The QF-B20 3-position 4-way pneumatically-controll

The QF-B20 type 3-position 4-way pneumatically-controlled distribution valve,which is the control valve for the jaching operation of the self-discharging truck,Can be used in combriation with the modular control gas vclve Qsw26-6L(electro magnetic gas valve)to realize the "jacking,pausing,lowering"operation.This bidirectional valve,which can be installed directly on the gear pump,will choose automatically the "pause"position in case of accidental loss of prueumatic pressure to prevent sudden lowering of the truck and ensure security.The valve also features pneumatic-controlled slow lowering function.