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  • Do You Know How Extreme Cold Affects Your Hydraulic Hose properties?  - Forestry equipment in winter - Parker Low Temperature Hoses for extreme cold environment

    Extremely cold environments with conditions such as snow, ice and high wind speeds are a challenge for all rubber hydraulic hoses. 

    Frequently, hoses must withstand temperature ranges below -57 °C which influences the rubber compounds used on the inner tube and the hose cover. What does this mean for your equipment?


    What are the consequences of changed material characteristics in rubber hoses exposed to extreme cold?  

    When rubber is permanently cooled, the material characteristics and the bending behaviour will change even if the product has been developed for such temperature limits. Elastomers are used at the inner tube and the hose cover. When cooled to permanent low temperatures, hoses may no longer behave with their normal characteristics and become hard, stiff and inelastic. They can even decompose or work at reduced performance under continuous thermal loads. The material parameters change under the influence of heat and cold. If you cool down to lower temperatures, rubber becomes hard, tough and leathery.

    Engineers describe this process with thermal changes that affect the molecular behaviour and the microstructure becomes crystalline. The result is that the rubber compounds become brittle, but in principle they remain deformable. The heat builds up in heat or mechanical energy. At -40 ° C (depending on rubber compound and hardness) the so-called glass point is reached; the rubber is hard. Crystallization of the elastomer at low temperatures may cause cracking. However, this depends strongly on the type of load in the low temperature range, more critical here are shock loads. We strongly recommend a regular visual inspection of the rubber for cracks, which can reduce its service life under unfavourable conditions and failure and leakage can occur when the temperature exceeds the rubber compounds acceptable range.


    How do the right ingredients influence the performance of rubber hoses in extreme cold?  Do You Know How Extreme Cold Affects Your Hydraulic Hose properties?  - No-Skive Multispiral hose SX35LT_SX42LT

    Hose manufacturers, such as Parker, are continuously putting their designs to the test.  With the latest in technology, our state-of-the-art materials development and performance test labs are capable of determining baseline engineering and design properties to ensure that hoses meet application requirements. The cold-flexibility test is one of those tests required to meet specific specifications such as ISO 10619-2. An advantage to Parker's manufacturing process is the use of in-house compounds. This advantage opens new opportunities for the ideal compounds mixture of hoses such as Parker's SX35LT and SX42LT, which are multispiral hoses with four or six spiral high tensile steel wires for high pressure applications of 35,0 Mpa (5000 psi) and 42,0 Mpa (6000 psi) for extreme cold environments. These hoses are developed for extreme cold and demanding low temperature applications.

    Parker also offers braided hoses with a synthetic rubber inner tube and as well a No-Skive thin synthetic rubber cover construction for mobile applications in low temperature environments such as forestry machines or refrigerated warehouses (461LT) or a 3-wire braid low-temperature compact hose with 4SP working pressures (371LT). These two hose types are not only cold resistance up to -50 °C but also characterized for an excellent ozone resistance. General typical applications are heavy construction equipment, side booms, mining and/or mobile equipment, arctic oil fields, materials handling in low temperature conditions, snow grooming equipment and any cold storage applications.

      Hoses fail when you least expect it; What does this mean for you when working in remote places?

    If your equipment relies on hydraulic systems, you know, it is not “IF” but “WHEN” a hydraulic hose fails, the race against downtime begins. The longer your equipment is down, the greater the loss and cost. Hydraulic system failures cause 35 to 65 percent of all mobile equipment downtimes – a great part due to relatively simple and cheap hydraulic hoses.


    Do You Know How Extreme Cold Affects Your Hydraulic Hose properties?  - Replacement of hydraulic hose assemblies with the Parkrimp No-Skive system


    Ask yourself the following questions:

    1. Do you lose money when your equipment is down?
    2. Do you have to travel a far distance to reach the nearest hose workshop?
    3. Do you have to wait a considerable time for a replacement hose assembly?
    4. Do you have to replace hose assemblies often?
    5. Do you have to replace hoses at night or even on weekends?

    If YES is the answer to your questions, then the Parker Parkrimp No-Skive Self-Assembly system might be a problem solver for you.

