Abstract: Systems, devices and methods for regulating pressure in a blowout preventer (BOP) of a subsea well assembly. A closed loop regulator (CLR) that combines the functions of a pressure relieving valve and a pressure reducing valve into one body to control the pressure of a hydraulic circuit or a BOP mux control pod. A closed loop servo valve controlled proportional electrohydraulic reducing valve is used to allow continual variation of the pressure set point for the downstream circuit. If the downstream pressure exceeds the set point by a predetermined amount, the pressure relieving valve vents the pressure to the reservoir or atmosphere.

Abstract: A system, in certain embodiments, includes a lip seal having an outer diameter portion including an outer protrusion configured to contact a first seal interface, wherein the protrusion has a curved surface.

Abstract: Retrievable sub-pods for use in a blowout preventer (BOP) stack, including systems of sub-pods and methods for use, are disclosed. The sub-pod includes a valve assembly, wherein the valve assembly includes a solenoid, an electronics interface, and a directional control valve. The sub-pod further includes a modular valve pack and a controller, wherein the modular valve pack comprises a manifold, and wherein the manifold is operable to support the valve assembly within the manifold.

Abstract: A system, in certain embodiments, includes a lip seal having an outer diameter portion including an outer protrusion configured to contact a first seal interface, wherein the protrusion has a curved surface.