Table of Contents
What is an air torque actuator?
The Air Torque actuator is a pneumatic device for the remote operation of industrial valves. The actuator will operate through 90°,120°,135° and 180° rotation permitting the opening and closing of many types of valves up to 180° rotation.
How do you calculate pneumatic actuator torque?
1, τ = F × r, which can be used for the BTO torque created by the actuator. r is the movement distance of the rod due to air pressure. Assuming 16 mm for thickness of the rod end, the length of the air cylinder is 450 mm.
How do you choose an actuator torque?
From the actuator output torque tables select an actuator with an output torque greater than the Total Valve Torque Requirement. Pneumatic Actuators • Double Acting (Air-to-Air): Determine the air supply pressure available to the actuator and select the Actuator Size that exceeds the Total Valve Torque Requirement.
What is actuator break torque?
Break torque, or opening torque, refers to the force required to start moving a closed valve. Running torque, or mid-stroke torque, is the force required to maintain movement of the valve between the open and closed positions.
How is damper actuator torque calculated?
Torque Formula:
- Damper Area (Ft2) =
- Torque Factor ( )
- Required Torque (LbIn) = Damper Area (Ft2) * Torque Factor * Torque Factor ( )
What is valve torque?
Valve torque refers to the valve the required twisting force when the valve is opened or closed, which is one of the main parameters for choosing the valve driving actuator.
What is torque value?
Torque is a twisting force measuring force multiplied by distance – foot or inch pounds in the US and Newton-Metres in Europe. Usually distance would be the length of the wrench (say 2 feet) and your hand would apply force (2-foot wrench, 10 pounds of pressure equals 20 foot-pounds). [
What is the importance of the air pressure as it goes to the actuator?
Pneumatic actuators rely on some form of pressurized gas — most often compressed air — entering a chamber, where the gas builds up pressure. When it has built up enough pressure in contrast to the outside atmospheric pressure, it results in the controlled kinetic movement of a device such as a piston or gear.
How do you calculate valve torque?
Dynamic torque can be calculated from the formula Td = C (ΔP). Here, ΔP is the effective pressure drop across the valve at a given temperature and C is, once again, a constant.
What is actuator sizing?
An actuator can be sized for less than the minimum available supply pressure. This practice is usually done when actuators are oversized and the maximum torque of the actuator at the minimum supply pressure is exceeding the maximum allowable stem torque (MAST).
What is actuator torque?
Actuator torque is the quantity of torque that an actuator is capable of generating — a critical aspect of the rating specifications for any type of actuator. Torque ratings will determine the type of applications in which a specific actuator can be used.
How is the output torque of a spring return actuator calculated?
For spring return actuators the output torque is calculated by multiplying the force (air or springs acting on the pistons) with the lever arm. The output torque is generated by air supply pressure at port ‘2’ after compressing the springs, called ‘output torque air stroke’.
What is a torque rack and pinion actuator?
Air Torque Rack and Pinion Actuators are designed to handle most quarter turn valves. The units are designed from Aluminum and can be fitted either as a spring return or double acting.
How to choose the right actuator for your application?
The manufacturer will usually provide a specification sheet outlining different types of valves and the various torque values for the valves, such as breaking torque, closing torque, and running torque. An ideal actuator can then be chosen based on specific system characteristics, such as minimum and maximum supply pressure.