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The stationary ring is usually made of stainless steel, although there are some made of ceramic or similar hard materials. The axial surface is also highly polished. At circumference of stationary piece, a rubber o-ring will be installed to seal against water leak through pump housing.
The spring(s) is installed around shaft and rotates with rotating component. The purpose of spring is to press rotating component of mechanical seal against stationary component so that matching surfaces are in contact with each other axially to shaft.
Because axial rubbing surfaces in contact are very highly polished, there is almost no leak there. Water does not leak through pump housing opening because of o-ring pressed between stationary component and pump housing. Water will also not leak through shaft because of o-ring in rotating component gripping against shaft.
So, if there is a leak in a mechanical seal of a pump, look for sources of leak in those 3 places. Surely one of them is not sealing properly.
For more information on mechanical seals and pump troubleshooting, download free software from Pump Troubleshooter
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