& nbsp; < b > series brake valve & nbsp; & nbsp; 3514N2 - 010 11, 12 - inlet & nbsp; & nbsp; & nbsp; 4-M16X1.5-6H & nbsp; 21, 22, a port & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 2-M16X1.5-6H & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 3 - exhaust port < b > use: < / b > in the braking process of the dual circuit brake system and release process to achieve sensitive servo control. applicable models: EQ1118G, EQ1206, EQ1142G6D, EQ1242 and other air brake models.