Emerson 1051 User Manual

Instruction Manual

D100320X012

1051 and 1052 H & J Actuators

Fisherr 1051 and 1052 Style H and J Sizes 40, 60 and 70 Rotary Actuators

October 2012

Contents

Introduction 1.................................

Scope of Manual 1.............................

Description 2.................................

Specifications 3...............................

Educational Services 3.........................

Principle of Operation 4........................

Installation 4..................................

Actuator Mounting 5..........................

Loading Connections 12........................

Adjustment 13.................................

1051 and 1052 Turnbuckle Adjustment 13........

1052 Spring Adjustment 14.....................

Initial Compression 14......................

Stroking Range 15.........................

Maintenance 15................................

Disassembly 16...............................

Assembly 18..................................

Changing Actuator Mounting 22..................

Changing Styles 22............................

Changing Positions 23.........................

Top-Mounted Handwheels and

Adjustable Travel Stops 25.......................

Handwheel and Travel Stop Operations 25........

Handwheel and Travel Stop Maintenance 26.......

For Top-Mounted Handwheels and Adjustable

Up Travel Stops 27..........................

For Adjustable Down Travel Stops 27.............

Figure 1. Fisher 1051 Actuator with H Mounting Adaptation and 3610J Positioner

W4252

Parts Ordering 28...............................

Parts List 28...................................

Introduction

Scope of Manual

This manual provides installation, adjustment, operation, maintenance, and parts ordering information for Fisher 1051 (sizes 40 and 60) and 1052 (sizes 40, 60, and 70) diaphragm rotary actuators with H and J mounting adaptations (see figures 1 and 2). Also, this instruction manual provides information for the optional top-mounted handwheel, and both the optional up and down travel stops. Instructions for the control valve body, the positioner, accessories, and other sizes or constructions of this actuator are covered in separate manuals.

www.Fisher.com

1051 and 1052 H & J Actuators

October 2012

Table 1. Fisher 1051 and 1052 Actuator Specifications

Instruction Manual

D100320X012

Operation

Direct Acting: Increasing loading pressure extends the diaphragm rod out of the spring barrel

Service:

1051: For on-off or throttling service with positioner 1052: For on-off or throttling service with or without a

positioner

Actuator Sizes

1051: 40, and 60 1052: 40, 60, and 70

Maximum Diaphragm Sizing Pressure

(2)(3)

Size 40: 4.5bar(65psig) Size 60: 2.8bar(40psig) Size 70: 3.8bar(55psig)

Maximum Diaphragm Casing Pressure

(2)(3)

Size 40: 5.2bar(75psig) Size 60:3.4bar(50psig) Size 70: 4.5bar(65psig)

Maximum Valve Shaft Rotation

90, 75, or 60 deg with optional stops

Stroking Time

Dependent on actuator size, rotation, spring rate, initial spring compression, and supply pressure. If stroking time is critical, consult your Emerson Process Management sales office

Material Temperature Capabilities

Nitrile Diaphragm or O-Rings

(3)

(1)

: -40 to 82_C

(-40 to 180_F)

Silicone Diaphragm: -40 to 149_C(-40to300_F)

Travel Indication

Graduated disc and pointer combination located on actuator end of valve shaft

Pressure Connections

1/4 NPT internal

Mounting Positions

Seefigure10

Approximate Weights

See table 8

Torque Limits (mm)

(4)

Limited by maximum diaphragm sizing pressure or tables 2 and 3, whichever is less

1. Nitrile O-ringsare used in optional top-mounted handwheel,adjustable down travel stop, and adjustable up travel stop assemblies.

2. Use this value to determine the maximum torque output allowed.

3. The pressure / temperature limits in this manual and any applicable standard or code limitation for valve should not be exceeded.

4. Exceeding any torque requirements could damage the actuator and impair safe operation.

Additional Specifications

For casing pressure ranges and for material identification of the parts, see the Parts List

Do not install, operate, or maintain a 1051 or 1052 actuator 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

1051 and 1052 diaphragm rotary actuators are pneumatic spring-return actuators for use with rotary-control valves and other equipment. The 1051 actuator can be used for on-off service, or it can be used for throttling service when equipped with a valve positioner. The 1052 actuator can be used for on-off service, or it can be used for throttling service when equipped with or without a valve positioner. The 1052 actuator spring is adjustable.

