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  2. Service animal - Wikipedia

    en.wikipedia.org/wiki/Service_animal

    A service animal is an animal that has been trained to assist a disabled person. The animal needs to be individually trained to do tasks that directly relate to the handler's disability, which goes beyond the ordinary training that a pet receives [3] [4] and the non-individualized training that a therapy dog receives.

  3. Gate valve - Wikipedia

    en.wikipedia.org/wiki/Gate_valve

    An electric multi-turn actuator on a gate valve. A gate valve, also known as a sluice valve, is a valve that opens by lifting a barrier (gate) out of the path of the fluid. Gate valves require very little space along the pipe axis and hardly restrict the flow of fluid when the gate is fully opened.

  4. List of valves - Wikipedia

    en.wikipedia.org/wiki/List_of_valves

    Larner–Johnson Valve: needle control valve often in large sizes used in water supply systems; Leaf valve: one-way valve consisting of a diagonal obstruction with an opening covered by a hinged flap; Line blind valve: a thin sheet oriented perpendicular to the pipe. The sheet has a solid end and a flow-through end; sliding it from one position ...

  5. Piping and plumbing fitting - Wikipedia

    en.wikipedia.org/wiki/Piping_and_plumbing_fitting

    Non-return or check valves allow the free flow of a fluid in one direction but prevent its flow in a reverse direction. They are often seen in drainage or sewage systems but may also be used in pressurized systems. Valves are available in several types, based on design and purpose: Gate, plug, or ball valves – Isolation; Globe valve ...

  6. Christmas tree (oil well) - Wikipedia

    en.wikipedia.org/wiki/Christmas_tree_(oil_well)

    A basic surface tree consists of two or three manual valves (usually gate valves because of their flow characteristics, i.e. low restriction to the flow of fluid when fully open). A typical sophisticated surface tree will have at least four or five valves, normally arranged in a crucifix type pattern (hence the endurance of the term "Christmas ...

  7. Valve - Wikipedia

    en.wikipedia.org/wiki/Valve

    The internal elements of a valve are collectively referred to as a valve's trim. According to API Standards 600, "Steel Gate Valve-Flanged and Butt-welding Ends, Bolted Bonnets", the trim consists of stem, seating surface in the body, gate seating surface, bushing or a deposited weld for the backseat and stem hole guide, and small internal ...