Help, the water pump keeps leaking. What kind of seal should be used?
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It’s the plug-in type, with a pressure of 40 kilograms and a water temperature of around 50 degrees. It started with a PTFE gasket, but it leaked after not long. Later it was changed to rubber, similar to a hydraulic seal; at first there was no leakage, but after half a month it stopped working. A layer of ceramic is applied on the shaft. I don’t know what kind of pump it is specifically, and what kind of sealing is used?
Replace the packing seal with a modular mechanical seal and use external flushing
Plug-in type? Is the poster referring to a reciprocating pump?
For water pumps, a mechanical seal is sufficient
Plunger pumps can only be sealed with packing
It moves axially; will it work if sealed with a mechanical seal? It is not a radial rotational motion.
Reply to 6# Jiangnan’s Talent: From your description, it seems to be a plunger pump. High-quality packing, such as carbon fiber impregnated with PTFE, should be used. The main causes of leakage include: the packing being compressed too tightly, scratches on the plunger rod, and excessive swinging of the plunger rod (due to large clearance in the bearing shells or worn crossheads).
The packing seal you are using is leaking; this may be due to the packing not being compressed properly during installation or an incorrect method of packing. If the same problem occurs after replacing the packing material, it could be caused by vibration of the pump shaft or surface corrosion and damage to the shaft.