| 摘要 |
The present invention a tire valve cap pressure gauge comprises a hollow, cylindrical cap made of transparent material and having a series of pressure level markings, an inner piece and a valve stem. The inner piece having a cap top at its top end and a cap pin at its lower end is concentrically placed in the cylindrical cap, which is made of transparent material, and an inflatable diaphragm is internally attached to the inner piece and the cylindrical cap. The cap is then threadably attached to a valve stem found on typical tire, whereupon depressing the top portion of the inner piece causes the lower end of the inner piece to depress valve core inside the valve stem and thereby releasing the air inside the tire which in turn inflates the diaphragm. An indicator freely placed on the diaphragm rises with the inflating diaphragm and gives a tire pressure reading.
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