shown. the type of valve with the disc attached to the spindle is of the screw lift type. when the disc is not attached to the spindle (inset figure ) it is a screw-down non-return (sdnr) valve, as used for bilge systems, to prevent back flooding. they are also used as feed check and boiler stop valves...
shown. the type of valve with the disc attached to the spindle is of the screw lift type. when the disc is not attached to the spindle (inset figure ) it is a screw-down non-return (sdnr) valve, as used for bilge systems, to prevent back flooding. they are also used as feed check and boiler stop valves...
shown. the type of valve with the disc attached to the spindle is of the screw lift type. when the disc is not attached to the spindle (inset figure ) it is a screw-down non-return (sdnr) valve, as used for bilge systems, to prevent back flooding. they are also used as feed check and boiler stop valves...