CHEMICAL INJECTION CHECK VALVE INCORPORATED INTO A TUBING RETRIEVABLE SAFETY VALVE
Disclosed herein is a safety valve with a chemical injection configuration. The device includes a hydraulic fluid pressure operated piston (12) at the housing. The device further includes a flow tube (64) in operable communication with the piston (12) and a chemical injection configuration disposed within the housing. Further disclosed herein is a method of maintaining the operation of a safety valve by injecting chemical fluid through a configuration within the safety valve. Still further disclosed herein is check valve (36, 38). The check valve includes a seal, a dart having a closed head and sealable against the seal, one or more flutes on the dart, and a spring applying a biasing force to the dart to a sealing position, that force being overcomeable by a fluid pressure acting in a direction opposing the spring force.