| 摘要 |
A grease gun includes a relief valve and a grease barrel. The relief valve has a main member associated with the grease barrel. The main member further includes a compression passage with a relief outlet and a first opening, a first passage communicating the with compression passage at one end thereof and being joined to the barrel opening with the another end thereof, a second passage communicating with the relief outlet at one end thereof and having a second opening communicating with outside of the main member for receiving a ball, an elastic element and a screw rod and a third passage communicating with the second passage at one end thereof and joining the barrel opening at another end thereof. Once the screw rod is adjusted the length thereof in the second passage for regulating compression amount of the elastic element, the force of the ball for blocking the relief outlet is capable of being controlled.
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