The second issue that has to be faced involves the need for DC power, which is required by the local electronics such as the servo-proportional amplifier. The proximity of the electronic module to the valve allows delicate wiring and cabling to be safely tucked within rigid, covered enclosures, in addition to decreasing conductor length.
Effects of severe environments may also be minimized by eliminating exposure Boiler feed pumps Manufacturers with the electronic circuit boards to like destructive conditions as mud, grime, dust, steam cleaning, chemical clean-up, or perhaps worse.
Field reports with circuit board structure and growing failures are rare, but inside severe vibratory applications, they accomplish occur. First, there is the issue of the place that the amplifier will be located.
This move has significantly reduced headaches with cabling plus wiring, which are the least reliable components—mostly because they are external and subject to help severe environments and physical mistreatment. As long as the valve coil reaches the low end of current requirements, (i.
This will call for designing for structural integrity, your vibration and environmental testing, last but not least qualification of the entire knock out subsystem. More of the electronic adjustments is possible at the factory, then established and locked, reducing the tuning required at application time. Most manufacturers have moved control electronics on the valve bodies of servo and also proportional valves.There are many issues for the designer to contemplate. e