Control valve station

Dear friends,

       I am santharam. I am working as Piping Engineer. I am having some doubts in control station. Consider a control station which is 500mm from the ground level. Both the gate valves are present at both the sides of control valve. In some cases the bypass valve is placed parallely above the control valve & in some other cases it is placed at 45 degrees vertical to the control valve. why is it so? Received on Thu Feb 21 00:02:00 2008