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-15, & -16 Series


480 Series Actuators (-12, -15, CL-16 Types)






Form 5034

and Combinations

Type 480 Pneumatically operated piston integral Type 3570 or 3570C valve positioner.



Type 481 Pneumatically or hydraulically operated piston actuator without positioner for on-off service. Tapped cylinder cover provided for loading upper side of piston. External switching valve must be provided. Type 489 Hydraulically operated piston actuator with a Type 3579 solenoid manifold in place of positioner. Loading pressure is supplied and exhausted by electrically operated solenoid valves. Travel is proportional to duration of electrical impulse. -12 Construction Size 20 piston actuator assembled with universal mounting flange and integral clevis stem connector. For mounting on Design U Spec 6 valves. .15 Construction Size 20, 30, 40. or 60 piston actuator assembled with universal mounting flange. A Type 480-15 is shown in figure 1. -16 Construction - 8” stroke size 40. 60 or 80 piston actuator assembled with universal mounting flange. The table below lists actuator


1. Type 48015

Piston Actuator


Installation Inspect this equipment on arrival to note any damage which may have occurred in transit. If the actuator is attached to a valve body when received, install the valve in the pipeline with flow in the direction of the arrow on the body. Some butterfly valves can be installed with flow in either direction and are not marked as to proper flow direction. If Fisher piston actuators are used to operate equipment other than Fisher equipment, a suitable mounting plate and

appropriate linkage connection between the piston rod of the actuator and connecting arm of the equipment must be provided. The size 20 actuators have four 318”-16 UNC tapped holes on a 2.718” bolt circle in the cylinder flange (key 1, figures 5 and 6) for mounting. Sizes 30,40. and 60 actuators have four holes tapped l/2”-13 UNC on a 3-718” bolt circle in the cylinder flange. The cylinder flange of the size 80 Series 480.16 has four mounting holes tapped 314”-10 UNC on a 5112” bolt circle.



& -16




a"d 481.12: *n- .^


460.16, 481-16. and 466.16 'On





461.16, "0"and *c

40 30 20


&l/8 4.3/4 3-l/2











Connections NOW

Supply pressure air or gas should be clean and dry, as well as non-corrosive. Use of a Fisher Type 254 filter is recommended.

Types 480.12.480-15.

and 480.16

While the pmitioner and minimum supply pressure recommended when used Actuator performance will pressure up to the 150 actuator.

actuafor can function with a of 35 psig, at least 50 psig is on any high-friction valve. improve with increased supply psig maximum rating of the

4-,/E 8-l/8 160

88.6 10% less than the supply

Linkage strength actuator supply installation.


limit maximum pressure on

The positioner case should always pressure buildup. !f the vent must location use large diameter tubing straight a run as practical. Excessive


1 allowable any given

be vented to prevent be piped fo a remote and make as short and vent line pressure drop

El/8 8.1/E


can adversely affect the operation of the positioner. If the valve is installed with the actuator below the pipeline, provide a new vent location in the lowest part of the case by removing the 114” NPT cadmium plated pipe plug and installing a 318” NPT pipe plug into the standard vent hole. The vent also serves as a drain to prevent accumulation of condensate.


and 481.16

The Type 481 actuator combinations have a cylinder cover (key 31. figure 61 with a 114” NPT tapping for loading on top of the piston. A 114” NPT tapping near the cylinder/cylinder flange joint is for supplying pressure to the bottom of the piston. An external switching device must be provided to direct supply pressure to one side or the other of the piston while exhausting the opposite side.

Types 489-12.489-15,




Types 481.12.481-15,

A Type 3570 or 3570C positioner is an integral part of Type 480 combinations. Two l/4” NPT connections on the positoner labeled “Supply” and “Instrument” remain to be made after valve installaion.

2.118 I

28.26 16.5 8.5


1 c-3/4 may be approximately

150 I


80 the cylinder

with a positioner,





I 480-16. t


and 489.16

The Type 489 combinations, utilizing a Type 3579 solenoid manifold (see figure 2) instead of a positioner, require 114” NPT supply pressure piping. The exhaust port is also tapped 114” NPT for piping back to the hydraulic reservoir. The conduit connections are tapped l/2” NPT. Refer to figures 2 and 3 for wiring requirements. The top manifold necessary assembled

of the cylinder base when the tubing fo load at the factory.

is loaded directly through solenoid valves so dictate. the bottom of the cylinder

the The is


I 480-12.

-15. & -16 Series


expands and moves the beam, which pivots around the fixed point and simultaneously uncovers the nozzle of relay “0” and covers the nozzle of relay “A”. Relay “A” nozzle pressure increases due to the restriction created by the beam over the nozzle. Through relay action. the air pressure to the top of the piston increases. Relay “6” reacts to the change in beam position to decrease the pressure on the underside of the piston. Due to the unbalanced pressures acting on the piston, it moves down, changing the position of the valve disc, louver, etc., to the desired position. A feedback arrangement consisting of a range spring between the beam and the piston rod extension prevents over-correction and ensures a definite position of the piston for a given instrument signal. thus giving stable and accurate response to a change in controlled conditions.

