What kind of working environment is the piston pump suitable for?
The piston pump is an important device in the hydraulic system. It relies on the reciprocating movement of the piston in the cylinder to change the volume of the sealed working chamber to realize oil absorption and oil pressure. The piston pump has the advantages of high rated pressure, compact structure, high efficiency and convenient flow adjustment, and is widely used in high pressure, large flow and flow adjustment occasions, such as hydraulic presses, engineering machinery and ships. The working environment refers to the environment in which the hydraulic pump operates, whether it is indoor or outdoor, whether it is above water or underground, whether it is fixed or mobile equipment, whether there is a requirement for field work in cold or severe cold regions in winter, and whether there are high temperatures, heat sources or open flames nearby.
If the hydraulic pump works indoors, since the temperature does not change much in the four seasons, the requirements for oil viscosity changing with temperature are not high. Generally, the viscosity index of hydraulic oil reaches 90 to meet the requirements, and HL can be selected. Or HM type hydraulic oil. If it is a walking equipment or works outdoors for a long time, it is required that the viscosity of the oil changes with temperature to be small, the viscosity index of the hydraulic oil should be greater than 130, and it is also required to have good starting performance at low temperature.
In cold areas, HV low-temperature hydraulic oil should be used, which can generally be used up to -20°C; in severe cold areas, HS low-temperature hydraulic oil should be used, which can be used at -40-30°C. If the hydraulic pump works in a hot and humid environment, on water or at sea, it may be exposed to a large amount of water mist or salt spray. It has anti-rust ability against sea water.
In industries such as metallurgy, electric power and coal, many hydraulic pumps work near high-temperature heat sources and open flames. Once the hydraulic oil leaks, it will cause a fire if it encounters a fire. This requires the use of non-flammable hydraulic oil. There are four commonly used flame retardant hydraulic oils: HFAS high water base fluid, HFB water-in-oil emulsion, HFC water-ethylene glycol flame retardant fluid and HFDR phosphate ester flame retardant hydraulic oil.