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The fork end is routinely used to shut off gas meter valves. The Halligan can be used as a step to get up on a window that is at head level. [15] The Halligan can be tied to a rope and act as an anchor in the window frame, for improvised bailout. [16]
Patent drawing of a United States hydrant wrench. [1] The head of a hydrant wrench. The shape of a hydrant wrench is sometimes adapted so it can be used as a tool for other purposes, such as: Storz and spanner hose couplings; Rocker lug couplings; Water meter shutoff valves; Gas cock valves; Pentagonal nuts; Square nuts.
A shutdown valve (also referred to as SDV or emergency shutdown valve, ESV, ESD, or ESDV; or safety shutoff valve) is an actuated valve designed to stop the flow of a hazardous fluid upon the detection of a dangerous event. This provides protection against possible harm to people, equipment or the environment.
Valves can be categorized into the following types, based on their operating mechanism: Ball valve, for on–off control without pressure drop. Ideal for quick shut-off, since a 90° turn completely shuts off, compared to multiple 360° turns for other manual valves; Butterfly valve, for on–off flow control in large diameter pipes
The shut off butterfly valve for a Francis turbine at Gordon Power Station, Tasmania Ball valve The "seat" is the interior surface of the body which contacts the disc to form a leak-tight seal. In discs that move linearly or swing on a hinge or trunnion, the disc comes into contact with the seat only when the valve is shut.
Isolation valves must effectively stop the passage of fluids. [4] Gate valves, ball valves and plug valves are generally considered to provide tight and effective shut-off. Globe valves and Butterfly valves may not be tight shut-off due to wear on the plug or the seat, or due to their design, and may not be appropriate to provide effective ...