Using electrical motors to drive gearing may be an excellent choice when cost is a consideration. Electrical wires can be laid more easily and electrical systems are relatively clean.

Use of hydraulics may be excellent where power and simplicity is important.

Most of actuators operate in a linear (straight line) manner. Hydraulic rams, and pneumatic diaphragms work in this manner. There are also some that are constructed to operate in a rotary manner.

Electrical motors normally operate in a rotary manner. However if a linear motion is needed, this can be obtained by means of spur gears, rack and pinion arrangements, crank and other means.

Actuators can provide power to move final control elements, but do they know when to stop?

A good control system will provide sensing and feedback loop to tell actuator when to stop its actions.

Well folks, be in control!

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Stationary Component

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.

Spring

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