SPIRAL SPRING VALVE FOR HYDRAULIC PROPS

The invention relates to a spiral spring valve for hydraulic props, meant to provide safety to constructions in the mining industry. According to the invention, the valve comprises a tension release bushing (1) wherein a safety relief valve (A) made up of a conical rod (2) is mounted on a support (3), on which there is a spiral spring (4), whose force is adjusted by changing the position of an adjusting nut (5), so as to obtain a prop bearing load in an adjusting range. The tension release bushing is coupled by screwing with a straining bushing (6), wherein an intake valve (7) together with return spring (8) resume their function by means of the conical rod (2). Inventia se refera la un ventil cu arc elicoidal, pentru stalpi hidraulici, destinat in special realizarii sigurantei constructiilor din industria miniera. Ventilul conform inventiei este constituit dintr-o bucsa de detensionare (1), in interiorul careia se afla o supapa de siguranta (A), formata dintr-o tija conica (2), montata pe un suport (3) pe care este dispus un arc elicoidal (4), a carui forta este reglata prin modificarea pozitiei unei piulite (5) de reglaj astfel incat sa se obtina o sarcina portanta, pentru un stalp, intr-un domeniu reglabil. Bucsa de detensionare este cuplata prin infiletare cu o bucsa de tensionare (6), in care o supapa de admisie (7) impreuna cu un arc de revenire (8) isi preiau functiile prin intermediul tijei conice (2).