A check valve assembly includes a plug having a first end and a second end
spaced along a longitudinal axis of the check valve assembly. The check
valve assembly also includes a first valve seat, wherein the first end of
the plug sealingly contacts the first valve seat. A second valve seat is
spaced from the first valve seat in a direction of the longitudinal axis.
The check valve assembly further includes a resilient member between the
plug and the second valve seat and a spring member urging the resilient
member into sealing contact with the second valve seat and the plug.
