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Pneumatic Piston Actuator

1. Overview

This series is a pneumatic piston actuator with large output force and high performance. It is used in combination with straight-stroke control valves, including globe valves, cage valves, gate valves, etc. The design of this series of actuators can make the control valve reliable on-off or regulating control.

This series of actuators are divided into two types, single-acting and double-acting. Single-acting actuators are divided into two types, direct-acting (GD-Z) and counter-acting (GD-F). They are spring-loaded cylinder-type actuators; and double-acting (GD-F) -D) The actuator is a cylinder type actuator that is controlled by air pressure without spring loading, and its mechanism positions the valve core according to the constantly changing pneumatic loading pressure on the cylinder.

See the figure on the right for an example of a pneumatic piston actuator.

 
 Installation example

2. Standard Specification

Series

GD

Specification

20、30、31、40、41、42、43、50

Output Method

Straight stroke

Action

Double acting: GD-D

Single action: GD-Z (positive action), GD-F (reverse action)

Maximum Output Thrust

See table 1

Stroke

See table 1

Air Pressure

600Kpa

Piping Interface

Please refer to pages 8-12

Ambient Temperature

Standard type: -40℃~82℃

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

Spring Range

Positive effect:20~100Kpa、80~200Kpa
Reaction:140~260Kpa、200~300Kpa

Material of Main Parts

Standard

Upper and lower cover plates: Steel , 

Sealing ring: Viton , O-ring: Nitrile rubber , 

Stroke indicator: Stainless steel , 

Pointer: Stainless steel , 

Actuator spring: Spring steel , 

Actuator guide rod: Steel , 

Wafer block: Galvanized steel surface , 

Bracket: cast iron , Piston: Steel , Pillar: Steel Cylinder: Steel , Hand wheel: Ductile iron

Special Type

Sealing ring, O-ring: Viton (-18℃~149℃), Silicone synthetic rubber (-54℃~149℃),

Upper and lower cover: Stainless steel , 

Actuator guide rod: Stainless steel , 

Column: Stainless steel,

Piston: Stainless steel , Cylinder: 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 Double Acting


Figure 1-2 Single Acting

GD-Z type (positive acting-air shut type)                      GD-F type (reaction-air open)

Table 1 Output Thrust, Stroke and Weight

Executive Agency

Rated

stroke

(mm)

Effective area of cylinder(cm2)

Turn off the thrust(kgf)

Spring pressure(Kpa)

Operating pressure(Kpa)

Approximate weight(kg)

Types

Series

Specification

Without handwheel

Top loading handwheel

Side-mounted handwheel

GD-Z

22

20

38

380

1520

20~100

600

32

45

65

33

30

51

706

2824

56

64

72

31

76

61

69

77

44

40

76

1385

5540

92

105

123

41

102

98

111

129

42

127

103

116

134

43

200

112

125

143

55

50

200

2289

9156

123

142

156

GD-Z-T

22

20

38

380

1216

80~200

600

33

46

66

33

30

51

706

2259

57

65

73

31

76

62

69

78

44

40

76

1385

4432

93

106

124

41

102

99

112

130

42

127

105

118

136

43

200

114

127

145

55

50

200

2289

7325

125

144

158

GD-F

22

20

38

380

760

200~300

600

33

46

67

33

30

51

706

1412

58

65

73

31

76

64

71

79

44

40

76

1385

1939

140~260

93

107

125

41

102

99

113

131

42

127

106

120

138

43

200

117

131

149

55

50

200

2289

3204

125

144

159

GD-D

22

20

38

380

1900

Without spring

600

30

43

63

33

30

51

706

3530

54

65

70

31

76

57

68

73

44

40

76

1385

6925

90

103

121

41

102

94

107

125

42

127

97

110

128

43

200

104

117

135

55

50

200

2289

11445

115

137

148

3. Other Configurations Can Be Provided

Top/side Mounting Handwheel

To meet manual operation in emergency situations, the GD type actuator can be equipped with a top-mounted or side-mounted handwheel assembly.

The fixed handwheel on the GD type actuator can be used to set the travel limit in the upward direction. The handwheel of GD-Z 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 GD-F type actuator, counterclockwise rotation will move the push rod upward; when it is rotated clockwise, the spring will push the push rod downward.

