Traditionally electric valve actuators could not be considered to replace pneumatic valve actuators where the fast opening and closing speeds that are standard in pneumatic actuators were required, resulting in the expense of installing an air compressor, air pipework, driers and filters to drive the air actuators. With far fewer moving parts air actuators can comfortably be used in applications where a high number of cycles are required, another ‘Achilles heel’ of electric valve actuators as the relevant European norm limits the performance of part-turn on-off electric actuators to just 10,000 cycles.
Some new smart electric valve actuators are now able to operate at speeds under 1 second making them contenders to replace costly compressed air systems and offering customers a real lifetime cost advantage. One application for fast-acting electric actuators is in filling systems, traditionally a stronghold of the pneumatic actuator.
J4CS recently tested an AVA S20 fast acting on-off smart actuator fitted to a 1” stainless steel ball valve from Actuated Valve Supplies in the UK and can report that the actuator operated the electric ball valve in 1 second effortlessly and faultlessly over a test of 30,000 cycles. It is clear from our test that the build quality of the AVA is high to withstand our test and we would not be surprised that the claim from the manufacturers’ UK agent that they have fast acting AVA modulating actuators in an application that have exceeded 6 million movements is true.
Modern manufacturing techniques have enabled the consistent production of highly accurate components which when assembled under quality-controlled conditions, produce products with a high build quality that result in accurate and reliable performance in service, and offer a long service life. Following our tests, our opinion is that the AVA electric actuator is an excellent example of the use of modern manufacturing techniques with an obvious and deep understanding of the benefits of strict attention to all aspects of quality control.