Gate valve having a secondary seal
CA 1260908 A · Owner: Beson, John · Inventors: Beson, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A gate valve 10 is disclosed having a secondary seal wherein the, gate 15 forms a metal to metal seal with the seat 29 128 and, wherein a resilient seal 36a is moved toward the gate 15 in a closed position to form a secondary fluid-tight seal with the gate 15. A device 31 34 for deenergizing the secondary seal is provided in order to prevent wear of the secondary seal upon opening of the gate and also to reduce the gate 15 drag caused by the energized secondary seal. Also disclosed is a pressure relief mechanism 40 141 for the, secondary seal adapted to prevent damage to the seal and a mechanism for evenly applying opposing secondary seals.
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 September 26, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 26, 2006.
- 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.