Best o-rings for hydraulic quick connects: Loaders  -- Tractor Attachments Implements 3ph Discussion Forum and Review Best o-rings for hydraulic quick connects: Loaders -- Tractor Attachments Implements 3ph Discussion Forum

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 01-24-2017, 13:29 Post: 196181
boltboss



Join Date: Aug 2009
Location: Cassopolis, MI
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Posts: 40
 Best o-rings for hydraulic quick connects

Does anyone have advice on the best (most durable) o-rings to use in hydraulic quick connects? I currently replace mine with plain (probably buna-n) o-rings. They seal good for a while and then go to leaking again. It isn't hard to replace them of course, it's just annoying. Is there a better, more durable o-ring available for this type of application? Thanks!






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 01-27-2017, 10:50 Post: 196186
minimac



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 Best o-rings for hydraulic quick connects

Thanks for bringing this up... seems like there are lots of grades / types...


-Nitrile (Buna-N)

Temperature range: Between -65 degrees Fahrenheit and 300 degrees Fahrenheit.
Suited for: General purpose seals, such as petroleum oils, water and some hydraulic fluids. Buna-N is also resistant against tears and abrasive treatment.
Deficiencies: Buna-N can have problems with automotive brake fluid, ketones, phosphate ester hydraulic fluids, and nitro and halogenated hydrocarbons. While it is ozone and weather resistant, this resistance is not infallible but can be supported through compounding.
Applications: Nitrile functions well in applications that have limited temperature and resistance requirements.

-Ethylene Propylene Rubber (EPR)

Temperature range: Between -65 degrees Fahrenheit and 300 degrees Fahrenheit.
Suited for: Skydrol, a hydraulic fluid, has a noxious smell and can irritate skin, and its corrosive properties can be damaging to equipment. EPR o-rings work well with Skydrol and other hydraulic fluids, as well as steam, water, silicone oils, brake fluids and alcohols.
Deficiencies: Similar to nitrile, EPR is not perfect for a wide-range of applications due to wear and tear issues.
Applications: The aerospace industry uses EPR o-rings in hydraulic pumps.

-Fluorocarbon (Viton)

Suited for: Fluorocarbon is an all around material that can handle a number of applications, especially diverse sealing jobs that involve movement. It is also suited for petroleum oils, silicone fluids and gases, acids and some halogenated hydrocarbons, like carbon tetrachloride.
Deficiencies: Fluorocarbon is not recommended for Skydrol, amines, esters and ethers with low molecular weight and hot hydRolling on the floor laughinguoric acids.
Applications: Fluorocarbon o-rings are very versatile, and features in many different automotive, appliance and chemical processing industries.

-Neoprene

Suited for: Neoprene can seal refrigerants in refrigeration and air conditioner units, as well as petroleum oils and mild acid resistance silicate ester lubricants.
Deficiencies: Finished neoprene products are often compounded with lead-based agents, which can be hazardous to human health. Additionally, some people are allergic to basic neoprene. In a functional sense, it is not very resistant to petroleum lubricants and oxygen.
Applications: Neoprene functions well in refrigeration units of air conditioning systems.
Temperature range: Between -65 degrees Fahrenheit and 300 degrees Fahrenheit.

-Polyurethane

Temperature range: Between -65 degrees Fahrenheit and 212 degrees Fahrenheit.
Suited for: Polyurethane features abrasion and extrusion resistance, as well as general toughness.
Deficiencies: Applications requiring good compression and heat resistance would not be suitable for polyurethane.
Applications: Polyurethane o-rings are often used for hydraulic fittings, cylinders and valves, pneumatic tools, and firearms.

-Silicone

Temperature range: Between -120 degrees Fahrenheit and 450 degrees Fahrenheit, although silicone o-rings have been shown to withstand -175 degrees Fahrenheit during short periods of exposure.
Deficiencies: Silicone exhibits poor tear resistance, abrasion and tensile strength. Their poor abrasion resistance means they are better suited for static applications than dynamic. They do perform well with water, steam or petroleum fluids, either.
Applications: High temperature fuel injection ports can use silicone o-rings.
Temperature range: Between -100 degrees Fahrenheit and 500 degrees Fahrenheit.
Suited for: Pure PTFE o-rings are very rigid and hard to apply, but PTFE encapsulated o-rings handle surface wear well, in addition to exhibiting corrosion and abrasion resistance, non-permeability, chemical inertness and low absorption.
Deficiencies: Like silicone, PTFE is rigid and is better suited to static applications.
Applications: Examples of PTFE o-ring use includes automotive steering devices and paint guns.






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