Common pneumatic valve products are pneumatic control valve, pneumatic butterfly valve seal hard seal, pneumatic seal flange valve, pneumatic flange multi-layer metal seal butterfly valve, reciprocating pneumatic diaphragm valve, CV3000 series of pneumatic valve products, including pneumatic Regulating valve is more important kind. Such products are inevitably used in the cause of blockage caused by improper maintenance, the following describes several preventive measures:

1) cleaning method

Pipe slag, rust, slag, etc. in the throttle, guide parts, under the valve cover to balance the hole caused by blockage or stuck so that the valve surface, the guide surface of the resulting injury and scratches and so on. In this case, you must uninstall the cleaning, remove the slag material, such as the sealing surface is also damaged should be ground; at the same time the bottom plug open to flush away from the balance hole into the valve cap slag material, and the pipeline Rinse. Put into operation before the valve is fully open, medium flow into the normal operation after a period of time.

2) external scouring method

For some easy to sediment, the medium containing solid particles using ordinary valve adjustment, often in the throttle, the guide block, can be flush at the bottom of the valve cover flushing gas and steam. When the control valve is clogged or stuck, open the external gas or steam valve, you can complete the flushing work in the case of the valve does not move, so that the valve normal operation.

3) Install the pipe filter method

The small-diameter control valve, especially the ultra-small flow control valve, the throttle clearance is very small, even if there is a little slag in the media will block, it is best to install a filter on the valve before the pipeline to ensure the smooth passage of media . Control valve with locator, locator is not working properly, the air passage choke plug is the most common failure.

4) Increase the throttle clearance method

Dielectric particles or pipes washed away by the welding slag and rust and other over the throttling caused by congestion, stuck and other failures, the throttle can be used to increase the gap large pieces - throttle area for the window , Openings of the spool, sleeve, because of its throttle area rather than the distribution of the circumference, the fault can be easily ruled out. If it is single, two-seater valve plunger can be changed to "V" -shaped spool, or into the sleeve valve.

5) medium scour method

Use of the medium itself scouring energy, erosion and easy to take away sedimentation, easy to block things, thereby enhancing the anti-blocking valve function. Common methods are: â‘  closed for the flow of closed-type use; â‘¡ using streamlined body; â‘¢ the throttle placed in the erosion of the most powerful, using this method should pay attention to improve the erosion-resistant parts of the ability to erosion.

6) straight to the angle method

Straight through to the inverted S flow, the flow path is complex, the upper and lower cavity dead zone, providing a place for the precipitation of the medium. Angular connection, like 90 ° elbow flow through the medium, erosion performance, small dead zone, easy to design streamlined.

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