Metering pumpIs a precision mechanical device that moves or pumps a certain amount of fluid or liquid over a predetermined period of time to produce a precise volume flow rate. The term metering pump covers a wide range of pumping methods, each designed to meet the needs of an application, operation or process. The application determines which type of metering pump is selected.

The selection criteria for selecting a metering pump include the viscosity of the liquid, temperature, discharge pressure, flow rate and type of wet path material. The basic structure of a metering pump consists of a pump head and a motor with a manual or electric regulation system.

Most metering pumps are piston driven positive displacement pumps in which the piston moves the fluid in the reservoir chamber. While piston-driven pumps are common, there are several other types of pump configurations for unique conditions and fluids.

Dosing pumps or dosing pumps are capable of dispensing fluids, such as acids, bases, corrosive, viscous liquids or other fluid materials, to meet the requirements of a process or application. One benefit of dosing pumps is that they accurately complete repeated discharge of the material, regardless of the type of fluid or solution.

The components of the metering pump work together to provide superior continuous performance without maintenance. In essence, metering pumps are very simple devices that have been precisely designed to achieve optimal output.

Pump driver

The drive uses AC, DC, pneumatic or hydraulic power systems to power the pump.

Driving mechanism

The power provided by the drive is rotary motion, which must be converted into reciprocating motion for use by the pump mechanism. The drive mechanism performs this power conversion by converting the rotational motion of the drive into the desired reciprocating motion. Under high pressure industrial conditions, this part of the system is immersed in a lubricant or oil bath to ensure reliability and continuous performance.

Pump flow regulation

Flow adjustment includes adjusting the stroke and the number of strokes per minute. The stroke of the metering pump can be adjusted manually, axially or automatically.

Manual: The manual adjustment of the metering pump is done when the pump is turned off and is usually replaced with a screw mechanism.

Axial displacement: Axial displacement can be accomplished while the pump is running using N - or L-shaped crankshaft adjustment or eccentric CAM adjustment.

Automatic: Pneumatic and electronic control are two common ways to adjust the stroke of a metering pump. The pneumatic control changes the stroke by adjusting the pressure source signal, while the electronic control changes the electrical signal.

Check valve

The check valve is located at the suction and discharge ends of the metering pump. Check valves are available in a variety of designs, each of which allows liquid to flow into the chamber of the metering pump and allows liquid to flow out. With the exception of peristaltic pumps, most metering pumps have a spherical check valve with one or two balls.

Lift check valves are also common in metering pumps because they function the same as spherical check valves, allowing flow in only one direction. The operation of a lift check valve is very similar to the operation of a plug or stopper at a sink or bathtub drain. Lift valve The name of a check valve relates to a lift valve that opens and closes to control flow.

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