Each subsea control pod contains two regulators — one to regulate pressure for the manifold and one to regulate the pressure for operating the annular preventers. Some control systems incorporate a third regulator so that the operating pressure of each annular preventer can be individually manipulated.

Typical regulators are 1 V2" hydraulically operated, stainless steel, regulating and reducing valves. As shown in Figure 61 the output line of each regulator is tapped and the pressure routed back to a surface gauge through the umbilical. This readback pressure is used to confirm that the susbsea regulator is supplying the power fluid at the pressure set by the pilot surface regulator.

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