Metering pumps can generally be divided into two types of plunger metering pumps and diaphragm metering pumps. Metering pumps are used in chemical, petroleum, pharmaceutical, mining, hydropower, atomic, paper, cement and food industries, and are important special pumps.
Metering pumps are pumps capable of precisely regulating and transporting media by means of flow (or stroke length) adjustment mechanisms (or equipment), Metering Pump as indicated by the flow (or relative stroke length) indicating mechanism (or equipment). According to the metering pump hydraulic end of the structural type, often metering pump is divided into plunger, hydraulic diaphragm, Metering Pump mechanical diaphragm and bellows metering pump four. Plunger type, hydraulic diaphragm type application is relatively wide.
The working chamber for the linear reciprocating displacement of the component is the plunger (piston) metering pump called the plunger metering pump; working cavity for the periodic deflection of the component is a thin film-like elastic components of the metering pump known as the hydraulic diaphragm metering pump (Generally not specifically specified, the diaphragm metering pump that is the hydraulic diaphragm metering pump); Metering Pump mechanical diaphragm metering pump diaphragm and plunger mechanism connected, no hydraulic system, Metering Pump plunger before and after the direct movement of the diaphragm before and after the deflection. The bellows metering pump structure is similar to the mechanical diaphragm metering pump, except that the bellows is used to replace the diaphragm. The plunger end is fixed to the bellows, and when the plunger reciprocates, the bellows is stretched and compressed to change the solution The volume of the cylinder. To achieve the purpose of infusion and measurement.
In addition to the characteristics of the general reciprocating pump, the characteristics of metering pumps also have the following characteristics:
(1) the pump during operation, Metering Pump the flow can be used according to the need to be close. % To 100% of the range of stepless adjustment;
(2) on the transport of liquid can be measured, and can meet a certain measurement accuracy requirements. The general accuracy of ± 1%, designed to create a good, the accuracy of up to ± 0.3%.
Metering pumps have been widely used in chemical, petroleum, paper, food, plastics, pharmaceutical and household chemicals because of their outstanding characteristics. Often used to transport strong corrosive liquids, suspensions, fuses, radioactive liquids, flammable and explosive liquids, toxic liquids, Metering Pump liquefied petroleum gas or liquid metals.
Metering pump flow, usually can be manually, electric or pneumatic automatic adjustment. In automatic control systems for continuous or semi-continuous process systems, Metering Pump pump flow can often be monitored by parameters such as temperature, pressure, density, pH, and so on.
Metering pumps are a special pump that can measure and deliver liquids, also known as dosing pumps or proportional pumps. The biggest feature of the metering pump is the ability to pre-select the amount or time interval to supply or extract a certain amount of material, Metering Pump often used in various types of pharmaceuticals to add complete sets of equipment, it is also known as dosing pump. In addition, the metering pump is also used in chemical, oil, water, mining, paper, food processing and other industries.
1. Classification of metering pumps
The metering pump is divided into a plunger metering pump and a diaphragm metering pump according to the overcurrent part. According to the driving method, it can be divided into a motor drive and an electromagnetic driven metering pump. According to the working mode, Metering Pump it can be divided into reciprocating and rotary type and gear type. According to the characteristics of the pump , Can be divided into electronic control type, gas control type, insulation type, heating type and so on.
2. The material of the metering pump
Metering pump commonly used materials are pvc plastic, stainless steel 304, stainless steel 316L, cast iron and fluorine plastic.
