Views: 0 Author: Site Editor Publish Time: 2021-04-27 Origin: Site
Over the past decade, the fastest-growing type of electro-pneumatic regulator has been the servo valve design, which uses two high-speed servos or solenoid valves to increase or decrease air pressure as needed to maintain pressure. These high pressure electro-pneumatic regulators offer higher pressure, greater flexibility and durability than previous technologies previously marketed as electric-gas sensors. electro-pneumatic regulators are the main force of American industrial automation from the 1950s to the 1990s. New high pressure electro-pneumatic regulators (also known as electronic pressure controllers), with greater accuracy and precision, have captured the majority of the market for these E/P sensors. This page aims to explain how the original electropneumatic sensor worked.
Here is the content list:
l About electronic pneumatic regulators
l How does the high pressure electro-pneumatic regulator work
l Circuit electronic pressure regulator
These devices convert current or voltage into pressure. They work by creating a force imbalance on the pilot diaphragm through a wire's electromagnetic coil (similar to a loudspeaker coil). Other than coils, there is no electronic function to control the pressure output. The device can be used as a simple mechanical force balancer with adjustable spring offset at zero and span. These devices typically include a second stage flow lift that uses a force balancing diaphragm and seat to produce higher flow at the outlet than a smaller first stage valve may. If properly maintained and often calibrated, these devices will work well. Indeed, these devices were the basis of the golden age of pneumatic control after World War II, which activated countless control valves and cylinders in factories around the world.
The servo electronic pressure regulator (EPR) works by using a push valve and an exhaust valve to maintain the outlet pressure at the desired set point. A small internal pressure sensor monitors the output pressure and a digital or analog controller adjusts the timing of the servo valve to maintain the set point. These EPRs typically require a DC power supply and a set point signal. Analog controllers usually accept current or voltage input. In addition to the common analog standards, models with digital circuits can accept serial communication. Most models also provide a feedback signal to inform the value of the pressure sensor. There are several key parameters to the successful application of this technology. The holes in these valves are available in several sizes and should be matched to the required flow rate. The volume of the gas space can affect valve regulation.
What is available to most EPR is loop control, which uses external feedback signals. This is useful in cases where the pressure must be maintained in a position removed from the EPR position or where the customer's pressure transmitter is of higher quality than the pressure transmitter provided in the EPR. These devices typically continue to refer to the internal pressure sensor for valve timing but bias the signal from the internal pressure signal as needed to match the external feedback signal with the command (setpoint) signal. An external pressure transmitter is directly connected to the process and provides feedback to the controller. Interestingly, these devices can be used to control for phenomena other than pressure. For example, the motion of a linear cylinder can be controlled by sending a linear displacement feedback signal to the EPR. The controller will adjust the output pressure as needed so that the displacement feedback signal matches the setpoint signal.
NNT has always attached great importance to the quality of its electronic adjustable pneumatic regulator. It has the most advanced production and testing equipment in the industry, and strictly controls all aspects of quality management to ensure that every NNT product delivered from the factory meets the highest quality standards.