China Sealcon Company

Common Failure of Rotary Seal Valve

Liner card plugging:

Failure situation: the motor current transient of the rotary seal valve is too large to the protection shutdown. Transfer the field manual operation to a certain fixed angle, and we can hear the obvious metal impact sound and the valve body is accompanied by severe vibration.

Causes: the falling off of the wear-resistant and heat-resistant lining of the focus gate of the coke car, the coke dry quenching and the coke jar, the dry coke filling device and other parts. If the size is larger than the height of the blade of the rotary seal, it will be stuck between the blade and the inlet, causing the rotary seal valve to stop in a hurry. The failure is most common one.

Processing method: open the upper manhole of the rotary seal valve, remove the wear-resistant plate of the blocking plug, and restore the production after installing the manhole cover.

Coke and graphite block plugging:
Failure situation: the motor current of the rotating seal valve is too large to the protection shutdown, and there is a piercing friction sound when the field manual operation turn to a certain angle. It is very laborious or the car is not moving when we handle the car.

Causes: when coke and graphite block fill up the chamber, the coke or graphite block is squeezed and friction with the shell. When the friction force is greater than the torque of the rotary seal valve, it will cause the rotary seal valve not to move or difficult to move. The failure occurs mainly in the coke quenching capacity of the CDQ (it is larger than 80% of the design value) or when the rotary seal valve interlocks abrupt. When the rotary seal valve is interlocked rapidly because of other equipment malfunction, the rotary seal valve and the vibration feeder will stop simultaneously. The remaining tar in the vibration feeder falls to the rotary seal valve chamber.

Processing method: change the rotary seal valve from automatic control to manual control. Alternate the field manual operation and reversal operation, and rotate the upper grille of the material to the lower outlet part, so that the coke is emptied. If this method is still unable to make it rotate, we need to open the upper manhole of the rotary seal valve and pick up the blocking material.





Related News
  • Sealing Sense

    Sealing Sense

    November 29, 2017Thermal growth rate differences of head flanges, tube-sheets, bolts and gaskets create an upset of the gasket-flange interface and a loss of seating stress on the gasket that can cause flanges to leak...view
  • Classification Of Rubber Seal Ring

    Classification Of Rubber Seal Ring

    May 4, 2018There are all kinds of rubber seal rings in rubber seal factory. According to the ssutting shape, it can be divided as follows:O seal ring series (DSH seal series)It has many kinds of products, such a...view
  • Leakage Analysis And Maintenance Of Mechanical Seal

    Leakage Analysis And Maintenance Of Mechanical Seal

    May 4, 2018Leakage analysis and maintenance of mechanical seal1. Repair of mechanical sealMechanical seal flygt pump do not need special tools and materials for maintenance. Generally speaking, mechanical seals ...view
  • Common Problems In Mechanical Seal Pump

    Common Problems In Mechanical Seal Pump

    May 4, 2018The following are several common failure about the seal of mechanical seal flygt pump:(1). Leakage during installation of static test. After the mechanical seal is installed and debugged, the static p...view
  • The Mechanical Seal Of The Pump

    The Mechanical Seal Of The Pump

    May 4, 2018The mechanical seal of the pump is the material or part that prevents the leakage of fluid or solid particles from the adjacent surface and prevents the external impurities, such as dust and water, in...view
  • Sealing Technology

    Sealing Technology

    May 4, 2018Sealing technology mainly refers to the use of a certain combination of sealing materials, sealing elements and the corresponding seal structure form, to prevent or cut off the mass transfer process b...view