Quarter Turn

ALGA/ALGAS/ALGAS-QA

Double acting and spring return pneumatic quarter turn actuators for on-off and modulating control of valves in heavy duty service. Available for output torques to 750,000 Nm.

Features & Benefits:

  • Totally enclosed, weatherproof housing in fabricated carbon steel for maximum strength.
  • Guide bar resists transverse loads and supports the piston rod.
  • Hard chromium plated alloy steel material guarantees corrosion protection and minimal friction.
  • PTFE-impregnated bronze or sintered bronze bushings provide minimal friction and extended service life.
  • Scotch yoke design with canted or symmetric torque arm allows close working to distinctive valve torque profiles.
  • External travel stops for precise angular stroke adjustment between 82° and 98°.
  • Electroless nickel plated and polished cylinder provides maximum corrosion resistance and reduces friction.
  • Floating type piston seals provide low hysteresis and high sensitivity, preventing sticking problems.
  • ALGAS spring return pack incorporates up to four springs, fully encapsulated in a factory welded cartridge ensuring personnel safety and simplifying assembly.
  • ALGAS spring action can be changed easily in the field from to close to open or vice versa.
  • Special coatings for offshore or corrosive environments.

General application
ALGA, ALGAS and ALGAS-QA pneumatic actuators are designed for on-off or modulating control of quarter turn ball, butterfly, plug or damper style valves.

Approvals
Safety integrity level:
(IEC 61508-1÷7:2010): SIL 3
Area classification:
(ATEX): II 2GD 135ºC (T4)
Enclosure standards:
(IEC 60529): IP67M
(ANSI/NEMA 250): NEMA 4, 4X, 6
Pressure equipment Directive:
PED 97/23/EC
Machinery Directive:
2006/42/EC

Technical data
Design pressure: 12 bar g
Supply medium: Air, nitrogen or sweet gas Sour gas version available
Output torque
ALGA: Double acting torque up to 750,000 Nm
ALGAS/ALGAS-QA: Spring starting torque up to 335,000 Nm
Spring end torque up to 235,000 Nm
Ambient temperature
Standard range: -30°C to +100°C (-20°F to +210°F)
Extended temperature range available

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Technical Data Sheets

ALGA/ALGAS Pneumatic Actuator (Metric) (English)

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Technical Data Sheets

ALGA/ALGAS Pneumatic Actuator (Imperial) (English)

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Certificates, Approvals & Qualifications

ALGA ALGAS OLGA OLGAS GIG GIGS GPO OLGA H OLGAS H Ex II GD 135°C T4 (English)

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Certificates, Approvals & Qualifications

ALGA ALGAS IP67M NEMA 4 4X (English)

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Certificates, Approvals & Qualifications

ALGAS IEC 61508 SIL 3 (English)

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Certificates, Approvals & Qualifications

ALGA IEC 61508 SIL 3 (English)

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Certificates, Approvals & Qualifications

EAC DoC Certificate All Pneumatic and Hydraulic Actuators (English)

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Certificates, Approvals & Qualifications

ALGAS IP66 (English)

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Certificates, Approvals & Qualifications

PED Module H H1 2019 07 (English)

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Certificates, Approvals & Qualifications

EN 60529 IP66, IP66M (English)

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Certificates, Approvals & Qualifications

ALGA/ALGAS EAC CoC (Russian)

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