The Z3 Power Valve System is engineered for dependable zero leakage performance in high-pressure, severe-service applications, including power generation and critical on/off applications. Consisting of a modified Z1 valve and a pair of SW or BW end connections, the Z3 enables inline replaceability, eliminating the need to cut-out existing and weld-in replacement valves, while retaining all features of the Z1 Unibody Power Valve.