Gear pump is stopped after maintenance and seal failure

Gear pumps belong to relatively good quality and have some special application in all gear pump. To analyze the main reason for downtime, thus causing unnecessary damage to the machine can be avoided in the future. Downtime is primarily caused by the failure of the mechanical seal. Gear pump is stopped after maintenance and seal failure.
 
Failure of performance mostly leak, leak the following reasons:
 
① static ring sealing surface leakage, the main reasons are: Face flatness, roughness does not meet the requirements, or surface scratches; between the end face of particulate matter, resulting in both ends of the surface can not be the same operation; installed in place, the wrong way.
 
② compensation ring seal leakage, the main reasons are: gland deformation, uneven preload; not properly installed; seals do not meet quality standards; seal selection wrong.
 
Gear pump stops running after the requirements:
 
① delivery pump easy to crystallize, easy to solidification, easy precipitation and other media, after stopping the pump should prevent clogging, and promptly flushed with water or other media pumps and pipes.
 
② high temperature pumps provisions parking equipment technical documentation shall be executed, parking should be every 20 to 30min Turning Partial half circle until the pump until the temperature dropped to 50 ℃.
 
③ low temperature pump stop, when no special requirements, the pump should always be filled with liquid; suction and discharge valves should normally open; with double mechanical seal cryogenic pumps, liquid level controller and pump seal cavity sealing liquid Keep grout pump pressure.