Dust trap valve with removeable double-life door and valve seat member

摘要

A dust valve for the discharge line of a dust collection system includes a removable closet with two wear surfaces and a coacting removable valve door with two wear surfaces mounted within the valve body. Once the coacting wear surfaces on the closet and the door are sufficiently worn that they need replacement, each element can be disconnected from its supporting structure, inverted, and then reconnected to the valve body so as to expose a new wear surface. The useful lives of these elements is thus doubled over conventional single wear surface closets and doors.