Category: BIFFI

Stainless steel spring return and double acting pneumatic quarter-turn actuators Output torques to 13545 Nm

GENERAL APPLICATIONS

For remote control of any quarter-turn application: ball, butterfly, rotary plug or damper style valves, etc. To be used in chemical process, food and beverage, iron and steel, off-shore marine, pharmaceutical, power, oil and gas, pulp and paper, and textile industries.

FEATURES AND BENEFITS

 • Innovative stainless steel construction provides superior internal and external corrosion resistance.

 • Scotch yoke design using precision bearings eliminates dead band in the yoke mechanism, providing the greatest torque output at the beginning and dcs-sis.com end of stroke.

 • High strength 17-4PH stainless output shaft transmits torque and gives long service life.

 • Heat-treated stainless steel thrust pin and rollers transfer piston force to yoke to reduce friction for longer life and more efficient torque transmission.

 • Bi-directional travel stops provide accurate valve rotation adjustment.

 • PTFE piston bearings, piston rod bushings and output shaft bushings provide longer life, reduce maintenance and require no lubrication.

 • Universal design position indicator and pointer allows for either parallel or perpendicular mounting.

 • Stainless steel construction allows proximity switches to be direct-mounted in the actuator housing, eliminating the need to mount bracket and cam assemblies on top.

 • NAMUR drive slot maintains a compact assembly for accessory-driven components with no couplings necessary.

 • Available in symmetrical and canted yoke design to suit application.

 • Spring return model design requires no special tools to disarm springs safely and easily, reducing down time.

Actuator Description

The RPS actuator features a pneumatic low pressure spring return and is suitable for any angular stroke rotary application such as shutting off and regulating ball, plug, butterfly or vibration dampened valves in heavy duty service. 

The actuator consists of a rack and pinion mechanism that drives the linear motion of the pneumatic cylinder in one direction and converts the linear motion of the spring into rotary motion for valve operation in the opposite direction. An adjustable bronze slide supports the lateral force applied to the rack by engaging with the pinion gear. The rack is nitrided to ensure minimum friction. 

The spring module contains one spring or two springs in series depending on the model and is fully encapsulated, which ensures personnel safety and easy assembly. External travel limit bolts allow precise angular travel adjustment between 80° and 100°.

The fully enclosed protective housing is made of ductile iron for maximum strength and is suitable for use in harsh environments.

The mounting flanges are identical on both (top and bottom) sides of the housing; the shaft output actuators have the same dimensions but are positioned at 90°. This allows the actuator to be used as a closing or opening spring without modification.

The actuator is assembled to the valve by connecting the actuator housing flange to the valve flange with a sleeve and, using the stem extension shaft, connecting the actuator shaft bore to the stem.

Rotate the jacking bolt with a hand lever or handwheel (available on request) to perform a manual emergency operation of the actuator in opposition to the spring action. 

The mounting flange on the top of the housing can be used to assemble limit switches, position sensors, positioners, etc. driven by the actuator output shaft.

Get top quality products, entirely engineered and manufactured in Italy. In-house and fully integrated design, manufacturing and testing facilities, guarantee the highest quality standards of every Biffi product, which is individually torque and performance tested to maximize its reliability and durability.

There is one best actuation solution for your plant, and we support you in realizing it

Designed around your plant’s requirements

Understanding and solving Customer’s problems, protecting plant assets, personnel and the environment with smarter, safer and more efficient operation is our top priority.

Our team of actuation experts with a unique cross-functional expertise in valve automation, safety applications, process control and digital communications, aims at being a global partner, to effectively support every Customer throughout the whole selection and decisionmaking process.

Rely on us, anytime and anywhere

Biffi’s Lifecycle Services Program allows your plant to operate safely, consistently and

economically, improving your asset reliability and preserving your investment.

Our dedicated Lifecycle Services network covers all geographical areas, ensuring quick and professional support, including site walkdown and asset review, installation,commissioning, maintenance, troubleshooting and repair, STO (Shutdown, Turnaround, Outage) support, upgrade, replacement, retrofit and spare parts management.

Furthermore, the Biffi School of Actuation supports Customers to optimize their plant

performance through dedicated training sessions for site people.

Rely on sophisticated technology content

SIL capable products (IEC-61508 1-7:2010 SIL 2&3) provide exceptional performance in the most extreme operating conditions. Smart control and networking devices improve the actuator capabilities with a wide range of bus communication protocols, position feedback, PST capabilities and more.