LPC actuator is suitable for use in on/off, modulating and control applications of quarter-turn valves in general service and protective services. It can also be used in safety services such as emergency shutdown (ESD) or high-integrity pressure protection systems (HIPPS), up to and including SIL 3 Level in accordance with IEC 61508. Among the most important benefits of this product:

Industry-leading, 25-year design life, depending on service conditions, proper installation, operation and maintenance.

Maintenance intervals up to five years, for most applications, or as prescribed in EN 15714 for high-cycle applications

Warranty terms exceeding typical industry norms

Modular construction to reduce initial cost, minimize repair cost and maximize process availability

Maximum allowable working pressure (MAWP): 12 barg (174 psig)

Torque range up to 1600 Nm (1180 ft-lb); contact factory for larger sizes

-29°C to 100°C (-20°F to 212°F) standard operating temperature range; Low temperature -60°C (-76°F) and high temperature 160°C (320°F) ranges available upon request (polar, cold, arid and tropical temperature requirements in accordance with IEC 60721)

Quick stroking times — less than 0.5 seconds, subject to technical evaluation

Spring Return Single Acting (Fail Close CW and Fail Open CCW) and Double Acting (Fail Last / Fail-as-is) executions

Symmetrical and Canted Scotch yoke types to perfectly fit valve torque requirement

Housing constructed in ASTM A536 60-40-18 Nodular Ductile Cast Iron; different materials of construction upon request

Carbon Steel ENP lined Cylinders; Stainless Steel Cylinders, Tie Rods and Spool Pieces available upon request

End mounted adjustable travel stops ± 5°

Full range of accessories: switchboxes, positioners; ESD and PST functionalities; custom control panels; fire protection; manual and hydraulic overrides

Newly developed controls packages for precise torque control and safety functionality

 

Product Features

Compact design with springs installed on the same side of the cylinder and retained by the piston and piston rod, features a true modular design with modules assembled and tested as separates units. The push-to-compress springs are safely enclosed by tie rods and positively retained on the torque module under all load conditions. The pneumatic cylinder proven and reliable design with external tie rods is suitable for continuous duty service at the maximum rated pressure. The LPC is designed for a maximum allowable working pressure of 12 barg (174 psig), as standard for operation across a full range of applications. Its low displacement design reduces operation and controls package costs. The actuator is available in single-acting spring return (Fail Close CW and Fail Open CCW) and double-acting (Fail Last / Fail as Is) Upon request, available in balanced weight configuration, with cylinder and spring installed on opposite sides of central body (for this option, contact Flowserve).

Reliable scotch yoke design minimizes transverse loads and is suitable for high cycles applications. A symmetrical yoke is standard, and a canted yoke is available optionally. The torque and pressure modules include numerous heavy-duty features, including:

High-strength, heat-treated alloy steel guide bar is hard chrome plated for wear and corrosion protection

Guide block for directional alignment of linear forces, transfer of side loads to the guide bar, and transfer of torque to the yoke

High-strength yoke pin for maximum torque transfer while minimizing wear and localized stresses

Wear and corrosion protection of all components is ensured with suitable treatments and coatings.

Electroless nickel plating is the standard for the internal surface of the pneumatic cylinder to ensure complete sealing and superior corrosion resistance. Other coatings for the internal surface of the cylinder are available upon request.

Modular design for flexible and easy field conversion from Fail Close CW to Fail Open CCW configuration or vice versa

On-site maintenance without need of special tools

Rapid emergency response in less than 0.5 seconds achieved through optimized design. The LPC is designed with emphasis on ever-increasing requirements for fast response time. The result is the smallest possible displacement volume for given torque outputs, resulting in the fastest possible cylinder exhaust, making it ideal for emergency applications such as EDS and HIPPS.

 

Standard and Custom Controls

Limitorque offers a wide selection of standard and custom controls packages for most applications to fill customers’ needs for short lead-time, low-cost solutions:

Partial Stroke Test (PST)

Emergency shutdown (ESD)

High-integrity pressure protection systems (HIPPS)

Quick-closing

Modulating/control valve functionality

Quick exhaust valve with flow regulator for closed loop

Cylinder integral quick-exhaust valve

Pneumatic booster

3/2 and 5/2 pneumatic piloted valve with manual reset and override

Unidirectional and bidirectional flow regulator valves

Compact fittings to reduce pipe and controls dimensions

Lockout modules, manual overrides, other controls and accessories are available.

 

Certifications and Approvals

The LPC actuator is designed to meet industry standards and customer acceptance criteria that define today’s performance and safety requirements for pneumatic actuators. Critical certifications, approvals and standards to which the LPC has been tested are listed here.

Key Certifications and Standards Compliance:

Available according to ATEX 94/9/EC Ex II 2GD c IIC T6

NEMA 4 and NEMA 4X configurations, per NEMA 250

IP66/IP66M and IP67/IP67M configurations

Available valve interface in compliance with ISO 5211, with additional spool piece

Actuator spring design in compliance with EN 13906

Corrosion protection in compliance with ISO 12944-2 and EN 15714-3; optionally available up to and including C5-M corrosion category

Available in compliance with NACE specification MR0175 for sour gas applications

Available in compliance with PED 97/23/EC, ASME BPVC Sec. VIII Div. 1, EN 13445-3 Part 2 for Unfired Pressure Vessels

Manufactured and tested in compliance with ISO 9001 and EN 15714-3

For more information regarding product compliance with ATEX, PED, ASME, SIL and GOST, please contact Flowserve