Working Principle:

When the plunger going up,the tube'valve is opened,At the same time,the plunger's valve are closed and oil going up to the tube' lower space. Then the up stroke is end.

The tube's valve is closed when the plunger is setting down,the plunger's valve are opened and oil going up to the tube's upper space,then the down stroke is end.

Machinery Peculiarity:

This pump is include of pump tubing,plunger coupling extension,standingvalve and so on. The machinery is simpleness and manipulate easily