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Each fixture usually has a characteristic means of connection. Normal plumbing practice is to install a valve on each water supply line before the fixture, and this is most commonly termed a stop or "service valve". The water supply to some fixtures is cold water only (such as water closets and urinals).
An isolation valve is a valve in a fluid handling system that stops the flow of process media to a given location, usually for maintenance or safety purposes. [1] They can also be used to provide flow logic (selecting one flow path versus another), and to connect external equipment to a system. [ 2 ]
Backflow prevention device. The simplest, most reliable way to provide backflow prevention is to provide an air gap.An air gap is simply an open vertical space between any device that connects to a plumbing system (like a valve or faucet) and any place where contaminated water can collect or pool.
For example, most circuit breakers have a provision to have a small padlock attached to prevent their activation. For other devices such as ball or gate valves , plastic pieces which either fit against the pipe and prevent movement, or clamshell-style objects which completely surround the valve and prevent its manipulation are used.
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The tongue may or may not be of the same material as the grooved pieces joined by the tongue. For example, plywood flooring is commonly grooved at the edges, and plastic tongues are used to form the joint. In old sailor slang vernacular, a "tonguin" (pronounced / t ə ŋ ɪ n /) can refer to repairs made to a boat of tongue and groove construction.
An emergency disconnect system/sequence (EDS) disconnects the rig from the well in case of an emergency. The EDS is also intended to automatically trigger the deadman switch, which closes the BOP, kill and choke valves. The EDS may be a subsystem of the BOP stack's control pods or separate. [citation needed]
Choke valve, Butterfly valve used to limit air intake in internal combustion engine. (Not to be confused with choke valves used in industrial flow control, above.) Clapper valve: a type of check valve used in the Siamese fire appliance to allow only one hose to be connected instead of two (the clapper valve blocks the other side from leaking out)