Specifically for the measurement of liquid delivery pump. The vast majority of metering pumps use both piston and diaphragm pumps (see reciprocating pumps) and are also useful gear pumps because they maintain a constant flow independent of discharge pressure. There are two kinds of metering pump flow can be adjusted and can not be adjusted, the former is more applicable. The flow rate is mainly adjusted by changing the stroke length, such as changing the radius of the crank, the position of the back stop point on the plunger return stroke and the gap between the plunger rod and the crosshead. The flow rate can also be adjusted by changing the reciprocating frequency or both. Although the stroke length can be adjusted from zero to maximum, but in order to ensure measurement accuracy, are generally limited to 30 ~ 100% range. Metering pump metering accuracy refers to the accuracy of flow reproducibility, usually calculated according to the maximum flow rate. In the 10 ~ 100% adjustment range, the metering accuracy of the general metering pump is ± 1% (special metering pump accuracy is higher) The main factors affecting the measurement accuracy are the sealing performance of the plunger packing and the suction, the perfectness of the discharge valve work . Plunger metering pump has the advantages of high metering accuracy, wide adjustment range and high pressure. It only leaks at the packing seal, which will affect the metering accuracy of the pump after the packing is corroded and worn. This metering pump flow is generally 4 ~ 4000 liters / hour, the pressure is generally 5 × 10 (Pa or less diaphragm main advantage of the metering pump is no leakage, it is particularly suitable for not allow leakage occasions, such as the transport of flammable , Explosive, toxic and radioactive media, but also for the transport of liquids containing solid particles, so its development is very fast.This metering pump flow is generally below 2500 liters / hour, the pressure can be up to 35 MPa using the metering pump can Complete delivery, metering and adjustment of three functions to simplify the production process, to achieve automation and semi-automation, and improve product quality.Use multi-cylinder or multiple metering pumps, but also can be several media according to the exact proportion of the input reactor for mixing Metering pumps are increasingly used in the chemical, refining, pharmaceutical, food and nuclear industries, etc. Metering pumps are less efficient, typically 20%, and have a very low power.
Other Machinery Parts,Construction Equipment Parts,Earthmoving Parts,Hyundai Machine Parts
JINING SHANTE SONGZHENG CONSTRUCTION MACHINERY CO.LTD , https://www.stszcmparts.com