hytork excel (xl) rack and pinion pneumatic valve actuator

The Hytork Excel (XL) Rack and Pinion Pneumatic Valve Actuator is a high-performance, precision-engineered actuator designed to provide reliable and efficient automation of quarter-turn valves, including ball, butterfly, and plug valves. Manufactured by Emerson, the Hytork XL Series delivers consistent torque, superior corrosion resistance, and long-term reliability for use in the most demanding industrial environments. The actuator’s rack and pinion mechanism ensures smooth, balanced torque output throughout the full stroke, minimizing side loading on valve stems and extending service life. Its modular design allows easy conversion between double-acting and spring-return (fail-safe) configurations, offering flexibility for various control and safety requirements. Constructed from hard anodized aluminum with epoxy-coated end caps, the Hytork Excel XL actuator provides excellent protection against corrosion and harsh operating conditions such as offshore platforms, refineries, chemical plants, and power generation facilities. Designed for easy integration, the XL Series features NAMUR and ISO 5211 mounting interfaces, enabling direct mounting of solenoid valves, positioners, and other accessories without the need for additional brackets. Its precision-machined components and low-friction seals deliver outstanding performance, low air consumption, and minimal maintenance needs over its operational lifetime.

Technical Specification of hytork excel (xl) rack and pinion pneumatic valve actuator

Power Source

Pneumatic

Product Type

Pneumatic Rack and Pinion Actuator

Actuation

Quarter-turn

Certifications

ROHS3, REACH, ATEX, PED and Machinery Directives, SIL3 IP66/67

Control Type

On/Off, Positioning, Modulating, ESD

Valve Type

Ball, butterfly, plug and any other quarter turn application

Operating Temperature

Standard -20°C to +100°C (-4°F to +212°F). Optional high and low temperature options

Torque

12 sizes; 19 to 3232 Nm (167 to 28500 lbf.in)

Operating Pressure

up to 8.3 bar / 120 psi

Feature of hytork excel (xl) rack and pinion pneumatic valve actuator

• Hytork XL comes with a unitque SAFEKEY system (patented) and uses a flexible stainless steel key in an internal machined keyway. SAFEKEY prevents external contamination and eliminates stress concentrations caused by point loading.
• Actuator internals are protected for corrosion with CEREMIGARD a ceramic-like finish of Di-Aluminium Tri-oxide (Al2O3).
• A powder-coated surface treatment as standard on end caps and housing provides extra protection against aggressive environments.
• All moving parts are protected by permanently lubricated and long-lasting DURASTRIP bearings to reduce friction and increases cycle life.
• Plated with cobalt zinc, the steel pinion is protected from corrosion and features a unique stop design.
• NAMUR mounting (VDE/VDI 3845) allows standardization of mounting hardware for a wide range of accessories.
• Hytork XL actuator pinion drives are manufactured to ISO 5211 with a star drive to provide extra flexibility and simplicity for direct mounting to a valve.
• Large internal air passages maximizes valve operating speeds and adds reliability by reducing potential blockage.
• The visual position indicator is designed for indication at a glance and can easily be converted from across-line to in-line indication.
• The bi-directional travel stops allow easy setting of the valve stroke which prevents premature valve failures.
• Extra large rack and pinion tooth design promotes full tooth engagement. Assists gear tooth life by reducing stress and having precise gear tooth mesh.
• XL Springs are designed and manufactured never to break. The nested design provides a balanced concentric force on the pistons.