VALVULA LIMITADORA DE PRESION PARA PUNTALES DE MINA HIDRAULICOS

摘要

A pressure-relief hydraulic valve device for mining equipment is composed of a hollow sleeve mounting a guide with a through bore slidably receiving the stem of a valve member. The stem is provided with a blind axial bore leading to a set of radial bores and a seal in the bore of the guide co-operates with the radial bores to form a valve. A spring accommodated in the sleeve acts through a shaped pressure member to urge the valve member to a position with the valve closed. Pressure fluid in equipment to be protected acts on the valve member and excess pressure displaces the valve member against the spring force to open the valve and permit the escape of fluid via an outflow chamber and outlets in the sleeve. The pressure member has a piston like flange guided within the sleeve against which the spring bears and the underside of the flange of the pressure member is shaped to provide a concave guide face in the outflow chamber.