Automatic by-pass valving systems and methods

摘要: An automatic by-pass valving system for an electrical cable wherein insulating fluid at a pressure above atmospheric is supplied to power cable, such as pipe-type or self-contained having flow channel and least one hydraulic stop interrupting the of between channels adjacent portions which are different elevations. The comprises check valve, allows only in first direction, from lower elevation portion higher portion, flow-limiting second reduced rate. Preferably, relief valve also provided allow direction rate if difference exceeded by predetermined amount. limits loss when ruptured, protecting environment, while permitting limited point rupture protect contamination.