Dry valveMaintenanceOver 20 years ago, i took down a thousand electric valves. From the first german-imported multiple-turned electric transmitters to the current national electric ball valves and electric butterfly valves, the common model has largely turned over. Many people use electric valves as black boxes and change them when they're bad, but most of the problems are clear, and the maintenance process is not so mysterious. Here's the whole process。
What about the power valve
The power outage is the headline, which cannot be saved. The three phase and zero lines on the main end of the electrical valve are to be removed before the battery is declared to be dead, and the circuit breaker is to be closed. When the factory was back, it had trouble bringing electricity down, and as a result it burned around the implementer and the tool touched the powered end。
Discrepancies the wiring box and marks the signal lines, the power lines, at one point. And then the top cap of the implementer, four of which have a hexagonal screw to the pine, and don't screw it. The lid can be lifted to see the electric power, the gear-reducing gear group, the limit cam wheel. Turn the output axle with your hand, and feel if it's stuck, the gear bites are tight, and the micro-moved switch on the cam wheel is not moving。
What's the most common thing about a power valve
After all this time, the power valve failed seven timesLimit switchAndOverload protectionBoth. The limit switch oxidizes, as the valve reaches its head, or the journey is several degrees different, rubs a few touches with an alcoholic cotton and fills with a little silver sour, most of which can be saved. The one in the overloader that melted alloy is broken, it's the one that's been blocked for a long time, and it's just a few bucks。
The other one is in the speedboxUmbrella gearsBeating. An electric valve is used for three or five years, the oil is old and seep oil, the gear is thinner, and the root of the parabolic gear is sharpened, with the passing of a broken tooth. Such gears can only be replaced by gears, which, for the most part, are standard, type by type, and range between a few dozen and $200. When it is removed, look in the direction of the parabolic gear, and reverses the output axis, the valves are turned, and there is no end in sight。
How do you fit a power valve
Reloading is a reverse order, but there are two areas that can easily turn over. One is that cam's angle must be aligned to the original position, before being removed, draw a line on the shell with a marker pen, and lock it tight when it's complete, or the valve opening signal is off, and the dcs displays an opening of 80% or 60%. The second is the o-seat cap, which is basically useless once removedWe have to change the circleA thin graphite is pressed back in, or six months later, the wiring box will seep, the contact point will be oxidized, and it will be in vain。
Finally, the air-borne test takes place three times to see if the current values are stable, to hear if there is any noise in the speed-reducing box, to connect the valves to the whole runway, and to limit the switch to the point where it's ready to go。
The maintenance of the electric valve looks at the steps, and it's okay to do it again. A set of commonly used tools, a few screws, two melting silks, most of the malfunctions are left unrepaired, and you can see them all。
