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Pneumatic Diaphragm Actuator

1. Overview

This series is a linear pneumatic diaphragm actuator with multi-spring structure, light weight, small size, large output driving force and high performance. Its working principle is: The air pressure converted from the electric or pneumatic signal of the regulating instrument by the positioner is input into the diaphragm chamber, acting on the diaphragm to generate thrust, which causes the output shaft to move, and at the same time compresses the spring until it matches the reaction force of the spring. Balance so that the output shaft reaches the predetermined position. Position control can also be achieved by direct action of the air signal on the diaphragm. This series of actuators are divided into two types, positive acting (957) and counteracting (967). The design of the actuator enables the control valve to be reliably switched or regulated. See the figure on the right for the installation example of pneumatic actuator.
 Installation example

2. Standard Specifications

Series

957、967

Form

Multi-spring structure

Specification

20、30、34、40、45、50、70

Action

1. Positive action 2. Reverse action

Maximum Output Thrust

See table 1

Stroke

See table 2

Supply Pressure

320Kpa

Spring Range

Positive effect:20~100Kpa、40~200Kpa
Reaction:80~200Kpa、120~240Kpa

Ambient Temperature

Standard type: -40℃~82℃

Special type (optional): -18℃~149℃, -54℃~149℃

Material of Main Parts

Standard

Membrane housing: steel , Membrane: nitrile rubber , Membrane plate: steel , O-ring: Nitrile rubber , 

Stroke indicator: stainless steel , Pointer: stainless steel,

Actuator spring: steel , 

Actuator guide rod: steel surface galvanized,

Wafer block: galvanized steel surface , Bracket: cast iron , Hand wheel: nodular cast iron

Special Type

Membrane: Fluorine rubber (-18℃~149℃), Silicone synthetic rubber (-54℃~149℃),

O-ring: Silicone synthetic rubber , 

Actuator guide rod: Stainless steel,

Connecting bolt: Stainless steel

Painting Color

Orange

Attachment

Positioners, air filter pressure reducers, limit switches, solenoid valves, retaining valves, amplifiers, etc.

Optional Equipment

Manual operating mechanism, special air piping and special air joints, high temperature environment, low temperature environment, salt corrosion type, designated coating color, etc.

Figure 1 Structure

Figure 1-1 Positive Action (air-closed)


Figure 1-2 Reaction (air-to-open type)



3. Other Configurations Can Be Provided

Top/side mounting handwheel

In order to meet the manual operation in emergency situations, the 957 and 967 pneumatic diaphragm actuators can be equipped with a top-mounted or side-mounted handwheel assembly.

The top-mounted handwheel on the 957/967 actuator can be used to set the travel limit in the upward direction. The handwheel of 957 type actuator rotates clockwise to make the actuator push rod move downward to compress the spring; when the handwheel rotates counterclockwise, the action of the spring pushes the push rod back. For the Type 967 actuator, counterclockwise rotation will move the push rod upward; when clockwise rotation, the action of the spring will push the push rod downward.

The side-mounted handwheel on the 957/967 type actuator locates the handwheel on one side of the bracket. Through the worm gear drive, the handwheel drive can also be used as a stroke limiter.


4. Model Preparation Instructions

Example 1: Model: 957-30-S

Means: positive acting actuator, 30 actuator, with top-mounted handwheel, spring pressure range 20~100Kpa

Example 2: Model: 967L-40-C-T

Means: lengthened reaction type actuator, 40 actuator, with side-mounted handwheel, spring pressure range 120~240Kpa

Table 1 Maximum output thrust


Actuator series

Pre-compression force (Kpa)

Spring range

 (Kpa)

Air pressure (Kpa)

Maximum output thrust (Kgf)

Actuator specifications

20

30

34

40

45

50

70

957

20

20~100

320

440

770

1232

1232

1980

1980

3080

40

40~200

240

420

672

672

1080

1080

1680

967

80

80~200

160

280

448

448

720

720

1120

120

120~240

240

420

672

672

1080

1080

-

Table 2 Effective area and stroke of diaphragm

Actuator specifications

20

30

34

40

45

50

70

Diameter of film shell(mm)

240

280

340

340

470

470

560

Support

20

30

30

40

40

50

70

Effective area of diaphragm (cm2 )

