Modular blow-off valve for automotive damper

A modular blow-off base valve is provided for a vehicle twin tube damper in which a valve body is inserted into the end of an inner damper tube. The valve body has a central opening into which is inserted a valve cage assembly. The valve cage assembly includes a valve cage tubular member having a blow-off valve opening which is pressed into the central opening. A valve stem forming a valve seat with the blow-off valve opening is biased into a closed position by a helical spring seated against the underside of the valve stem at one end and a spring retainer fastened to the bottom of the valve cage at its other end. An annular bleed disc, intake disc and washer disc fit over the tubular member and cover rebound openings in the valve body. When the valve cage assembly is placed into the valve body's central opening, the washer disc biases the intake disc into sealing engagement with the rebound openings in the valve body.