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Topic: Hydraulic fluid

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In the News (Thu 26 Apr 18)

  Hydraulic fluid - Wikipedia, the free encyclopedia
Hydraulic fluids are a large group of liquids made of many kinds of chemicals.
The three most common types of hydraulic fluids are mineral oil, organophosphate ester, and polyalphaolefin.
Brake fluid is a subtype of hydraulic fluid with high boiling point and low freezing point.
en.wikipedia.org /wiki/Hydraulic_fluid   (316 words)

 Hydraulic machinery - Wikipedia, the free encyclopedia
In this type of machine, hydraulic fluid is pumped to a high pressure and transmitted throughout the machine to various actuators.
Pressurized fluid is controlled by the operator with a control valve and distributed through hoses and tubes.
The fluid then goes through a hose to the main valve where it is returned to the reservoir, or, if the main valve is engaged, routed to a hydraulic cylinder.
en.wikipedia.org /wiki/Hydraulic_machinery   (2179 words)

 Hydraulic Fluid Changes - Part 3.   (Site not responding. Last check: 2007-11-04)
Hydraulic fluid is the single most important part of the hydraulic system as it goes everywhere and operates all the valves.
The importance of good, clean hydraulic fluid of the correct type and its regular change can never be stressed often enough, as hydraulic systems work to very close tolerances, and the valves are made to very high standards.
Hydraulic units such as height correctors may still develop leaks or other faults as a result of the damage they sustained hut at least you can be sure that you have done everything possible to remove all traces of the original contaminant.
www.cybernex.net.au /clubs/cccv/reports/fluid3.html   (1365 words)

 Recycling of Military Hydraulic Fluid
The approved methodology of recycling hydraulic fluids, developed jointly by the Army and industry, involves the removing of contaminants from the fluids and revitalizing fluid additives.
The second phase of the hydraulic oil recycling effort involved identifying and/or developing commercial technology that would satisfactorily remove the contaminants from the military hydraulic fluid, without altering the physical and chemical properties of the reconditioned fluid.
Once commercial units were identified and/or developed that successfully cleaned-up the used fluid during laboratory testing, they were employed in a six month field demonstration to assess both the performance of the processing units themselves as well as monitor the performance of the hydraulic systems on the vehicles using the restored fluid.
aec.army.mil /usaec/technology/p2compliance04a.html   (2856 words)

 Hydraulic Fluid Changes - Part 1.   (Site not responding. Last check: 2007-11-04)
The tendency of all oils is to increase in viscosity with lowering of temperature, causing sluggish fluid flow, and decreasing in viscosity with higher temperatures increasing the possibility of fluid leaking past seals, and causing wear.
However, hydraulic fluid which appears clean to the naked eye may be contaminated to the point that it is unfit for use.
The early fluid -- LHS 2 -- is a synthetic fluid.
www.cybernex.net.au /clubs/cccv/reports/fluid1.html   (1246 words)

 ATSDR - Public Health Statement: Hydraulic Fluid
Hydraulic fluids are a very large class of materials that are used in machines and equipment to transfer pressure from one point to another.
Hydraulic fluids are also used in many machines like tractors and other farm equipment, forklift trucks, bulldozers, and other construction equipment, and airplanes.
Hydraulic fluids themselves cannot be measured in blood, urine, or feces, but certain chemicals in them can be measured.
www.atsdr.cdc.gov /toxprofiles/phs99.html   (2241 words)

 Hydraulic fluid decompression
The ratio of a fluid's decrease in volume as a result of increase in pressure is given by its bulk modulus of elasticity.
The bulk modulus for hydrocarbon-based hydraulic fluids is approximately 250,000 PSI, (17,240 bar) which results in a volume change of around 0.4% per 1,000 PSI (70 bar).
Decompression is an inherent problem in hydraulic press applications, which have large volume cylinders operating at high pressures (a garbage compactor is effectively a press).
www.insidersecretstohydraulics.com /hydraulic-decompression.html   (544 words)

