The scotch yoke actuators series ys yoke symmetric end yc yoke canted have been designed to act rotary valves up to 1. Bettis has included start, minimum, and end pressure torque outputs for your use. Scotchyoke actuators include a piston, connecting shaft, yoke, and rotary pin. The conversion of this linear force to torque for use in rotary valves is achieved by specific actuator designs. Scotch yoke actuator packages are available with a full line of accessories and options including position indicating switches, solenoids, supply pressure regulators, and positioners.
The actuator optimizes the center of gravity location to be lighter and more compact than other actuators of equal torque output lighter and 12 smaller. Flowserves competitive ductile cast iron pneumatic scotch yoke actuator for the chemical and general process industries, where product simplicity and robustness with reduced envelope dimensions are key. Cbbseries actuator represents the latest generation in pneumatic scotch yoke actuators from emerson. Rotex complete master drs, drv, drc, hyv, gov catalog. Drs scotch yoke actuator rotex infinity actuators are engineered to provide the longest possible service life. As for aircon scotch yoke pneumatic actuators, the double acting and spring return types are available on request. Scotch yoke actuator canted yoke actuator qtrco, inc. The bettis cbb line represents the latest generation of pneumatic scotchyoke actuators. Sy series scotch yoke actuators industrial valves and. The exclusive rotex vseal polymer double lip seal offers the most efficient, dynamic sealing in. The spring to be attached for the piston because it will return in initial position. The valves maximum torque requirements must be exceeded by the actuators torque output at all corresponding positions and directions of rotation.
We also offer desalination plant valves, sewage treatment valves. Scotch yoke actuators by 14 different bodies actreg. In case that air fails, the user will be able to open or close. The piston andor springs directly couple to a rotating yoke with a slot that engages the sliding blocks. A complete line of compact rotary electric actuators with a robust, ball bearing worm gear. The combination of scotch yoke actuators plus rack and pinion actuators offers the opportunity to standardize on one source for your complete quarterturn automation needs. For spring return scotch yoke actuators, air supplied at port 2 is released into the chamber and forces the piston towards the central module of the actuator, this compresses the spring in the opposite chamber and performs the counterclockwise rotational movement, opening the valve. Force arm scotch yoke actuator components air to and working principle a scotch yoke actuator may be defined as a mechanical device that converts linear force into torque to motorise quarterturn valves. The location of the piston versus time is simple harmonic motion, i. Bray series 98 pneumatic scotch yoke actuator operations and maintenance manual and fit the coupler shaft on the valve stem when using mounting kit. The twopiece cast housings provide protection and stability.
Compact, lightweight and ideally suited for automating ball, butterfly and nonlubricated plug valves, or any quarterturn 90 degree rotating mechanism, the cbxseries is. The scotch yoke also known as slotted link mechanism is a reciprocating motion mechanism, converting the linear motion of a slider into rotational motion, or vice versa. In the double acting actuator, one or two pneumatic cylinders are fitted to one or each sides and the actuator is operated by air pressure only. Incorporating cutting edge features provides the cbb with a proven, rugged design that is dependable and reliable in the field. The manual override is an important requirement for many valveactuator applications. Designed for use over a wide range of pressures and temperatures, our scotch yoke actuators are available in a number of different sizes, cylinder diameters and double acting or spring return configurations. Nsf25 and larger models equipped with four lifting eyes for safe actuator handling during shipping installation and removal. When the pneumatic actuator which mechanism convert rotary motion into linear motion. The cvs hydraulic actuator uses a scotch yoke mechanism to convert linear piston motion to a 90 degree rotation. Sy series scotch yoke actuators engineering creative solutions for fluid systems since 1901. Rugged and reliable unitorq scotch yoke actuators provide rugged reliability in the field.
Actuators this site powered by cymplicity with software provided by cms4i. Pneumatic actuator double acting pneumatic actuator. The actuators have been designed by using finite elements calculation methods, the bodies have very high stiffness. This mechanism converts linear motion into rotational motion. Scotchyoke, springreturn, fail clockwise actuators example assumes cw to close note. Bettis actuator sizing and selection emerson electric. Gseries offers multiple configurations, with a modular design that enables safe field maintenance and reduced inventory costs. This type of actuator has a distinct torque curve which starts high then dips toward the middle of the stroke and ends. Its modular design allows for easy field modification of the actuator. Scotchyoke valve actuators setting a valves full open.
The design, engineering and materials used in their construction ensure optimum performance even in the harshest environments. Modular design the pratt industrial sy series scotch yoke actuator has a highly efficient and interchangeable modular design air cylinder, power drive, spring pack, and override module providing for easy field. The thd series is designed to operate ball, butterfly, plug valves, dampers or any device that requires a quarterturn movement for onoff or throttling service. The remote control rci200 series actuator features a modern scotch yoke mechanism for high starting and ending torques in a very compact package. Scotch yoke actuators actuation valve and control ltd. Shd symmetric type and chd canted type heavy duty scotch yoke actuators are designed to perform in the most demanding applications. Product rtqh scotch yoke hydraulic actuator page content the rtqh series is a range of high torque hydraulic quarter turn actuators with materials selected to. The rcio series have adjustable stops in both directions for 5 sizes offering great flexibility. Morin uses either 174ph or ductile iron for this critical area as standard.
