Hydraulic Accumulator Shutoff Valve

Abstract

The US EPA is engaged in ongoing research to develop hybrid diesel-hydraulic power systems for delivery trucks. These systems store energy in high pressure hydraulic fluid accumulators, and require a high-pressure shutoff valve (HPSOV) to seal them when not in use. The goal of this project was to design a HPSOV that: a) when “open” allows flow in and out with minimal pressure drop, b) when normally “closed” allows fluid to enter the accumulator but not to exit the accumulator, and c) would equalize the pressure on both sides of the valve when opening. Other safety and reliability concerns were also addressed.