 Advice for darkening hydraulic fluid
Two of the most common sources of extreme temperatures in a hydraulic system are; a hot spot caused from an external heat source in close proximity to the lube system, or the implosion of entrained bubbles as the bubbles flow from the reservoir into higher pressure zones like the pumps or valves.
In regards to the darkening hydraulic fluid it seems like there has been excesive heat build up and the darkening of oil is the result of fine carbon silt in the oil.
Hydraulic valves turning goldish in color could be a sign of varnishing, despite the oil analysis indicating no problems with the lubricant.
www.lube-tips.com /challenge/2003-01-22.asp   (2425 words)

 Hydraulic systems and fluid selection
Hydraulic systems can be found today in a wide variety of applications, from small assembly processes to integrated steel and paper mill applications.
The purpose of the hydraulic reservoir is to hold a volume of fluid, transfer heat from the system, allow solid contaminants to settle and facilitate the release of air and moisture from the fluid.
Hydraulic valves are made up of poppets or spools and can be actuated by means of pneumatic, hydraulic, electrical, manual or mechanical means.
www.oilmaintenance.com /ml/200201/hydraulic.asp   (2333 words)

 Duke Hydraulic Fluid - What is it?   (Site not responding. Last check: 2007-11-04)
The Duke hydraulic fluid situation that appears to be all over the news these days is a frightful situation for the nearly 4000 patient who are affected.
In this particular case, hydraulic fluid was used in the hospital's elevator, drained while the elevator was being serviced, and mistakenly used to “clean” surgical tools at Raleigh-Durham area hospitals last year, putting several thousand people at risk of severe infection and many other injuries.
The Duke hydraulic fluid situation was only discovered when medical staff began complaining of tools feeling too “slick.” Since tools are “greased” to a certain extent for surgery, this was not outlandishly alarming to staff but it was these complaints that lead them to find the frightening truth behind the over-oiled instruments--hydraulic fluid.
www.ncpersonalinjurylaw.com /duke-hydraulic-fluid-what-is-it.php   (294 words)

 Recycling of Military Hydraulic Fluid   (Site not responding. Last check: 2007-11-04)
Field investigations have shown that the most common reason for used hydraulic fluid being drained from vehicles and discarded is because it has become contaminated to such a degree that damage to the hydraulic system could result.
The only means available for determining when used fluid had been sufficiently processed was to collect and analyze samples for water content and particle count or to simply process the fluid for an extended period of time to ensure all contaminants were removed.
Recycling hydraulic fluid to specification performance means less new fluid must be kept in stock to meet fluid usage requirements.
www.afcee.brooks.af.mil /eq/recycling/hydraulic.htm   (2846 words)

 Conventional Hydraulic Oils - Supplier Data by Castrol
The function of a hydraulic fluid is to provide a means of power transfer in a hydraulic circuit.
Hydraulic fluids containing antiwear additives are similar in  all other respects to conventional  standard hydraulic fluids.
Conventional mineral based hydraulic fluids are the most widely used in hydraulic oil applications.
www.azom.com /details.asp?ArticleID=2234   (387 words)

A hydraulic fluid purifier is a small, portable electrically powered ground support system designed to recondition hydraulic fluid to a "like new" condition that can then be successfully reused in military vehicles, aircraft and support equipment.
Hydraulic fluid purification systems remove particulates, water, air and chlorinated solvent contaminants using 3-micron absolute filters, water adsorption filters, air desiccant filters, and a low vacuum, without altering the physical or chemical properties of the reconditioned fluid.
The on-site recycling of hydraulic fluid with a certified hydraulic oil recycler greatly reduces the amount of oil that must be disposed of as a hazardous waste in accordance with RCRA, 40 CFR 260-266, 268, and 270.
p2library.nfesc.navy.mil /P2_Opportunity_Handbook/6_II_6.html   (987 words)

