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Bar gate. Animation of level crossing booms lowering in Queensland, Australia. A bar gate in the Netherlands. A bar, post, pole, beam, or boom gate, [1] also known as a boom or a boom barrier, [citation needed] is a beam or bar on a pivot used as a gate. The boom is lowered to block vehicular or pedestrian access through a controlled point or ...
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. The gate faces can be parallel but are most commonly wedge-shaped (in order to be able to apply ...
These were Bombardier's EBI Gate 2000 barriers (also called the EBI Gate 630) which were used alongside the Bombardier EBI Gate 2000 system. [37] These have barrier arms that are safer in the event of them being hit, as they break in set places. They also have supporter pogo-sticks at the end of the barrier as did the GWE barriers beforehand.
The drop-arm optical turnstile is a combination of the security of a tripod or barrier turnstile and a fully optical turnstile. The lanes can have either single or double arms. When access is granted the arms drop into recesses in the cabinet. Once the arms drop out of the way, the turnstile functions as a fully optical turnstile.
Traffic barrier with a pedestrian guardrail behind it. Traffic barriers (known in North America as guardrails or guard rails, [1] in Britain as crash barriers, [2] and in auto racing as Armco barriers [3]) keep vehicles within their roadway and prevent them from colliding with dangerous obstacles such as boulders, sign supports, trees, bridge abutments, buildings, walls, and large storm drains ...
Tainter gate being constructed, in 1936, on the upper Mississippi River, Lock and Dam No. 7 (Onalaska Dam), La Crescent, Minnesota (USACE) Stevenson Dam Tainter Gate on the Housatonic River in Connecticut. The Tainter gate is a type of radial arm floodgate used in dams and canal locks to control water flow.
The Maeslantkering ("Maeslant barrier" in Dutch) is a storm surge barrier on the Nieuwe Waterweg, in South Holland, Netherlands. [1] It was constructed from 1991 to 1997. As part of the Delta Works the barrier responds to water level predictions calculated by a centralized computer system called BOS. It automatically closes when Rotterdam ...
A level crossing with manually-controlled full barriers at Chertsey, England. The barriers are rising. A four-quadrant gate or full-barrier equipment is a type of boom barrier gate protecting a grade crossing. It has a gate mechanism on both sides of the tracks for both directions of automotive traffic. The exit gates blocking the road leading ...
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