Introduction Urban water supply pipe network is a complex and huge pipeline network system, which is the city's survival blood. In recent years, with the advancement of technology and investment in reconstruction, most water supply enterprises have set up water supply data monitoring and control systems (SCADA), monitoring of water supply and raw water delivery systems, monitoring of water purification structures and process equipment, and manometry of water supply network Function, but the valve opening and closing must also rely on the operator to the scene to complete manually. The pipe network valve is an important facility in the water supply system and plays an important role in regulating, regulating and controlling the water flow, pressure and flow direction in the water supply system. It is an important guarantee measure for unblocking the water supply system and repairing, maintaining and rebuilding the pipe network . Therefore, as an important pipe network equipment, how to better manage the pipe network construction and operation management is more and more important. 1, water supply pipe network monitoring system Water supply pipe network monitoring system is usually composed of four parts (shown in Figure 1): pipe network parameter measurement, intelligent valve control system, pipe network monitoring center, valve electric actuator. The principle is the remote collection of data through the sensor network pipe system operation, the signal via wired or wireless way to pass to the enterprise network control center and valve intelligent control system, the valve intelligent control system based on timely feedback to the monitoring data sent to control the electric Actuator valve adjustment. One valve control system is the core of control. 2, pipe network parameter measurement Water pipe network monitoring points generally require measurement of pressure, flow, velocity, flow of four-way data. Therefore, the scene need to configure the pressure, flow, flow rate, flow transmitter, and then wired or wireless way to send the parameter signal to the valve intelligent control terminal or pipe network monitoring center. The main pipeline should be segmented measurement, as shown in Figure 2. The valve V1 parameter monitoring module is located in front of the valve V2 and the valve V2 parameter monitoring module is located in front of the valve V3. And so on, so parameter monitoring module can accurately the main pipeline L1, L2, ... section of the parameters, feedback to the valve intelligent control systems and pipe network monitoring center. 3, the valve intelligent control system Intelligent valve control system can be passed independently to the pipe network parameters signal processing, according to the results of the treatment issued to the valve actuator implementation of the signal, you can also upload parameters to the network monitoring center. Valve intelligent control system by the computer system, single-chip microcomputer system, PLC system to achieve. In this paper, the microcontroller as the control center and gives a measurement point for the design. 3.1 Hardware Design Valve intelligent control system includes the main controller CPU, A / D, D / A, 8255A, 6264SRAM, key input circuit, LED display circuit, alarm circuit, clock and reset circuit, the structure shown in Figure 3 Show. System with AT89C52 microcontroller as the core, with the corresponding sensor will detect the pressure, flow, flow rate, the flow of data processed by the transmitter after four, converted to 0 ~ 5 V standard signal to send ADC0809 chip A / D conversion, The microcontroller is sampled once every 500 ms, median filtered after five samples, and the actual value (amount of the project) of each parameter is displayed on the LED after data conversion, and the information is sent to the network monitoring center. At the same time, the measured value is compared with the given value. According to the comparison result, the control signal is output after the control signal is output by the D / A converter and the valve actuator is driven to realize the automatic adjustment of the valve. In order to increase the flexibility of the system, a 4 × 4 matrix keyboard has been designed. Press the "C" key to display the flow rate; press the "D" key to display the flow direction; press the "E" key to display the pressure; press the "B" key to display the flow rate; "Key, cancel the alarm; press" F "key, put the alarm. 3.2 Software Design System applications by the main program and interrupt service routine composed of two parts. 3.2.1 The main program The main program block diagram shown in Figure 4. Include three main links: First, to achieve a variety of initialization, including setting the stack pointer, 8255A chip initialization, timer / counter 0 initialization, and open interrupts, timer / counter start. The second is to achieve the display (in accordance with the human-machine dialogue shows a variety of different parameters). Third, continue to scan the keyboard to determine whether there is a key press, if no key press, then return to display; if the key is pressed, according to the keys to achieve the appropriate man-machine dialogue. 3.2.2 Interrupt service routine interrupt service routine includes sampling, data processing, alarm, control algorithm and control value output and other links, are called subroutine to achieve, the block diagram shown in Figure 5. 4, pipe network monitoring center Network monitoring center information processing system can be achieved by the computer system. Through the different network interfaces such as RS 422 / RS 485 / Lonworks, the valve terminal is connected to the network. Pipeline monitoring center according to the passed parameters of the pipe network, through the background monitoring software enables data logging, analysis and processing in the control center of the real-time display of pipe network running status and a variety of required data, and provide solution. If the data is abnormal, you can send a warning alert to the staff. Pipe network monitoring center on the valve electric actuator control over the valve intelligent control system. 5, the valve electric actuator valve actuator in the valve Solenoid Valve. Solenoid valves are electromagnetic controlled industrial equipment used in industrial control systems to adjust the direction, flow, speed and other parameters of the media. Solenoid valve has a closed cavity, opened in different positions through holes, each hole leads to a different tubing, the middle of the valve is the valve, the two sides are two electromagnets, which side of the magnet coil body will be energized Which side to attract? By controlling the movement of the valve body to block or leak different oil drain holes, and then through the pressure of oil to push the oil just piston, the piston and the piston rod, the piston rod moves the mechanical device. This controls the mechanical movement by controlling the electromagnet current. In addition, the valve needs to be equipped with a manually adjusted handle to manually adjust the valve when the system fails. 6. Conclusion The main purpose of urban water supply network detection and intelligent valve control system is to solve the data acquisition, monitoring and automatic control of the valve switch of water supply company at various monitoring points in water supply pipelines. It is convenient for timely and promptly understanding and controlling pipes and valves, reducing the failure rate and maintenance time, reducing the number of water stops and improving the service level of water supply enterprises, thus realizing the urbanized water supply information and modernization.
Normally open air valves are a type of solenoid valve that is designed to remain open in its default state, allowing air or gas to flow through the valve at all times. These mini air valves are commonly used in a variety of applications where a constant flow of air or gas is required, such as in pneumatic systems and gas pipelines.
The primary function of a normally open air valve is to provide a continuous flow of air or gas through a system, which can help to maintain consistent pressure levels and prevent the buildup of excess pressure or vacuum. These valves are typically operated by a solenoid or other type of electrical control, which can be used to open or close the valve as needed.
There are several different types of normally open air valves available, each of which is designed to meet specific application requirements. Overall, normally open air valves are an essential component in many industrial and commercial systems, providing a reliable and efficient means of controlling the flow of air or gas through a system.
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