Adjusting valve blockage prevention ( Card) The method of

Adjusting valve blockage prevention ( Card) Methods ( 6 kinds of methods) : 1. Cleaning, pipeline welding slag, rust, pulp are under the throttle mouth, guiding parts, valve cover balance hole blockage or stuck valve core surface, guide surface strain and scratches, seal surface indentation, etc. This often happens in the early new operation system and put into operation after overhaul. This is the most common fault. 2. External flushing method, for some easy to precipitate, medium containing solid particles using common valve adjustment, often at the throttle mouth jam, guide, can the valve cover bottom plug in an external erosion gas and steam. When the valve is blocked or jammed, opened the door of an external gas or steam valve, can be in the case of fixed valves to complete flushing work, make the normal operation of the valve. 3. Installation of pipeline filter method, the adjustment valve of small diameter, especially ultra-small flow regulating valve, the throttling clearance, small, medium can't have a little residue. Encounter this jam, had better install a filter in the valve pipe before, to ensure that the media to go through. With regulating valve positioner used, locator is not normal work, the pneumatic throttle mouth blockage is the most common fault. With locator at work, therefore, must deal with gas source, usually adopts the way is in front of the locator air filter and pressure relief valve installed on air line 4. Increase the throttle gap method, such as solid particles in the medium or washed off in pipe welding slag and rust due to pass the throttle mouth such as jam, jam, such as fault, can convert the throttle gap bigger throttle piece - Throttling area of a window, open the valve core and the sleeve, rather than the circumference of a circle because of the throttling area of concentration distribution, fault can easily be ruled out. If you are single, two-seat valves can change the plunger type valve core to 'V' shape of the mouth valve core, or into the sleeve valve, etc. Such as a chemical plant has a two-seat valves often gets stuck, recommend to switch to the sleeve valve, problem be solved immediately. 5. Dielectric flushing method, using the medium their energy flushing, flushing and take things easy to precipitate, easy to jam, thus improve the function of valve stem. Common methods include: (1) flow into closed type use; (2) in the valve body; (3) puts throttling mouth wash the worst place, using this method to pay attention to improve the throttling parts material erosion resistant ability. 6. Direct to the Angle, through to pour S flow, flow complex, upper and lower chamber should dead zone, provides the medium of precipitation. Angle connection, flows through 90 ℃ medium like elbow, washing performance is good, dead zone is small, easy, designed to streamline. Therefore, using the pass-through of slight adjustment valve jams can be used to Angle valve.