Introduction of PU valve rubber:
The moving ring on the medium side is rotating, and the sealing ring relies on the moving ring seat and O-ring to seal and guide the direction. The friction surfaces of the moving ring on the medium side and the stationary ring on the medium side are affected by the pressure of the shaft seal water in the seal chamber. Now, join XinRuiTuo to understand the introduction of polyurethane valve rubber and the function of rotary sealing valve.
It is required that the pressure of the shaft seal water is 0.15-0.2 MPa higher than the maximum pressure of the sealed medium. In addition to this inwardly acting pressure difference, the liquid film between the friction end faces is also subjected to centrifugal force, and the two inwardly acting forces are cumulative. Therefore, the leakage rate of such a seal is lower than that of a seal with a pressure differential acting from the inside to the outside. Because the polyurethane valve rubber has requirements on the pressure of the shaft seal water, a pressure gauge of a suitable specification is designed and installed at the outlet connection of the shaft seal water to control the pressure of the shaft seal water inside the mechanical seal cavity. The high-pressure shaft seal water leaks to the medium side, preventing the medium from penetrating to the sealing side, thus playing the role of lubrication and cooling. Another advantage of this arrangement is that it reduces the wear of the friction surface and prevents a large amount of medium from leaking out.
The role of the rotary seal valve is:
The coke quantitatively discharged by the vibrating feeder is continuously discharged in a closed state. Therefore, it is required that the airtightness of the rotary sealing valve is good, the lining plate of the inner rotor has good wear resistance and long service life. The inside of the shell needs to be airtight, and each lubricating point is automatically filled with lubricating grease by a lubricating pump at regular intervals. The coke discharged from the vibrating feeder falls from the upper inlet of the rotary sealing valve, and is discharged from the lower coke outlet after the rotation of the rotor. The rotary sealing valve is fixed on a movable trolley, and the valve rubber is centrifugally cast and pushed out to the maintenance platform along the track laid on the ground during repair. In addition, compensators are provided on the upper and lower sections of the rotary sealing valve for the convenience of installation. The rotary sealing valve rotates forward during normal production, but when dealing with material jam accidents, there is a reverse rotation button on the on-site operation panel.
The above is the introduction of polyurethane valve rubber and the function of rotary sealing valve compiled and shared by Xinruituo. For more information, welcome to continue to pay attention.
