Application Of Gate Valve

application
The action or process of making such a request
a verbal or written request for assistance or employment or admission to a school; "December 31 is the deadline for applications"
The action of putting something into operation
the act of bringing something to bear; using it for a particular purpose; "he advocated the application of statistics to the problem"; "a novel application of electronics to medical diagnosis"
A formal request to an authority for something
the work of applying something; "the doctor prescribed a topical application of iodine"; "a complete bleach requires several applications"; "the surface was ready for a coating of paint";

gate valve
A valve with a sliding part that controls the extent of the aperture
A gate valve, also known as a sluice valve, is a valve that opens by lifting a round or rectangular gate/wedge out of the path of the fluid.
(GATE VALVES) have a wheel type handle. Several turns of the handle are required to turn off a gate valve. Gate valves are most commonly used on main line pipes with high water pressure or high water flow.
A valve that lets you completely stop, but not modulate, the flow within a pipe.