Flapper valve
AssigneeCantex International, Inc.
InventorDuy D. Nguyen
Life of this patent
Estimating the term…
Abstract
Flapper valves may be provided in fluid transportation systems. The flapper valves comprise a body adapted for assembly into the system. The body comprises a first sub and a second sub which are removably assembled to each other. A passage is defined in the body which extends through the first and second subs. A seat is removably mounted in the passage. The seat is accessible by disassembling the first sub and the second sub. The valve also has a service port. A cap removably closes the port. A flapper is removably a mounted within the service port for pivoting movement between a closed position and an open position. In the closed position the flapper shuts off back flow through the passage. In the open position, the flapper allows fluid flow through the valve. The flapper is accessible by removing the cap from the service port.
Claims26
A flapper valve for fluid transportation systems, said flapper valve comprising:
- (a) a valve body adapted for assembly into said system, said body comprising a first sub and a second sub removably assembled to each other;
- (b) a passage defined in said body and extending through said first and second subs, said passage being adapted to conduct fluids transported through said system;
- (c) a seat removably mounted in said passage, said seat being accessible for replacement only by disassembling said first sub and said second sub;
- (d) a service port and a cap removably closing said port;
- (e) a flapper removably mounted within said service port for pivoting movement between a closed position, in which said flapper bears on said seat and shuts off back flow through said passage, and an open position, in which said flapper is pivoted away from said seat and allows fluid flow through said valve;
- said flapper being accessible for replacement only by removing said cap from said service port.
A flapper valve for fluid transportation systems, said flapper valve comprising:
- (a) a valve body adapted for assembly into said system;
- (b) a passage defined in said body adapted to conduct fluids transported through said system;
- (c) a seat;
- (d) a flapper mounted for pivoting movement between a closed position, in which said flapper bears on said seat and shuts off back flow through said passage, and an open position, in which said flapper is pivoted away from said seat and allows fluid flow through said valve;
- (e) a service port and a cap removably closing said port, said cap having a skirt depending therefrom and extending downward into said port, said skirt defining a blind chamber within said cap, said cap having a continuous inner surface enclosing said blind chamber;
- (f) a filler body disposed within said chamber in said cap and occupying substantially the entire volume of said chamber, wherein clearances are provided between said filler body and said chamber, said clearances allowing said cap skirt to be energized radially outward by fluid flowing through said valve.
Dependencies are inferred from the claim text.