20090311582 | VENTING PLUG FOR STATIONARY BATTERIES, WITH BLAST-RESISTANT PROTECTION AND UNLIMITED, AUTOMATIC TOPPING-UP SYSTEM, AND TOPPING-UP ASSEMBLY EMPLOYING SAID PLUG - A venting plug for stationary batteries includes a support body, screwable into an upper opening of a battery element, provided with at least one topping-up hole intended to cause an electrolyte topping-up liquid introduced into the upper part of the support body to precipitate into the battery element, a porous element, mounted in the upper part of the support body, intended to act as a filtering barrier for gases rising up from the battery element towards the outside along the topping-up hole. The support body has inside a topping-up bowl, in communication with two inlet and outlet connections, provided with an upwardly-protruding conduit which opens below the bowl into an outlet nozzle, and below the bowl there is provided a hermetic closing element of the nozzle controlled by a float assembly which leads the closing element to obstruct the nozzle when the electrolyte level lies above a preset operational level | 12-17-2009 |