200

350

560

560

900

900

1400

Standard stroke(mm)

19

19

29

38

51

51

76

Extended stroke(mm)

-

29

38

51

76

76

102

Table 3 Weight of actuator without accessories

Actuator specifications

Weight

No handwheel

Top loading handwheel

Side-mounted handwheel

20

10

20

-

30

19

29

38

34

28

45

65

40

38

55

75

45

71

122

155

50

81

132

165

70

126

180

190

      Pneumatic film actuator (standard type)

No handwheel mechanism

Top loading handwheel mechanism

        Pneumatic film actuator (standard type)

Side-mounted handwheel mechanism

Size                                                                                                                                      Unit:mm

Specification

20

30

34

40

45

50

φB

54

54

54

71

71

90

C

19

19

19

24

24

35

φD

10

10

10

13.5

13.5

20

E

15

15

15

15

15

15

φF

78

78

78

98

98

140

G

134

134

134

162

162

216

H

298

420

440

514

574

631

H1

458

579

660

734

862

919

H3(turn off)

97

97

94

123

127

172

φK

240

280

340

340

470

470

L

-

280

280

290

310

315

L1

-

159

159

250

250

310

M1

5/8″-18UNF

5/8″-18UNF

3/4″-16UNF

3/4″-16UNF

1-1/8″-12UNF

1-1/8″-12UNF

M2

3/8″-24UNF

3/8″-24UNF

3/8″-24UNF

1/2″-20UNF

1/2″-20UNF

3/4″-16UNF

φW

200

200

280

280

330

330

Itinerary

19

19

29

38

51

51

Trachea connector

1/4NPT

1/4NPT

1/4NPT

1/4NPT

1/4NPT

1/4NPT

Note: The maximum size of the air pipe joint of the actuator size 50 is 1/2NPT;

        Pneumatic film actuator (standard type)


No handwheel mechanism

Top loading handwheel mechanism

        Pneumatic film actuator (standard type)

Side-mounted handwheel mechanism

Size                                                                                                                                      Unit:mm

Specification

φB

C

φD

E

φF

G

H

H1

H3 (Off)

φK

L

L1

L2

φW

行程

70

90

35

20

15

140

216

804

1254

186

560

320

225

65

330

76

Note: 

1. M1 thread size is 1-1/8"-12UN; M2 thread size is 3/4"-16UNF;

2. The size of the air supply piping interface is 1/2NPT.

 Pneumatic film actuator (extended type)


No handwheel mechanism

Top loading handwheel mechanism

       Pneumatic film actuator (extended type)

Side-mounted handwheel mechanism

Size                                                                                                                                       Unit:mm

Specification

30

34

40

45

50

φB

54

54

71

71

90

C

19

19

24

24

35

φD

10

10

13.5

13.5

20

E

15

15

15

15

15

φF

78

78

98

98

140

G

134

134

162

162

216

H

456

480

554

614

685

H1

615

700

774

902

973

H3(turn off)

97

94

123

127

172

φK

280

340

340

470

470

L

280

280

290

310

315

L1

159

159

250

250

310

M1

5/8″-18UNF

3/4″-16UNF

3/4″-16UNF

1-1/8″-12UNF

1-1/8″-12UNF

M2

3/8″-24UNF

3/8″-24UNF

1/2″-20UNF

1/2″-20UNF

3/4″-16UNF

φW

200

280

280

330

330

Itinerary

29

38

51

76

76

Trachea connector

1/4NPT

1/4NPT

1/4NPT

1/4NPT

1/4NPT

Note: The maximum size of the air pipe joint of the actuator size 50 is 1/2NPT;

      Pneumatic film actuator (extended type)


No handwheel mechanism

Top loading handwheel mechanism

      Pneumatic film actuator (extended type)

Side-mounted handwheel mechanism

Size                                                                                                                                   Unit:mm

Specification

φB

C

φD

E

φF

G

H

H1

H3(Off)

φK

L

L1

L2

φW

Stroke

70

90

35

20

15

140

216

875

1325

186

560

320

225

65

330

102

Note: 

1. M1 thread size is 1-1/8"-12UN; M2 thread size is 3/4"-16UNF;

2. The size of the air supply piping interface is 1/2NPT.