 Hydraulic Fluid Contamination
Hydraulic fluid contamination can be defined as any substance or foreign material in fluid that is capable of adversely affecting system performance/ reliability.
Hydraulic fluid contamination treatment is just one of the services we provide.
Hydraulic Fluid Contamination is a vital process, remember the old adage, "an ounce of prevention is worth a pound of cure." Trust your hydraulic fluid contamination and other aircraft requirements to us.
www.avcorp.com /hydraulic-fluid-contamination.asp   (207 words)

 [No title]   (Site not responding. Last check: 2007-11-04)
The Duke hydraulic fluid in the Duke Medical System hydraulic fluid cases is said to have come from an elevator in one of the hospitals.
It was determined the elevator workers emptied the Duke Medical System hydraulic fluid into several empty detergent containers during a maintenance visit in September 2004, but it was the detergent company that later picked up the containers of used Duke hydraulic fluid and re-distributed them to the two hospitals.
Duke officials have evaluated the Duke hydraulic fluid situation and assured that there is little chance this mistake would cause medical problems but the federal Centers for Medicare and Medicaid Services have cited the hospital and the elevator company for a number of mistakes.
www.ncpersonalinjurylaw.com /duke-medical-system-hydraulic-fluid.php   (392 words)

 || DukeMedNews || Background on Hydraulic Fluid
RTI conducted an analysis to determine how much hydraulic fluid remained on surgical instruments after they had been rinsed in very hot water and then sterilized, as was the case in the incident at Durham Regional Hospital.
With the exception of zinc, which is in one of the additives in the original fluid and present at the expected low level, the majority of the metals were not detectable and a few were barely detectable using sophisticated testing equipment.
Hydraulic Fluid Clarification June 21, 2005 -- A note to reporters from the Duke University Medical Center News Office regarding continuing coverage of the incident.
www.dukemednews.duke.edu /mediakits/detail.php?id=9092   (949 words)

 Duke Hydraulic Fluid - HensonFuerst
Hydraulic fluid is a collective mix of liquid chemicals used in a variety of machinery ranging from automatic transmissions and brakes in cars to industrial machines such as forklifts and bulldozers.
Hydraulic fluids serve the function of transferring pressure from one point to another and are most commonly found in machines that push, pull, lift and hold heavy objects.
The fluid in the North Carolina hydraulic fluid injury cases at the Duke Health Raleigh Hospital and the Durham Regional came from an elevator while it was being serviced.
www.lawmed.com /hydraulic-fluid-injury.php   (352 words)

 Hydraulic Fluid Viscosity
It doesn't matter how good the anti-wear, anti-oxidization or anti-corrosion properties of the fluid are, if the viscosity grade is not correctly matched to the operating temperature range of the hydraulic system, maximum component life will not be achieved.
Automatic transmission fluid, multi-grade engine oil and anti-wear, high VI (AWH) hydraulic fluid are commonly used in hydraulic systems that experience a wide operating temperature range.
When selecting a high VI fluid, the component manufacturer's minimum permissible viscosity value should be increased by 30% to compensate for possible loss of viscosity as a result of VI improver sheardown.
www.insidersecretstohydraulics.com /hydraulic-fluid.html   (381 words)

 Biodegradable Plant-Based Hydraulic Fluid
Plant estolide-based hydraulic fluid could replace conventional fluid in a wide range of industrial and farm equipment.
A commercial-grade, biodegradable hydraulic fluid to power heavy equipment is just around the corner, thanks to a new process that creates a key component from vegetable oil.
Caterpillar is testing the new biodegradable hydraulic fluid in cooperation with ARS and Lambent Technologies of Chicago, Illinois.
www.ars.usda.gov /is/AR/archive/nov98/oil1198.htm   (608 words)

