Wegman valves offers 2 types of expanding plug valves
If you require tight shut off, with zero leakage need to change the flow frequently and quick switching between separate streams on metering skids, meter provers, tank storage and transmission, custody transfer applications than the fur way diverter valve will do the job as no other design can.
Based on the same technology as the dual expanding plug valve where the sealing as done mechanically. All advantages apply here as well.
The seal on the slip is compressed until the secondary metal to metal seating is achieved, this way the primary seal is never over compressed.