The pilot valves are located in control pods on the BOP stack. In order to provide a complete back-up of the subsea equipment there are two control pods - usually referred to as the blue and the yellow pods.
No attempt is made to recover the hydraulic power fluid once it has been used to operate a function since this would increase the number of lines required in the umbilical. Instead the fluid is vented subsea from the control pod.
SECTION 9 : SUBSEA BOP CONTROL SYSTEMS & MARINE RISER SYSTEMS
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