Patent ID: 7540303

Claim:
An adjustable sealing device for use with a valve having a stem extending outwardly therefrom, said sealing device comprising: a. a cover having first caming surfaces on the inside thereof and being configured to be mounted to said valve; b. a seal assembly configured to be mounted around said stem for sealing engagement therewith; c. a cam having a lower portion and an upper portion, said lower portion adapted to be in pressing engagement on said seal assembly, and said upper portion comprising second caming surfaces adapted to be in caming engagement with said first caming surfaces for transforming a rotary movement of said cam about a rotation axis into an axial movement of said cam along said axis; and d. an actuator coupled to said cover and adapted to move linearly when rotated, said actuator being configured to induce said rotary movement of said cam; wherein when said actuator engages said cam, said actuator induces said rotary movement which is transformed into said axial movement by said first and second caming surfaces, said axial movement causing said cam to press said seal assembly against said stem.