• Balanced seals
• Unbalanced seals
• Pusher seals
• Non-pusher seals
• Conventional seals
• Cartridge seals

Design

A basic mechanical seal contains three sealing points.

1.The stationary part of the seal is fitted to the pump housing with a static seal –this may be sealed with an o-ring or gasket clamped between the stationary part and the pump housing.

^{(Highlighted in red below, left the stationary part and right the rotary portion)}

2.The rotary portion of the seal is sealed onto the shaft usually with an O ring. This sealing point can also be regarded as static as this part of the seal rotates with the shaft.

3.The mechanical seal itself is the interface between the static and rotary portions of the seal.