port 34 which connects to the hose 32 on the open side of the operating system a bop port 42 connects to the hose 30 or directly to the open port 28 a vent port 44 is connected to conduits which are vented to sea 0036 fig4 is a section view of the dump valve 10 in the vent position in this position fluid moves from the open chamber 24 through the valve 10 and is vented to sea when the shuttle 36 is in the vent position fluid flows through the dump valve 10 as shown by the flow arrows in the drawing fluid enters the dump valve 10 through the bop port 42 and exits through the vent port 44 as shown by the flow arrows the body 46 has a longitudinal bore that is threaded to receive the supply adapter 48 and the bop adapter 50 an o ring 52 is positioned in channel 51 and between the body 46 and the bop adapter 50 thus creating a seal between these two components another o ring 54 is positioned between the supply adapter 48 and the body 46 to create a seal between these two components the body also has a transverse bore which forms the vent port 44 and which connects to the longitudinal bore the shuttle 36 has a central.