 Recycling of Military Hydraulic Fluid
Used hydraulic fluid is drained from vehicles and discarded not because it has depleted its ability to perform but because it has become contaminated to such a degree that damage to the hydraulic system could result.
Much of the used fluid processed during the field demonstration was adequately cleaned in less than three hours, but because filter efficiency decreases with the amount of fluid passed through the filter, a significant margin of error must be built into the processing time.
When the fluid relative humidity level drops to a level that corresponds to less than 500 ppm water, an indicator light on the unit tells the operator that the fluid has been processed and the unit shuts off automatically.
www.pall.com /Aerospace_3352.asp   (1708 words)

 NASD: Safe Use of Hydraulic Systems
Fluid can be trapped in the hydraulic system even when the engine and hydraulic pump are stopped.
Escaping, pressurized hydraulic fluid is not a safety concern.
If hydraulic fluid is injected into the skin, wash the area immediately and return to work.
www.cdc.gov /nasd/docs/d001701-d001800/d001703/d001703.html   (422 words)

 Slash the Operating Cost of Hydraulic Equipment by Thousands of Dollars Every Year!
As a 15 year veteran of the industry, who's seen it all, I can tell you that when it comes to repairing and replacing hydraulic components there are elements within the fluid power industry who will take advantage of you to increase their profits.
Insider Secrets to Hydraulics is the first book to comprehensively address both the technical and the commercial issues involved in the maintenance, repair and overhaul (MRO) of hydraulic equipment.
Hydraulic equipment succumbs to the same problems, and the fluid power industry operates in a similar way, everywhere in the world.
www.insidersecretstohydraulics.com   (1977 words)

 Enduro - Hydraulic Fluid Conditioner (Conklin)   (Site not responding. Last check: 2007-11-04)
It also provides additives that improve a hydraulic fluids ability to handle water contamination.
Hydraulic systems can be protected to operate smoother, quieter and cooler with Conklin's concentrated Enduro®.
Applications: Enduro is compatible with all anti-wear hydraulic fluids and other lubricants used in hydraulic systems.
www.mooreagrisales.com /vehicles/enduro.html   (136 words)

 Hydraulic Fluid Precautions
Hydraulic fluid becomes a hazard if it is sprayed, heated to its flash point, or otherwise subjected to conditions that cause vaporization.
Hydraulic fluid must never be stored in a missile stowage, testing, or maintenance area.
Hydraulic fluid should be kept in closed metal containers.
www.tpub.com /gunners/121.htm   (794 words)

 Maintenance of Pressurized Hydraulic Fluid   (Site not responding. Last check: 2007-11-04)
Pressurized hydraulic fluid is the power-transmitting medium in a servohydraulic system, and caring for the fluid is essential to system longevity and quality test results.
Fluids must be clean to support the rigor of operating at thousands of cycles a minute and millions of cycles per test.
High fluid temperature can also cause premature hydraulic fluid breakdown as anti-wear ingredients fail, a condition that may produce a cascade of negative effects on system hydraulic components.
www.mts.com /materials/Solutions_0401/silentflo.htm   (647 words)

 Biodegradable Hydraulic Fluid Nears Market / April 19, 2000 / News from the USDA Agricultural Research Service
A new vegetable-based biodegradable hydraulic fluid for use in heavy equipment is moving toward commercialization.
Technically, hydraulic fluids don’t lubricate mechanical systems; instead, they transfer pressure in machinery to activate motion, such as a moving crane or a blade.
Other scientists at the Peoria research facility are engaged in trials with Caterpillar to test biobased hydraulic fluids and biodiesel fuels in heavy equipment.
www.ars.usda.gov /is/pr/2000/000419.htm   (294 words)

 Hydraulic Tutorials
Hydraulic pump life cut short by fluid contamination
When selecting a hydraulic fluid for a particular application a number of properties may need to be considered.
It should be on the bookshelf of every engineer, supervisor, planner and technician that deals with hydraulic equipment...
www.hydraulicsupermarket.com /technical7.html   (140 words)

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