Instruction Manual |
667 Size 80 and 100 Actuators |
D100311X012 |
May 2011 |
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Fisherr 667 Diaphragm Actuators
Size 80 and 100
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Figure 1. Size 80 Fisher 667 Actuator |
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Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. 1 |
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Scope of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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Maximum Pressure Limitations . . . . . . . . . . . . . . . . . |
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Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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Actuator Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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Loading Connection . . . . . . . . . . . . . . . . . . . . . . . . . . |
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Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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Size 80 Actuator Spring . . . . . . . . . . . . . . . . . . . . . . . |
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Travel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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Spring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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Size 100 Actuator Spring . . . . . . . . . . . . . . . . . . |
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Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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Size 80 Actuator Maintenance . . . . . . . . . . . . . . . . . . |
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Size 100 Actuator Maintenance . . . . . . . . . . . . . . . |
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For Actuators without the |
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Top Loaded Option . . . . . . . . . . . . . . . . . . . |
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For Actuators with the |
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Top Loaded Option . . . . . . . . . . . . . . . . . . . |
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Size 80 Side Mounted Handwheel . . . . . . . . . . . . . |
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Size 80 Hydraulic Snubber . . . . . . . . . . . . . . . . . . . . |
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Size 100 Top Mounted Handwheel |
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(Adjustable Down Travel Stop) . . . . . . . . . . . . . . |
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Parts Ordering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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Parts Kits |
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Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
23 |
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Introduction
Scope of Manual
This instruction manual provides information on installation, adjustment, maintenance, and parts ordering for the Fisher 667 actuator in sizes 80 and 100 (figure 1). Refer to separate instruction manuals for information about other equipment and accessories used with these actuators.
www.Fisher.com
667 Size 80 and 100 Actuators |
Instruction Manual |
May 2011 |
D100311X012 |
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Do not install, operate, or maintain 667 actuators 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.
Table 1. Specifications
SPECIFICATION |
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ACTUATOR SIZE |
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80 |
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100 |
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Nominal Effective Diaphragm Area |
cm2 |
1761 |
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2902 |
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inch2 |
273 |
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450 |
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Yoke Boss Diameters |
mm |
127 |
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127 |
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178 |
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inch |
5 |
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5H(1) |
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7 |
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Acceptable Valve Stem Diameters |
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25.4 or 31.8 |
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31.8 |
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50.8 |
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inch |
1 or 1 1/4 |
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1 1/4 |
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Standard Cast Iron |
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All Steel |
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Maximum Allowable Output Thrust |
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Construction |
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Construction |
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N |
62942 |
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88075 |
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200170 |
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lb |
14150 |
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19800 |
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45000 |
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Maximum Travel |
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76 |
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102 |
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inch |
3 |
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4 |
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Material Temperature Capabilities |
_C |
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-40 to 82 |
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_F |
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-40 to 180 |
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Pressure Connections |
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1/4 NPT internal |
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Approximate Weights Without Handwheel |
kg |
284 |
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544 |
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lb |
626 |
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1200 |
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1. Heavy actuator to bonnet bolting.
Description
The 667 actuator is a reverse acting actuator. Reverse acting actuators use air action to lift the diaphragm (away from the valve), and spring action opposes the diaphragm action (see figure 2). The actuator position changes in response to varying controlled air pressure to the diaphragm. If air pressure is reduced or lost from the actuator diaphragm, spring action will extend the actuator stem. The actuator is often used with control valves using a pneumatic positioner for air pressure control, and where fail action will fully open or close the control valve as the actuator stem extends.
Also, the actuator can be furnished with either a side mounted (size 80 only) handwheel assembly or a top mounted handwheel (adjustable up travel stop) (size 100 only). The size 80 side mounted handwheel is normally used as an auxiliary manual actuator. The size 100 top mounted handwheel is used as either a travel stop or an auxiliary manual actuator.
The actuator can be furnished with a top loading capability. A top loaded actuator allows air pressure to be applied to the top of the diaphragm, aiding the spring to extend the actuator stem. This air pressure increases valve seat load on valve applications where additional seat loading is necessary.
