Retrofit second packing chamber for quarter-turn valves
OwnerBarry S. Pakulainventor
Life of this patent
Estimating the term…
Abstract
A retrofit second packing chamber for quarter-turn valves that permits existing valves to be modified so as to meet modern emission standards without requiring replacement of the valves, and which can be assembled to existing valves in a simple, efficient manner at reasonable cost. The retrofit second packing chamber comprises an assembly which defines a second packing chamber to be assembled to the existing first packing chamber of a valve in series therewith so as to substantially increase the protection against undesired emissions from the valve.
Claims16
A retrofit second packing chamber for quarter-turn valves, said retrofit second packing chamber comprising a unit that can be fitted to existing quarter-turn valves of any of various types and sizes which include an existing packing chamber having an existing compression packing type sealing device therein, said retrofit second packing chamber comprising:
- a retrofit body having a bore extending therethrough for receiving a valve stem mechanism and for defining a retrofit packing chamber having a compression packing type sealing device for sealing between an internal wall of said retrofit body and said valve stem mechanism extending through said bore;
- and
- means for mounting said retrofit body to a body of the existing packing chamber of the existing quarter-turn valve so that the existing packing chamber of said existing quarter-turn valve and the retrofit packing chamber of said retrofit body are arranged in series.
A retrofitted valve system comprising:
- (a) a quarter-turn valve, said quarter-turn valve comprising an existing quarter-turn valve of any of various types and sizes including:
- a valve body having an inlet port and an outlet port;
- a valve mechanism for preventing or permitting the flow of fluid through said valve body from said inlet port to said outlet port;
- a valve stem coupled to said valve mechanism and extending out of said valve body for operating said valve mechanism;
- and
- a valve stem sealing system for sealing around said valve stem for preventing leakage from the valve body, said valve stem sealing system including a first packing chamber having a first compression packing type sealing device therein for sealing around said valve stem;
- and
- (b) a retrofit second packing chamber assembly assembled to said existing quarter-turn valve to define a retrofit second packing chamber having a second compression packing type sealing device therein arranged in series with said first packing chamber of said existing quarter-turn valve.
Dependencies are inferred from the claim text.