A unitary valve trim assembly that can be easily installed in and removed from a valve body of a process control valve. The valve trim assembly includes a valve cage and a valve seat. The valve cage has a first projection that extends in a first direction that is perpendicular to a longitudinal axis of the valve cage. The valve seat has a second projection that extends in a second direction, opposite the first direction, that is perpendicular to the longitudinal axis. The second projection is arranged to engage the first projection to removably couple the valve seat to the valve cage.