    Learn more about how to make your own assemblies using Parkrimp® No-Skive hose crimpers. ​

    International companies with substantial expertise, such as Parker, have a global presence for the leading companies of the mobile market and can offer the right hose for each mobile application and on top, you can choose the way of product supply which best answers your individual manufacturing philosophy.  The delivery options include complete hose assemblies, hose/tube assemblies, single hose and fittings and hose crimpers and tooling for the Parkimp No-Skive self- assembling. 

    Learn more about Hose Products.


    Conny Stohr Hose Products Division Europe This blog was contributed to by Conny Stöhr, marketing services manager, Hose Products Division Europe.





    Other related topics on hydraulic hose, hose application, and selection criteria:

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    Selecting Hydraulic Hoses and Fittings Just Got Easier

    Top Ten Tips for Hydraulic Hose Routing


    Do You Know How Extreme Cold Affects Your Hydraulic Hose Properties?

    Extremely cold environments with conditions such as snow, ice and high wind speeds are a challenge for all rubber hydraulic...

    Read more

  • The Importance of Reinforcement in Hydraulic Hoses - Hose Reinforcement Options - Parker Hose Products DivisionSelecting the proper hose for a hydraulic assembly is critical to ensure that it meets the requirements for that specific application. One of the first steps in selecting the proper hose is to identify the type of reinforcement that is needed. The reinforcement is the strength of all hydraulic hoses; it determines the working pressure of the hose. Within the hydraulic hose industry, you will commonly see three types of reinforcement:

    1. Braided: a braid of synthetic textile, wire or other material, applied by high speed vertical or horizontal braiders
    2. Spiral: a spiral wrap that is made from natural fibers, synthetic materials or wire 
    3. Helical: a helical coil monofilament reinforcement that keeps the hose from collapsing in on itself when used in suction line applications

    Under Pressure: The Importance of Reinforcement in Hydraulic Hose - HoseFinder app - Parker HannifinDownload our HoseFinder app to make it easier to select your next hydraulic hose. 







    Hose reinforcement correlates to working pressure rating

    It is important to note that there are hoses that have a reinforcement that is a combination of fiber and wire, or multiple layers of wire braids or spiral layers but typically there are one or the other. Watch this video to see the differences. 


    Hose reinforcement has a direct correlation to the working pressure rating of a hydraulic hose. Pressure capacity is the defining criteria for hydraulic hose and pressure dictates how it is constructed. The type of reinforcement as well as the number of layers; 1-wire hose, 2-wire, 4-wire, etc., generally indicates pressure capacity. As you increase the number of layers, the pressure rating increases.  

    Hose reinforcement also impacts the flexibility of a hydraulic hose. Although hydraulic hoses are usually fairly stationary and don’t move around very much, hoses used on a piece of equipment that has a flexible joint, like a backhoe, must be flexible. Furthermore, the flexibility of hose enables components to be positioned in the most efficient or convenient places due to its ability to bend around corners, through tight spaces, or across long distances. Braided and spiral hoses definitely differ in terms of flexibility along with other differentiating factors.  

    Braided hydraulic hose

    The Importance of Reinforcement in Hydraulic Hoses - 487TC GlobalCore Hose - Parker Hose Products DivisionBraided construction has a crisscross wire arrangement. This ends up looking like a braid when it’s all done. Braided constructions allow for increased flexibility of the hydraulic hose. Several layers of wire braid can make the hose stronger while keeping the reinforcement material untangled and maintaining a constant pitch (i.e. the inclination and the thread count per unit length). "Medium-pressure hoses" typically feature one- and two-wire braided construction. These hoses are frequently found on construction equipment, heavy-duty trucks, and fleet vehicle applications. In general, braided hose is selected for its flexibility, however, this type of hose is also more susceptible to failure under high-impulse applications. 

    The Importance of Reinforcement in Hydraulic Hoses - Push-Lok Braided Hose - Parker Hose Products DivisionThe majority of "low-pressure braided hoses" have a textile reinforcement. In applications with typical operating pressures below 300 psi, the use of fiber braid allows for maximum flexibility. Hoses with textile reinforcement are commonly used to transmit petroleum-based fluids, diesel fuel, hot lubricating oil, air, ethylene glycol anti-freeze and water. 

