Cleaning method
The welding slag, rust, slag, etc. in the pipeline cause blockage or jamming in the throttle orifice, guide part, and the lower bonnet balance hole, causing the valve core surface and guide surface to be scratched and scratched, and the seal surface is indented. Wait. This often happens during the initial period after the new commissioning system and overhaul. This is the most common fault. In this case, it must be unloaded for cleaning. Dross is removed. If the sealing surface is damaged, it should be ground. At the same time, the bottom plug must be opened to flush the slag falling from the balance hole into the lower bonnet and the pipeline. Rinse. Before putting it into operation, let the fluoridation control valve be fully opened and the medium flow for a period of time before entering normal operation.
External flushing
For some easy-to-precipitate, solid-particle containing media using ordinary valve adjustment, often blocked in the throttle, guide, can be attached to the bottom of the bottom valve cover flushing gas and steam. When the valve is blocked or stuck, open the external gas or steam valve, you can complete the flushing work in the case of immobile fluorine control valve, so that the valve can run normally.
Install pipe filter method
For the small-diameter fluoridation control valve, especially the ultra-small flow fluoridation control valve, the throttling clearance is very small, and the medium can not have a little slag. In the event of a blockage, it is advisable to install a filter on the valve front to ensure that the medium passes through. With the lining regulator valve used in the positioner, the positioner does not work properly, and the blockage of the gas path orifice is the most common failure. Therefore, when working with the positioner, the gas source must be handled. The usual method is to install the air filter pressure reducing valve on the gas line before the positioner.
Increased throttle gap method
If the solid granules in the medium or the slag and rust that have been washed out of the pipe, etc., cannot be blocked or stuck due to the throttle opening, the throttling device with a large throttling gap may be used. The throttling area is opened. Valves and sleeves of windows and openings, because their throttle area is concentrated rather than circumferentially distributed, can be easily eliminated. If it is a single or double seat valve, the plunger-shaped valve core can be changed to a "V"-shaped valve core or a sleeve valve. For example, a chemical plant has a double-seat valve that often jams. After the sleeve valve is recommended, the problem is immediately solved.
Media flushing
Using the media's own flushing energy, it can scour and carry away the easy-to-precipitate and easy-clogging things, thereby improving the anti-blocking function of the valve. Common methods are: 1 to change the flow closed type use; 2 the use of streamlined valve body; 3 the throttling mouth placed in the most powerful erosion, the use of this method should pay attention to improve the erosion resistance of the throttling material.
Straight through to angle method
Straight through to the inverted S flow, the flow path is complex, and the dead space of the upper and lower chambers provides a place for the sedimentation of the medium. Angle connection, the medium is like a 90° elbow, good erosion performance, small dead zone, easy to design into a streamlined shape. Therefore, the use of a straight-lined fluoridation control valve can be changed to an angle valve when it causes a slight blockage. - Sanjing Valve Technology Division
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