Double Valve Block and Actuator Assembly Including Same

A system for drilling a subsea wellbore, the system comprising:

• a blowout preventor comprising a main bore and a pair of opposed rams, each ram having an open position withdrawn from the main bore and a closed position extending into the main bore;
• and
• a valve configured to facilitate actuation of the rams, the valve comprising:
• a housing having a longitudinal axis and including a first chamber, a second chamber, and a neutral chamber positioned axially between the first chamber and the second chamber;
• a first valve member at least partially disposed in the first chamber, wherein the first valve member has a closed position seated in a first annular valve seat and an open position spaced apart from the first valve seat;
• and
• a second valve member at least partially disposed in the second chamber, wherein the second valve member has a closed position seated in a second annular valve seat and an open position spaced apart from the second valve seat.