    Below is an image of one of Parker Hose Product’s braiding machines. 

    The Importance of Reinforcement in Hydraulic Hoses - Parker Hose Braiding Machine - Parker Hose Products Division

    Spiral hydraulic hose

    At one time in the industry, two-wire braided hose was most commonly used in many applications. But the advent of larger, off-road specialty equipment drove the creation of spiral hose, which is very well suited for applications where extremely high impulse pressure is encountered.  

    The Importance of Reinforcement in Hydraulic Hoses - 722TC Spiral Hose - Parker Hose Products DivisionSpiral hose construction consists of either textile or wire reinforcement. Each ply is laid at a specified angle for maximum dimensional stability. Instead of crisscrossing, wires remain parallel as they wrap around the circumference of the hose. Even though spiral reinforcement results in a stronger hose; there is an increased minimum bend radius and less flexibility due to the stiffness of the wire reinforcement in most cases. Spiral wire construction was designed to handle the high impulse applications such as construction equipment, heavy-duty trucks and fleet vehicle applications. 

    Below is an image of one of Parker Hose Product’s spiral hose machines.

    The Importance of Reinforcement in Hydraulic Hoses - Parker Spiral Hose Machine - Parker Hose Products Division
    Usually the more layers of wire, the stronger the hose, which means higher pressures can be achieved. Multi-layer spiral hoses, such as four- or six-wire construction, are used in a wide variety of applications from lawn tractors to earth movers. The demand for durable, high-performance spiral hydraulic hoses is continually growing, especially in applications where service life is critical.

    The Importance of Reinforcement in Hydraulic Hoses - 881 Helical Wire Hose - Parker Hose Products DivisionHelical hydraulic hose

    Helical wire construction is used in addition to layers of fiber spiral or fiber braid hose reinforcements. Helical reinforced hoses are designed with maximum flexibility and vacuum handling in mind. The use of a helical reinforcement construction prevents collapse under vacuum. Helical wire reinforcement can be found in low pressure suction and return line hoses.

    Reinforcement is determined by the specific application requirements

    If you are in need of a hydraulic hose but don’t know which is best for your application, contact a local hose distributor. Provide them with all the details of your application in order for them to fully understand what you need. You can also download Parker’s HoseFinder to go through the STAMP process, which enables you to identify hoses based on your specific application. 

    From one- and two-wire braided, and up to six-wire spiral hose construction, and with a variety of cover options to protect from abrasive situations, Parker’s hydraulic hoses cover the pressure and media requirements for most hydraulic applications. 


    Kyri McDonough, Hose Products Division, Parker HannifinArticle contributed by Kyri McDonough, marketing services manager at Hose Products Division, Parker Hannifin.





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    Under Pressure: The Importance of Reinforcement in Hydraulic Hoses

    Selecting the proper hose for a hydraulic assembly is critical to ensure that it meets the requirements for that specific...

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  • How to Clean an Evaporator Coil - technicians working on AC unit - Parker SporlanWhen it’s time to provide your customer's preventive maintenance don’t forget to pay particular attention to system components that are out of sight within the system cabinet or air handler enclosure. The unit’s evaporator coils are among the more important of these hidden components. Problems can develop with dirty evaporator coils as it can effect the system's performance and efficiency. This can also lead to damage and/or breakdowns. Here is some basic information on effectively cleaning evaporator coils.


    Evaporator coils are probably the most difficult to clean. They are usually packed tightly inside a blower compartment that are usually difficult to service. They may be located over bathtubs, in tight dark closets, on rooftops in commercial applications, in a hot attic or a myriad of other places that are usually cramped, dark and uncomfortable. Due to these inconveniences, evaporator coils are often left alone and not cleaned until a system problem emerges. An evaporator coil should be inspected every six months and may need to be cleaned every six months to four years, depending on environment and filtration.