The side-mounted handwheel on the GD 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: Model: GD44-Z-S


        Means: Positive-acting actuator, 44 cylinder, with top-mounted handwheel


Figure 2 Standard piping circuit


    Figure 2-1 Positioner automatic control


        Figure 2-1A Double acting

      Figure 2-1B Single-acting-positive acting

        Figure 2-1C Single-acting-Counter-acting   

Figure 2-2 Automatic control of positioner and solenoid valve


     Figure 2-2A Double acting

   Figure 2-2B Single acting (positive acting)

     Figure 2-2C Single action (reverse action)

GD type no handwheel mechanism

Size                                                                        Unit:mm

Series

Specification

Rated

stroke


φB

C

φD

E

φF

G

H

H3

(Off) 

φK

Air supply piping interface

22

20

38

71

24

13.5

15

138

170

429

123

285

1/4"NPT

33

30

51

90

35

20

15

160

204

528

172

385

1/2"NPT

31

76

90

35

20

15

160

204

755

172

385

1/2"NPT

44

40

76

90

35

20

15

200

246

845

186

520

3/4"NPT

41

102

90

35

20

15

200

246

930

186

520

3/4"NPT

42

127

90

35

20

15

200

246

980

186

520

3/4"NPT

43

200

90

35

20

15

200

246

1157

186

520

3/4"NPT

55

50

200

90

35

20

15

200

260

1981

186

660

3/4"NPT

Note: 1. M1 thread size: GD22 series are 3/4"-16UNF; GD33, GD44, GD55 series are 1-1/8"-12UNF;

        2. M2 thread size: GD22 series are 1/2"-20UNF; GD33, GD44, GD55 series are 3/4"-16UNF.

GD top mounted handwheel mechanism

Size                                                                        Unit:mm

Series

Specification

Rated

stroke


φB

C

φD

E

φF

G

H

H1

H3
(Off) 

φK

φW

Air supply piping interface

22

20

38

71

24

13.5

15

138

170

429

680

123

285

250

1/4"NPT

33

30

51

90

35

20

15

160

204

528

780

172

385

280

1/2"NPT

31

76

90

35

20

15

160

204

755

1150

172

385

280

1/2"NPT

44

40

76

90

35

20

15

200

246

845

1240

186

520

400

3/4"NPT

41

102

90

35

20

15

200

246

930

1360

186

520

400

3/4"NPT

42

127

90

35

20

15

200

246

980

1360

186

520

400

3/4"NPT

43

200

90

35

20

15

200

246

1157

1650

186

520

400

3/4"NPT

55

50

200

90

35

20

15

200

260

1981

2550

186

660

400

3/4"NPT

Note: 

1. M1 thread size: gd22 series is 3 / 4 "- 16unf; Gd33, gd44 and GD55 series are 1-1 / 8 "- 12unf;

2. M2 thread size: 1 / 2 "- 20unf for gd22 series; Gd33, gd44 and GD55 series are 3 / 4 "- 16unf.

GD type side mounted handwheel mechanism

Size                                                                        Unit:mm

Series

Specification

Rated

stroke


φB

C

φd

E

φF

G

H

H1

H3
(Off)

φK

L

L1

φW

22

20

38

71

24

13.5

15

138

170

429

680

123

285

220

280

250

33

30

51

90

35

20

15

160

204

528

780

172

385

280

300

280

31

76

90

35

20

15

160

204

755

1150

172

385

280

300

280

44

40

76

90

35

20

15

200

246

845

1240

186

520

350

350

400

41

102

90

35

20

15

200

246

930

1360

186

520

350

350

400

42

127

90

35

20

15

200

246

980

1360

186

520

350

350

400

43

200

90

35

20

15

200

246

1157

1650

186

520

350

350

400

55

50

200

90

35

20

15

200

260

1981

2550

186

660

380

350

400

Note: 

1. M1 thread size: gd22 series is 3 / 4 "- 16unf; Gd33, gd44 and GD55 series are 1-1 / 8 "- 12unf;

2. M2 thread size: 1 / 2 "- 20unf for gd22 series; Gd33, gd44 and GD55 series are 3 / 4 "- 16unf;

3. Size of air supply piping interface: 1 / 4NPT for gd22 series, 1 / 2NPT for gd33 series, and 3 / 4NPT for gd44 and GD55 series.