Patent ID: 7931126

Claim:
A lubricator for equipment that is exposed to pressure comprising an external body with a central duct through which is introduced a lubricating grease and coaxial therewith a compartment with a shaped seat, and a coaxially aligned sliding shutter including a front shaped plug and an intermediate stem with a rear seat associated with a first stop pin, said coaxial compartment having a rear threaded end and screwed therein a rear security dowel, said rear security dowel having a front seat associated with a second stop pin that is assembled in opposed position and coaxially aligned with said first stop pin and forming a coaxial guide for a counter spring engaged between said aligned stop pins and holding said first and second stop pins axially spaced from one another when fully extended, said intermediate stem of said shutter and said rear security dowel being provided with peripheral grooves with a helical progression whose direction is opposed to that of the screwing direction of threading of said security dowel and of the corresponding rear threaded end of said coaxial compartment, with the thrust of said axially flowing lubricant through said coaxial compartment unloading in a radial direction near said security dowel.