Electromotive process control valves
05 January 2016
Electromotive actuators can offer a variety of opportunities for process optimisation. Bürkert’s Type 3360/3361 electromotive seat valves are suited to use in applications with stringent requirements for control accuracy and process stability, as well as applications in which operation without a compressed air system is advantageous.
A big feature of the new product family is said to be its performance, which is comparable to that of pneumatic actuators. With a control speed of 6mm/sec and a closing time of less than four seconds the company has eliminated the traditional weak point of many electromotive process control valves, which have control speeds of only 0.1 - 3 mm/sec.
The Type 3360/3361 valves allow adjustment of the control speed to the requirements of a specific application, in addition to definition of the stroke and closing limits and soft approach of end positions. Unlike pneumatic, spring balanced actuators, the electromotive valves travel to the desired position virtually without delay and without overshooting and will remain stable regardless of the media pressure.
In the event of a power outage the safety position can be approached via an optional SAFEPOS energy storage pack. In addition, the possibility of emergency manual movement also exists.
The electromotive process control valves was designed for applications in which the use of compressed air is either not desirable or is not possible. Examples of such applications include large-area storage systems with long distances to the single valves, as well as systems for mobile, decentralised water treatment.
It can also offer benefits in applications with stringent requirements for control accuracy and speed, together with minimal dead time, such as in engine test rigs. Harsh environments are no problem for the robust body with protection type IP65 / IP67, which also features an easy-to-clean and closed design.
The new process control valves are available as an angle seat valve (Type 3360) and a globe valve (Type 3361) in diameters from DN15 to DN50. They can be used with gases, liquids and steam and are designed for media temperatures from -10°C to 185°C. The maximum operating pressure is 16 bar. The connection options are flange, sleeve, weld-on and clamp.
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