초록 ▼

A fill valve includes a tubular housing which accommodates a valve member which is biased toward a closed position by a light spring. The valve member includes a head and a tubular portion which is provided with two large windows. When the fill valve is open fluid flows freely through the tubular po

A fill valve includes a tubular housing which accommodates a valve member which is biased toward a closed position by a light spring. The valve member includes a head and a tubular portion which is provided with two large windows. When the fill valve is open fluid flows freely through the tubular portion of the fill valve and out of the windows.

대표청구항 ▼

A fill valve for use in cementing operations in the construction of oil and gas wells, the fill valve comprising a tubular housing having a valve seat, a valve member slidably mounted in said tubular housing, spring means for biasing said valve member towards a closed position, said valve member com

A fill valve for use in cementing operations in the construction of oil and gas wells, the fill valve comprising a tubular housing having a valve seat, a valve member slidably mounted in said tubular housing, spring means for biasing said valve member towards a closed position, said valve member comprising a head engageable with said valve seat of said tubular housing to close the valve, a tubular portion and at least one window in said tubular portion so that fluid pumped through said tubular portion displaces said valve member relative to said tubular housing to open the fill valve and exit via said at least one window, and selectively releasable apparatus for releasably maintaining the fill valve in an open position.