Air Bypass Valve: Testing and Inspection
Air By-pass ValveINSPECTION
1. AIR BY-PASS VALVE
1. Check that the air by-pass valve has no deformation, cracks or other damages.
2. Connect the Mighty Vac to the nipple (A) of the air by-pass valve.
3. Using the Mighty Vac, generate the negative pressure to -93.3 kPa (-0.95 kgf/sq.cm, -13.5 psi). Check that the Mighty Vac gauge needle holds 10 seconds without falling by -92.6 kPa (-0.94 kgf/sq.cm, -13.4 psi).
4. Set a dial gauge to the end of valve rod of the air by-pass valve.
5. Using the Mighty Vac, generate the negative pressure, and check the pressure when dial gauge needle (valve stroke) shows 0.5 mm (0.02 in). If it is not within the standard, replace the air by-pass valve.
Opening pressure (valve stroke 0.5 mm (0.02 in)):
Standard -49.3 -- 57.3 kPa (-0.50 -- 0.58 kgf/sq.cm, -7.15 -- 8.31 psi)
2. OTHER INSPECTIONS
Check that the vacuum hose and air by-pass pipe have no cracks, damage or loose part.