Attempts to prevent the valve often jammed or blocked (card) method (6 method)
(1) cleaning method
Pipe welding slag, rust, slag and so on in the throttle, steering parts, under the valve cover hole caused by blocked or stuck to the spool surface, surface-oriented production strain and scratches, sealing surface indentation. This often happens in the new operation system and put into operation after the initial repair. This is the most common faults. In such cases, must be opened for unloading clean, except dregs, such as a sealing surface damage should be grinding; at the same time, open the bottom plug, to flush from the balance under the valve cover hole fall into the slag material, and pipe for irrigation. Before operation, to adjust valve fully open, medium flow into the normal operation after period of time.
(2) external flushing method
For some easy to precipitate, solid particles of the medium containing the common valve adjustment, often plugged in the throttle, guide, can be connected with erosion of gas in Gaidi plug valve and steam. Generated when the valve is blocked or stuck, open the external gas or steam valve, control valve can be fixed in the case of washing work done, so that normal operation of the valve.
(3) the installation of pipe filter method
Small-caliber valve, especially ultra-small flow control valve, the throttle gap especially small, medium can not have a little bit of slag. In this case the plug, it is best to install a filter pipe in the valve before, in order to ensure the smooth passage of medium. The regulator used with locator, locator is not working properly, the gas orifice plug is the most common faults. Therefore, when working with a locator, you must handle the gas source, usually by the way is to install the air filter relief-pressure valve locator before the gas supply pipeline.
(4) increase the throttle gap method
Such as the medium of solid particles were washed out or pipe welding slag and rust caused by jam, jam fault for not throttle, can use the throttling gap large pieces - saving an area of open window, open class spool, sleeve, and the focus is not circumferential distribution because of the orifice area, fault can easily be excluded. If you are single, two-seat shaped piston spool valve can be changed to "the V" - shaped mouth, or into a sleeve valve. For example, a chemical plant often have a stuck valve seat, is recommended to use the sleeve valve, the problem is resolved immediately.
(5) medium erosion method
Using the medium energy self-scouring, erosion and sedimentation away easily, easy to plug things, to improve the attempts to prevent the valve function. Common methods include: ① for flow closed type; the streamlined body; the orifice in the most severe erosion, using this method should pay attention to improving throttling material erosion resistance.
(6) through to angular method
Through the inverted S flow, complex flow path, upper, lower chamber and dead, for the media to provide local precipitation. Angle connection, like streaming media over 90 ℃ bend, erosion of good performance, small dead zone, easily designed to streamline. Therefore, through the control valve plug can be changed into slight angle valve.
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