Abstract: A system includes a set of valves and a handle, in which one valve in the set of valves is to be open at one time, and the handle is configured to move the valve between an open position and a closed position. The handle is configured to engage and disengage with the valve only when the valve is in the closed position such that the handle is not removed from the valve when the valve is in the open position. Thus, the system facilitates the sequential opening of valves in a set of valves by generally allowing a limited number of valves to be open at one time.

Abstract: A system includes a set of valves and a handle, in which one valve in the set of valves is to be open at one time, and the handle is configured to move the valve between an open position and a closed position. The handle is configured to engage and disengage with the valve only when the valve is in the closed position such that the handle is not removed from the valve when the valve is in the open position. Thus, the system facilitates the sequential opening of valves in a set of valves by generally allowing a limited number of valves to be open at one time.

Abstract: This control device for a valve comprises a head (5) designed to fit onto a corresponding control rod (T) of the valve and a handle (3) that can be operated manually by a user to angularly move the head and control rod between a first angular closed position of the valve and a second angular open position of the valve. The head comprises locking apparatuses (9, 10) designed to cooperate with complementary locking apparatuses (13) provided on a raised extension (11) the valve and capable of preventing the release of the handle (3) and of the head (5) from the first angular closed position of the valve.