Control Module With Dual Ball Valve Assemblies

Abstract

A subsea control system may have a control module having a plurality of dual ball valve assemblies. Each dual ball valve assembly may be connected to a supply line, a vent line, and a function line connected to a subsea device for controlling the subsea device.

1 . A subsea control system, comprising:
 a control module having a plurality of dual ball valve assemblies, each dual ball valve assembly connected to a supply line, a vent line, and a function line connected to a subsea device for controlling said subsea device.   
     
     
         2 . The subsea control system of  claim 1 , wherein the plurality of dual ball valve assemblies are connected to a single supply line and a single vent line, wherein each dual ball valve assembly is connected to a different function line, and wherein each function line is connected to a different subsea device. 
     
     
         3 . The subsea control system of  claim 1 , wherein at least one of the plurality of dual ball valve assemblies comprises:
 a first ball valve; and   a second ball valve.   
     
     
         4 . The subsea control system of  claim 3 :
 wherein the first ball valve is connected to the supply line and controls flow from the supply line through the dual ball valve assembly into the function line; and   wherein the second ball valve is connected to the vent line and controls flow from the function line through the dual ball valve assembly into the vent line.   
     
     
         5 . The subsea control system of  claim 3 , wherein the dual ball valve assembly comprises a dual motor configured to actuate the first ball valve and the second ball valve. 
     
     
         6 . The subsea control system of  claim 1 , comprising:
 a pressure transducer associated with at least one of the plurality of dual ball valve assemblies and configured to indicate whether the dual ball valve assembly is in a block position, whereby flow is prevented through the dual ball valve assembly;   wherein the subsea control system has a leak detection mode that utilizes data from the pressure transducer to detect leaks.   
     
     
         7 . The subsea control system of  claim 1 , wherein at least one of the plurality of dual ball valve assemblies is modular. 
     
     
         8 . The subsea control system of  claim 1 , wherein each of the plurality of dual ball valve assemblies has a supply position, a vent position, and a block position;
 wherein the supply position permits flow from the supply line, through the dual ball valve assembly, into the function line, and prevents flow to the vent line;   wherein the vent position permits flow from the function line, through the dual ball valve assembly, into the vent line, and prevents flow from the supply line; and   wherein the block position prevents flow through the dual ball valve assembly.   
     
     
         9 . The subsea control system of  claim 1 , wherein at least one dual ball valve assembly has a failsafe position. 
     
     
         10 . The subsea control system of  claim 9 , wherein the failsafe position is a vent position that permits flow from the function line, through the dual ball valve assembly, into the vent line, and prevents flow from the supply line. 
     
     
         11 . The subsea control system of  claim 10 , wherein the failsafe position is mechanically biased. 
     
     
         12 . A control module comprising:
 a plurality of dual ball valve assemblies; and   electronics configured to control the plurality of dual ball valve assemblies;   wherein each of the plurality of dual ball valve assemblies comprises a supply manifold, a vent manifold, and a function port.   
     
     
         13 . The control module of  claim 12 , wherein the electronics are configured to control at least one dual motor to actuate at least one of the plurality of dual ball valve assemblies. 
     
     
         14 . The control module of  claim 12 , comprising an accumulator connected to each of the supply manifolds via a supply line. 
     
     
         15 . The control module of  claim 12 , comprising a vent connected to each of the vent manifolds via a vent line. 
     
     
         16 . The control module of  claim 12 , comprising a subsea device connected to at least one of the function ports via a function line. 
     
     
         17 . The control module of  claim 12 , comprising a latchdown assembly. 
     
     
         18 . The control module of  claim 12 , comprising a filter. 
     
     
         19 . A subsea control system comprising:
 a control module having a plurality of dual ball valve assemblies which control a plurality of subsea functions.