Metering pumpA form of reciprocating pump that uses a positive displacement to release a precise amount of fluid in each stroke. The rotary motion of the pump is converted to reciprocating motion by using a wheel and worm shaft. These metering pump characteristics are general and can be applied to all metering pumps, but behave differently in each type. The principle of the metering pump is to control the amount of liquid that can be moved during the process. Their accuracy ensures that precisely measured amounts are added at the right time.

Bellows metering pump

Bellows metering pump is a positive displacement pump. The rotation of the motor shaft creates up and down motion on the lever crank system. This motion creates continuous compression and expansion on the bellows, forcing fluid in and out.

The operation of the bellows metering pump motor extends the bellows to create a vacuum to draw fluid through the inlet valve. As the motor continues to rotate, the bellows retract and drain the fluid that drains through the outlet valve.

Stoichiometric pump

Stoichiometric pumps are designed to add chemicals to the process using the repeatable, measured, consistent and controlled functions of the dosing pump. The key to the process is consistency, which is required for the type of material. Although there are a wide variety of pumps capable of performing the transmission process, stoichiometric pumps are very important because of their accuracy.

Too much or too little of the chemical can lead to catastrophic changes that make the substance too acidic or too basic. Improper and incorrect measurements can disrupt liquid applications where chemical fluids are being transferred. Piston and diaphragm metering pumps are the two most commonly used metering pumps in chemical applications.

There are five basic applications that require the use of stoichiometric pumps, and they are:

pH: The purpose of metering pumps for water treatment is to control pH, which is a measure of how acidic water is. Stoichiometric pumps measure sulfuric acid or caustic soda, which helps balance the pH.

Condensation or flocculation: Water contains impurities that must be removed. Coagulation or flocculation is a process that measures chemicals in water so that impurities and particles stick together and settle on the bottom of the stream or container for easy removal.

Enhancement: The final aspect of water treatment is adding materials to the water to stop the process, increase purity, or kill bacteria.

Fuel additives: Numerous fuel additives are injected into oil and natural gas using stoichiometric pumps.

Mining: Stoichiometric pumps are used to remove precious metals from ores using various types of chemicals. Each mining operation has its own proprietary raw material extraction method.

Diaphragm metering pump

With diaphragm metering pumps, the diaphragm is compressed and depressed to bring the liquid into the pump chamber and expel it. Much like a piston pump, the motion of the diaphragm creates suction or vacuum, which draws fluid into the inlet valve. Once the chamber is filled, the diaphragm sends the fluid out through the outlet valve.

The plunger is directly connected to the diaphragm and moves it mechanically. In a hydraulically driven diaphragm metering pump, the mechanism is not connected to a diaphragm driven by a hydraulic fluid. In both processes, the movement of the diaphragm is key to fluid distribution.

Electronic Metering Pump (EMP)

Electronic metering pumps operate on direct current (DC) or alternating current (AC). The main advantage of electronic metering pumps is their ability to better control the accuracy of the amount of fluid being dispensed. The pumping action is controlled by the current, allowing for more accurate and precise monitoring of the pump stroke.

Traditionally, metering pumps are driven in the same way as other forms of pump, such as pneumatic pumps, hydraulic pumps, hand pumps or fuel pumps.

Electronic metering pumps have replaced these other power supply methods and can be easily integrated into today's digital and computerized technologies. By combining the touch screen, the flow, volume and circulation of the metering pump can be controlled more precisely.

The new technology of the electronic metering pump allows automatic adjustment of the output to ensure that it is accurate to the set value regardless of the discharge pressure. In addition, the use of electronic metering pumps allows the operator to set the metering pump to the desired emission rate without having to calculate the capacity due to changes in stroke length Settings.

Gear pump

The movement of the gear metering pump is similar to that of a peristaltic metering pump without pipes. The meshing movement of gears creates a vacuum into which fluid flows or is drawn. As the gears rotate, they move fluid from the inlet valve to the outlet valve in a rapid rotational motion.

Gear metering pumps are commonly used for high viscosity fluids because they are built to withstand high pressures. Gear metering pumps are most commonly used in hydraulic fluid power applications.

Creep metering pump

The components of peristaltic metering pumps differ from the mechanisms of piston driven and diaphragm metering pumps. Peristaltic metering pumps have a hose or pipe through which medium passes. Control of the fluid is done by a roller located on the rotor. Negative pressure is created in the pipe that draws the fluid flow. Once the pipe is full, the rotor rotates and cuts off the flow. The rotating motion of the rotor forces the fluid in the pipe to flow in the direction of the pump.

When the drum completes its movement, the pipe is released and the hose is aligned with the water flow. Negative pressure is generated again, allowing the next supply of medium to fill the pipe.

Piston metering pump

A piston metering pump is a positive displacement pump that uses a piston to remove fluid from its chamber. The pump chamber determines the amount of fluid to be dispensed and the flow rate. The fluid flows through two check valves, the outlet and the inlet. When the piston retreats, a vacuum is created in the pump chamber, which opens the inlet check valve to allow fluid to enter the pump chamber. Once the pump chamber is full, the piston performs a discharge stroke and pushes the fluid out of the outlet check valve.

Plunger pump

A plunger metering pump works like a piston metering pump, but has a plunger as a reciprocating part instead of a piston. They are single-acting pumps that expel fluid during the forward stroke. Suction check valve suction fluid. As the plunger moves forward, fluid is forced out through the drain check valve.

The unique design of the plunger metering pump enables it to withstand high-pressure applications that piston metering pumps cannot handle. They can withstand pressures in excess of 50,000 psi and operate at higher speeds than piston metering pumps.

Small metering pump

A small metering pump is a miniaturized version of a large metering pump that uses the same operating principle. They feature miniature pump heads, drives and motors for conveying various forms of liquid media. The flexibility of the small metering pump allows the motor to be replaced as required by the application.

Most metering pumps have miniature or smaller versions, including gear pumps and peristaltic pumps. In addition to the obvious advantages of transportability, multiple small metering pumps can be used in groups to simultaneously monitor the flow of multiple fluids as part of a single process.

The mobility of small metering pumps makes them easy to install and configure. Their size makes it possible to quickly adjust flow, stroke length and cycle frequency. Small metering pumps can weigh as little as 39 grams or 1.6 ounces.

Electromagnetic metering pump

Electromagnetic metering pumps use electromagnetic energy as their driving force. When the electromagnet is energized, it attracts the plunger on the solenoid. This creates a reciprocating motion to move the diaphragm to suck in the right amount of fluid to be delivered.

The convenience and ease of operation of the electromagnetic metering pump is thanks to its LED display, which can be changed using simplified button controls. Stroke length, low maintenance, simplified operation, high efficiency and pump head structure make electromagnetic metering pumps particularly attractive. Electromagnetic metering pumps are used when more extensive emission control is required or complex external controls are required.

Syringe metering pump

Syringe dosing pumps come in two forms: infusion and extraction. In either case, they are designed to move a specific amount of fluid. With infusion syringes, small amounts of liquid can be injected at controlled pressure and time intervals. With an extractor syringe dosing pump, fluid samples are automatically removed for medical and pharmaceutical testing. Infusion syringe metering pump is mainly used for hospital dosing purposes, there are specific speed and flow regulations.

Syringe metering pumps use pistons to extract or inject liquid. They work slowly and are not used with automated applications. Syringe metering pumps are very sensitive to pressure changes under conditions where multiple syringe metering pumps are used. It can be concluded that the capacity of the container of the syringe metering pump to move small amounts of fluid is limited.

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