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Design factors for satellite, high altitude, and space-based applications vary dramatically from those of land or ship-based programs. These factors include: low payload capacity, low operating temperature, and meeting material limits.
Outgassing standards, established by NASA, set a limit on the release of gasses that can possibly interfere with sensitive technology within vacuum environments such as Low Earth Orbit (LEO). This is especially important for sensitive optical systems or camera lenses where the smallest bit of vapor or gaseous components can dramatically reduce performance.
Test and metrics
NASA outgassing requirements are often used interchangeably with ASTM E595 which establishes the test method for determining outgassing levels. During the E595 test, small samples of material are kept under vacuum and heated to 125°C for a 24-hour period. While the samples are heated, all gasses are channeled through a single release port where a chromium-plated disk is used to collect the volatile materials.
After the test, there are two key metrics that are collected and used in certifying a material to NASA Outgassing Standards.
While NASA does keep an extensive database of all materials that they have tested in house, certified labs often run ASTM E595 testing as well. For a complete list of Parker Chomerics products that pass traditional outgassing requirements (and associated NASA Data Reference Numbers), please see: Parker Chomerics NASA Outgassing Information.
Outgassing in EMI shielding solutions
The most common materials to release stored vapors and gasses are sealants, adhesives, and less heavily crosslinked elastomers and polymers. Conversely, metals and glasses with few impurities tend to have a very low level of outgassing.
While often true, many conductive elastomers made of silicone and fluorosilicone can meet these standards due to high quality raw materials and efficient processing.
General trends for outgassing in EMI Shielding:
Steps can be taken to reduce the amount of vapor or gasses that are released by materials. One such example is known as post-baking, sometimes referred to bake-off or bake-out. This process involves baking materials at elevated temperatures (and sometimes in vacuum environments) after they have been manufactured in order to lower vapor and/or volatile compounds.
It is important to note that some materials that pass NASA outgassing standards are only able to do so after post-baking for some amount of time. It is possible that some NASA post-baking occurred at temperatures above the maximum recommended operating temperature of these materials. This elevated temperature exposure can change the physical, thermal, or electrical properties of tested materials.
Parker Chomerics has a long history of supplying manufacturers with outgassing-compliant solutions to EMI Shielding problems for vacuum and space-based. For a complete list of Parker Chomerics products that pass NASA outgassing requirements (and associated NASA Data Reference Numbers) and more information, please see: Parker Chomerics NASA Outgassing Information.
This blog contributed by Ben Nudelman, market development engineer, Chomerics Division.
7 Apr 2020
The performance of heavy equipment and machinery is dependent on the reliability of every component. Whether in the factory or out in the field, the failure of a single mechanical element means downtime for repair or replacement. If the fix requires connecting or disconnecting hydraulic lines under pressure—and without fluid loss—rendering the machine operational presents unique challenges. The solution? Screw-to-connect quick couplings.
Putting trust in strong and reliable coupling connections even under the most demanding conditions is vital to improved performance and the prevention of unnecessary maintenance. Parker’s screw-to-connect couplings are engineered to take the pressure and make even the most demanding applications manageable.Screw-to-connect couplings
Parker has developed two coupling products that are changing the industry standard for reliability, ease of connection and safety: the FET Series and the 59 Series. Designed and built for use in high-pressure, high-impulse applications requiring secure, easy connection and the ability to connect and disconnect under pressure, these screw-to-connect couplers far outperform any standard coupler on the market today. Standard couplers are difficult to connect or disconnect if trapped pressure is present, so operators must first shut down their equipment to release all system pressure, which leads to undesired downtime in the field.
Screw-to-connect couplers thread together easily while under pressure by securely releasing oil and transporting it to an internal chamber. This allows for connections with pressure on both / either the nipple and coupler side up to 5,000 psi. Manufactured from high-grade materials with a durable design and stainless-steel valve, the FET Series is interchangeable with other similar thread-to-connect couplers with superior impulse resistance.
Let’s take a closer look at both of these products. FET series
Designed to provide interchangeability with similar high-pressure thread-to-connect couplings by other manufacturers, FET Series features include non-spill valves, durability and high impulse resistance. Plus, they require only seven turns of the threaded sleeve to provide a full connection.59 series
Parker's 59 Series is the premiere thread-to-connect coupling for high impulse hydraulic applications. The rugged Acme threads are resistant to damage and have a double-start feature to quickly align the threads, which saves valuable time. As few as 2 ½ sleeve rotations will complete a full connection. The 59 Series features an integrated swivel function on the coupler body which eases the frustration of dealing with hose twist while under pressure. The Parker 59 Series is uniquely engineered to provide a faster, cleaner and easier connection for any heavy-duty application.
