Ford Thermactor Air Bypass Valve Cutaway Diagram - Port Identification

This document is a labeled cross-section (cutaway) line drawing of an air bypass valve, part of the Thermactor secondary air injection (emissions) system. The illustration shows the internal construction of the valve, including its diaphragm assembly at the top and the internal valve/seat mechanism in the body. Four external connections are called out with arrows: a VACUUM NIPPLE at the top (the vacuum signal port that actuates the diaphragm), an INLET on the left side (air supply from the air pump), an OUTLET on the right side (air passed downstream to the exhaust/thermactor plumbing), and a CONNECTION FOR REMOTE DUMP at the bottom (the port through which bypassed air is vented/dumped). The drawing contains no text beyond these four callout labels — no part numbers, torque specs, year/model applicability, or test procedures are shown. A reader can learn the physical port identification and orientation of the air bypass valve, which is useful when connecting hoses correctly or diagnosing the secondary air system. The scan was uploaded as part of an album of 1990 Ford Bronco emissions diagrams, though the drawing itself does not state a vehicle application.