Specifications
Refer to table 1 for Specifications of the 667 actuator. See the actuator nameplate for information about a specific actuator.
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Instruction Manual |
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667 Size 80 and 100 Actuators |
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D100311X012 |
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May 2011 |
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Figure 2. Schematic Representation of Fisher 667 Actuator |
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DIAPHRAGM |
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AIR |
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SPRING |
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PUSHES |
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LIFTS |
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DOWN |
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ACTUATOR |
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STEM |
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AF3833 A |
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A6127 |
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667 REVERSE ACTING DIAPHRAGM ACTUATOR |
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Table 2. Maximum Pressure Limitations |
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ACTUATOR SIZE |
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PRESSURE LIMITATIONS |
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80 |
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100 |
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Standard Cast Iron Construction |
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All Steel Construction |
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Maximum Casing |
bar |
3.4 |
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4.9 |
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6.9 |
Pressure for Actuator |
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psig |
50 |
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70 |
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100 |
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Sizing |
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Maximum Excess |
bar |
1.4 |
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1.4 |
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1.7 |
Diaphragm Pressure |
psig |
20 |
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20 |
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25 |
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Maximum Diaphragm Casing |
Upper bench set plus Maximum |
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Upper bench set plus Maximum |
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Upper bench set plus Maximum |
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Excess Diaphragm Pressure or 4.1 bar |
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Excess Diaphragm Pressure or 5.5 bar |
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Excess Diaphragm Pressure or 7.9 bar |
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Pressure |
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(60 psig), whichever is less. |
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(80 psig), whichever is less. |
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(115 psig), whichever is less. |
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Maximum Pressure Limitations
WARNING
To avoid personal injury or parts damage, do not exceed the Maximum Pressures listed in table 2. Exceeding any of the maximum pressures can result in uncontrolled movement of parts, damage to actuator parts and the control valve, and loss of control of the process. Use pressure limiting or pressure relieving devices to prevent casing pressure from exceeding these limits.
The casing and diaphragm of 667 actuators are pressure operated. This air pressure provides force to compress the spring and stroke the actuator. The following explanations describe the maximum pressure limits for 667 actuators. Refer to the nameplate, warning tag, and table 2 for maximum values.
D Maximum Casing Pressure for Actuator Sizing: This is the maximum pressure that can be applied to provide full travel of the actuator. If this stroking pressure is exceeded before the upper diaphragm plate contacts the travel stop, damage to the stem or other parts might result. The Maximum Diaphragm Casing Pressure for a specific actuator construction may be less than the Maximum Casing Pressure for Actuator Sizing. See table 2.
D Maximum Excess Diaphragm Pressure: This is the additional pressure that may be added when the actuator is at full travel. If the Maximum Excess Diaphragm Pressure is exceeded once the actuator has reached full travel, damage to the diaphragm or diaphragm casing might result.
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667 Size 80 and 100 Actuators |
Instruction Manual |
May 2011 |
D100311X012 |
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Because the actuator has traveled its specified travel, and the diaphragm head is physically stopped from movement, the force from any additional air pressure is transmitted to the diaphragm and diaphragm casings. The amount of air pressure that can be added once the actuator has traveled to the stops is limited by the resultant adverse effects that may occur. Exceeding this limiting factor could result in leakage or casing fatigue due to the deformation of the upper diaphragm casing.
D Maximum Diaphragm Casing Pressure: If the Maximum Diaphragm Casing Pressure is exceeded, damage to the diaphragm, diaphragm casing, or actuator might result. For some actuator constructions, the maximum Diaphragm Casing Pressure is the sum of the upper bench set, noted on the nameplate, added to the Maximum Excess Diaphragm Pressure. For other actuator sizes, the value is lower, see table 2.
WARNING
To avoid personal injury or parts damage, do not exceed the Maximum Diaphragm Casing Pressure listed in table 2. The Maximum Diaphragm Casing Pressure must not produce a force on the actuator stem greater than the maximum allowable actuator output thrust or the maximum allowable stem load.
