Proportional Pressure Regulator Working Principle
Our electronic proportional pressure regulator is a complete closed loop servo system consisting of two solenoid valves, an internal pressure transducer, and electronic controls. Based on analog signal, the pressure is controlled by two solenoid valves to maintain precise pressure; one valve functions as inlet control, the other as exhaust. The pressure output is measured by an internal or an external feedback pressure transducer that provides a feedback signal to the electronic controls. The regulator is suitable for industries that require precise pressure changes at any time and monitor pressure values.
Available with 3 selections of input signal: 0-10VDc, 4-20mA, or RS485 Modbus. Monitor signal can be chosen from 1-5V, 0-10V, or 4-20mA. Our special design offers high pressure and high flow capability electronic pressure regulator in uni-body design.
For applications that require high pneumatic flow rate, we offer the option of air pilot volume booster to amplify downstream flow.
For applications that require an external pressure transducer, there is also an option to link our pressure regulators to external sensors for closed loop control.
All our products have CE, SGS, RoHS certification with ISO13485 quality system. Applications: Laser cutting, leak tester, tension control, PET bottle molding machine, multi-stage pressure control… etc.
FAQ session – Proportional Pressure Regulator
1. What is the difference between Proportional Pressure Regulator, Electronic Pressure Regulator, Electro-Pneumatic Regulator, I/P Converter, and Digital Pressure Regulator?
They are the same products with different names.
2. Where is the digital pressure regulator used?
Laser cutting, plastic blow molding machine, tension control equipment, tire making machine...etc.
3. Is the pressure regulator resistant to dirt?
No, it is not resistant to dirt particle. Please use dry clean air and filter with < 5 µm.
4. Any restriction on mounting orientation?
There is no restriction on mounting orientation; however, please be aware to protect the regulator from environmental water drop, oil, and welding slag.
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How does a Proportional Pressure Regulator work?
A Proportional Pressure Regulator has many advantages over mechanical manual regulators. A manual regulator will maintain pressure downstream, most effectively with constant flow rates. However, upstream flow and pressure will often fluctuate in most applications. Pumps and compressors deliver pulses, and the pressure will fluctuate with demand. When a mechanical pressure regulator lacks accuracy or can’t respond fast enough, the result is uneven pressure output. This simple device might be good enough when accuracy isn’t as crucial. However, a digital pressure regulator delivers better accuracy and stable output pressure by utilizing a control signal and the feedback signal to create closed-loop pressure control.
What Electronic Pressure Regulator Do
Electronic pressure regulators maintain a constant output pressure within a pressurized system even if there are fluctuations in the incoming pressure to the regulator. Mechanical pressure regulators are typically only adjustable by hand, limiting their usability in digitalized process environment. When using an electronic pressure regulator with a digital control system, the precise output pressure is controllable via slight adjustments to the control signal. An internal pressure transducer creates a closed-loop control device and offers a feedback voltage of the current output pressure. By reading this feedback signal from an electronic regulator, control systems can make real-time adjustments, greatly improving consistent pressure regulation in the most demanding applications.
How Electronic Pressure Regulators Work
Electronic pressure regulators are a big improvement over manual regulators—they are fairly simple and very effective at allowing better control. They use a fill valve and a vent valve to maintain the outlet pressure at the desired set-point. A small inner pressure sensor monitors the output pressure and the digital controller adjusts the flow output of the internal valves to retain the required set-point (i.e. closed-loop control). That means that when you set the desired pressure, the regulator will maintain this pressure even with changing flow rates through the system. The internal pressure transducer gives immediate feedback to adjust the flow of either the fill or vent valve so the output pressure remains static.
When the control signal increases, the internal proportional valve activates, increasing pressure into an internal pilot chamber. When this happens, more of the inlet pressure passes through the proportional fill valve and into the pilot chamber. The pressure in the pilot chamber grows and causes the upper surface of the diaphragm to operate. Because of this, the air supply valve linked to the diaphragm opens, and a portion of the supply pressure becomes output pressure. This output pressure goes back to the control circuit using the pressure sensor. The fill valve will continue to slightly adjust until the output pressure is equivalent to the desired set-point of the control signal.
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