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finish topography is optimized in order to satisfy performance requirements. The severe service profiles of both commercial and military aircraft have been evaluated in the product test laboratory, resulting in recommendations for HVOF surface finish topography applicable to the hydraulic fluids used in both applications, phosphate ester and the mineral-based red oils.
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An injection-moulding machine has been developed that uses a seal on the stem of the valve pin to prevent leakage of molten material.
## and Mahle Metal Leve S.A. Brasil The invention relates to steel or cast iron piston rings with a coating of chromium nitride deposited by a physical vapour deposition on the sliding surface. The coating is composed of a columnar crystal structure of CrN with an oxygen content in solid solution
## Tenaris Connections AG, Switzerland A further variation of the threaded joint for oil and gas pipes is described. It creates a metalto-metal seal externally to the female thread. The joint has an extension of the box beyond the seal, which produces an elastic tightening band effect on the seal