Patent ID: 7878252

Claim:
A control system for operating a sub-surface safety valve, comprising: a first control line assembly in fluid communication with a control port of the sub-surface safety valve; a second control line assembly in fluid communication with the control port of the sub-surface safety valve; and a valve interconnecting the first and second control line assemblies, the valve allowing fluid communication from the first control line assembly to the control port and preventing fluid communication from the second control line assembly to the first control line assembly, wherein operated in a first mode, the control system communicates control fluid to the sub-surface safety valve via the first control line assembly to open the sub-surface safety valve and exhausts the control fluid from the sub-surface safety valve via the second control line assembly to close the sub-surface safety valve, and wherein operated in a second mode, the control system communicates the control fluid to the sub-surface safety valve via the second control line assembly to open the sub-surface safety valve.