Plug valve having seal segments with booster springs

A plug valve comprising:

• a body which includes an inlet port, an outlet port and a cavity that is positioned between and communicates with the inlet and outlet ports;
• first and second seal segments which are mounted in the cavity and which each comprise a through bore that is coaxial with the inlet and outlet ports;
• a plug member which is rotatably positioned between the first and second seal segments and which includes a hole that extends transversely therethrough;
• wherein the plug member is rotatable between an open position in which the hole is aligned with the through bores and a closed position in which the hole is offset from the through bores;
• and
• first and second booster springs which are each positioned between the first seal segment and the body;
• wherein the first and second booster springs each comprise an elongated body that includes at least one transverse bend;
• and
• wherein the first and second booster springs are each oriented generally parallel to the rotational axis of the plug member.