1, cleaning method: Welding Slag in the pipeline, rust, slag, etc. in the throttle, guide the position, under the valve cover balance hole caused by blocking or stuck to make the spool surface, the guide surface caused by pull and scratches and so on. In this case, must be removed for cleaning, remove slag, such as sealing surface damage should also be ground, at the same time plug opened to flush out from the balance hole into the bottom of the valve cover of the residue, and the pipeline for flushing.

Before the operation, let the control valve fully open, media flow for a period of time and then into the normal operation. 2, the media scouring method: the use of the media itself to scour the energy, scouring and taking away easy to precipitate, easily blocked things, thereby improving the valve blocking function.

Common methods are:

A to be used as a flow-closed type;

B using streamlined valve body;

C The throttle is placed at the top of the scour, the use of this method should pay attention to improve the erosion resistance of the throttle parts. 3, straight to the angle of the method: straight to the inverted-s flow, the flow of complex, upper and lower cavity die-zone, for the precipitation of the media to provide a place.

The angular connection, the medium like flows through 90 ℃ elbow, the scour performance is good, the dead zone is small, easy to design into streamline shape. 4, increase the throttle gap method: In the medium of solid particles or pipe in the erosion of solder slag and rust, etc. because the throttle mouth caused blockage, stuck, such as failure, can be used to throttle gap large throttle-throttle area for open window, opening type of spool, sleeve, because of its throttling area concentration rather than circumference distribution, the fault can easily be excluded.

If it is a single, two-seater valve can be a plunger-shaped valve core to the "V"-shaped valve spool, or to change into a sleeve valve. 5, external scouring method: for some easy to precipitate, containing solid particles of the medium used by ordinary valve adjustment, often in the throttle, the direction of blockage, can be in the bottom of the valve cover plug outside the flushing of gas and steam.

When the control valve is blocked or jammed, open the external gas or steam valve, you can complete the flushing work in the case of the fixed control valve, so that the valve normal operation. 6, the installation of pipe filter method: Small-caliber control valve, especially the ultra-low flow control valve, its throttle gap is very small, even if the medium has a little residue will plug, preferably in the valve before the pipe installed a filter to ensure the smooth passage of the media. With the regulator to use the control valve, the locator is not working properly, its gas channel choke is the most common fault.