| 摘要 |
<p>The invention relates to a relief valve core adapted to be screwed into a valve housing in a pressure vessel much the same way a valve core is screwed into a tire valve housing. The core of the invention comprises a threaded body adapted to engage threads in the housing. The body has an axial bore through which a pin extends, and a spiral compression spring extends downward from the body and circumposes the pin. The pin carries at its lower end a downward cup carrying a downwardly-facing sealing washer also circumposing the pin. The washer is adapted to seat on a seat provided in the housing coaxial with the threads in the housing. The invention involves improvement wherein an antifriction washer is disposed between the lower end of the spring and the upper wall of the cup.</p> |
