Control valve systems and methods for blowout of sand separation device and high integrity pressure protection

A control valve system, comprising:

• a first valve assembly positioned upstream of and in fluid communication with a second valve assembly, the second valve assembly being positioned upstream of and in fluid communication with a third valve assembly;
• the first valve assembly comprising:
• a first valve actuator comprising a piston coupled to a gate valve of a first valve via a piston rod to move the gate valve between an open positon and a closed position to open and close fluid flow through the first valve;
• the second valve assembly comprising:
• a second valve actuator comprising a piston coupled to a gate valve of a second valve via a piston rod to move the gate valve between an open positon and a closed position to open and close fluid flow through the second valve;
• and
• the third valve assembly comprising:
• a third valve actuator comprising a piston coupled to a gate valve of a third valve via a piston rod to move the gate valve between an open positon and a closed position, wherein the gate valve of the third valve has a choke port to allow fluid flow through the third valve when in the closed position.

A method of closing fluid flow through a high integrity pressure protection system, comprising:

• monitoring a fluid pressure in a fluid line;
• detecting an over pressurization of fluid in the fluid line;
• closing a primary valve of the high integrity pressure protection system in response to detecting the over pressurization of fluid in the fluid line;
• closing at least one secondary valve of the high integrity pressure protection system in response to detecting the closing of the primary valve;
• opening the at least one secondary valve when the fluid pressure in the fluid line is below an acceptable level;
• and then
• opening the primary valve in response to detecting opening of the at least one secondary valve.