General description Used on most American trucks and trailers, this 2X Truck Standard Air Leveling Height Control Valve is designed to replace various part numbers including VS-227, 53321-Q120, and others. It is suitable for all Hendrickson suspension applications, 1980s Neway trailer air suspensions, and most other trailer air suspensions. Technical specifications Type: Truck Leveling Valve Inlet Port: NPT1/4 Max Working Pressure: 1.2 Mpa Hole Center: 38 mm Thread: 1/4-20UNC Material: Aluminum L Length: 175 to 295 mm Maximum Movement Angle: 45 degrees Measurement Allowed Error: +/- 1-3 cm Compatibility and accessories Replaces: VS227, 171.H184, 53321-Q120, 90054007, KD2204, 50433001, 60826000, E11494, HTSVS227 Interchange Part Number: 53321-Q120, 90054007, KD2204 Installation Recommended installation should not exceed the maximum movement angle of 45 degrees. The L/A length ratio should be less than 1.2. Usage If a shorter yaw is used, the height valve will generate a large air