Documents / How The Cylinder Works

How a Cylinder works

  • This is known as a positive displacement pump or p.d. pump.
  • A p.d. pump cannot operate against a closed valve.
  • A windmill cylinder consists of a stainless steel tube, a rod fitted in the tube with a piston and a unique Jooste foot valve. The rod is connected to the windmill gearbox by means of several 3 meter rods. The cylinder is manufactured with a threaded socket and is connected to the rising main which carries the water to the surface.
  • The piston moves up and down with the reciprocating action of the windmill.
  • The piston and the foot valve are fitted with valves.
  • On the upward stroke the piston valve closes, the foot valve opens and the tube is filled with water. On the downward stroke the foot valve closes, the piston valve opens and the water in the tube is displaced.
  • This process is repeated and the water is moved to the surface.
Cylinder diagram

How a windmill works

Three windmills
  • A windmill converts wind energy to rotary energy. The gearbox of the windmill converts this rotary energy into up and down reciprocating strokes carried down through the rods to a windmill cylinder located below the water level at the bottom of the rising main.
  • This reciprocating action then brings the water to the surface.