The piston pumps are volumetric operating machines whose purpose is to move a fluid inside a plant or hydraulic system. The displacement of the fluid takes place through the connecting rodcrank mechanism: this mechanical system transforms the rotary movement of the crankshaft into reciprocating movement of the pistons which, during their stroke, open and close the volumes inside the cylinder. The shaft-connecting rod-piston assembly represents the mechanical heart of the pump and finds accommodation, supported by two main bearings, inside the pump body. The latter, in addition to playing a structural support role, also serves as an oil container necessary for the lubrication of the mechanical parts. The hydraulic part of the pump is represented by the head and its components: valves and gaskets. The valves are two for each cylinder and are arranged one in opposition to the other on both the suction and delivery sides, opening and closing according to the movement of the piston ensure the correct passage of the fluid and guarantee directionality. In fact, the piston pumps are not affected by the rotation direction of the shaft. The gaskets, fitted with suitable bushings on the piston seats, prevent the fluid from leaking out of the pump.

• Piston pumps are mainly used when there is a need to use a fluid at high pressures. They deliver an instantaneous flow rate that is not constant and is affected by the single piston pumping. The greater the number of pistons, the greater the regularity of the flow. Most of the pumps have three pistons as this configuration has the best compromise between dimensions and pulsations.
• The pumps can be used at different speeds: being volumetric machines, the greater the speed the greater the flow rate will be. It is necessary to avoid too low or too high speeds both for reasons related to the volumetric efficiency and for problems related to the dynamic behavior of the seals and the mechanics.
• They can be powered either from a network or from a tank; in the latter case, however, it is not recommended to run the pump with a suction pressure below -0.25 bar.
• As their function is to provide a flow rate and not a pressure, they require the use of a nozzle / choke to pressurize the fluid and a safety or regulation valve to ensure that the system does not exceed the maximum pressure the pump is designed for.
• For special applications, such as hot water or use with aggressive fluids, pumps have been developed with appropriate technical devices such as PTFE or Viton seals, heads and parts in contact with the stainless steel fluid, etc.

• FORGED BRASS
• ALUMINUM
• NICKEL
• INOX

Brass head

Aluminum head

Nickel head

Inox head

• BRONZE
• ALUMINUM

Bronze piston rod

Aluminum piston rod

Can be coupled with various types of motors (electric, gasoline, hydraulic) directly or with flexible coupling.

Gasoline engine

Electric engine

Hydraulic engine