Metering Pumps & Metering Pump Manufacturers
Metering pumps are a specific type of positive displacement pump or chemical dosing device designed for the accurate and precision transfer of fluids. Also known as proportioning, controlled-volume and dispensing pumps, these liquid pumps are highly praised for their ability to move exact amounts of fluid in a given time frame with extreme accuracy and reproducibility.
Several different metering pump mechanisms are used to achieve the movement of exact amounts of fluid. Diaphragm metering pumps utilize a flexible membrane to initiate motion while piston metering pumps use a cylindrical plunger. Bellows pumps employ an accordion style pleated body to achieve displacement while peristaltic pumps use rubber tubing that is compressed by rollers. No matter the specific type, these chemical metering pumps can be used to transport any number of materials including acids, bases, corrosives, viscous fluids and slurries. Large and small metering pumps are therefore popular in a wide variety of industries related to chemical engineering and processing. Far from limited, however, metering equipment is commonly found in pharmaceutical, food and beverage processing, water treatment, medical, commercial vending, irrigation, petroleum, milling, sewage, plastic fabrication, metalworking and laboratory facilities as well. Each industry utilizes the unique ability of metering pumps to cyclically introduce a consistent amount of fluid into a continuous-flow stream ensuring homogeneity. Although micrometer screw adjustment is common, pneumatic and electronic metering pumps are also popular and increase the ability to employ computer and other automated programming in order to adjust flow rates throughout processing. With continuing technological advancements, fluid transfer pumps are utilized in any number of metering systems and lauded for accuracy and precision.
Some Leading Manufacturers
Burlington, ON | 289-812-7939
At Scherzinger Pump Technology, our metering pumps never disappoint! We have been designing, manufacturing, and supplying high quality pumps for more than 80 years. Our team of highly skilled engineers will work with you from design to delivery in order to provide you with the best product possible! Our pumps keep processes running around the world, providing quality performance and reliability. Visit our website and contact us to learn more!
Anoka, MN | 763-433-0303
We are your industrial pump experts! Our primary goal and philosophy is to build durable, high-quality pumps that work as hard as our customers. That is why we work closely with our customers, providing design and engineering assistance, innovative ideas, and reliable, high performance pump solutions. Our products serve many diverse applications such as metering, hydrostatic testing, pressure cleaning, and laboratory applications. So trust us to provide you with a truly exceptional pump!
Syosset, NY | 800-223-3388
As experienced metering pump designers and manufacturers, Fluid Metering has the innovative and effective metering pump solutions you need! We pioneered the first valveless rotating and reciprocating piston metering pump more than 55 years ago, and we continue to innovate and improve metering pump and dispenser technology. We set the standard for accuracy, precision, and durability, so get in touch with us today for the best metering pump solutions the industry has to offer!
Manitowoc, WI | 920-682-6173
Oil-Rite® Corporation is a world renowned manufacturer of high quality and innovative metering pumps and lubrication equipment. For over 80 years, our company has been serving industries like industrial and commercial machinery, aerospace, defense, food, beverage, mining, material handling, and many more! Oil-Rite® Corporation operates out of a 75,000 square foot facility in Manitowoc, Wisconsin. Call one of our representatives today or visit our website for more information!
While the means of motion may vary significantly, all metering pumps are composed of relatively few parts. The pump head is a cylindrical cavity which houses the fluids just before they are displaced. A fluid reservoir of variable size is connected via hoses or tubes to an intake check valve attached to the pump head. Opposite the intake point is the exhaust or outlet valve which is connected, again through the use of tubing or hoses, to the main body which holds the process flow to which the fluid is introduced. Each valve has the ability to flow only in one direction. The pump head also houses the diaphragm, bellows or piston that will enact motion, drawing the liquid in and expelling it. A motor or manual pedal is attached to this component depending on the specific design. Bellows and peristaltic pumps differ somewhat in design, but follow the same general operation. Metering pumping is a two part process. The first action is the suction, or intake stroke. At this point, the membrane or piston is withdrawn or the bellows extended. This action creates a vacuum effect which opens the inlet valve and pulls the fluid, be it oil, water, syrup or any other material into the pump head. The inlet valve closes as suction ceases. The motor or manual operator then extends the membrane piston, or compresses the bellows in towards the fluid which is then compressed as much as is possible and pressurized. This pressure forces open the outlet valve and the liquid is expelled due to displacement.
There are two methods for enacting variable fluid metering in pumps such as these. Either the length of the stroke may be changed to pull in differing but ever precise amounts of fluid, or the frequency of the cycle is altered. The two types are distinguished by name as variable displacement constant speed pumps and fixed displacement variable speed pumps. As the names suggest, the former adjusts the displacement, or the stroke in order to control the amount of liquid pumped per minute while the latter allows consumers to adjust the motor speed or cycle in order to enact change in the flow rate. Each model has the capacity to produce an unending continuous flow of metered fluid into an expulsion unit, be it a dialysis machine or beverage dispensing unit. The ability to adjust the stroke involves a more complex mechanism and a larger unit to allow for greater fluid transmission. For this reason, the fixed displacement variable speed type of metering pump is often preferred and commonly seen in industrial and commercial applications.
The wide use of metering pumps is largely reflective of the many benefits they offer. High accuracy dispensing, high system pressure, low flow rates in GPH or mL per hour, the capacity to handle hazardous or corrosive fluids and controlled dispensing that can even be metered by a microprocessor or computer are all common advantages of metering pumps. In order to ensure that manufacturers reap these benefits, however, several facts and features of a specific pump must be considered. To meet the supply of various industries metering pumps are extremely diverse. While most are adjustable, this is only true to a certain extent and care should still be taken when selecting the most appropriate model for a specific task. As the two types of pumps are determined by the way in which they affect flow rate, it is easy to understand why it is such an important consideration. This involves motor capacity as well as stroke length, or the degree to which the membrane, piston or bellows can be extended. Additional considerations include the maximum discharge pressure rating, temperature rating, flow rates, pump apparatus, motor capacity and fluid composition and viscosity. The type of liquid in use is extremely important as it has a profound impact on the functionality of the pump. Most liquids can be only slightly compressed, allowing for easy displacement. The introduction of gaseous bubbles, however, makes displacement more difficult as the air may be able to withstand a great deal of compression, perhaps even beyond the capabilities of the pump therefore leaving it ineffective at expelling the fluid. The material construct of the pump is also important with anti-corrosive and durable metals or plastics most often being used. It is essential to consider every aspect before investing in metering pump equipment.