The H mounting adaptation permits the actuator to be used with equipment other than Fisher valve bodies. The mounting brackets and couplings for rotary actuation are user-provided. This mounting adaptation includes a flat-surface mounting plate that is drilled and tapped for attaching the user-provided bracket. Cap screws for attaching the bracket are provided. H mounting also includes an output shaft (with milled flats) to provide the Double D rotary output either directly or through a user-provided coupling. Output shaft diameters and torque limits are listed in table

2. Dimensional information for the mounting plate and output shaft are shown in figures 4, 5, and 6.

Instruction Manual

D100320X012

Figure 2. Fisher 1052 Actuator with J Mounting Adaptation

W4139-1

1051 and 1052 H & J Actuators

October 2012

The J mounting adaptation permits the actuator to be used for rotary actuation of Fisher keyed-shaft butterfly valve bodies and other keyed-shaft equipment. This mounting adaptation uses the standard butterfly valve mounting bracket and provides an output shaft with an attached coupling for keyed equipment shafts. Coupling sizes and torque limits are listed in table 3. Dimensional information for the mounting bracket and stub shaft coupling i s shown in figures4,5,and7.

Additionally, a top-mounted handwheel can be applied for infrequent service as a manual handwheel actuator. For more frequent manual operation, a side-mounted handwheel actuator is available. Also, an adjustable up travel stop can be added to limit the actuator stroke in the upward direction, or an adjustable down travel stop can be added to limit actuator stroke in the downward direction.

Specifications

Specifications are shown in table 1 for 1051 and 1052 actuators. Specifications for a given 1051 or 1052 actuator as it originally comes from the factory are stamped on a nameplate attached to the actuator.

Educational S ervices

For information on available courses for 1051 and 1052 Style H and J actuators, as well as a variety of other products, contact:

Emerson Process Management Educational Services, Registration P.O. Box 190; 301 S. 1 Marshalltown, IA 50158-2823 Phone: 800-338-8158 or Phone: 641-754-3771 FAX: 641-754-3431 e-mail: education@emerson.com

Ave.

1051 and 1052 H & J Actuators

October 2012

Table 2. Output Shaft Diameters and Torque Limits for Actuators With H Mounting

ACTUATOR SIZE

(1)

1. 1052 actuator only.

OUTPUT SHAFT DIAMETER TORQUE LIMIT FOR H MOUNTING

mm Inches NDm Inch-Pounds

22.2

28.6

38.1

28.6

38.1

38.1 1-1/2 1210 10,680

7/8 1-1/8 1-1/2

1-1/8 1-1/2

240 468

1110

468

1210

Table 3. Acceptable Shaft Diameters and Torque Limits for Actuators With J Mounting

ACTUATOR SIZE

(1)

1. 1052 actuator only.

2. Coupling suppliedfor mating with either 44.5 or 50.8 mm (1-3/4 or 2-inch) keyed shaft.

COUPLING AVAILABILITY BY KEYED SHAFT DIAMETER TORQUE LIMIT FOR J MOUNTING

mm Inches NDm Inch-Pounds

9.5

12.7

15.9

19.1

25.4

19.1

25.4

31.8

38.1

50.8

31.8

38.1

50.8

3/8 1/2 5/8 3/4

3/4

1 1-1/4 1-1/2

2 1-1/4

1-1/2

(2)

69 114 207 468

207 468

1030 1360 2650

Instruction Manual

D100320X012

2120 4140 9815

4140

10,680

460

610 1010 1830 4140

1830 4140 9110

12,000 23,430

9110

12,000 23,430

Principle of Operation

The diaphragm rod moves down as loading pressure is increased on top of the diaphragm. As the loading pressure is decreased, the spring forces the diaphragm rod upward.

The spring and diaphragm have been selected to meet the requirements of the application and, in service, the actuator should produce full travel of the valve or other operated equipment with the diaphragm pressure as indicated on the nameplate.

Consult the separate positioner instruction manual for actuator principle of operation with positioner.

Installation

WARNING

Always wear protective gloves, clothing, and eyewear when performing any maintenance operations to avoid personal injury.

To avoid personal injury or property damage caused by bursting of pressure retaining parts, be certain the service conditions do not exceed the limits given in table 1. Use pressure limiting or pressure relieving devices to prevent the diaphragm sizing pressure from exceeding the maximum allowable diaphragm sizing pressure.

