This mainly refers to how the solenoid valve can better cooperate with the smart meter to improve the control precision and reliability of the system.
It is generally considered that the position adjustment is difficult to achieve high precision, but in many cases, the appropriate method can be used to achieve the required high precision, and the cost is greatly saved.
(1) Double combined electromagnetic wide.
This is a combination of solenoid valves of different sizes.
The fuel dispensers that are used in large quantities have a metering accuracy of up to 0.02%, and both use double solenoid valves. The large valve is opened, so that the refueling is nearly completed in a short time; then the large valve is closed, and the small valve is supplemented to ensure the flow accuracy. This technology has been applied abroad for many years, and its products are manufactured by ASCO Honeywell, a world-famous solenoid valve specialist. Now the company produces double solenoid valves that have reached the specifications of imported products, as well as unique performance.
By the way, it is pointed out that the measurement of large-scale flow of domestic oil depots is still introducing or replicating foreign multi-stage shut-off valves with complicated structure and unstable performance. This product is not made by world-famous professional companies because the market demand is not enough to attract them. interest. In fact, our oil depot uses a large-flow dual-combination valve produced domestically, and the effect will be much better.
Double combination valves are also commonly used to control parameters such as temperature, pressure, and liquid level. The large valve guarantees the basic amount and the small valve provides the compensation amount. In systems where the parameters are relatively stable, this positional control can be quite accurate. For systems with large parameter changes, the rate of change is still subject to certain constraints, such as temperature control systems, which are still affected by thermal inertia. Therefore, the properly used double combined valve can greatly reduce the cost relative to the regulating valve under the premise of meeting the control requirements.
(2) Three-position solenoid valve and digital valve
The valve core of the three-position solenoid valve has three working positions. It is normally not energized and is in the micro-start state. The valve provides the initial flow rate; for an electric signal, the solenoid valve is fully open to provide a large flow rate; for another electric signal, the valve is closed. . The valve also has a manual device that eliminates the need for power during long-term valve closing. The three-position solenoid valve can be regarded as a more compact double solenoid valve, which is convenient for three-position adjustment and has many applications.
A further idea is that n sizes of solenoid valves constitute 2n kinds of flow, similar to digital circuits, which are called digital valves. In fact, two different sizes of double or three-position valves can produce 24=16 or 32=9 flow rates, which can achieve very high precision. In principle, it has advantages with industrial computer, but because the application field has not yet put forward a lot of demand, this technology is still in the experimental stage.
(3) Self-holding electromagnetic wide
The self-retaining solenoid valve only needs to be energized to complete the valve switching action, and the position of the valve core is not required to be maintained. Its advantage lies in the energy saving, especially in the case of using the battery as the power source, and the temperature rise is not considered, so the coil has a long service life and high safety in high and low temperature, explosion-proof and the like. Commonly used are mechanical retention and permanent magnet retention, and are divided into double coils and single coils. The single coil magnetic retention structure is the simplest. It is to change the polarity of the DC power supply to change the two states of the corresponding valve switch. This kind of solenoid valve is equipped with a separate switch for the external wiring of the coil, and it is very convenient to be equipped with the smart meter. The IC card pre-charged gas meter and the electromagnetic valve equipped with the water meter are one of the keys to the success or failure of the meter. Among them, the self-holding technology is an important factor in the success or failure of the solenoid valve. The domestic self-holding electromagnetic has become increasingly mature, and the company has become more and more The home smart meter factory provides matching.
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