Dosing pumps have low volume, adjustable discharge rates that are used to inject various chemicals and viscosities of solutions.
Dosing pumps are sometimes known as metering pumps because they provide fluids at precise volumetric rates.
Dosing pumps are commonly built from plastic, thermoplastic, or stainless steel and equipped with mounting holes or accessories such as suction, discharge tubes, and fittings.
Dosing pumps are often linked with an electronic controller that enables the fluid flow to be monitored and altered simply.
Types of Dosing Pumps
Dosing pumps can work on the dynamic pump or positive displacement pump principle, depending on the design requirements.
Dynamic pumps, which can generate high flow rates with low viscosity fluids, create variable flow rates.
Positive displacement pumps, on the other hand, create a continuous flow that is ideal for creating high pressures (and low flow rates) with high viscous fluids.
The majority of dosing pumps are positive displacement pumps, which offer consistent, low flow for a variety of viscous medium.
There are two kinds of positive displacement pumps.
- Reciprocating Pumps
- Rotary Pumps
Pump with Reciprocating Action
A reciprocating pump operates on the repetitive forward and backward motion of a diaphragm, piston, or plunger within a chamber.
It causes the fluid to flow from the suction end to the discharge end.
Pump with Diaphragm
It makes use of a flexible diaphragm membrane. The capacity of the chamber is increased by extending the diaphragm. The greater amount of fluid drags it into the pump.
The fluid is pushed out of the pump by squeezing the diaphragm.
Non-return valves are fitted at the pump’s suction and discharge.
- Because diaphragm pumps are hermetically sealed, they are appropriate for hazardous fluid pumping.
- They are suitable for dosing non-homogeneous liquids.
- During operation, no leakage is discovered.
- The worn out pieces are simply replaceable.
- Self-priming.
Plunger or Piston Pump
Moving the plunger or piston generates a vacuum in the chamber, drawing fluid into it.
The fluid is compressed and pushed out as the piston moves forward.
- They are used to provide a lot of pressure.
- They necessitate the use of a check valve and generate pulsing flows that can be muted.
- The released volume is practically pressure independent.
- They’re preparing themselves.
The Rotary Pump
This type of pump allows for a constant flow of solution and chemical dosing. Peristaltic, Vane, Lobe, Gear, and Screw pumps are among them.
PLC systems or standalone controllers are utilised in dosing control to give proportional and integral action.
Pump with a Vane
The Vane pump is made out of a cylindrical chamber in which the vane rotates and a short head for dosing high viscosity fluids.
Lobe Pumping
Dosing liquids with a greater viscosity than water. Pumping action is created by revolving lobes, which might be two, three, or four in number.
Pump with a Screw
Gear, screw, and lobe pumps all provide the same job.
Pump with Gears
Two counter-clockwise rotating gears drive this type of dosing pump. The fluid that enters between the gear teeth is pushed forward, allowing for pulse-free dosing.
Gear positive displacement pumps are used in applications that need precise dosing or high pressure output. It facilitates the straightforward transport of viscous liquids at high pressure. Each turn, they pump a consistent volume of fluid.
Pump Peristaltic
Peristaltic pumps are made out of flexible, friction-resistant rubber or plastic tubes. Because the volumetric flow is proportional to the rotating speed and independent of discharge pressure, they are commonly employed for dosing pumps.
Peristaltic pumps work by rolling a roller over a tube and forcing liquid through it.
They are really precise.
They are capable of handling incredibly tiny fluxes.
They are self-priming and do not require check valves.
Appropriate for low-pressure applications.
Dosing Pump Installation
Materials: The basic materials of a dosing pump must be considered since they influence the type of media that may be carried out efficiently.
Different types of Dosing System fluids may be abrasive, acidic, caustic, extremely hot, very cold, or otherwise dangerous. Plastic, cast iron, and stainless steel have varied benefits for dealing with these various qualities.
Chemical Dosing System Components
The following are the basic components of a chemical dosing system.
- Tank or chemical container
- Pump
- Injector
- Foot control valve
- Line of administration
- System of control
Dos and Don’ts
Dosing pumps handle dangerous chemicals at high temperatures and pressures, the following precautions must be observed.
- When working near chemical dosing pumps, use PPE such as protective clothes, gloves, and safety eyewear.
- Ensure that all tubes are properly linked to the fitting while pumping chemicals.
- Tubing is properly protected or shielded to avoid potential danger in the event of a rupture or inadvertent damage.
- On plastic parts and connectors, avoid using hand tools such as pipe wrenches or pliers. The best used an open-end wrench to tighten it.
- If a hose is utilised, it must be firmly secured to walls, columns, bracing, and other structures. Check and check that the hose connection is tight and leak-free.
- An arrow on the pump indicates the direction of chemical flow, and suction and discharge connections are made appropriately.
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