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.

Instruction Manual

D100320X012

1051 and 1052 H & J Actuators

October 2012

WARNING

To avoid personal injury or parts damage, do not use an operating pressure that exceeds the Maximum Diaphragm Casing Pressure (table 1) or produces a torque greater than the Maximum Allowable Valve Shaft Torque (see Catalog 14). Use pressure-limiting or pressure-relieving devices to prevent the diaphragm casing pressure from exceeding its limit.

Figure 3. Top Mounted Handwheel

ACTUATOR SIZE

40 281 11.06 356 14.00

60 359 14.12 432 17.00

(1)

1. Size 70 available in 1052 only.

JC(DIA)

TOP-MOUNTED HANDWHEEL

19A1465-B

mm Inch mm Inch

335 13.62 356 14.00

1/4 NPT

Actuator Mounting

Usethefollowingstepstoconnecttheactuatortoavalvebody or other equipment. Unless otherwise specified, key numbers are shown in figures 12 and 13. Mounting dimensions are shown in figures 4, 5, 6, and 7.

Note

For an actuator with an H mounting adaptation and a 22.2 through 38.1 mm (7/8 through 1-1/2 inch) output shaft, find dimensions and center of gravity information in figures 3, 4, 5, 6, and 9, and approximate weights in table 8. This information is required for proper fabrication of the user-provided bracket and coupling.

1. For an actuator with an Hmountingadaptation, attach an appropriate mounting bracket (not provided) to the mounting plate (key 22) with the cap screws (key 78). See figures 4, 5, and 6 for mounting dimensions on the mounting plate. Tighten the cap screws to the bolt torques listed in table 4.

2. Consult figure 10 for available mounting styles and positions. The actuator is normally positioned vertically with the valve body or other equipment in a horizontal pipeline.

1051 and 1052 H & J Actuators

October 2012

Instruction Manual

D100320X012

Note

If the milled flats or the coupling on the end of the actuator output shaft (key 87) are oriented such that the output shaft cannot accommodate the operated equipment shaft, refer to the Changing Positions portion of the Changing Actuator Mounting section. This procedure describes how the output shaft can be repositioned to accommodate the operated equipment shaft.

3. If using an actuator with a Jmountingadaptation, note that the valve shaft coupling (key 90) is furnished with two keyways lettered A and B as shown in figure 8 and 12 (letters C and D on the coupling are not used and can be disregarded). Align the appropriate keyway with the keyway in the operated equipment shaft. If using a Fisher butterfly valve, align the appropriate keyway on the coupling with the valve shaft keyway indicated in table 9. Then install the woodruff key (key 91) in the shaft keyseat, and slide the coupling onto the shaft. It is helpful to apply a light coat of grease to the inside of the coupling before sliding it onto the shaft.

4. For an actuator with an Hmountingadaptation, slide the actuator (with the user-provided mounting bracket attached) into the user-provided coupling on the operated shaft. Then, secure the actuator to the operated equipment in the desired mounting position with the appropriate fasteners, such as mounting cap screws. See figures 4, 5 and 6 for output shaft dimensions.

5. For an actuator with a Jmountingadaptation, secure the mounting bracket (key 22) to the valve body with the cap screws (key 78, not shown). Tighten the cap screws to the bolt torques in table 4. For 31.8 and 38.1 mm (1-1/4 and 1-1/2 inch) valve shafts, also place the two spacers (key 92, not shown) between the mounting bracket and valve body during this step.

6. For an actuator with a Jmountingadaptation and a 50.8 mm (2-inch) output shaft (key 87, figure 14), note that t he valve shaft coupling (key 90, figure 14) is furnished with two keyways lettered A and B as shown in figure 8 (letters C and D on the coupling are not used and can be disregarded). Align the appropriate keyway with the keyway in the operated equipment shaft. Then, install the woodruff key (key 91, not shown in figure 14) in the shaft keyseat, and slide the coupling onto the shaft using the appropriate coupling keyway (see table 9 and figure 8). It is helpful to apply a light coat of grease to the inside of the coupling before sliding it onto the shaft. Secure the actuator (user-provided mounting bracket) to the operated equipment in the desired mounting position with the appropriate fasteners, such as mounting cap screws.