    Virginia Acti-KleanCleaning:

    Make sure to disconnect the power to the unit while cleaning the coil. This will prevent a potential electrical hazard. Disassemble the unit to the extent that both sides of the coil can be accessed. For applications that have matted hair and dirt on the intake side of the coil, it is important that they be carefully brushed clean. Failure to do so will severely limit the penetration of the coil cleaner and dramatically reduce its effectiveness. There are several disposable types of coil brushes available from different manufacturers that do a very good job of cleaning the surface dirt off while keeping your hands away from the filth and fins. One note of warning - the fins on a/c coils are very sharp and can cause severe cuts to skin. Be sure to avoid contact with the coil with your hands, arms, etc. It’s advisable to wear gloves, face mask and apron during this procedure since potential organisms growing on the coil and contact with lungs, skin, eyes or clothing may transmit disease. Once the surface dirt has been removed, a good evaporator coil cleaner, such as Acti-Klean should be mixed in a low pressure sprayer with water in a dilution ration of between 3:1 to 1:1, depending on the condition of the coil and the type of dirt encountered. Acti-Klean is a concentrated set of soaps and surfactants (wetting agents that help the cleaner penetrate the coil fully). The coil should then be sprayed liberally from both sides of the coil with the coil cleaner solution. This coil cleaner will not create the foam that condenser coil cleaners do, so don’t be shy applying the coil cleaner. Make sure that the liquid does not fall onto electrical components in the system. The cleaner will cut through grease and oils, as well as dislodge any dirt, dust and hair that may be trapped in the coil and rinses them down the condensate drain. An alternative option would be Virginia Coil Klean aerosol coil cleaner. This product will foam out dirt and dust and is certainly more convenient in the aerosol container, although it is more costly than cleaners like Acti-Klean. When the coil is clean, it is recommended that where possible the coil be rinsed off. This will aid in removing any remaining dirt from the coil. If this is not possible, then the condensate created by running the a/c system will rinse off any remaining cleaner. Depending on temperature and humidity conditions, the unit should run for between 15 minutes to 1 hour to ensure all cleaner is rinsed off the coil.


    In recent years, indoor air quality receives a lot of attention. Often a case of “black mold” in some air conditioning system is reported in the news and the entire building must be evacuated and sanitized. It is a good idea after cleaning the coil that an EPA registered bacteriostat be used on the coil and surrounding ductwork and insulation to ensure that any minor growths and odors are eliminated. Doing so provides your customer a valuable service by ensuring that mold and other growths do not develop throughout the system. It is important the technician pays close attention to the volume of dirt and other growths coming off the coil. It is not uncommon for release dirt to block the opening of the condensate drain line and restrict the draining of water. If this is observed, the blockage should be removed before the drain pan overflows.

    Drain Pan Treatment:

    While cleaning the coil, it is a good time to clean the drain pan as well. Simply clean out any rust and deposits that may be sitting in the bottom of the pan with a towel, rag or other means. Once again, be careful not to rub your hand across the coil as the edges are quite sharp. Protective gloves are recommended.

    For more information see Catalog G-1.

    HVACR Tech Tip: Coil Cleaning Basics for the HVACR Service Technician - Chris Reeves, Product Manager Contamination Control Products, Parker Hannifin Sporlan Division Article contributed by Chris Reeves, product manager, Contaminant Control Products, Sporlan Division of Parker Hannifin

    For more articles on climate control:

    HVACR Tech Tip: 12 Solutions for Fixing Common TEV Problems

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    HVACR Tech Tip: How to Clean Evaporator Coils for Preventive Maintenance

    When it’s time to provide your customer's preventive maintenance don’t forget to pay particular attention to system components...

    Read more

  • Next-Generation High-Temperature Flexible Hose Offers Unprecedented Reliability - High Temperature Flexible Hose - Parker AerospaceChallenged by the industry to advance the fire protection of hoses used in aircraft engine applications, engineers at the Parker Aerospace Stratoflex Products Division have used standard, low-cost materials to create a high-temperature flexible hose (HTFH) that redefines hose life expectancy. HTFH replaces traditional solutions, including both standard flexible hose and rigid pipe, to provide more durable fire protection, vibration damping, and thermal expansion flexibility to the feeder lines that supply the nozzles spraying fuel into the combustion chamber of jet engines.

