YAMAHA KHY-M7154-00 YS12 YS24 YG12 Vacuum Generator Valve BIT The YAMAHA KHY-M7154-00 Vacuum Valve BIT is a precision internal component used in the vacuum ejector and pneumatic control system of compatible YS12, YS24 and YG12 SMT placement equipment. The BIT works as part of the vacuum valve structure rather than as a complete standalone ejector assembly. Its condition directly influences the response and sealing performance of the pneumatic vacuum circuit. During SMT