7. Follow the instructions given in the Turnbuckle Adjustment section before proceeding to the Loading Connection portion of this section.

Table 4. Key 78 Cap Screw Torque Values

STYLE H MOUNTING

Actuator Size

40 22.2 7/8 5/16 22.6 16.7 1C5958X0042

40 28.6 1-1/8 3/8 39 29 1A353124052

60 28.6 1-1/8 3/8 39 29 1A353124052

40 38.1 1-1/2 1/2 92 68 1A582324052

60, 70 38.1 1-1/2 1/2 92 68 1A582324052

60, 70 44.5 1-3/4 1/2 92 68 1A582324052

60, 70 50.8 2 1/2 92 68 1A582324052

40 9.5 3/8 3/8 39 29 1A341824052

40 12.7 1/2 3/8 39 29 1A341824052

40 15.9 5/8 3/8 39 29 1A341824052

40 19.1 3/4 3/8 39 29 1A341824052

60 19.1 3/4 3/8 39 29 1A341824052

40 25.4 1 3/8 39 29 1A341824052

60 25.4 1 3/8 39 29 1A341824052

60, 70 31.8 1-1/4 5/8 163 120 1P1477X0012

60, 70 38.1 1-1/2 5/8 163 120 1P1477X0012

Valve Shaft Diameter Bolt Size Bolt Torque

mm Inch Inch N•m lbf•ft

STYLE J MOUNTING - FLAT PLATE MOUNTING

STYLE J MOUNTING - FISHER 7600, 9100, 9500 WITH KEYED SHAFT

Key 78

Part Number

Instruction Manual

D100320X012

Table 5. Style H or J Mounting Dimensions

ACTUATOR SIZE C

1051 1052

40 333 505 607 54 114 175 73

60 473 749 876 64 121 186 76

(1)

536 --- 849 64 121 186 76

40 13.12 19.88 23.88 2.12 4.50 6.88 2.88

60 18.62 29.50 34.50 2.50 4.75 7.31 3.00

(1)

1. Size 70 available in 1052 only.

21.12 --- 33.44 2.50 4.75 7.31 3.00

Figure 4. Fisher 1051 Mounting Dimensions (refer to table 5)

1/4 NPT

Inch

C(DIA)

1051 and 1052 H & J Actuators

October 2012

F H P Y

1/4 NPT

WOODRUFF KEY

19A1465-C

1051 STYLE J

MOUNTING ADAPTATION

NOTE:

SEE PARTS LIST FOR WOODRUFF KEY NUMBERS

C0577-3

19A1459-B

1051 1051 STYLE H

MOUNTING ADAPTATION

1051 and 1052 H & J Actuators

October 2012

Instruction Manual

D100320X012

Figure 5. Fisher 1052 Mounting Dimensions (refer to table 5)

C(DIA)

19A1461-D

1/4 NPT

1052

1/4 NPT

S(DIA)

19A1461-D

1052 STYLE J MOUNTING ADAPTATION

FOR 44.5 AND 50.8 mm (1-3/4 AND 2-INCH)

KEYED EQUIPMENT SHAFT

WOODRUFF KEY

19A1467-E /

1052 STYLE J ADAPTATION

9.5 THRU 38.1 mm (3/8 THRU 1-1/2-INCH) OUTPUT SHAFTS

NOTE:

SEE PARTS LIST FOR WOODRUFF KEY NUMBERS

C0676-3

S

19A1461-G

1052 STYLE H ADAPTATION

12.7 THRU 38.1 mm (1/2 THRU 1-1/2-INCH) OUTPUT SHAFTS

Instruction Manual

D100320X012

Table 6. Style H Mounting Dimensions

ACTUATOR

SIZE 1051

40 40 22.2 7/8 26.2 1.03 19.1 0.75

40 & 60

1. Tolerance for the K dimension is indicated by showing maximum and minimum dimensions.

ACTUATOR

SIZE 1052

40 & 60 28.6 1-1/8 26.2 1.03 19.1 0.75

40, 60 & 70 38.1 1-1/2 28.4 1.50 28.4 1.12

ACTUATOR

OUTPUT SHAFT

DIAMETER

mm Inch mm Inch mm Inch mm Inch mm Inch mm Inch

V L K

Figure 6. Fisher 1051 and 1052 Style H Mounting Dimensions (refer to table 6)

