Damper valve

A valve assembly comprising:

• a valve member movable to selectively open and close a conduit and being carried by an elongated valve stem;
• an actuating assembly adapted to selectively control the movement of said valve member and including, a plurality of elongated guide means extending parallel to said valve stem, a movable transverse member extending between said guide means and slidable therealong, an actuating rod means communicating with said movable transverse member for selective positioning of said movable transverse member along said guide means, and biasing means communicating between said valve stem and said movable transverse member for biasing said valve member toward the closed position thereof and for providing a lost motion connection between said first transverse member and said valve stem after said valve member initially makes contact with such conduit.