2024-03-11
PROPORTION-AIR: Application of Electric Proportional Valve in Liquid Level Pressurization Control of Low Pressure Casting
Low-pressure casting refers to a casting method in which the liquid metal is forced into the mold by forming air pressure in a closed container to complete the filling and solidification process to obtain the casting..Its main process (liquid, filling, crust, pressure, pressure relief, etc.) is achieved by the pressure control system of the liquid level pressure control.Therefore, the liquid level pressure control system is the core of low pressure casting equipment. High-precision electricity-The gas proportional valve type has become the preferred actuator for low-pressure casting liquid level pressurization control systems.
United StatesPROPORTION-AIRThe company is a world-famous and professional high-precision electric-Gas proportional control comprehensive solution provider.
QB2/RG pressure control unit integrates air-Proportion closed-loop electro-pneumatic proportional valve, RG series flow amplification valve and external DS pressure sensor to form a complete pressure control unit. Using double closed loop electrical signal control pressure, the output pressure is proportional to the input electronic command. Fast response, reducing cycle time while ensuring accurate pressure control at high flow rates.
RG series high-precision flow amplification valve adopts diaphragm design, and controls pressure and displacement output through a force balance system. Even under the ultra-low pressure of 300-400mBar, the output flow rate can reach more than 1000L/min.
QB2/RG.Comparison of Electro-Gas Proportional Valve of Existing Liquid Level Pressurization Control System
Control Schematic Diagram of Existing Liquid Level Pressurization Control System
Existing electricity-Gas proportional valve system, the control principle of its liquid level pressurization control system is: the electric-gas proportional valve is used as the pilot control valve of the main control pressure regulating valve, the output pressure and flow rate of the electric-gas proportional valve are controlled by controlling the input electrical signal, and the output pressure and flow rate of the main control pressure regulating valve are indirectly controlled, and the feedback signal is fed back to the electric-gas proportional valve in real time through the feedback system to realize closed-loop control.
Control schematic diagram of QB2/RG liquid level pressurization control system
QB2/RG pressure control unit, the control principle of its liquid level pressure control system is: QB2 electro-gas proportional valve is used as the pilot control valve of RG flow amplification valve, and the output pressure of the electro-gas proportional valve is controlled by controlling the input electrical signal. At the same time, QB2The built-in pressure sensor can measure the output pressure and provide a feedback signal to the control circuit. By controlling the intake and exhaust actions, the difference in the signal is eliminated proportionally. formQB2 electric-gas proportional valve closed-loop pressure control.
QB2 output pressure as a pilot pressure control RG flow amplifier valve output pressure and flow,The output signal from the downstream pressure sensor is fed back toQB2 electro-pneumatic proportional valve,and compared with the input signal. If the downstream sensor output is lower than the input command, the intake valve opening proportionally eliminates the difference between the signal and the desired pressure. Form a dual-circuit closed-loop pressure control. The user can not only monitor the main control signal from the downstream, but also make the pressure reach the value.
| Existing liquid level pressurization control element |
QB2/RG pressure control unit |
| 1. Proportional valve open-loop products, diaphragm, spring, coil structure, low linearity; |
1. Proportional valve closed-loop control, built-in PID circuit, pressure sensor, solenoid valve, high precision/linearity; |
| 2, no built-in pressure sensor analog pressure signal output, can not effectively monitor and control processing. |
2. Built-in pressure sensor, can output analog pressure signal, real-time monitoring and control processing; |
| 3, the need for controller comparison operation, increase cycle time, reduce production efficiency; |
3. No need for controller comparison operation, reduce cycle time and improve production efficiency; |
| 4, external sensor to form a single closed loop control, high flow pressure control accuracy is low. |
4. Double closed loop electrical signal control pressure, high flow precise control pressure. |
QB2/RG technical parameters
QB2 technical parameters
| Intake pressure |
Vacuum-12bar |
Output pressure |
Vacuum-12bar |
| Flow |
34L/min@6.89bar |
Power supply voltage |
15 - 24VDC |
| Input command: voltage Current |
0 - 10V 4 - 20mA |
Analog Monitoring: Voltage Current |
0 - 10V 4 - 20mA |
RG technical parameters
| Maximum intake pressure |
17bar |
Output pressure |
0-10bar |
| Flow |
22648L/min @ inlet pressure 6.89bar, output pressure 1.38bar |
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Tianjin Liankesi Technology Development Co., Ltd.It's the United StatesPROPORTION-AIR's authorized agent in China is responsible for the sales, technical support and pre-sales and after-sales services of PROPORTION-AIR products in China. PROPORTION-AIR's electrical proportional valves, electrical servo valves, electrical converters, electrical proportional flow valves, electrical flow control systems, flow sensors, pressure sensors and other professional high-precision electrical proportional control products have been widely used in flow cytometry, Tire rubber, low-pressure casting, plastics and pipes, semiconductor equipment, spraying equipment, textile machinery and other industries.
Our company is a high-tech enterprise recognized by Tianjin municipal governmentIt has a professional R & D team and has obtained several national intellectual property certificates, and can provide integrated services of design, R & D, production and sales according to customer requirements. Over the years, adhering to the "quality-oriented, technology first, service leading" business philosophy, and has been determined to continue to innovate, improve the management system, and constantly enhance the competitiveness of products. Welcome friends from all walks of life to contact and cooperate to discuss!
Sales Hotline:15822721002 (Manager Zhang)
18698032466 (Manager Li)
Electrical, pressure, control, flow, output, proportional valve, qb2,rg, signal, pressurization
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