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Diaphragm Pumps

Diaphragm Pumps

Blue-White’s CHEM-FEED® Diaphragm Pumps reliably feed chemicals in high-pressure applications with minimal downtime.

Explore single and multi-diaphragm technologies for industrial and municipal applications.

Diaphragm Pumps

Explore Diaphragm Pumps

What is a Diaphragm Pump?

Diaphragm pumps are mechanisms that combine the reciprocating actions of valves, be they check valves, butterfly valves, flap valves, or any other type of shut-off valves, on any side of the body, in order to move a fluid compatible with the pump. They are also known as membrane pumps.

How do Diaphragm Pumps Work?

While there are three main types of diaphragm pumps, all of them function under the same principle in which there’s an increase in the volume of a chamber, therefore there’s a decrease in the pressure, so the fluid is sucked into the chamber. The fluid is then forced out of the chamber after the volume is decreased, increasing the pressure.

The cycle is completed after the diaphragm moves up again, which creates less pressure and draws fluid into the chamber. Not unlike how an internal combustion engine works, with its cylinder creating the differences in pressure. Pumps then create a hermetic seal in the middle of the drive mechanism and the compression chamber. This permits the pump to transfer, compress, and exit the chamber without any lubrication.

Advantages of a Diaphragm Metering Pump

Pumps with a diaphragm essentially have no leaks. Since there are no seals between the wetted portions and the environment outside, a failed diaphragm is the only thing that might cause a leak. A diaphragm pump can be run dry forever without harm since it lacks internal seals or moving parts that need maintenance and cooling.

Additionally, they are self-prime. Diaphragm pumps are the best choice for dosing systems and handling fluids that are sensitive to shear because of their gentle and repeatable pumping action.

  • Low cost of ownership

    Maintaining your diaphragm metering pumps can save you money in the long run.

  • Energy efficient

    On the forward (power) stroke of a diaphragm pump, more motor torque is used, but much less on the reverse stroke.

  • High pressure capabilities

    Overcoming line pressure is easier with properly sized diaphragm metering pumps

  • Exclusive longer lasting diaphragm

    The revolutionary DiaFlex® diaphragms from Blue-White last the entire life of the pump.

General FAQS

With the fluid accelerating during the compression/discharge phase and slowing during the suction phase, the cyclic operation of a diaphragm pump produces pulses in the discharge. Vibrations from pulsing can harm the discharge system. Simple diaphragm pumps frequently employ some kind of smoothing or damping.

  • A sophisticated compressed air distribution system that routes the air to the two air chambers on the opposing sides of the diaphragms is necessary for an air-operated double diaphragm pump. The pressure of the compressed air supply must match or exceed that of the fluid that is being pumped. Due to this, air-operated pumps are normally only used in low-pressure applications (typically 120psi).
  • Air distribution systems that are poorly planned might cause icing as well. In extreme circumstances, the repeated venting of air can lead to the accumulation of ice near the air vent or inside the distribution system. Avoiding constrictions, lowering the compressed air supply’s humidity, installing a heater, or lowering the air pressure are all ways to mitigate this issue.
  • The difference in pressure between the air supply and the fluid being pumped controls pump speed. The pumping speed increases as the pressure of the compressed air supply rises or the pressure of the fluid being pumped falls. Additional flow and pressure control may be required if a steady flow is required.
  • Because of the pulsating flow and venting of the air valves, air-operated diaphragm pumps can also be noisy. Installing a muffler on the air vent pipe will reduce air noise.

Utilizing two or more diaphragms that operate in succession is one method of decreasing pulsation issues. A double diaphragm pump, for instance, has one diaphragm in the compression/discharge phase and the other in the suction phase. The air-operated double diaphragm pump is the most prevalent example of this kind of pump (AODD). An AODD has air chambers on the opposing sides of two diaphragms that are alternately fed air and vented air.

The employment of a motor, which transforms the rotational motion of an electric motor into the lateral, reciprocating, back-and-forth motion necessary to drive the diaphragms, is an alternate method to air actuation. One method to accomplish this is to shift the two diaphragms using an eccentric cam on the motor’s driving shaft, much like an air distribution system.

The pressure restrictions associated with air feed actuation are eliminated when the pump is driven by a motor. Diaphragms may be more prone to wear with a direct motor connection, although compressed air operation has the advantage of pressure balancing. By adding a hydraulic device between the cam and the diaphragm, this issue can be eliminated.

Diaphragm pumps are used in a variety of industries, including the automobile industry, the ceramics, stone, marble, glass, and mining industries, the galvanic and electronics industry, the graphics industry, the textiles, and tanning industry, the production and storage of biodiesels, the chemical industry, packaging, glue, paper, and paper mills, the mechanical and metallurgical industry, water and sludge purification, the paint industry, oil and gas, and gold processing.

Unlike centrifugal systems, sanitary diaphragm pumps can handle materials with solids, like soups or chicken gizzards.

Centrifugal Pumps are suitable for low-viscosity fluids. The revolving propeller system provides variable pumping rates for juices, concentrates, beer, and wine. Adjustable pump speeds allow cost-effective flow control.

Also, centrifugal pumps are economical and rapid, but not necessarily the ideal solution for high-flow pumping. Sanitary diaphragm pumps are better for low-flow, shear-sensitive, or temperature-regulated goods.

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