    Current state: increased vibration, problematic technologies

    Vibration is a growing challenge for today’s engine manufacturers. While new lean-burn engines deliver a more complete combustion of fuel that results in lower NOx and particulate emissions, they can cause more vibration or rumble in the engine. Additionally, lighter and thinner components used to reduce engine weight are more susceptible to vibration. 

    Traditional technologies used to connect fuel manifolds to nozzles are problematic, even potentially dangerous:

    Next-Generation High-Temperature Flexible Hose Offers Unprecedented Reliability - Manifold - Parker Aerospace

    • A stainless-steel wire-reinforced polytetrafluoroethylene (PTFE) hose with a slip-over silicone sleeve and/or integral silicone fire sleeve, is a forty-year-old technology with a temperature limit of 450˚ F (232˚ C). While it provides good vibration damping, its temperature resistance is inadequate and its silicone cover is susceptible to thermal aging, requiring replacement in as little as five to ten years.
    • Rigid CRES or Inconel pipe is currently the technology most used due to its higher temperature rating of 1,200° F (650° C). However, the pipe is prone to high cycle fatigue vibration issues, resulting in limited life and replacement of the manifold. In addition, there are more stringent tolerance requirements associated with the precise and time-consuming manufacturing of the all-rigid manifold to ensure proper installation with the fuel nozzles and other manifold connections.
    High-temperature innovation: Parker HTFH

    Next-Generation High-Temperature Flexible Hose Offers Unprecedented Reliability - Manifold Closeup - Parker AerospaceOur high-temperature flexible hose is a win-win for engine manufacturers. With a temperature rating of 800°F for ambient conditions with minimal fuel flow of 0.07 gpm, the kink-resistant innovation has inherent damping capability, reducing vibration sensitivity. Plus, it is easier to install, less sensitive to tolerance stack up, offers equal fire-resistance performance to integral fire sleeve hose, and eliminates the problem of thermal aging of fire protection material.

    Constructed with a robust, stainless steel outer braid that is superior to a silicone fire sleeve for abrasion and chafing, HTFH has an insulating layer that acts as a fire sleeve. This insulating layer:

    • Withstands 1,800°F (982°C) continuous exposure and short-term exposure of up to 3,000°F (1,650°C).
    • Is used as thermal insulation in many applications.
    • Provides minimal shrinkage at higher temperatures.
    • Offers no evidence of abrasion after impulse or vibration.
    • Has low absorption of fluids.
    Next-Generation High-Temperature Flexible Hose Offers Unprecedented Reliability - HTFH Installation - Parker AerospaceConclusion

    The end result of this advanced engineering is a product that is much less costly to maintain due to ease of replacement and significantly longer service intervals, projected to be minimum of 15 years.

    Qualified in -4 and -5 sizes (1/4 inch and 5/16 inch diameters respectively) and adaptable to a wide variety of fitting styles and configurations, HTFH is redefining the market.

    For additional information on Parker Aerospace systems and capabilities, please visit our website.


    Next-Generation High-Temperature Flexible Hose Offers Unprecedented Reliability - HTFH Installation - Parker AerospaceThis post was contributed by Tracy Rice, strategic chief engineer – engines for Parker Aerospace Stratoflex Products Division.





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    Next-Generation High-Temperature Flexible Hose Offers Unprecedented Reliability

    Challenged by the industry to advance the fire protection of hoses used in aircraft engine applications, engineers at the...

    Read more

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    Parker Global publishes news from inside the company that focuses on our efforts to be a good corporate citizen around the world and illustrate our commitment to deliver on our brand promise to partner with our customers to increase their productivity and profitability.

    ParkerStore MRO Authority

    ParkerStore MRO Authority is your resource for the Maintenance, Repair and Overhaul space. Our goal is to improve your productivity and profitability with information on ParkerStore Service Points nearest you, Parker product and Technology Centers (Hydraulic, Pneumatic, Seal) updates, expert tips, troubleshooting, how-to articles and the latest industry news. We're ready to help you; not just with critical replacement parts, but solutions. And it's important those solutions are available where you are - onsite and off. If you know us already, you know that getting you back to work is our "thing". If you're not working with your local Distributor and ParkerStore, please read more.