Manually operated tank valve

Abstract

The present invention provides a valve apparatus comprising a conduit, including a first port, a second port, and a third port, a piston sealingly disposed within the conduit, including a first piston aperture and a second piston aperture, a piston valve configured to seal the second port, and a bore, extending from the first piston aperture to the second piston aperture, and configured to facilitate communication between the first port and the second port, and a valve, disposed within the conduit, and configured to seal the third port. The present invention further provides a valve apparatus comprising, a conduit, including a first port, a second port, a third port, a first sealing surface disposed between the first port and the second port, and a second sealing surface disposed between the second port and the third port, a piston sealingly disposed within the conduit, including a first piston aperture and a second piston aperture, a first piston valve surface configured to seal the first sealing surface, a second piston valve surface configured to seal the second sealing surface, and a bore, extending from the first piston aperture to the second piston aperture, and configured to facilitate communication between the first port and the third port, and a valve, disposed within the conduit, and configured to seal the second piston aperture to thereby seal the third port. The present invention further provides a valve apparatus comprising a conduit, including a first port, a second port, a third port, and a radially extending shoulder, a piston sealingly disposed within the conduit, including a first piston aperture and a second piston aperture, a piston valve configured to seal the second port, and a bore, extending from the first piston aperture to the second piston aperture and configured to facilitate communication between the first port and the third port, a valve, disposed within the conduit, and configured to seal the third port, and a resilient member, urging the piston to a position whereby the second port is unsealed.

Dependencies are inferred from the claim text.