High pressure gate valve with preloaded, stacked, solid lubricated stem seals
CA 1113914 A · Owner: Mcevoy Oilfield Equipment Company · Inventors: Herd, David P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A high pressure gate valve having at least one pressure actuated seal means between the bonnet part of the valve body and the valve actuating stem and between the chamber part of the valve body and the valve actuating stem is disclosed. Each seal means includes at least one seal assembly. Each seal assembly includes two sets of plural, e.g. four metal rings with an, elevated temperature resistant and chemical resistant ring of solid lubricant, e.g. tetrafluoroethylene or graphite separating, the metal rings. Each metal ring is softer than the stem and is of rectangular cross-section. The seal assembly is actuated by pressure on larger follower metal rings. When multiple seal means are …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted December 8, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 8, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.