Quarter Turn

THD/THS

Compact quarter-turn hydraulic actuators for on-off and modulating control of ball, butterfly, plug or damper style valves in heavy duty service. Available with output torques up to 300,000 Nm

Designed with a unique helical slot design, which transforms the linear movement of a piston into a quarter-turn rotation, generating high break torques to actuate large valves. With its spring integrated into the cylinder, it is very compact with the same dimensions whether for double-acting or spring return; spring to open or spring to close operations.

Features & Benefits:

  • Customizable helical profile to suit valve- specific torque profile (special execution).
  • Totally enclosed, weatherproof housing in fabricated carbon steel provides maximum strength.
  • Painting according to corrosion EN 15714- 3 with protection level C4 and C5 I/M with Norsok approved paint and on site Frosio and Nace inspector.
  • nternal coating and special surface treatment protects against corrosion.
  • Hard chrome-plated piston rod for corrosion resistance and minimal friction.
  • Electroless nickel-plated cylinder bore provides maximum corrosion resistance and reliability.
  • Low hysteresis and high response enhance modulating service.
  • Bearings in bronze or sintered bronze impregnated with PTFE provide reliability, smooth operation and extended service life.
  • Adjustable end stopper installed below cylinder flange for easy access.
  • Position indicator directly connected to output drive.
  • Certified IP68 for installation up to 100m water depth

APPROVALS

Safety Integrity Level: (IEC 61508-1÷7:2010): SIL3
Hazardous area: European Directive ATEX
Enclosure Standards: (IEC 60529): IP66, IP67M and IP68M
Machinery Directive: 2006/42/EC

TECHNICAL DATA

Design pressure: 350 bar g
Supply medium: Mineral oil
Output torque: up to 300,000 Nm
Ambient temperature Standard range (PED compliant): -20°C to +100°C (-4°F to +210°F)
Low temperature range (PED compliant): -40°C to +100°C (-40°F to +210°F)
Low temperature ranges: -60°C to +100°C (-76°F to +210°F)
External angular stroke adjustment: ± 5°
Valve attachment interface: To ISO 5211

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Technical Data Sheets

THD/THS COMPACT HYDRAULIC ACTUATORS (English)

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Certificates, Approvals & Qualifications

PED Module H H1 2019 07 (English)

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Certificates, Approvals & Qualifications

THD/THS IP68 (English)

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Certificates, Approvals & Qualifications

THS IEC 61508 SIL 3 (English)

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Certificates, Approvals & Qualifications

THD IEC 61508 SIL 3 (English)

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