Installation
WARNING
Always wear protective gloves, clothing, and eyewear when performing any installation operations to avoid personal injury.
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.
When an actuator and valve are shipped together, the actuator is normally mounted on the valve. Follow the valve instructions when installing the control valve in the pipeline. If the actuator is shipped separately or if it is necessary to mount the actuator on the valve, perform the following Actuator Mounting procedures.
For information on mounting valve positioners, refer to the appropriate valve positioner instruction manual.
Actuator Mounting
1.Mount the actuator on the valve bonnet. Insert the cap screws and tighten the hex nuts, securing the actuator to the bonnet.
2.Screw the valve stem jam nuts (key 69, figures 6 and 7) all the way onto the valve stem threads.
3.Connect an air supply to the lower diaphragm casing connection.
4.For push down to close valves, be sure the valve plug is on its seat. Reduce loading pressure to ensure that the actuator stem is fully extended. Apply slight loading pressure to retract the stem approximately 3.2 mm (1/8 inch).
5.For push down to open valves, apply pressure to ensure that the actuator stem is fully retracted. Be sure the valve plug is on its seat. On large valve sizes, this may require the use of a pry bar inserted through the valve body line
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Instruction Manual |
667 Size 80 and 100 Actuators |
D100311X012 |
May 2011 |
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opening. If the valve is installed in a pipeline, the bottom flange (if one is used) can be removed and the valve plug pushed to the seat from the bottom opening. Reduce actuator loading pressure to extend the stem approximately 3.2 mm (1/8 inch).
CAUTION
Incomplete engagement of either the valve stem or actuator stem in the stem connector can result in stripped threads or improper operation. Be sure that the length of each stem clamped in the stem connector is equal to or greater than the diameter of that stem.
6.Clamp the actuator and valve plug stems between the two stem connector halves (key 31, figures 6 and 7). Insert and tighten the stem connector cap screws.
7.Thread the stem locknuts against the stem connector.
8.Align the travel indicator scale (key 32, figures 6 and 7) to show valve position.
WARNING
To avoid personal injury due to the sudden, uncontrolled movement of parts, do not loosen the cap screws when the stem connector has spring or loading pressure force applied to it.
Loading Connection
Key number locations are shown in figures 6 and 7, unless otherwise directed.
1.Connect the loading pressure piping to the connection in the size 80 spring case adaptor (key 89) or in the size 100 lower diaphragm casing (key 67).
For top loaded actuators
1.For size 80, remove the the pipe bushing (key 78), and connect the loading pressure piping in its place. For size 100, remove the hex bushing (key 62) from the upper casing (key 1), and connect the top loading pressure piping in its place.
2.Remove the 1/4 inch bushing (key 92, figure 6; key 62, figure 7) to increase connection size, if necessary. The connection can be made with either piping or tubing.
3.Keep the length of tubing or piping as short as possible to avoid transmission lag in the control signal. If an accessory (such as a volume booster or valve positioner) is used, be sure that the accessory is properly connected to the actuator. Refer to the positioner instruction manual as necessary.
4.Cycle the actuator several times to check that the valve stem travel is correct and that the travel occurs when the correct pressure range is applied to the diaphragm.
5.If valve stem travel is incorrect, refer to the Travel procedure in the Adjustments section.
6.If the spring pressure range is incorrect, refer to the Spring procedure in the Adjustments section.
Adjustments
Travel
Make travel adjustments when the motion observed during actuator travel is different from the travel stamped on the actuator nameplate. If the Actuator Mounting procedure was followed correctly, this adjustment should not be necessary.
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667 Size 80 and 100 Actuators |
Instruction Manual |
May 2011 |
D100311X012 |
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When adjusting travel of a direct acting valve, put a slight pressure on the actuator diaphragm. This moves the valve plug off the seat, reducing the chance of damaging the valve plug or seat during adjustments.
1.Back the stem jam nuts (key 69, figures 6 and 7) away from the stem connector (key 31, figures 6 and 7), and slightly loosen the stem connector cap screws.
