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Dock leveler – a height-adjustable platform used as a bridge between dock and truck, can be operated via mechanical , hydraulic, or air powered systems. Dock lift – serves the same function as a leveler, but operates similar to a scissor lift to allow for greater height adjustments. Dock seals or dock shelters – compressible foam blocks ...
Dock levelers are more expensive devices than the comparatively light-weight dock plates and dock boards. The most common form of dock leveler is the recessed, or pit, dock leveler. As the name suggests, this type of leveler is contained in a recess, or pit, beneath the dock door and floor surface.
This type of seal is exposed to movement. Rod seal: Is installed on the piston rod of a hydraulic cylinder. Prevents leakage of hydraulic fluid to the outside of the sealing system. Helps prevent contamination from entering the hydraulic system (in conjunction with a wiper seal). [3] [4] Piston seal: Is installed on the piston head.
John Crane is a UK company, now a subsidiary of Smiths Group and provider of engineered products and services including mechanical seals, couplings, seal support systems, filtration systems and digital diagnostics technologies. The company services customers in the energy services sector including production, transmission and storage, refining ...
Grimsby Dock Tower. The first accumulators for William Armstrong's hydraulic dock machinery were simple raised water towers. Water was pumped to a tank at the top of these towers by steam pumps. When dock machinery required hydraulic power, the hydrostatic head of the water's height above ground provided the necessary pressure.
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The first dry gas seal for a compressor was patented by Kaydon Ring & Seal in 1951 when it was known as Koppers Corporation. Field applications of dry gas seal designs were completed in 1952. The original patent was for Kaydon's "Tapered Ramp" lift geometry, a constant diameter / variable depth dynamic lift design.
Successful pipe designs (e.g. Flexible Pond Leveler, Castor Master, Clemson Pond Leveler) achieve this by protecting the intake end of the pipe with a cylindrical fence enclosure. A beaver swimming along the outside of the fence enclosure is unable to hear or feel the flow of water into the pipe and cannot reach it to block it.
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