Velan Top Entry Ball Valves

ball valves
(ball valve) any valve that checks flow by the seating of a ball
(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.
A one-way valve that is opened and closed by pressure on a ball that fits into a cup-shaped opening

velan
Murugan (???????, ????????), also called Subrahmanya (???????????,???????????????? ??????), is a popular Hindu deity among Tamil Hindus, worshipped primarily in areas with Tamil influence, especially South India, Singapore, Sri Lanka, Malaysia and Mauritius.
The verb velar isn't particularly common. In this context it means "to keep watch" or "to take care."

entry
an item inserted in a written record
An act of going or coming in
The right, means, or opportunity to enter a place or be a member of something
introduction: the act of beginning something new; "they looked forward to the debut of their new product line"
a written record of a commercial transaction
A place of entrance, such as a door or lobby

top
top(a): situated at the top or highest position; "the top shelf"
Be taller than
the upper part of anything; "the mower cuts off the tops of the grass"; "the title should be written at the top of the first page"
Be at the highest place or rank in (a list, poll, chart, or league)
exceed: be superior or better than some standard; "She exceeded our expectations"; "She topped her performance of last year"
Exceed (an amount, level, or number); be more than