
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8 |
8 |
3/4 10 |
7 |
12 |
7/8 9 |
9 |
16 |
3/4 10 |
2.25 |
24 |
7/8 9 |
3 |
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10 |
12 |
7/8 9 |
8 |
16 |
1 8 |
10 |
24 |
7/8 9 |
2.5 |
32 |
1 8 |
3.5 |
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12 |
12 |
7/8 9 |
8.5 |
16 |
1 1/8 8 |
11 |
24 |
7/8 9 |
2.75 |
32 |
1 1/8 8 |
3.75 |
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1. Thread engagement in accordance with ASME B31.3.
2. The NPS 2 valve is only available in wafer style and is multirated to CL150, 300 and 600. The CL600 stud bolts require 8 bolts, have a dia. of 5/8 11, and are 6 inches long.
Figure 4. Stud Bolts and Cap Screws for Installation (also see table 6)
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A3886 |
A3887 |
STUD BOLT |
CAP SCREW |
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Installing the Valve in the Pipeline
WARNING
The edges of a rotating disc have a shearing effect that may result in personal injury. To help prevent such injury, stay clear of the disc edges when rotating the disc (key 3, figure 14).
CAUTION
Damage to the disc will occur if any pipe flanges or piping connected to the valve interfere with the disc rotation path. If the piping flange has a smaller inner diameter than what is specified for schedule 80 piping, measure carefully to be certain the disc rotates without interference before putting the valve into operation.
CAUTION
Damage to the disc (key 3) sealing surfaces may occur if the disc is not closed when the valve is being removed from the pipeline. If necessary, use a temporary pressure source on the actuator to retain the disc in the closed position while removing the valve from the pipeline.
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1.For Fail Open Actuators: It will be necessary to provide a temporary loading pressure to the actuator diaphragm to move the valve disc to the closed position. Observe the above Warning when closing the valve. If a loading pressure is required, use caution when working with the valve. If the loading pressure is disconnected, the disc will open rapidly.
2.With the disc in the closed position, install line flange gaskets, and install the valve between the pipeline flanges.
WARNING
If spiral wound gaskets are to be used with an NPS 3 or 4 CL150 or 300 single flange valve, special spiral wound gaskets conforming to the dimensions listed in the table 5 MUST be used. Improperly sized gaskets may increase the likelihood of 1) excessive seat leakage, 2) damage due to contact with valve internals, and 3) external leakage; which may result in personal injury and/or property damage due to a sudden increase or decrease of pressure within or release of pressure from the pipeline. The special dimension spiral wound gaskets can be obtained from your local spiral wound gasket vendor.
Note
The remaining single flange valve sizes (NPS 6 through 12) and all wafer style valves (NPS 2 through 12) use the standard size spiral wound gaskets. Only the single flange valves in the sizes and pressures listed in table 5 require special spiral wound gaskets.
Select the appropriate gaskets for the application. Flat sheet, spiral wound (NPS 6 through 12), or other gasket types made to ASME 16.5 group or a user's standards can be used for 8560 valves depending on the service conditions and applications.
3. Install the flange studs:
Note
Lubricate line flange studs or bolts before inserting them into flanges. If necessary, provide additional support for the control valve assembly because of its combined weight.
D Flange studs: Install two or more line flange studs into the line flanges to help hold the valve in position while centering the valve. Carefully center the valve on the flanges to ensure disc clearance.
Figure 5. Optional Shaft to Valve Body Bonding Strap Assembly
END PLATE OF ACTUATOR |
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MOUNTING YOKE |
CAP SCREW |
A |
VALVE |
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(KEY 22)
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B2434 |
VIEW A A |
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D Select and install two pipe line gaskets.
D Flange Cap Screws: If line flange cap screws are used, be certain the cap screw threads engage the tapped holes to a depth equal to the flange cap screw diameter.
4.Install the remaining line flange bolting to secure the valve in the pipeline. Tighten the nuts to the line flange studs, or cap screws, in a crisscross pattern to ensure proper alignment of valve, gaskets, and flanges.
Packing Adjustment and Shaft Bonding
WARNING
Personal injury could result from packing leakage. Valve packing was tightened before shipment; however the packing might require some readjustment to meet specific service conditions. Check with your process or safety engineer for any additional measures that must be taken to protect against process media.
CAUTION
Use caution when tightening packing follower nuts because over tightening the nuts will accelerate wear and could produce higher rotating friction loads on the valve stem.
1.For PTFE or graphite packing: tighten standard packing follower nuts only enough to prevent shaft leakage. Excessive tightening of packing will accelerate wear and could produce higher rotating friction loads on the valve stem. If necessary, refer to the Packing Maintenance section.
2.ENVIRO SEAL Packing System will not require this initial re adjustment. Refer to the separate ENVIRO SEAL Packing System for Rotary Valves instruction manual (D101643X012) for repair and replacement procedures.
3.For hazardous atmosphere or oxygen service valves, read the following Warning, and provide the bonding strap assembly mentioned below if the valve is used in an explosive atmosphere.
