ALL-PLASTIC SINGLE-MATERIAL PRESS PUMP

An all-plastic single-material press pump, comprising a press head (1), a pump housing (2), a closure (3), a locking cap (21), a pump rod (4), a spring (5), a one-way valve (7), a piston (6), and a dip tube (8) which are made of a same plastic material. The closure (3) is connected to the upper end of the pump housing (2) in an inserted mode; the pump housing (2) is provided with an upper pump chamber (22) and a lower pump chamber (23); the locking cap (21) is provided between the upper pump chamber (22) and the lower pump chamber (23); the upper end of the pump rod (4) is fixedly inserted into the press head (1); the pump rod (4) passes through the locking cap (21) and extends into the lower pump chamber (23); the spring (5) is provided in the upper pump chamber (22); the pump rod (4) is provided with a suction channel (41); the lower end of the pump rod (4) is provided with a liquid inlet (42) causing the suction channel (41) to be communicated with the lower pump chamber (23); and the piston (6) is located in the lower pump chamber (23) and is sleeved on the outer side of the pump rod (4) to move up and down along with the pump rod (4).