Standard modern windmill well pump (left) connects to the bottom of a string of pipe. See illustration at the top of this page.
The Pump Rod transmits the recriprocation motion from the gearbox to the pump piston through the full length of well pipe. The pumping cycle is slow and steady, reducing friction and allowing operation at higher efficiency than is possible with rotary pumps. Rotary pumps require much higher speeds and hence suffer from increased losses due to friction that are not experienced by a windmill pump. It is always best to locate the pump cylinder below the lowest level of water for the most dependable operation.
Iron Man Windmill Pumps use a stainless steel liner with a highly polished inside diameter. This SS liner is pressed into a hot galvanized steel casing that has been properly prepared. Old fashon windmill pumps used piston seals, often called leathers or pump buckets. While leather seals have provided good service through the years, they suffer from considerable friction when working on the cylinder wall and hence limit operation efficency to about 50% (see note 1). Iron Man Pumps do not use any leather seals or any leather parts. All seals are made in our factory from either a special formulation of Poly-urethane or Poly-Ethylene, depending on the type of service. Modern pump seals work with reduced operating friction. In turn, this reduces the load on the gearbox and bearings allowing the windmill to begin working in lighter winds and allowing the windmill to operate at a higher rate of speed pumping more water than is possable when leather seals are used. Seal life has also been extended an average of about 100%. Pumps for shallow well service - up to 60ft - are usually provided with 2 piston seals. Pumps used with higher pumping elevations are provided with 3 or four piston seals.
Accurately machined hemispherical poppet valves are used exclusively in all pumps from 2in inside diameter to 10in inside diameter. They provide the most efective seal, opening and closing quickly. Smaller pumps are provided with ball valves, larger pumps use two or more flapper valves that are mounted on and faced with silicon sheet as a hinge and a seal. Silicon valve facing costs more but seals better and greatly outlasts neoprene or leather. Valve ports of the largest diameter possable are used to maximize the free flow of water through the ports and around the valves.
Iron Man well pumps are available in two configurations - open top and closed top. Open top pumps allow the pump rod to be disconnected and easily removed, without having to remove the well pipe. This makes replacing the piston valves a snap. An optional removable foot valve allows the piston to be lowered and rotated, causing the bottom of the piston to connect with the foot valve cage. Both can then be lifted to the surface for servicing without any need to remove the well pipe. This is a great convenience when servicing deep well pumps. Iron Man Windmill Co. regularly provides standard or special pumps of all sizes and types for every pumping application.