| 摘要 |
<p>A cartridge style, pop up, differential pressure indicator (10) includes a threaded body member (11), a cover structure (12) and a cylindrical indicator button (15), which carries a magnet (60) at its lower end, and is slidably supported in the cover (12) for movement between a depressed, hidden position and an extended indicating position. The button (15) is engaged at one side by a leaf spring (65) which in the depressed position urges a lip (62) on the button (15) under a ledge (58) in the cover (12) to serve as a detent. A piston (22) slidably supported in the body (11) is subject to differential fluid pressures and carries a magnet (26) at its upper end, poled in a manner to repel the magnet (60) in the indicator button (15) to urge the indicator button against the bias of the detent spring (65) and upwardly to the extended, indicating position. A semicircular bimetal strip (72) supported in the cover (12) engages the detent spring (65) at lower temperatures to prevent false release of the indicator button (15) due to cold weather, high fluid viscosity situations.</p> |
