There are four types of mechanical seal components: a primary seal: the ring and stationary ring. b secondary seal: seals. c pressing member: spring, pushing the ring. d transmission parts: Kei seat shells and key or fixing screw.
Mechanical seals work should pay attention to the problem:
 
1.Note the installation of mechanical seals
 
A. To be very careful to avoid the installation bias arising from installation
(1) On the gland should be performed after the coupling alignment, the bolts should be uniform on the support prevent the gland end surface deflection with feeler points, the error is less than 0.05 mm.
(2) Check the gland and the shaft or sleeve diameter with the gap (ie, concentricity), surrounded uniformly, with the feeler points tolerance is not greater than 0.01 mm.
B. Spring compression according to the provisions, does not allow too large or too small phenomenon, requiring error 2.00 mm. Excessive face pressure to increase and the other speed face wear. Too small will cause less than the pressure seal and can not play a role.
C. Ring-install it guaranteed the flexibility to move the shaft, the ring is pressed against the rear springs should be able to automatically bounce back.
 
2 Notes when removing the mechanical seal
A. When removing the mechanical seal carefully, prohibited the use of hand-hammer and flat shovel to avoid damaging the seal element. Do one pair wire hook in the direction of self-financing gap extends into the driving seat at the seals out. If less than the time scale demolition, should be cleaned before demolition.
B. When both ends if the pump mechanical seal, in the assembly, disassembly process take care of each other, to prevent a loss.
C. To run through mechanical seal, where a loose gland seal from moving the case, then the static ring parts must be replaced, it should continue to be used to re-tighten.
 
Mechanical seals normal operation and maintenance problems:
 
1.Preparation before starting the mechanical seal and notes
A. Comprehensive inspection of mechanical seals and ancillary equipment and piping installation is complete, compliance with technical requirements.
B. Before the mechanical seal startup hydrostatic test, check the mechanical seals for leaks. If the leak is more, you should find out the reason try to eliminate. If still valid, you should check the disassembly and re-installation. General hydrostatic test pressure for 2 to 3 kg / cm.
C. Press the pump rotation plate car, check for light evenly. Such as hard disk drive, or fail to operate, you should check whether the size of the error assembly, installation is reasonable.
 
2. Mechanical seal installation and decommissioning
A. Before start should remain sealed cavity filled with liquid. For when transporting solidified media applications vapor sealed chamber heated to medium melt. Before starting the disk drive must be to prevent a sudden start caused soft ring fragmentation.
B. For external use mechanical seal pump seal oil system, enable the seal oil system. After stopping the last stop seal oil system.
C. When the heat pump outage does not stop immediately seal oil and seal chamber cooling water should be at the seal oil drops below 80 degrees, it can stop the cooling water, so as not to damage the sealing parts.
 
3. Mechanical seal operation
 
A. After the pump is started if a slight leakage, should be observed for a period of time. As four hours of continuous operation, the leakage is still reduced, you should check the pump stops.
B. Operating pressure of the pump should be stable, the pressure fluctuation is not more than 1 kg / cm.
C. The pump in operation, should avoid taking the time phenomenon, so as to avoid the sealing surface of dry friction and seal damage.
D. Always check the mechanical seals. Operation, when the leakage exceeds the standard, heavy oil is not more than 5 drops / min, light oil is not more than 10 / min, such as 2-3 days, still no signs of improvement, it should stop the pump check bolt seal.

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