WARNING
The valve drive shaft is not necessarily grounded to the pipeline when installed. Personal injury or property damage could result from an explosion caused by a discharge of static electricity from the valve components if the process fluid or the atmosphere around the valve is flammable. To avoid personal injury or property damage, make sure the valve is grounded to the pipeline before placing the valve assembly into service.
Standard PTFE packing is composed of a partially conductive carbon filled PTFE female adaptor with PTFE V ring packing. Standard graphite packing is composed of all conductive graphite ribbon packing rings. Alternate shaft to valve body bonding is available for hazardous service areas where the standard packing is not sufficient to bond the shaft to the valve (see the following step).
For oxygen service applications it is necessary to provide alternate shaft to valve body bonding according to the following step.
4.Attach the bonding strap assembly (key 131, figure 5) to the shaft with the clamp (key 130, figure 5), and connect the other end of the bonding strap assembly to the valve with the cap screw (key 22, figure 5).
5.For more information, refer to the Packing Maintenance subsection below.
Maintenance
Valve parts are subject to normal wear and must be inspected and replaced as necessary. The frequency of inspection and replacement depends upon the severity of service conditions. Instructions are given in this section for replacing
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packing, seal ring, disc, shaft, bearings, and other valve parts. Also, instructions are provided for changing valve action, mounting, and adjusting the actuator. Refer to the actuator instruction manual for additional information for mounting and adjusting the actuator.
CAUTION
It is possible to damage the valve if the actuator travel stops are not properly adjusted before stroking the valve.
WARNING
Avoid personal injury or property damage from sudden release of process pressure or bursting of parts. Before performing any maintenance operations:
D Do not remove the actuator from the valve while the valve is still pressurized.
D Always wear protective gloves, clothing, and eyewear when performing any maintenance operations to avoid personal injury.
D Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the actuator cannot suddenly open or close the valve.
D Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure from both sides of the valve. Drain the process media from both sides of the valve.
D Vent the pneumatic actuator loading pressure and relieve any actuator spring precompression.
D Use lock out procedures to be sure that the above measures stay in effect while you work on the equipment.
D The valve packing box may contain process fluids that are pressurized, even when the valve has been removed from the pipeline. Process fluids may spray out under pressure when removing the packing hardware or packing rings, or when loosening the packing box pipe plug.
D The edges of a rotating disc have a shearing effect that may result in personal injury. To help prevent such injury, stay clear of the disc edges when rotating the disc (key 3).
D Check with your process or safety engineer for any additional measures that must be taken to protect against process media.
CAUTION
During any of the following steps, do not rotate the disc past 90 degrees in the open direction. Rotating the disc past 90 degrees can damage the seal ring.
Stopping Leakage
For PTFE filled or graphite standard packing arrangements covered in this manual, often leakage from the packing can be stopped by tightening the packing flange nuts just enough to stop the leak.
CAUTION
Use caution when tightening the nuts because over tightening the nuts can damage packing box parts.
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D If tightening the packing flange nuts does not stop the leakage, use the following procedures to remove the control valve assembly from the pipeline. Remove the actuator when removing and replacing packing parts.
D If the leakage comes from the outside diameter of the packing box, it is possible that the leakage is caused by nicks or scratches on the packing box wall. Carefully inspect the packing box bore and valve drive shaft when the packing is removed. Use the following steps to remove the actuator and to remove and replace the packing parts.
Removing the Actuator
1.Isolate the control valve from the line pressure, release pressure from both sides of the valve body, and drain the process media from both sides of the valve. If using a power actuator, also shut off all pressure lines to the power actuator, and release all pressure from the actuator. Use lock out procedures to be sure that the above measures stay in effect while you work on the equipment.
CAUTION
Damage to the disc (key 3) sealing surfaces may occur if the disc is not closed when the valve is being removed from the pipeline. If necessary to overcome spring force, use a temporary pressure source on the actuator to close the disc. Also, maintain the pressure to retain the disc in the closed position while removing the valve from the pipeline.
2. Be sure the disc is in the closed position before attempting to remove the valve from the pipeline or flanges.
WARNING
The edges of a rotating disc close with a shearing effect that may result in personal injury. To help prevent such injury, stay clear of the disc edges when rotating the disc (key 3).
For Fail Open Actuators: It will be necessary to provide a temporary loading pressure to the actuator diaphragm to move the valve disc to the closed position. Observe the above Warning when closing the valve. If a loading pressure is required, use caution when working with the valve. If the loading pressure is disconnected, the disc will open rapidly.
Figure 6. Lever Shaft Orientation
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ACTUATOR ROD |
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TURN BUCKLE |
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ACTUATOR ROD END BEARING |
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ACTUATOR LEVER |
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LEVER INDEX MARKS (4) |
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ACTUATOR |
VALVE SHAFT INDEX MARK |
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LOCKING |
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CAP SCREW |
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TYPICAL ACTUATOR |
SECTIONAL THROUGH |
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(1052) |
HOUSING |
C0784
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