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A trunnion ball valve has additional mechanical anchoring of the ball at the top and the bottom, suitable for larger and higher pressure valves (generally above 3.9 in (10 cm) and 580 psi (40 bar)). A floating ball valve is one where the ball is not held in place by a trunnion.
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The ball valve closes and there is a higher air pressure under the brake pistons than above it, and the pressure differential forces the piston upwards, applying the brakes. The driver can control the amount of braking effort by admitting more or less air to the train pipe.
Although traditionally disc-shaped, discs come in various shapes. Depending on the type of valve, a disc can move linearly inside a valve, or rotate on the stem (as in a butterfly valve), or rotate on a hinge or trunnion (as in a check valve). A ball is a round valve member with one or more paths between ports passing through it.
A trunnion (from Old French trognon 'trunk') [1] is a cylindrical protrusion used as a mounting or pivoting point. First associated with cannons, they are an important military development. First associated with cannons, they are an important military development.
These pumps are used for high flows at relatively low pressure (max 100 bars (10,000 kPa)). [clarification needed] They were used on board ships where a constant pressure hydraulic system extended through the whole ship, especially to control ball valves [clarification needed] but also to help drive the steering gear and other systems. The ...