| 摘要 |
<p>It is described a pressure meter comprising a diaphragm (8) operatively fastened between a base body (2) and a protection cap (4) mutually engaged by close fit. The diaphragm (8) is elastically deformable by effect of pressure variations within a pressurization chamber (3) forced in the base body (2), against the action exerted by a counterspring (14) for activating a signalling device (5) when the pressure value exceeds a predetermined threshold. An adjusting ring nut (16) is screwed down on an end portion (17) of the protection cap (4) and acts on a plate (18) offering a rest surface to the spring (14). The ring nut (16) has a mesh toothing (21) operatively engaged by a power-driven pinion gear for adjusting the preloading force exerted by the spring (14) through screwing and unscrewing of the ring nut itself. <IMAGE></p> |
