PUSH-DOWN HEAD FOR PUMP AND PUSH-DOWN HEAD TYPE DISCHARGE PUMP

摘要

The present invention provide a depression head type discharge pump with a nozzle being open and shut by forward and backward displacements of the valve rod member by means of a lever member and a first bias member, wherein a second bias means is interposed between base and tip portions of the valve rod member to prevent the air from flowing back. A depression head for a pump comprises a head body 24 having a liquid conduit 36 communicating with a stem 6 of a discharge pump and hanging from a lower face of a transverse cylinder portion 30 provided with a nozzle 34 opened at its leading edge portion, and is constructed so that a valve rod 52 provided in the cylinder portion 30 is displaced backwardly and forwardly when the head body 24 is depressed; the valve rod member 52 is formed by a base portion 58 and a tip portion 66; and a second bias means 70 is interposed between the base portion 58 and the tip portion 66.