Note
Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use and maintenance of any product. Responsibility for the selection, use, and maintenance of any product remains with the purchaser and end-user.

• Actuator Versatility—Actuator with or without positioners and snubbers are available in an assortment of sizes, stroking speeds, thrusts, and travels to handle most control requirements.
• Compact Design—Yokeless construction permits a low-profile assembly by allowing close coupling to the control device; either through a bracket or, with some versions, by direct mounting on a bonnet flange.
• Wide Range Supply Pressure Capability—The cylinder (and 3570 Series positioner if used) can operate with supply pressures as low as 2.4 bar (35 psig) or as high as 10.3 bar (150 psig).
• Long Stroke—Actuators have maximum rated travels of up to 206 mm (8.125 inches).
• Positioner Versatility—Positioner/actuator action is easily reversed in the field with no additional parts. Positioner sensitivity, travel span, and travel starting point are factory set and need to be reset only if operating conditions have changed or if the positioner has been reversed. See figure 2.

Available Configurations

See the Actuator Configurations section.

Cylinder Pressure

Maximum Allowable: (4) 10.3 bar (150 psig)
Required to Produce a Given Thrust: See figure 3.
Minimum Recommended: Valves with low torque requirements - (2.4 bar [35 psig]); all other valves - (3.4 bar [50 psig])

Maximum Supply Source Consumption

With Positioner and Constant Input Signal: 0.54 normal m3/hr(1) (20 scfh(1)) of air at 6.9 bar (100 psig)
Types Without Positioner: Depends on cylinder volume and supply pressure.

Travel Information

Maximum Rated Travels, All Types with Linear Output: See table 1.
Travel Stops Available for Types with 105 mm (4.125 inch ) Maximum Rated Travels: See table 1

Thrust Information

See figure 3

Torque Output

Types 480, 480-15, and 480-16 (for butterfly valves): Contact your Emerson Process ManagementTM sales office

Stroking Speeds

See table 1

Operative Ambient Temperature(2)

With Nitrile O-Rings: -34 to 79°C (-30 to 175°F)
With Fluorocarbon O-Rings (Optional): (3) -18 to 149°C (0 to 300°F)

Actuator Size and Piston Size

See table 1

Pressure Connections

Standard is 1/4 NPT. For larger sizes, contact your Emerson Process Management sales office.

Construction Materials

Actuator:

Linkage Connections and Mounting Information

See figures 8, 9, 10, and 11

Options

■376 Series trip valve system to fail actuator
■up or ■down or ■lock in last position
■Type 304 electrical valve stem position switch
■Micro-Switch limit switches

Available Configurations

Type 3570: Valve positioner with two relays and three pressure gauges for monitoring input signal and output pressures to the top and underside of the actuator piston
Type 3570C: Similar to Type 3570 except that the positioner is equipped with automotive tire valves instead of pressure gauges. The valves can be used for clip-on test pressures gauges. The relay nozzles on these positioners are locked in place with locknuts to resist unwanted nozzle movement due to vibration

Input Signal

Standard Ranges: 0.2 to 1.0 bar (3 to 15 psig) or 0.4 to 2.0 bar (6 to 30 psig)
Split Ranges: Typically uses one half of standard range when two control valves are operated by one input signal from a single controller.
Optional Ranges: As required within the limits of the bellows

Bellows Pressure Rating

Standard Bellows: 3.4 bar (50 psig)
Optional Bellows: 6.2 bar (90 psig)

Supply Pressure

Maximum: 10.3 bar (150 psig)
Minimum: 2.4 bar (35 psig)

Output Signal

Type: Pneumatic pressure as required by the actuator
Action: Field reversible between direct and reverse (see table 2)

Hysteresis(1,2)

0.15% of total stroke or instrument pressure span

Resolution(1,2)

0.2% of instrument pressure span

Repeatability(1,2)

0.3% of instrument pressure span

Frequency Response(1,2)

See figure 4

Pressure Connections

Vent: 3/8 NPT
All Others: 1/4 NPT

Pressure Indications

Type 3570C: Tire valves accept standard pressure gauge chucks
Type 3570: See table below

Static Air Consumption(3)

0.56 normal m3/hr (20 scfh) with 6.9 bar (100 psig) supply pressure

Operative Ambient Temperature(1,2)

With Nitrile O-Rings: -34 to 79°C (-30 to 175°F)
With Fluorocarbon O-Rings (Optional): (3) -18 to 149°C (0 to 300°F)

Construction Materials

Actuator:

Options

Type SS-52 clip-on chuck (with or without gauge) for Type 3570C positioners

Actuator

These actuators react to a pressure unbalance that is created by loading supply pressure on one side of the piston and unloading the opposite side. Some type of switching device is required to shift the supply pressure from one side of the piston to the other. For most types in the 480 Series, this device is a 3570 Series positioner. However, a separate loading device must be provided for actuators without positioners.
For actuators with positioners (figure 5), the pneumatic output signal from a controller or instrument is piped to the positioner bellows. As long as the bellows receives a constant input signal pressure, the beam remains motionless and allows
supply pressure to bleed through both relay nozzles such that a constant pressure is maintained between the nozzle and the fixed orifice. The relays are in equilibrium with their inlet and exhaust valves closed.
Assume that a downward piston motion is required and the bellows receives a corresponding change in input signal pressure. This causes the beam to pivot so that it covers the nozzle on relay A. (Beam movement is accomplished either by increasing the input signal pressure on a direct-acting positioner to expand the bellows, or by decreasing the input signal pressure on a reverse-acting positioner to contract the bellows.)
The nozzle pressure in relay A increases due to the restriction created by the beam over the nozzle. Through relay action, the air pressure to the top of the piston is increased. At the same time, relay B reacts to the change in beam position to decrease the pressure to the underside of the piston. Due to the resulting unbalanced forces acting on the piston, it moves down, changing the valve plug position.
Piston movement is fed back to the beam by means of a range spring which is connected to the beam and to the piston rod extension, applying a force to the beam opposite to that caused by the expanding or contracting bellows. This feedback arrangement prevents overcorrection and ensures a definite position of the piston and valve plug for a given instrument signal.
If upward piston motion is required, the beam pivots over the nozzle on relay B. The result is relay, piston, and feedback action opposite that for downward piston motion.
Reversal of positioner action is accomplished simply by removing four screws, inverting the bellows, and installing two bellows posts for support it the change is from direct to reverse action. Bellows posts are stored in the positioner case and are not used if the change is from reverse to direct.

Actuator with Snubber

As the actuator piston strokes, the snubber piston moves inside an oil-filled cylinder, forcing oil from one side of the piston to the other through two check valves (see figure 6). The resistance to flow created by the settings of the check valves and the shock absorbing quality of the oil combine to damp out any tendency of the valve plug to jump. The plug of each check valve is held off its seat by the positioning of the adjusting screws. Thus, with the adjusting screws backed off all the way, maximum damping will be obtained.

Note
Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use and maintenance of any product. Responsibility for the selection, use, and maintenance of any product remains with the purchaser and end-user.