Plug assembly for high-pressure valve

Plug assembly (44) for high-pressure valve (10) of the type with a tubular body extending along a longitudinal axis (A) and in which, under the action of a piloted actuator, a needle (14) moves longitudinally (A) between a closed position and an open position, the plug assembly (44) comprising a plug (26) having a flat part (27) able to be fixed onto the body transversally to the longitudinal axis (A), and a spring (36) intended to apply to the needle (14) a force biasing it axially towards the closed position. The spring (36) is fixed to the plug (26) forming with it an integrated assembly (44).