CAUTION
Do not use wrenches or other tools directly on the valve stem. Damage to the stem surface and subsequent damage to the valve packing may result.
2.Tighten the locknuts together, using a wrench, then screw the valve stem either into the stem connector to lengthen travel or out of the stem connector to shorten travel.
3.Cycle the actuator to check for the specified travel. If actual travel is not equal to the specified travel, adjust and check travel until correct. Tighten the stem connector cap screws when correct travel is obtained.
4.Raise the travel indicator disk by threading the stem locknuts against the stem connector.
Spring
Make spring adjustments when the loading pressure range applied to achieve specified travel is not equal to the pressure range stamped on the actuator nameplate. Refer to the Bench Set pressure range on the nameplate when the valve contains no pressure and the packing is loosely inserted in the bonnet. Refer to the Maximum Allowable Supply pressure on the nameplate when the valve is controlling the specified pressure drop, and the packing is tightened to stop leaks around the stem.
Monitor loading pressure carefully when making adjustments. Do not exceed the pressure specifications of either the loading regulator or the actuator casings.
Each actuator spring has a fixed pressure span. Changing the spring compression shifts the span up or down to make valve travel coincide with the loading pressure range.
Size 80 Actuator Spring
Note
Before turning the spring adjuster on size 80 actuators, assemble the stem connector around the actuator stem and the anti rotating lug on the yoke. Mark the actuator stem as a visual reference to verify that stem rotation does not occur. Remove the stem connector before rechecking the bench set.
Remove the cover band (key 87, figure 6), insert a rod of approximately 12.7 mm (1/2 inch) diameter into a hole in the spring adjustor (key 74, figure 6), and rotate the spring adjustor with the rod. Rotating the adjustor from left to right will increase the loading pressure required to start actuator stem travel; opposite rotation will decrease the pressure required to start travel.
Size 100 Actuator Spring
CAUTION
The actuator must be in the vertical position when adjusting the spring to avoid damage to the thrust bearing (key 86, figure 7) and to properly position the spacers required for adjustment.
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Instruction Manual |
667 Size 80 and 100 Actuators |
D100311X012 |
May 2011 |
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Remove the shroud plate (key 65, figure 7), and loosen the jam nut (key 26, figure 7).
For small spring forces, adjustments can be made by rotating the adjusting nut (key 25, figure 7). Counterclockwise rotation (when viewed from the diaphragm casings) of the adjusting nut will increase the loading pressure required to start actuator stem travel, and clockwise rotation will decrease the pressure required to start travel. Tighten the jam nut when adjustment is complete.
For high spring forces, it is necessary to use spacers between the bottom of the yoke and the spring seat to isolate spring force from the adjusting nut.
WARNING
To avoid personal injury from the compressed actuator spring snapping back to its original length, make and use the spacers by following the instructions in the steps below.
1.It is recommended that three spacers be made of three inch schedule 80 pipe cut to the appropriate length specified in step 2. If other than the recommended material is to be used, be certain that the spacers are capable of withstanding the spring force involved. The spacers must also be of equal length with ends cut squarely.
2.Measure dimension B as shown in figure 3. Cut the length of the spacers as follows:
a.If it is desired to decrease spring compression, make the spacers approximately 4.8 mm (3/16 inch) longer than dimension B.
b.If it is desired to increase spring compression, make the spacers approximately 4.8 mm (3/16 inch) shorter than either dimension B plus the amount of adjustment required or dimension B plus valve travel, whichever is less.
3.Whenever the total amount of adjustment required is greater than valve travel, the adjustment must be made in two or more steps, and the amount of adjustment taken in each step must be less than valve travel.
4.Pressure the actuator to attain full travel. Cautiously insert the spacers at equal intervals around the spring seat (key 19, figure 7). Spacers must be seated squarely, or they may slip out of position. Keeping hands and tools away from the spring and spring seat, slowly decrease loading pressure until the spring force holds the spacers firmly between the spring seat and the bottom of the yoke.
