Various types of electromagnetic valve and bead level gauge technology research
First, various types of solenoid valves, such as electromagnetic pressure valves, air valves, and stainless steel solenoid valves, are available in different configurations like two-way, three-way, and four-way valves. These valves can be used to control the flow of oil, water, and other fluids by opening or closing the passage. When paired with auxiliary contacts, they can automatically cut off the power supply to DC or AC solenoids, allowing precise control over the Valve position. The DKF-type stainless steel solenoid valve is designed for continuous operation, while most other models use a dual-coil, short-time power system. In long-term applications, two coils are used: one for actuation and another for maintaining the position, which helps reduce coil temperature without compromising suction performance. This design ensures high safety and extended service life. When using DC power, it's essential to connect the positive and negative terminals correctly, as specified in the diagram. Incorrect polarity can cause interference with the magnetic field of the contactor, leading to improper operation.
Second, the magnetic level gauge consists of two main components: the level gauge and the magnetic memory switch. The level gauge includes a float that moves within a connecting tube, and the magnet inside the float interacts with magnetic beads along the tube. As the float rises or falls with the liquid level, the beads follow it, reflecting the actual level in the container. The magnetic memory switch is mounted on the side of the connecting tube. When the float reaches a set point, the switch activates and retains its state even if the float moves away. Similarly, when the float descends to the lower limit, the next switch activates and remembers its position. Before installation, the contacts of the magnetic memory switch should be reset to ensure proper function, as they may become disordered during transport. To restore normal operation, a magnet can be placed near the upper and lower ends of the float to simulate full movement. Once this is done, wiring can proceed safely. The magnetic float is designed with an equal-pressure structure, making the level gauge suitable for high-pressure vessels. However, care must be taken to ensure that the vent pipe remains open and does not collapse, as this could affect the pressure balance. The level gauge, including the connecting tube and float, has already undergone hydrostatic testing at the factory, so no additional testing should be performed on-site to avoid damaging the float. If a pressure gauge is installed with a shut-off valve, the valve should be opened before pressurizing the vessel to prevent sudden pressure spikes that could damage the float. In systems where the level gauge is directly connected to a transmitter, it can output a standard 4-20 mA signal with a resolution of 7 mm, making it compatible with computer control systems.
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