S(DIA)

15.75

15.62

22.10

21.97

28.45

28.32

(1)

0.620

0.615

0.870

0.865

1.120

1.115

1051 and 1052 H & J Actuators

October 2012

T U

57.2 2.25 28.4 1.12

76.2 3.00 38.1 1.50

88.9 3.50 44.5 1.75

5/16-18

UNC

3/8-16

UNC

1/2-13

UNC

19A1461-D A4997

22.2 THRU 38.1 mm

(7/8 THRU 1-1/2 INCH)

OUTPUT SHAFTS WITH

STYLE H MOUNTING

19A1459-B

W(DIA)

22.2 THRU 38.1 mm (7/8 THRU 1-1/2 INCH) OUTPUT SHAFTS WITH

STYLE H MOUNTING

A3254-1

1051 and 1052 H & J Actuators

October 2012

Instruction Manual

D100320X012

Table 7. Style J Mounting Dimensions

INNER

(1)

0.375

0.377

0.500

0.502

0.626

0.628

0.750

0.752

1.0010

1.0025

1.250

1.252

1.501

1.503

1.750

1.752

2.001

2.004

V L

137 5.38 39.6 1.56 15.7 0.62 117 4.62 --- --- 11.2 0.44

160 6.31 49.3 1.94 25.4 1.00 146 5.75 31.8 1.25 11.2 0.44

160 6.31 47.8 1.88 20.6 0.81 146 5.75 31.8 1.25 11.2 0.44

160 6.31 47.8 1.88 17.5 0.69 146 5.75 31.8 1.25 11.2 0.44

148 5.81 68.3 2.69 30.2 1.19 210 8.25 50.8 2.00 17.5 0.69

148 5.81 68.3 2.69 23.9 0.94 210 8.25 50.8 2.00 17.5 0.69

123 4.84 69.9 2.75 --- --- 88.9 3.50 44.5 1.75

(2)

K T U W

ACTUATOR

SIZE 1051

& 1052

40 & 60

60 & 70

1. Tolerance for the Coupling Inner diameter isindicated by showing maximum and minimum dimensions.

2. The L dimension is the matchline to the end of the actuator shaft.

3. Size 70 is only available for the 1052.

4. 25.4 mm deep.

5.1inchdeep.

VALVE SHAFT

DIAMETER

mm Inch mm Inch mm Inch mm Inch mm Inch mm Inch mm Inch mm Inch

9.5 3/8

12.7 1/2

15.9 5/8

19.1 3/4

25.4 1

31.8 1-1/4

(3)

38.1 1-1/2

(3)

44.5

&50.8

50.8 2

1-3/4&244.45

COUPLING

DIAMETER

9.53

9.58

12.70

12.75

15.90

15.95

19.05

19.10

25.43

25.48

31.75

31.80

38.13

38.18

44.50

50.83

50.90

Figure 7. Fisher 1051 and 1052 Style J Mounting Dimensions (refer to table 7)

1/2-13

UNC 1/2-13

UNC

1/2-13

(4)

(5)

UNC 1/2-13

(4)

(5)

UNC

19A1461-G

STYLE J MOUNTING

44.5 and 50.8 mm (1-3/4 and 2-INCH)

COUPLING INNER DIAMETER

19A1465-B

9.5 AND 12.7 mm

(3/8 AND 1/2 INCH) VALVE SHAFTS

WITH STYLE J MOUNTING

A3254-1

COUPLING INNER DIAMETER

S

19A1465-B A4996

COUPLING INNER

STYLE J MOUNTING

9.5 through 38.1 mm

(3/8 through 1-1/2 INCH)

DIAMETER

19A1465-B

W(DIA)W(DIA)

15.9 THROUGH 38.1 mm

(5/8 THROUGH 1-1/2 INCH)

VALVE SHAFTS WITH STYLE J MOUNTING

WOODRUFF KEY

MOUNTING YOKE (KEY 22)

19A1459-B

44.5 AND 50.8 mm (1-3/4 AND 2-INCH) KEYED EQUIPMENT SHAFTS WITH

STYLE J MOUNTING

A3254-1

Instruction Manual

D100320X012

Table 8. Approximate Actuator Weights

SIZE

40 60 70

Kg Lb Kg Lb Kg Lb

43 89

---

1051 1052 TOP-MOUNTED HANDWHEEL

197

---

45 92

123

99 203 272

1051 and 1052 H & J Actuators

October 2012

7.3 11

21.3

16 24 47

Table 9. Keyway Alignment Information

(1)

