Check valve having a state indication system

A method for a check valve disposed within a fluid path, the check valve comprising:

• a housing;
• a poppet retained within the housing;
• and
• a state indication system operatively coupled to the poppet, wherein the state indication system is configured to provide an indication of a first operational state of the check valve, and a second operational state of the check valve,
• the method comprising:
• providing, by the state indication system, an indication of the first operational state of the check valve;
• and
• providing, by the state indication system, an indication of the second operational state of the check valve.

A system comprising:

• a fluid path;
• and
• a check valve disposed within a fluid path, the check valve comprising:
• a housing;
• a poppet retained within a passage of the housing, wherein the poppet is retained within a passage of the housing, and wherein the poppet comprises a head, and a stem extending from the head, wherein the stem comprises a main shaft connected to a cam surface, wherein the cam surface connects to a groove;
• a spring connected to a spring-retaining foot of the poppet;
• an end cap, wherein the spring is disposed between the end cap and the spring-retaining foot;
• and
• a state indication system operatively coupled to the poppet, wherein the state indication system is configured to provide an indication of a first operational state of the check valve, and a second operational state of the check valve.