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An actuator may be specified "fail open" or "fail close" to describe its behavior. In the case of an electric actuator, losing power will keep the valve stationary unless there is a backup power supply. A typical representative of the valves to be automated is a plug-type control valve.
In 2014 Rotork also acquired Xylem Flow Control Limited (XFC), based in Wolverhampton, UK, a leading manufacturer of solenoid valves and instruments under the Midland-ACS, Alcon Solenoid Valves and Landon Kingsway brands for £18 million. [18] At the beginning of 2015 Rotork acquired part of Omas Teknik, [19] its sales and service agent in Turkey.
An automatic control valve consists of three main parts in which each part exist in several types and designs: Valve actuator – which moves the valve's modulating element, such as ball or butterfly. Valve positioner – which ensures the valve has reached the desired degree of opening. This overcomes the problems of friction and wear.
The company develops, produces and markets actuators for controlling heating, ventilation and air conditioning systems. Actuators and control valves make up the company's core business, and it is considered a global leader in motor control for HVAC. [4] Newer products have integrated sensors and control electronics using ASICs.
Electrohydraulic servo valves may consist of one or more stages. A single-stage servo valve uses a torque motor to directly position a spool valve. Single-stage servo valves suffer from limitations in flow capability and stability due to torque motor power requirements.
Valves can be categorized also based on their function: Check valve or non-return valve, allows the fluid to pass in one direction only; Flow control valve, to maintain and control a variable flow rate through the valve; Poppet valve, commonly used in piston engines to regulate the fuel mixture intake and exhaust; Pressure-balanced valve