The energy gained by a unit weight of liquid through a pump is called lift.
The lift of the pump, including the suction stroke, is about the pressure difference between the outlet and the inlet of the pump.
Refers to the force on the contact surface of two objects, or the vertical force of gas on the surface of solid and liquid, or the vertical force of liquid on the surface of solid.
The lift of the pump refers to the height at which the pump can lift water. It is an important working performance parameter of the pump, also known as the pressure head. It can be expressed as the increase of pressure energy head, kinetic energy head and potential energy head of fluid, that is
h=(p2-p 1)/ρg+(c2^2-c 1^2)/2g+z2-z 1
Where h- lift, m;
P 1, p2-the pressure of the liquid at the inlet and outlet of the pump, pa;
C 1, C2—— the velocity of the fluid at the inlet and outlet of the pump, m/s;
Z 1, Z2- entrance height, m;