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High Reliability, Minimum Plug Force Water Couplings Through Redundant Seals on all Sliding Surfaces of SMC KKA-Series Couplings

IP.com Disclosure Number: IPCOM000223114D
Publication Date: 2012-Nov-05
Document File: 2 page(s) / 89K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method to prevent water leaks in couplings by adding a redundant seal on all non-static coupling surfaces.

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This is the abbreviated version, containing approximately 51% of the total text.

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High Reliability, Minimum Plug Force Water Couplings Through Redundant Seals on all Sliding Surfaces of SMC KKA-Series Couplings

Minimum plug force water couplings of the SMC* KKA-series type employ lightweight springs and single rubber O-ring seals. Multiple leak defects have been experienced on some products. For example, a leak path was created by water debris bridging a particular O-ring seal, which led to replacement of that machine. In addition, multiple leaks were found on another machine's return manifolds, created by build-process side forces put onto uncoupled sockets, resulting in negative compression of the seal. This has led to many manifold replacements on that product. Both examples occur because single seals on low plug force coupling designs can be compromised for various reasons and result in water leaks.

Known solutions have been created, and exist for specific leak causes; examples such as filtering of system water to prevent debris from getting onto seal surfaces, or design changes of internal mechanisms to allow internal mechanism movement to correct seal compression problems, have helped improve reliability, but cannot guarantee leak-free operation through the life of this type of coupling. Seal damage of single-seal coupling designs (due to poor handling, or high plug applications) has also been discovered in some product application testing.

The solution proposed by this invention is to add a redundant seal on all non-static coupling surfaces (i.e., surfaces which move against, or relative to one another, such as sliding surfaces), th...