| 摘要 |
<p>A differential pressure indicator is of the type which uses a magentically attracted spring loaded pop-up button (44) to indicate when the pressure difference between two fluids reaches a predetermined difference. In order to reduce or eliminate false readings caused by fretting between the button (44) and a housing passage (43) in which it slides, the button (44) and the passage (43) have a square cross-section to prevent rotation. <IMAGE></p> |
