LD

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Pneumatic Actuator
LD-838-PA Pneumatic Actuator
LD-838-PA Pneumatic Actuator LD-838-PA Pneumatic Actuator
LD-838-PA Pneumatic Actuator
LD-838-PA Pneumatic Actuator

LD-838-PA (PP)

Butterfly Valve - Pneumatic Actuator

  • Available in Double Acting and Single(Spring) Acting configurations to support automation and fail-safe system applications.
  • Normal Operating Pressure: 2.8–8.4 kgf/cm², designed for standard industrial air supply systems.
  • Maximum Allowable Pressure: 10.5 kgf/cm², providing additional structural safety margin beyond normal operating conditions.
  • Compatible with dry or lubricated non-corrosive gases, offering flexibility in air supply requirements.
  • Operating Temperature Range: -40°F to +200°F, suitable for outdoor and harsh environmental installations.
  • Reinforced rib design enhances disc structural strength.
  • Low operating torque with high mechanical strength, corrosion resistance, and extended service life.
  • Valve body design incorporates an integrated seat seal to ensure low torque operation and long-term durability.
  • Compliant with ISO 5211 mounting interface standards (F05, F07, F10), enabling easy installation and replacement of pneumatic or electric actuators.

    • Please contact us for Flow Rate, CV Value, Working Pressure/Temperature, Pressure Loss, and other technical information.

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Description

Material

Body: PP
Seat: EPDM, FKM (FPM)

Standard

Flange: ANSI, BS, JIS, TABLE D&E
Working Pressure:
2" - 6": 150 PSI @ 73°F
8" - 12": 100 PSI @ 73°F

Standard

Flange: DIN, ISO
Working Pressure:
DN50 - DN150: PN10 BAR @ 22°C
DN200 - DN300: PN6 BAR @ 22°C

Pressure(PSI) vs. Temperature(°C)

Body PVC
Valve Size (Inches) 0–49°C 50–60°C 61–80°C
2" 150 70 30
2-1/2" 150 70 30
3" 150 70 30
4" 150 45 30
5" 150 45 30
6" 150 45 30
8" 100 30 15
10" 100 30 15
12" 100 25 10
Specification

Actuator Design & Reliability Features

  • Designed for long service life with manufacturer-applied lubrication, ensuring reliable operation for a minimum of 1,000,000 cycles.
  • NAMUR interface design for air supply ports and upper mounting, enabling direct installation of solenoid valves and accessories.
  • Compliant with ISO 5211 and DIN 3337 standards for mounting and square shaft compatibility, ensuring easy integration with standard valves.
  • Low-friction internal slide ways prevent metal-to-metal contact, reducing wear and allowing easy replacement during maintenance.
  • External surface protection tested to 500 hours salt spray resistance in accordance with ASTM B117.
  • Each actuator undergoes 100% running and sealing tests, with individual serial number identification for full traceability.


Operation

Double-Acting (Top View A)
Double-Acting actuator, top view A
For clockwise output, apply pressure to P2, which forces the pistons to move together. The volume between the pistons is exhausted at P1.
Double-Acting (Top View B)
Double-Acting actuator, top view B
For counterclockwise output, apply pressure to P1, which forces the pistons apart. The linear travel of the pistons is converted to a rotation of the drive shaft by the rack to pinion connection. The volume outside each piston is exhausted at P2.
Single(Spring)-Acting (Top View A)
Spring-Acting actuator, top view A
For clockwise output, the volume between the pistons is exhausted at P1, causing the springs to force the pistons together. The volume outside the pistons is vented at P2.
Single(Spring)-Acting (Top View B)
Spring-Acting actuator, top view B
For counterclockwise output, apply pressure to P1, which forces the pistons apart and compress the springs. The linear travel of the pistons is converted to a rotation of the drive shaft by the rack to pinion connection. The volume outside each piston is exhausted at P2.