Figure 2. Illustration

of a Type 3579 Manifold







Figure 3. Type 489 Wiring and Piping Schematic

Principle of Operation Type 480


(See figure 41 The pneumatic pressure signal from the instrument or controller is piped to the bellows of the positioner. Assume that the positioner is direct-acting and that the instrument signal has increased. The bellows

Upon receiving a decreasing instrument signal. the reverse of the above action takes place. The bellows contracts and the beam pivots, restricting the nozzle of relay “6” and uncovering the nozzle of relay “A”. Through relay action, the pressure below the actuator piston increases and the pressure above the piston decreases to move the piston upward.



Type 481 Combinations Fisher Type 481 actuator combinations actuators without integral cylinder suitable switching device (supplied provides for loading the top or bottom

are the basic piston loading devices. A by the customer) of the cylinder.

Type 489 Combinations The Type 3579 solenoid manifold acts to alternately load and exhaust opposite sides of the piston in response to electrical signals from an outside power source. Since the solenoid valves are the normally closed type. they lock the hydraulic fluid in the piston actuator when the circuit is opened. Thus the actuator can be positioned at any point in the stroke by opening an external switch at the appropriate time.


If the valve or louver operated by the piston actuator can also be operated manually, the optional bypass assembly (figure 7) may be required. Opening the hand valve (key 121, figure 7) allows the operating fluid to flow freely between the top and bottom of the cylinder. Closing the hand valve will allow pneumatic or hydraulic operation to continue.

All adjustments on the Type 480 actuator combinations are on the Type 3570 or 3570C positioner. For further information on the positioner, such as Adjustment, Maintenance. Reversing, and Relay Operation, refer to the Type 3570 Instruction Manual. The Type 481 and 489 combinations require no adjustments. If direct current operation is desired, consult the Fisher representative in your area.



It is necessary for efficient and proper operation of the actuator that all parts be free from dirt, abrasives, and foreign materials. Upon assembly at the factory, all synthetic rubber O-rings have been coated with Lubriplate


b” John Crane co.


To disassemble a Fisher piston actuator, proceed as follows: (References to “positioner” can be ignored on types not utilizing positioners.) Key numbers noted refer to figures 5 and 6 unless specifically identified. I. Bypass pipeline.




or shut




in the

The adjustable linkage between the actuator and the main valve should not be disconnected when the valve is open with fluid flowing or under pressure. (Dampers or louvers should be in safe, stable positions prior to disconnection.)

2. Shut off all pressure lines to the positioner or solenoid manifold, and lock out the electrical power to the hydraulic pump and solenoid manifold if appropriate. 3. supply

Remove and

all tubing exhaurtlfrom

4. Remove positioner screws on the underside 5. Disengage retainer from


& -16

130.AA, a special lubricant manufactured and distributed by Fiske Brothers Refining Company of Newark, New Jersey and Toledo, Ohio. It is recommended that this lubricant or an equivalent be used on all O-rings, especially those on moving parts or in contact with moving parts, whenever the actuator is dismantled. Also apply Pipe Lead Seal No. 2* or equivalent to the top of the piston rod where it is tapered and seals with the piston.

When an external switch is moved to the “DOWN” position. solenoid valves #I and #4 open as shown in the figure 3 schematic. Hydraulic fluid flows through solenoid #4 to load the top of the cylinder while fluid below the piston flows back to the oil sump through solenoid #I. Operation continues in this manner until the circuit is broken. When switched to the “UP” position. solenoid valve #5 opens to load the bottom of the cylinder and solenoid valve #2 opens to exhaust the top of the cylinder.




lines the






cover after loosening the of the positioner base.

range spring by unscrewing piston rod extension (key 51.

6. Remove the cap screws (shown in Type 481 combinations) that hold solenoid manifold, or cylinder cover the cylinder or positioner extension. O-ring (shown in figure 6 as key combinations) used to seal the supply of the cylinder.





figure 6 as key 79 on the positioner base. (key 31, figure 61 to Do not lose the small 78 on Type 481 air passage at the top

7. Next remove the clevis bolt (key 32. figure 5 if -12 construction) from the adjustable linkage. Remove the bottom snap ring (key 26, figure 5 if -15 construction) and unscrew the clevis and boot locknut (key 181 from the actuator piston rod (key 4). 8. Remove cap screw that hold cylinder flange mounting bracket and lift off actuator assembly.


1) to



Figure 5. Type 480.15Piston for Type 480.12

Actuator-Piston Shown in Inserr


& -16


Rod End

9. Remove the cap screws (key 131 that hold the cylinder to the cylinder flange. Two slots, 180�apart. are located at the lower edge of the cylinder. Insert a screwdriver in these slots and pry the cylinder loose. The piston (key 3) and piston rod will come out with the cylinder. The piston can then be removed by pulling it out the open end of the cylinder.

Figure 6. Series480.16 10.




11. Inspect all parts Replace all worn O-rings. 12.







7 and

for excessive wear Lubricate as mentioned


the above


8). and

Serial defects. above.

P;ston Actuator-Sk



When corresponding with the sales representative about this equipment. state the serial number of the unit. When ordering replacement parts. also specify the complete eleven-character part number of each part required.




-15, & -16 Series

w 10IIYIll Ke” 24. 25 26 27

28’ 29’ 30 3, 32 7E4

Figure 7. Type 480 with Optional

Bypass Assembly

480~12~15~16 Actuator Instruction Manual  

Fisher Controls instruction manual, courtesy of RMC Process Controls & Filtration, Inc. & Repair kits, orifices, dis...

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