SpudFiles

Very cool!

CS wrote:dynamic seal operated by a solenoid is just metal on metal

What kind of force is used to help hold the seal or does the solenoid do all the work? Stepped seat? Dome/curved seat? Details my good man details....

Just a hole in the center, then a tungsten carbide ball is pressed .0005" into the hole, and then surfaced cleaned. Then a silicon carbide ball is used for the actual seal.

The taper is to small to be seen. A microscope is used to check for small particles that which will mess up the seal when pressing. The balls are very smooth and no pitting when looked at under a microscope. It is seated just with gravity, when testing, but when in a finished valve a spring seats the ball.

I imagine the spring is stainless steel to slow oxidation where it rest against the ball.