Page 1
460-12, -15, & -16 Series
Fisher Controls
Instruction Manual
480 Series Actuators
(-12, -15, CL -16 Types)
(jiiiiq
September 1974 Form 5034
Type Numbers and Combinations
Type 480 Pneumatically operated piston actuator with
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 specifications.
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
Figure 1. Type 48015 Piston Actuator
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.
Page 2
480-12, -15, & -16 Series
Actuator Specifications Table
481.12:
a"d
I
20
I
3112
I
8.5
I
150
I
2.118
*n- .^
I
I 480-16.
461.16, "0" and *c
t
40 20 30 I I 4.3/4 &l/8 3-l/2 I I 28.26 16.5 8.5 150
-2oi1.13
60 I 8-l/2 55.6 4-,/E
460.16, 40 El/8
28.25 8-l/8
481-16.
and
60
8-l/2 55.5 160 El/8
466.16
80 1 c-3/4 88.6 8.1/E
'On typer with a positioner, the cylinder pressure may be approximately 10% less than the supply prwure.
Pressure 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.
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.
-
Types 480.12.480-15. and 480.16
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.
While the pmitioner and actuafor can function with a
minimum supply pressure of 35 psig, at least 50 psig is
recommended when used on any high-friction valve.
Actuator performance will improve with increased supply
pressure up to the 150 psig maximum rating of the
actuator.
[CAUTION 1
Linkage strength may limit maximum allowable
actuator supply pressure on any given
installation.
Types 481.12.481-15, 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, 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 positioner case should always be vented to prevent
The top of the cylinder is loaded directly through the
pressure buildup. !f the vent must be piped fo a remote manifold base when the solenoid valves so dictate. The
location use large diameter tubing and make as short and necessary tubing fo load the bottom of the cylinder is _
straight a run as practical. Excessive vent line pressure drop assembled at the factory.
2
Page 3
I
480-12. -15. & -16
Series
I
Figure 2. Illustration of a Type 3579 Manifold Assembly.
PNSiON
a,.,, ,,,,a- 4CTu4mR
Figure 3. Type 489 Wiring and Piping Schematic
Principle of Operation
Type
480 Combinations
(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
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.
I
4
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.
3
Page 4
480-12, -15, & -16 Series
Type 481 Combinations
Fisher Type 481 actuator combinations are the basic piston
actuators without integral cylinder loading devices. A
suitable switching device (supplied by the customer)
provides for loading the top or bottom 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.
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.
Bypass Piping
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.
Adjustments
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.
Actuator Maintenance
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
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.
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 the valve body or shut off the pressure in the
pipeline.
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. Remove all tubing lines [cylinder (key 15). instrument,
supply and exhaurtlfrom the actuator.
4. Remove positioner cover after loosening the four cover
screws on the underside of the positioner base.
5. Disengage range spring by unscrewing the spring
retainer from the piston rod extension (key 51.
6. Remove the cap screws (shown in figure 6 as key 79 on
Type 481 combinations) that hold the positioner base.
solenoid manifold, or cylinder cover (key 31, figure 61 to
the cylinder or positioner extension. Do not lose the small
O-ring (shown in figure 6 as key 78 on Type 481
combinations) used to seal the supply air passage at the top
of the cylinder.
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 (key 1) to
mounting bracket and lift off actuator assembly.
vvfa”“fact”red b” John Crane co.
4
Page 5
480-12, -15, & -16 Series
Figure 5. Type 480.15Piston Actuator-Piston Rod End
for Type 480.12 Shown in Inserr
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.
10. Unscrew both seal bushings (keys 7 and 8).
11. Inspect all parts for excessive wear and defects.
Replace all worn O-rings. Lubricate as mentioned above.
12. To reassemble. reverse the above procedure.
Figure 6. Series480.16 P;ston Actuator-Sk 80
Serial Number
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.
Parts List
KW
4
Page 6
480-12, -15, & -16 Series
Ke”
24.
25
26
27
28’
29’
30
3,
32
7E4
w
10IIYIll
Figure 7. Type 480 with Optional Bypass Assembly
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