VALVE SHAFT KEYWAY TO USE FOR FISHTAIL™ DISC VALVE BODIES

DESIRED

ACTUATOR

ACTION

DESIRED SHAFT

ROTATION,

DEGREES

ACTUATOR

MOUNTING

POSITION

COUPLING

KEYWAY TO

(3)

USE

Clockwise to

Close Valve Action

Flow Left to

(4)

Right

(SEE FIGURE 10)

(4)

Flow Right to

(4)

Left

Counterclockwise to Close Valve Action

Flow Left to

(4)

Right

(4)

Flow Right to

(4)

Left

1 B Nose Tail Tail Nose

Push Down to

Open (PDTO)

60 or 90

2 A Tail Nose Nose Tail 3 B Tail Nose Nose Tail 4 A Nose Tail Tail Nose 1 A Tail Nose Tail Nose

Push Down to

Close (PDTC)

(5)

or 90

2 B Tail Nose Tail Nose 3 A Nose Tail Nose Tail 4 B Nose Tail Nose Tail

1. For actuators with J mounting.

2. For conventional disc valve bodies, use eithervalve shaft keyway.

3.Seefigure10forreferencecouplingorientationtousewiththistable.

4. When viewed from actuator side of valve body.

5. For 60-degree rotation with PDTC action, the coupling and actuator output shaft assembly will be offset 30 degrees clockwise (for actuator housing construction style B) or counterclockwise (for actuator housing construction Style A) in the lever when viewed from the splined end of the actuator shaft. 30 degrees is one spline tooth for 9.5, 12.7, and 15.9mm (3/8, 1/2, and 5/8-inch) valve shaftsand two splineteeth for 19.1 through 38.1 mm (3/4 through 1-1/2 inch) valve shafts.

Figure 8. Valve Shaft Coupling

(2)

COUPLING

FULL KEYWAY LOCATED ON NOSE AND TAIL SIDE OF VALVE SHAFT

VALVE SHAFT

USE APPROPRIATE LETTERED KEYWAY AS INDICATED IN TABLE 9

USE APPROPRIATE

PARTIAL KEYWAY FOR DETERMINING DISC POSITION

VALVE SHAFT KEYWAY AS INDICATED IN TABLE 9

EXPLODED VIEW OF VALVE SHAFT

AND COUPLING

NOTE:

FOR USE WITH J MOUNTING ADAPTATION (UP TO 50.8 mm (2-INCH) KEYED SHAFT DIAMETERS.

A3253-1

KEYWAY A

KEYWAY B ABOVE KEYWAY A

19B1465-B

REFERENCE COUPLING ORIENTATION

FOR TABLE 9

1051 and 1052 H & J Actuators

October 2012

Figure 9. Center of Gravity Dimensions

Instruction Manual

D100320X012

ACTUATOR TYPE ACTUATOR SIZE

1051

1052

40 15 0.6 191 7.5 60 10 0.4 361 14.2 40 15 0.6 241 9.5 60 10 0.4 432 17.0 70 23 0.9 488 19.2

X Y

mm Inch mm Inch

19A1459-B A3255

Loading Connection

1. Connect the loading pressure piping to the pressure connection in the top of the diaphragm casing.

For size 40 through 60 actuators, run either NPS 1/4 pipe or 3/8-inch tubing between the NPT 1/4 pressure connection and the positioner or automatic controller.

For size 70 actuators, run either pipe or tubing between the pressure connection and the positioner or automatic controller. If necessary, remove the 1/4-inch bushing in the pressure connection to increase connection size.

2. Keepthelengthofpipeortubingasshortaspossibletoavoid transmission lag in the control signal. If an accessory (such as a volume booster or a positioner) is used, be sure that the accessory is properly connected to the actuator. If a positioner is part of the assembly, the pressure connection to the actuator will normally be made at the factory.

3. When the actuator is completely installed and connected to the instrument, check for correct action (air-to-open or air-to-close) to match the controlling instrument. For successful operation, the actuator stem and operating shaft mustmovefreelyinresponsetotheloadingpressurechangeonthediaphragm.

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