Beta Ball Valves

ball valves
(ball valve) any valve that checks flow by the seating of a ball
A one-way valve that is opened and closed by pressure on a ball that fits into a cup-shaped opening
(Ball valve) A ball valve is a valve with a spherical disc, the part of the valve which controls the flow through it. The sphere has a hole, or port, through the middle so that when the port is in line with both ends of the valve, flow will occur.
(Ball Valve) A simple non-return valve consisting of a ball resting on a cylindrical seat within a liquid passageway.

beta
Denoting the second of a series of items, categories, forms of a chemical compound, etc
the 2nd letter of the Greek alphabet
preliminary or testing stage of a software or hardware product; "a beta version"; "beta software"
The second letter of the Greek alphabet (?, ?), transliterated as ‘b.’
The second (usually second-brightest) star in a constellation
second in order of importance; "the candidate, considered a beta male, was perceived to be unable to lead his party to victory"