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Sewage pump regulating valve is often anti-blocking 6 ways
- Aug 22, 2018 -

1 cleaning method


The welding slag, rust, slag, etc. in the pipeline are blocked or jammed in the orifice, the guiding part and the balance hole of the lower bonnet, causing strain and scratches on the curved surface of the valve core, the guiding surface, and indentation on the sealing surface. Wait. This often happens in the early stages of the new commissioning system and after the overhaul. This is the most common failure.

In this case, it must be unloaded for cleaning, remove the slag, if the sealing surface is damaged, it should be ground; at the same time, the bottom plug is opened to wash off the slag falling into the lower bonnet from the balance hole, and the pipeline Rinse. Before commissioning, let the regulating valve open completely, and the medium will flow into the normal operation after a period of time.


2 external flushing method


When some media that are easy to precipitate and contain solid particles are adjusted by ordinary valves, they are often blocked at the throttle and guide, and the gas and steam can be flushed at the bottom of the lower bonnet.

When the valve is clogged or stuck, open the external gas or steam valve to complete the flushing operation without moving the regulating valve to make the valve operate normally.


3 installation pipeline filter method


For small-diameter regulating valves, especially ultra-small flow regulating valves, the throttle gap is very small, and there should be no slag in the medium.

In case of blockage, it is best to install a filter on the pipe in front of the valve to ensure the smooth passage of the media.

With the regulating valve used by the positioner, the positioner does not work properly, and the blockage of the air passage throttle is the most common fault.

Therefore, when working with the positioner, the air supply must be handled. The usual method is to install an air filter pressure reducing valve on the air supply line before the positioner.


4 increase the throttle gap method


If the solid particles in the medium or the slag and rust that are washed away in the pipeline cannot be blocked or jammed due to the throttle opening, the throttle with a large throttle gap can be used instead. Valves and sleeves of windows and openings can be easily eliminated because their throttle areas are concentrated rather than circumferentially distributed.

If it is a single or double seat valve, the plunger valve core can be changed to a "V" shaped valve core, or changed to a sleeve valve.

For example, if a chemical plant has a double seat valve that is often stuck, it is recommended to use the sleeve valve and the problem will be solved immediately.


5 medium flushing method


Using the scouring energy of the medium itself, it washes and removes things that are easy to precipitate and easily clog, thereby improving the anti-blocking function of the valve.

Common methods are:

Change to use as a closed type;

Adopting a streamlined valve body;

Place the orifice at the most scouring point. Use this method to pay attention to improve the erosion resistance of the material of the throttle.


6 straight through the angle method


The straight-through flow is inverted S, the flow path is complicated, and there are many dead zones in the upper and lower chambers, which provide a place for the precipitation of the medium. The angular connection, the medium is like flowing through the 90 °C elbow, the scouring performance is good, the dead zone is small, and it is easy to design into a streamline shape. Therefore, the use of a straight-through regulating valve can be changed to an angle valve when it is slightly blocked.