Ensure the actuators bore and seating face are clean and coat the valve stemadaptor with a suitable oilgrease. Modular design the pratt industrial sy series scotch yoke actuator has a highly efficient and interchangeable modular design air cylinder, power drive, spring pack, and. Duty scotch yoke actuator, series n1 the neles scotch yoke n1 series actuator is designed for use with quarter turn valves in both modulating control and onoff service. Thanks to the torque curve of this mechanism, this series is particularly suited to move ball or butterfly valves, both onoff and modulation ones. The scotch yoke mechanism is most commonly used in control valve actuators in highpressure oil and gas pipelines, as well as. They draw from the best features of earlier versions cb and cba and. This instruction manual contains important information regarding the actuatech scotchyoke pneumatic actuator operation, installation, maintenance and storage. The principle of the actuator application is to open and close the connected valve, without the manual operation with lever or hand wheel, by means of an electricpneumatic connection on remote control. With a 25year design life and a maintenance interval up to five years, the lpc limitorque pneumatic compact actuator is a complementary product to the available range of limitorque lps heavyduty pneumatic scotch yoke actuators. The instruction manual for sf series scotch yoke pneumatic actuators for all models of sy01f14, sy01f16, sy01f25, sy01f30, sy01f35, sy01f40, sy01f48. Scotch yoke actuators sy series model 7991, spring return actuators sy series model 7992, double acting actuators available options manual overrides the manual override is an important requirement for many valveactuator applications. Manual override handpump or declutch gear operator.
Scotch yoke actuators spring return double acting servitec. A using your minimum operating pressure, select an. In case that air fails, the user will be able to open or close the valve manually. Scotch yoke actuators unitorq actuators and controls. Scotch yoke actuators scotch yoke mechanism advantages the scotch yoke principle is characterised by high torque at the beginning and end of each operation. The manual override is an important requirement for many. The actuator incorporates key materials for construction, such as aluminum drive case, fiber. Scotch yoke actuators can also be configured with high pressure hydraulic. Limitorque pneumatic compact scotch yoke actuator model. Pdf design of scotch yoke mechanisms with improved. That provide great torque, so it used in some industrial valve. A complete line of scotch yoke heavyduty actuators provides torques from 3,000 to 500,000 inlb.
A via san lorenzo, 70 25069 villa carcina bs italy. Paladon systems pn and hyseries pneumatic and hydraulic scotchyoke valve actuators have been designed specifically to guarantee long cycle life in the most. Scotch yoke actuators are designed for use over a wide range of pressures or temperatures. Series 98 pneumatic scotch yoke actuator operation. Bettis cbxseries scotch yoke pneumatic actuator youtube. Series 98 pneumatic scotch yoke actuator operation and. The scotch yoke design is specifically designed to. This matches with the typical torque request of quarterturn valves and increases safety, especially in applications where a valve remains stationary throughout long periods.
The spring return actuator features a spring module with. Lpc limitorque pneumatic compact scotch yoke actuators. Scotch yoke part turn pneumatic actuator actuatech. Scotchyoke,doubleactingactuatorsexample assumescwtoclose note. In this video you will learn how to set the end stops on a springreturn failclose scotchyoke valve actuator. The heart of the series 98 actuator is the scotch yoke. The yoke construction creates high end of stroke torques for reliable use in tight shutoff. Scotch yoke is a mechanical system that allows to transform the linear force into a rotary torque. The cbb draws from the best features of earlier versions cb and cba. A unique slotted body concept absorbs 100% of the yoke mechanisms side loading forces leaving the piston rod completely free of bending stresses while allowing termination of the rod at the yoke, and the addition of a weight and force balancing second force module. Design of scotch yoke mechanisms with improved driving dynamics. The piston or other reciprocating part is directly coupled to a sliding yoke with a slot that engages a pin on the rotating part.
Shd symmetric type and chd canted type heavy duty scotch yoke actuators are. When using manual override sandwich gearbox, ensure the gearbox has over travel at least equal to that of the actuator. Standard design, scotch yoke guide bar design, scotch yoke morin series b and c actuators pentair reserves the right to change the contents without notice page 2 morin has a rugged heart morin scotch yoke the heart of any scotch yoke actuator is the yoke. A singleacting scotch yoke actuator is made of three main components. The valves torque requirements must be exceeded by the actuators torque output at all corresponding positions and directions of rotation. Fluitech,leader of drg scotch yoke pneumatic actuator.
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