4 way valve function July 8, 2019 16 32 64 128 4 2 way valve function 4 way protection valve function 4 3 way valve function Lmi 4 way function valve Pneumatic 4 2 way valve function 4 3 way directional control valve function 4 2 way double solenoid valve function 4 way valve 4 way valve operation 4 way water valve