actuator
An actuator is a mechanical device used to control valves, dampers, etc.
　　pneumatic actuator
Pneumatic actuators can provide high stem power output under harsh working conditions. These actuators are typically operated by air pressure, but some can be operated by process liquids themselves.
　　Diaphragm actuator
The action mode of Fisher springs and diaphragm pneumatic actuators can be "positive action", that is, the air entering the diaphragm cover causes the actuator push rod to move downward. This' gas shut-off 'action compresses the spring, which in turn pushes the actuator push rod upwards again when the gas source pressure drops or disappears.
In addition, the action mode of spring and diaphragm pneumatic actuators can be "reaction", that is, the air entering the diaphragm cover causes the actuator push rod to move upward. This "air opening" action compresses the spring, which in turn causes the actuator push rod to move downward when the air source pressure drops. This is the most common type of diaphragm actuator, as the spring will cause the valve to be in the "fault automatic closing" position when the air source disappears.
　　Fisher 656 Executive Agency
The Fischer 656 actuator is a bracket mounted, positively acting diaphragm actuator that can perform throttling or switching operations Fisher 656 product documentation, Fisher 656 product features and advantages, Fisher 656 product application specifications
　　Fisher 656 Executive Agency
The Fisher 656 actuator is a bracket mounted, positively acting diaphragm actuator that can perform throttling or switching operations. The main applications include the operation of butterfly valves and built-in turbine valves, louvers, dampers, and other similar equipment.
　　Characteristics and advantages
Universal installation - The actuator base has four screw holes for mounting brackets or plates.
Long stroke of actuator - The deep membrane cover uses an actuator with a size of 60, which can achieve a maximum stroke of up to 105 mm (4.125 inches).
Diversified applications - The spring selection range is wide and almost applicable to any control application. The spring selection program is fast and accurate.
Severe operating conditions - sturdy brackets and membrane covers provide stability and corrosion protection.
　　Regarding the Fisher brand
Emerson Fisher valves provide time tested innovative solutions that can help customers reduce equipment maintenance costs, lower capital requirements, reduce compliance costs, and improve process availability.
This will be achieved through world-class products, including Fisher positioners, Fisher regulators, Fisher control valves, Fisher valves, Fisher regulators, Fisher pressure reducing valves, Fisher control valves, Fisher instruments, and performance services, all of which are the most reliable products in the process control industry.
　Fisher Company Introduction
Fischer Control Equipment International Limited was founded in 1880. At that time, in Marshalltown, Iowa, USA, our founder William Fisher invented the first pump regulator and planted Fisher's seeds in the small town. Since then, Fisher has achieved tremendous development through years of hard work and has become a recognized brand.
Emerson purchased Fischer in 1992 and merged with another world leader in the process instrumentation field, Rosemount, to establish Fischer Rosemount to better meet our customers' requirements for a complete range of applications and process control. In April 2001, Fischer Rosemount was renamed Emerson Process Management.
　　Fischer's business scope
The industries served include: petroleum and gas, paper and pulp, oil refining, food and beverage, chemical and petrochemical, pharmaceuticals, electricity, metals and smelting, semiconductors; The product and service scope includes: control valves and actuators, digital valve controllers, digital level controllers, AMS ValveLink software, field installed instruments, quick replacement parts services, regulators, etc.