Single-Acting Spring Return Actuator

Model Spring Set Spring Torque Output (kgf·cm) Air Torque Output at Operating Pressure (kgf·cm)
Start End 40 60 80 100 120
Start End Start End Start End Start End Start End
LD-250 2 79.5 51.8 86.4 54.1 159.0 125.6 231.6 198.1 303.1 269.6 375.6 359.4
3 119.8 77.2 - - 130.2 80.6 202.8 153.2 263.8 224.6 346.8 297.2
4 161.3 103.7 - - 101.4 35.7 173.8 107.1 245.4 179.7 318.0 251.1
5 201.6 129.0 - - - - 145.2 62.2 217.7 133.6 289.2 206.2
6 240.8 155.5 - - - - - - 188.9 88.7 261.5 160.1
LD-450 2 145.2 93.3 155.5 95.6 285.7 225.8 415.9 356.0 544.9 485.0 675.1 614.0
3 218.9 139.4 - - 233.9 144.0 364.0 274.2 493.1 403.2 623.2 533.4
4 292.6 186.6 - - 182.0 62.2 312.2 192.4 441.2 321.4 571.4 451.6
5 365.2 232.7 - - - - 260.4 110.6 390.5 240.8 519.6 369.8
6 438.9 279.9 - - - - - - 337.5 157.8 467.7 289.2
LD-1000 2 321.4 206.2 345.6 212.0 632.4 498.8 919.3 785.7 1207.3 1072.5 1494.1 1360.5
3 481.5 311.0 - - 517.2 320.3 804.1 606.0 1090.9 892.8 1377.8 1180.8
4 644.0 414.7 - - 403.2 138.2 690.0 427.4 976.9 711.9 1263.7 998.8
5 804.1 518.4 - - - - 576.0 244.2 862.8 534.5 1149.7 817.9
6 966.5 622.1 - - - - - - 748.8 350.2 1035.6 641.7
LD-2250 2 759.2 453.9 794.9 455.0 1442.3 1103.6 2092.0 1751.2 2745.4 2400.8 3384.1 3049.3
3 1140.5 679.7 - - 1191.2 680.8 1838.6 1329.4 2487.2 1977.0 3136.3 2626.6
4 1520.6 906.6 - - 940.0 260.4 1588.6 907.8 2337.4 1555.2 2885.8 2204.9
5 1900.8 1132.4 - - - - 1337.5 488.4 1986.0 1132.4 2635.8 1783.0
6 2281.0 1360.5 - - - - - - 1735.0 715.4 2382.5 1360.5
LD-3650 2 1213.1 699.3 1327.1 759.2 2376.6 1808.6 3427.2 2859.3 4476.7 3908.7 5526.1 4959.4
3 1812.1 1050.6 - - 1988.4 1147.4 3037.8 2196.9 4088.4 3247.5 5137.9 4297.0
4 2408.8 1402.0 - - 1599.0 487.3 2649.6 1537.9 3699.1 2587.4 4749.7 3636.9
5 3024.0 1749.9 - - - - 2266.0 857.1 3315.5 1906.6 4364.9 2956.0
6 3621.9 2101.2 - - - - - - 2926.1 1246.5 3976.7 2297.1
LD-5000 2 1797.1 904.3 1832.0 925.1 3201.6 2293.0 4573.4 3663.4 5944.3 5043.8 7315.2 6416.6
3 2695.7 1359.4 - - 2741.8 1382.4 4112.6 2764.8 5483.5 4134.7 6865.9 5506.6
4 3605.8 1809.6 - - 2281.0 476.9 3663.4 1843.2 5030.2 3225.6 6405.1 4596.5
5 4506.7 2257.9 - - - - 3201.6 939.8 4573.4 2315.5 5944.3 3686.4
6 5402.9 2718.7 - - - - - - 4112.6 1405.4 5483.5 2776.3
LD-11000 2 3916.8 1981.4 3985.9 2027.5 6976.3 5026.6 9970.3 8013.9 13017.6 11007.6 16012.8 14054.4
3 5875.2 2960.6 - - 5980.8 3052.8 8977.9 6036.5 11980.8 9035.0 14977.6 11980.8
4 7820.0 3950.9 - - 4988.2 1073.7 7982.6 4066.6 10986.2 7064.2 13986.2 10057.0
5 9778.1 4941.9 - - - - 6988.3 2083.7 9970.3 5079.7 13017.6 8179.4
6 11750.4 5937.6 - - - - - - 8977.9 3108.0 11980.8 6105.6




Pneumatic Rack & Pinion Actuators TORQUE RATINGS
Double Acting Actuators

Model Air Torque Output at Operating Pressure (kgf-cm)
40 60 80 100 120
LD-125 81.8 123.3 161.3 208.5 246.5
LD-250 142.9 218.9 288.0 367.5 436.6
LD-450 284.6 433.2 576.0 729.3 866.4
LD-1000 576.0 864.1 1152.1 1440.1 1728.1
LD-2250 1296.1 1943.6 2592.2 3239.7 3888.3
LD-3650 2102.6 3154.4 4205.2 5257.0 6307.7
LD-5000 2880.2 4320.4 5760.5 7200.6 8640.8
LD-11000 6336.5 9504.8 12673.1 15841.4 19009.6




Pneumatic Rack & Pinion Actuators TORQUE RATINGS
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