| 摘要 |
A differential pressure indicator is disclosed, providing an indication upon detection of a predetermined level of differential pressure in a fluid pressure system. The device includes a piston mounted to a rolling lip diaphragm, with the differential pressure exerted across the piston, which is thereby moved against the resistance of a bias spring from a non-display position to a display position upon development of the predetermined differential pressure. The piston is viewable in the display position through a 360 DEG window formed integrally with the housing or by a separate transparent ring assembled into the housing. Valving may also be controlled by the piston movement, enabling communication of fluid pressure to an outlet port for activation of a fluid pressure operated audible signal or other indicator device.
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