초록 ▼

A ball valve comprising a housing having inlet and outlet ports provided a fluid passageway therethrough, a rotatable closure member disposed within the housing and interposed between the inlet and outlet ports for providing alternate open and closed positions for the valve, a rotatable valve stem s

A ball valve comprising a housing having inlet and outlet ports provided a fluid passageway therethrough, a rotatable closure member disposed within the housing and interposed between the inlet and outlet ports for providing alternate open and closed positions for the valve, a rotatable valve stem secured to the closure member for moving the closure member between the open and closed positions therefor, a valve seat removably secured to the housing and engagable by the closure member in the closed position thereof, and a removable sealing member provided for the valve seat to substantially preclude leakage of fluid around the closure member in the closed position of the valve.

대표청구항 ▼

A ball valve comprising a valve body for removable installation between a pair of substantially identical oppositely disposed flanged fittings and having a fluid passageway extending therethrough, sectional valve seat means removably secured on the valve body coterminous with one end of the fluid pa

A ball valve comprising a valve body for removable installation between a pair of substantially identical oppositely disposed flanged fittings and having a fluid passageway extending therethrough, sectional valve seat means removably secured on the valve body coterminous with one end of the fluid passageway, a rotatable closure means disposed in the fluid passageway and having the outer periphery thereof in constant engagement with the valve seat means, said closure means having fluid passageway means for alignment with the fluid passageway of the valve body in one position of the closure means for providing an open position for the valve and having a closed end for alignment with the fluid passageway of the valve body in another position of the closure member for providing a closed position for the valve, and seal means removably secured between the sections of said valve seat means whereby the closure means engages the valve seat means both upstream and downstream of the seal means in the closed position of the valve and only outside of the seal means in the open position of the valve.