5.Loosen the jam nut. The adjusting nut can now be rotated counterclockwise (when viewed from the diaphragm casings) to increase the loading pressure required to start actuator stem travel or clockwise to decrease the pressure required to start travel.
6.Pressure the actuator to move the spring seat away from the spacers, and carefully remove the spacers.
7.Slowly reduce the air pressure to the actuator. Make sure that the thrust bearing (key 86) is correctly seated in the spring seat before contact with the adjustment nut (key 25) is made.
8.If the total adjustment required was greater than valve travel, repeat the procedure. It will be necessary to make new spacers using the new dimension B and the remaining adjustment required or valve travel, whichever is less. Tighten the jam nut when adjustment is complete.
Maintenance
WARNING
Avoid personal injury or property damage from sudden release of process pressure or bursting of parts. Before performing any maintenance operations:
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667 Size 80 and 100 Actuators |
Instruction Manual |
May 2011 |
D100311X012 |
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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 power 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 Check with your process or safety engineer for any additional measures that must be taken to protect against process media.
Figure 3. Dimension B for Spring Adjustment
SPRING SEAT
B
ADJUSTING NUT
JAM NUT
50A2627 C
A1007 1
Size 80 Actuator Maintenance
For size 80 actuators, refer to figure 4 for part names and locations. Key number locations for size 80 actuators are shown in figure 6.
Disassembly
1.Isolate the control valve from the line pressure, release pressure from both sides of the valve, and drain the process media from both sides of the valve. Shut off all pressure lines to the power actuator, release all pressure from the
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Instruction Manual |
667 Size 80 and 100 Actuators |
D100311X012 |
May 2011 |
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actuator. Use lock out procedures to be sure that the above measures stay in effect while you work on the equipment.
2.Remove the tubing or piping from the connection in the top of the spring case adaptor (key 89).
3.If the actuator has a handwheel, rotate the handwheel to relieve all spring compression.
4.Remove the cover band (key 87). Insert a steel rod of approximately 12.7 mm (1/2 inch) diameter into a hole in the spring adjustor (key 74), and rotate the spring adjustor from right to left until spring compression is relieved.
WARNING
To avoid personal injury due to the sudden, uncontrolled movement of parts, do not loosen the cap screws on the stem connector (key 31) when spring force is applied.
5.If necessary, the entire actuator assembly may be removed from the valve by unscrewing the cap screws from the stem connector (key 31) and removing actuator to bonnet bolting.
6.Unscrew the diaphragm casing cap screws and nuts (keys 13 and 14), and lift off the upper diaphragm casing (key 1).
7.Unscrew the diaphragm cap screw (key 12), remove the spacer, upper diaphragm plate, diaphragm, and lower diaphragm plate (keys 2, 4, 3, and 71).
Note
Standard and top loaded constructions use the same key numbers for parts. The parts look different, but they use the same assembly and disassembly sequence. See figure 4, Size 80 Actuator Construction for location of parts.
8.Unscrew the cap screws (key 30), and remove the lower diaphragm casing (key 64).
9.For actuators without a snubber:
a.Unscrew the spring case adaptor cap screws and nuts (keys 90 and 91), and remove the adaptor (key 89) from the actuator.
b.Remove the snap ring and seal bushings (keys 72 and 7). Inspect, and if necessary, obtain a replacement seal bushing (key 7). Replace the seal bushing O rings (keys 8 and 9) as required. Lubricate with lithium grease (key 237) lubricant.
c.Remove the actuator spring (key 18). Unscrew the cap screws from the stem connector (key 31), and remove the stem connector. Remove the stem (key 144) and attached spring adjustor, thrust bearing, and spring seat (keys 74, 86, and 19).
10.For actuators with a snubber (see figure 8):
WARNING
To avoid personal injury due to the sudden, uncontrolled movement of parts, ensure the actuator spring is not under compression before removing the travel stop.
a.Remove the travel stop (key 84). Be certain there is not compression in the actuator spring (key 18). If the actuator was removed from the valve, secure the stem connector (key 31) to the actuator stem (key 144) to prevent the stem from turning while unscrewing the stem and piston assembly (key 23).
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