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Exclusion Seals
directly into the glands on common cylinders. Typical properties for wiper materials are: hardness, 85-95 Shore A; tensile strength, 6,000 psi; elongation, 400%. They can typically be used in a temperature range from -40 to 210 F, although some manufacturers predict reduced life if the rods are exposed
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Basics of Design Engineering: Hydraulics New Sealing Systems Take the Heat
sealing systems. These include: Handle pressures to 42 MPa (6,000 psi) with short 55 MPa (8,000 psi) spikes. Handle continuous 110 or 120 C system temperatures, as well as cold-weather extremes to 40 C. Work with biodegradable and standard hydraulic fluids. Resist hydrolysis and glycolosis. Fit
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Fluid Power Reference Guide - Hydraulics and Fluid Handling
inconsistencies that can cause conventional threaded fasteners to leak. STC connectors also rotate during assembly, eliminating twists that dramatically shorten hose life. The fittings are said to weigh less and have a lower profile than threaded connectors. Working pressures are to 6,000 psi, with dash
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Fluid Motors
, reliability, and built-in lubrication, but are not normally governed. Gear-on-gear motors are the most common hydraulic units. They consist of a pair of matched spur or helical gears enclosed in a case. These units develop maximum torques of about 6,000 lb-in., accepting inlet pressures to 3,000 psi
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When Brazing Beats Welding
parts. For instance, the tensile strength of stainlesssteeljoints can exceed 130,000 psi. But because brazing temperatures are lower, generally 1,150 to 1,600 F, most physical properties remain unaffected. Distortion and warping are minimal, and it minimizes stresses in the joint area. Lower
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Mechanical systems go high-tech
. No reservoir is necessary, as water enters directly from the surrounding sea. A three-phase suction filter system -- prefilter, hydrocylone, and self-cleaning filter unit -- delivers 5 m sea water. Flow is to 60 lpm at pressures to 3,000 psi over ambient. It operates at depths to 6,000 m.
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Hydraulic Tube Fittings Deliver Leak-Free Performance and Long Life
and temperature limitations. Maximum operating pressure is generally 6,000 psi for sizes to 1 in. and 4,000 psi for 1.25 and 1.50-in. sizes. Temperature range depends on the seal material. Nitrile is most common and typically has a range of –30 to 250°F. Fluorocarbon O-rings handle temperatures to 400°F, while
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Exclusion Seals
cylinders. Typical properties for wiper materials are: hardness, 85-95 Shore A; tensile strength, 6,000 psi; elongation, 400%. They can typically be used in a temperature range from -40 to 210°F, although some manufacturers predict reduced life if the rods are exposed to steam and water over 190°F