This coupler offers additional advantages such as the bright orange O-ring which is concealed by the sleeve when connected; you can also feel when the coupler and nipple are fully mated, giving both a visual and tactile confirmation of a secure connection. Truly engineered to perform, the 59 Series has an internal bearing to reduce hose twist and facilitate connection to pressurized fluid lines.
Working under pressure
Parker has redefined the phrase “working under pressure” by developing reliable, high-pressure couplers that enhance performance across a multitude of industrial applications with the added benefits of safety, reliability and easy installation.
Watch our video to learn more about connecting under pressure.
Learn more here about Parker’s Screw-to-connect solutions.
Parker’s screw-to-connect couplings are available for purchase on www.parker.com. Simply add products to your cart for shipment within two days for in-stock items.
Article contributed by Lori Aus, senior product sales manager, Quick Coupling Division, Parker Hannifin.
7 Apr 2020
For medical device manufacturers, it is now more important than ever to operate at the highest capacity in order to increase the supply of essential equipment used for patient care.
COVID-19 is stressing healthcare resources around the world. It is imperative that we all do whatever we can to assist those on the front lines to stay healthy as they care for those who are sick.Shared responsibility
OEMs require their procurement and manufacturing to operate at peak efficiency to meet today’s business-critical challenges that demand:
To achieve this, medical device manufacturers need a partner with a long history of performance and experience in the medical industry and related, regulated markets — a partner that has supported customers in times of crisis around the world, who can scale to meet urgent needs swiftly and efficiently.
Parker is ready to provide emergency manufacturing support to help our customers produce vital medical equipment.
Parker is making medical device-related orders a top priority to support our manufacturing partners through this crisis.
Throughout our 103-year history, Parker has been called upon in times of global hardship and adversity. Our leadership and perseverance in these defining moments demonstrates how we live our purpose: Enabling Engineering Breakthroughs that Lead to a Better Tomorrow.
— Tom Williams, CEO Parker Hannifin
With 30+ years of medical industry experience, and more than 100 years of engineering leadership, you can count on Parker to provide support through these challenging times with capabilities that include:
From capnography monitors to infusion pumps, pulse oximetry devices, ventilators and hospital beds, Parker offers a wide range of critical systems and components to address medical device manufacturers’ needs. Including:
Miniature solenoid valves – auto zero or calibration valves switch sensor to atmosphere for automatic re-calibration of pressure transducers.
Check valves – prevent reverse flow.
Proportional valves – proportionally control gas flow rates.
Pressure relief valves – prevent over-pressurization of lines.
EMI shielding – optically enhanced display screens, conductive elastomers, coatings, plastics, and foil laminates.
Sealing – Parker o-rings are manufactured according to metric and imperial international standards such as AS 568B, DIN ISO 3601 and JIS. Custom sizes of almost any dimension are possible.
Parker's comprehensive range of fittings and quick couplings offer reliable, proven, leak-free connections for critical healthcare applications.
Fittings — an unparalleled selection of fittings across a variety of materials, delivering higher productivity and increased efficiencies.
Quick couplings — Parker is the largest quick coupling manufacturer in the world, providing quick disconnects and accessories for use where hoses and fluid lines are connected and disconnected.
Polyethylene (PE) tubing — produced from resins that provide increased dimensional stability, uniformity and long-term strength. Laboratory grade options with FDA, NSF-51 and NSF-61 compliance.
Polyurethane tubing — offers excellent flexibility and outstanding use in a wide range of applications and allows for 50% space reduction compared to nylon tubing.
Fluoropolymer (FEP) tubing — is a robust engineering fluoropolymer that provides excellent fluid visibility and is ideal for flow control monitoring.
Medical device manufacturers are under immense production challenges, and Parker is ready to help by expanding the production of critical filtration, sealing and shielding, and fluid and gas handling technologies and prioritizing orders to help our customers produce life-saving equipment as quickly and efficiently as possible.
This blog was contributed by the Parker Global Life Science Team.
7 Apr 2020