bop rams the open chamber 24 connects to an open port 28 which connects to a short conduit 30 which connects to the quick dump valve 10 alternatively the dump valve 10 can be directly connected to the open port 28 additional hoses 32 connect the dump valve 10 to one of three ports on the shuttle valve generally identified by the numeral 35 the other two ports on the shuttle valve 35 connect to the blue pod and the yellow pod hydraulic supply as well known to those skilled in the art when either the blue pod accumulators or the yellow pod accumulators are energizedwhen hydraulic fluid is directed from either the blue or yellow pods the shuttle valve 35 seals off the path of the non energized hydraulic system and routes the fluid to the bop in order to open the rams as shown in fig1 high pressure fluid exits from a pod in this case the yellow pod and moves through the shuttle valve 12 the conduit 14 the close port 16 and enters the close chamber 22 thus moving the piston 20 to the left hand side of the bop assembly 18 as shown in fig1 as high pressure fluid enters the close chamber 22 fluid must exit the open chamber 24 as the piston 20 moves to the closed position the fluid in the open chamber 24 moves into the dump valve 10 shifting it to the vent position fig4 thus venting the fluid to sea during the closing process fluid is being vented through the dump valve 10 after the bop is closed the pressure in the close chamber 24 equalizes and no further fluid is vented however the shuttle.