Abstract: A modified valve (10) comprises a body (11) having first (18), second (19), third (21) and fourth (23) connectors. The first (18) and second connectors (19) are each adapted for connection to a respective element of a fluid circulation system. A ball valve member (30) is enclosed internally within the body (11) and is arranged for selective rotation between a range of positions. First (31), second (32) and third (33) apertures are provided in the ball valve member (30) and arranged in a configuration so as selectively to permit fluid communication between at least two of said first (18), second (19) and third (21) connectors in each of said range of positions of the ball valve member (30). The ball valve member (30) further comprises a conduit (35) to permit fluid communication between said fourth connector (23) and at least two of said first (18), second (19) and third (21) connectors in each of said range of positions of the ball valve member (30).

Abstract: A boiler service and maintenance valve (20) comprises a body (21) having a first connector (28), a second connector (29), and a separate flush entrance (31). Each of the first connector (28) and the second connector (29) is adapted for connection to a conduit of a water heating system (60). The body (21) further comprises a valve member (47) arranged for movement between at least a first open position for opening the flush entrance (31) and a closed position for closing the flush entrance (31). The first open position allows fluid communication between the flush entrance (31) and at least one of the first connector (28) and the second connector (29). The closed position allows fluid communication between the first connector (29) and the second connector (29), but not the flush entrance (31).