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Maxton Manufacturing Company overspeed / pipe rupture valves serve the commercial and residential hydraulic elevator markets. These valves provide protection against supply line failure that causes overspeed in the down direction. Know that Maxton pipe rupture valves have your customer and elevator riders safety in mind. OSVB25 replaces the cast OSV25 model with New part number and billet design allowing full inhouse manufacturing and assembly. Previous model OSV25 inventory will be exhausted March 1, 2023.