The kinds of electromagnetic valve and installation

by:AIRWOLF     2020-05-17
Trace the history of electromagnetic valve, electromagnetic valve at home and abroad so far, in principle can be divided into three categories: ( Namely: straight acting, with pilot operated step by step, and from the valve disc structure and material of different and the difference on the principle is divided into six branches small class ( Diaphragm structure, step by step of moving heavy piece of membrane structure, the structure, the forerunner in straight moving piston structure, step by step piston structure, the forerunner of moving piston structure) 。 Direct acting solenoid valve principle: electricity, electromagnetic coil to produce electromagnetic force to shut down from the valve seat, valve door open; Spring power, the electromagnetic force disappears, the closure pressure to the valve seat, valve door closed. Features: in a vacuum, negative pressure, can work properly when the zero pressure, but size is generally not more than 25 mm. Distribution principle of direct acting solenoid valve: it is a direct acting and pilot operated the principle of combining, when the inlet and outlet no pressure difference, after electrify, electromagnetic force directly to combine small pilot valve and main valve closure in lift, the valve door open. When the inlet and outlet at startup pressure difference, after electrify, the electromagnetic pilot valve, main valve inferior vena pressure rising, the cavity pressure drop, the main valve is opened up by using pressure difference; Power cuts, pilot valve using the spring force or medium pressure push off, move down, to close the valve gate. Features: on the zero differential pressure or vacuum and high pressure, to * action, but power is larger, requirements must be installed level. Principle guiding type electromagnetic valve: when electricity, electromagnetic force open the pilot hole, the chamber pressure drops rapidly, in closed form around the high low differential pressure, fluid pressure push close up, valve door open; Power off, the spring force to close the guide hole, inlet pressure chamber through the by pass hole quickly in the closed valve using a form around high differential pressure, fluid pressure push close move down, close the valve gate. Features: high fluid pressure range limit, can be arbitrary installation ( Need to customize) But fluid differential pressure conditions must be met. Electromagnetic valve installation and maintenance of read product manual carefully before installation, check whether products conform to the requirements of the use, remember to install the point, ready to work. Proofreading nameplate by standard parameters and the parameters of the selected products are consistent, the power supply voltage should be meet the rated voltage range: + 10% ~ - Dc + 10% ~ 15%, - 10%, coil components should not be open at ordinary times. Before taking over with 0. 3 mpa pressure pipe flushing, the metal powder in the pipeline and the sealing material residues, scale and rust removal, etc. Pay attention to the cleanliness of medium, if within the medium mixed with dirt and impurities, such as not impair the normal work of the electromagnetic valve, pipe valves should be installed in the filter mesh & ge; 60 mesh. Electromagnetic valve should not be installed in the pipeline dips, installed in the discharge pipe of container, pay attention to not from the bottom of the container to elicit, and should be installed at the bottom of the container is a bit position. If water hammer will be the media, should choose the electromagnetic valve with the function of water hammer or take appropriate preventive measures. Steam inlet side with electromagnetic valve should be equipped with a drain valve, take over should be tilted, the electromagnetic valve is generally directed, not backward, typically on the valve body with & other; → ” Points out that the medium flow direction, to in accordance with the installation & other; → ” Indicate the direction of the installation but the company may sometimes in the vacuum tube road or special circumstances have proposed an exception. Installation position: general electromagnetic solenoid valve parts should be vertical, the vertical installed in a horizontal pipe at the ground, if the space restrictions or conditions required by the side, like the building sewer pipe or inverted installation, please put forward in the selection of orders. Some products have special rules, please follow the instructions to install. Control of attention when sealing material do not use too much. Such as threaded connection, to take over the thread should be kept within the effective length, and in the end half pitch with file chamfering, since end 2 tooth starting winding sealing strip, or excessive seal belt or binder will go into the inner cavity of the electromagnetic valve, and interfere with the normal movement of accident. Electromagnetic valve installation area should have a certain room, so that the daily maintenance and regular maintenance. When installed using a wrench or pliers fixed valve body, turn over again, never will force in the electromagnetic coil components caused by the deformation, the electromagnetic valve is difficult to work properly. In pipeline insufficient rigidity, or under the condition of water hammer, the valve before and after taking over with bracket, please. In the frozen place when using, must pipe protected with insulating material or set the heater in the line. To confirm, electromagnetic valve itself and it if there is a leak and take over the joint. To coil lead wire connection to check, especially the three lead. Connection to the electromagnetic valve electrical components, such as relay, contactor and on off. Contact should not be vibration, open the valve, otherwise it will not work reliably, and affect the electromagnetic valve life. Line of the electric circuits to access the corresponding insurance, as the electric circuits of the protection.
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