Cast Iron Diaphragm Pumps

Cast iron diaphragm pumps are the perfect solution for high-volume applications that require a lot of displacement. They offer reliable performance, even under heavy loads, thanks to their cast iron construction. Cast iron diaphragm pumps can also handle a wide range of fluids and temperatures effectively, making them an ideal choice for a variety of industrial and commercial applications.

Top Products

Best Overall

Why We Like

  • 12V pump that can handle up to 0GPM & 60 psi
  • Self priming up to eight feet
  • Approved For use with agricultural and lawn care applications
  • Fiberglass-reinforced polypropylene pump manifold with ½” FNPT Port
  • Standard mounting pattern

Minor Problems

  • It might be too large.
Editor's Choice

Why We Like

  • Premium Double Nitrile Diaphragms
  • Cast iron material
  • Durable and leak-proof construction

Minor Problems

  • It is a bit noisy.
Best Value

Why We Like

  • Double Nitrile Diaphragms
  • Sturdy & Leak-proof Construction
  • Max Temperature: 150 ℉/66 ℃
  • Max Pressure: 115 psi

Minor Problems

  • It might be noisy.
1/14
Everflo 4.0 GPM 12V Diaphragm Pump Boxed with 1/2

Everflo 4.0 GPM 12V Diaphragm Pump Boxed with 1/2" NPT Ports

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8.6
Based On 292 Reviews
  • Easy to use
    9.3
  • Value for money
    8.0
  • Customer support
    8
  • Overall satisfaction
    9.1

Pros

  • 12V pump that can handle up to 0GPM & 60 psi
  • Self priming up to eight feet
  • Approved For use with agricultural and lawn care applications
  • Fiberglass-reinforced polypropylene pump manifold with ½” FNPT Port
  • Standard mounting pattern

Cons

  • It might be too large.
2/14
Happybuy Air-Operated Double Diaphragm Pump, 1/2 in Inlet & Outlet, Cast Iron Body, 8.8 GPM & Max 120PSI, Nitrile Diaphragm Pneumatic Transfer Pump fo
7.3
Based On 181 Reviews
  • Easy to use
    8.4
  • Value for money
    5.6
  • Customer support
    7
  • Overall satisfaction
    8.2

Pros

  • Premium Double Nitrile Diaphragms
  • Cast iron material
  • Durable and leak-proof construction

Cons

  • It is a bit noisy.
3/14
Happybuy Air-Operated Double Diaphragm Pump, 1/2 in Inlet & Outlet, Cast Iron Body, 8.8 GPM & Max 120PSI, Nitrile Diaphragm Pneumatic Transfer Pump fo
7.3
Based On 181 Reviews
  • Easy to use
    8.4
  • Value for money
    5.6
  • Customer support
    7
  • Overall satisfaction
    8.2

Pros

  • Double Nitrile Diaphragms
  • Sturdy & Leak-proof Construction
  • Max Temperature: 150 ℉/66 ℃
  • Max Pressure: 115 psi

Cons

  • It might be noisy.
4/14
Cozyel 12 GPM Air-Operated Air Diaphragm Double Diaphragm Pump Cast Iron 115 PSI, Dual Diaphragm Air Pump Petroleum Fluids 1/2 inch Inlet/Outlet QBK-1
8.3
Based On 29 Reviews
  • Easy to use
    8.2
  • Value for money
    9.8
  • Customer support
    7
  • Overall satisfaction
    8

Pros

  • Air-Operated Double Diaphragm Pump
  • 12GPM 1/2Inch Inlet And Outlet
  • All-bolted construction
  • Serviceable air distribution system

Cons

  • The price is a bit high.
5/14
HOTSTORE 12GPM 115 PSI Air-Operated Air Diaphragm Double Diaphragm Pump Cast Iron, Dual Diaphragm Air Pump Petroleum Fluids 1/2 inch Inlet/Outlet
8.0
Based On 25 Reviews
  • Easy to use
    7.8
  • Value for money
    9.7
  • Customer support
    7
  • Overall satisfaction
    7.6

Pros

  • Diaphragm pump
  • Positive displacement
  • Uses a rubber, thermoplastic or teflon diaphragm
  • Check valve, butterfly valves, flap valves etc...

Cons

  • There might be a problem with the pump.
6/14
AmazonCommercial Heavy Duty Double Diaphragm Transfer Pump 1/2
7.3
Based On 28 Reviews
  • Easy to use
    6.9
  • Value for money
    9.5
  • Customer support
    6
  • Overall satisfaction
    6.8

Pros

  • Heavy-Duty Double Diaphragm Pump
  • Self-Priming pumps 13GPM (50LPM)
  • Suitable for fuel stations, construction sites, textile factories, mining stations and the environment

Cons

  • It may be heavy.
7/14
Happybuy Air-Operated Double Diaphragm Pump 1 inch Inlet/Outlet 30GPM Polypropylene Max 120PSI for Chemical and Industrial Use
8.1
Based On 15 Reviews
  • Easy to use
    8.0
  • Value for money
    9.5
  • Customer support
    7
  • Overall satisfaction
    7.8

Pros

  • Premium Double PTFE Diaphragms
  • Sturdy & Leak-proof Construction
  • Max Temperature: 150 ℉/66 ℃; Max Pressure: 120 psi
  • Max Flow Rate:79.6 GPM; Max Head Lift:275.6 ft/84 m

Cons

  • It might not be durable.
8/14
Taco 007-F5-7IFC Cast Iron Circulator Pump with Integral Flow Check (3-(Pack))
9.2
Based On 10 Reviews
  • Easy to use
    9.5
  • Value for money
    9.9
  • Customer support
    8
  • Overall satisfaction
    9.3

Pros

  • Unique replaceable cartridge design
  • Quiet and efficient operation
  • Capacitor or PC board: 007-002RP
  • Standard high capacity output compact design
  • 0.04 (1/25) horsepower motor

Cons

  • It might be cheaply made.
9/14
DC12V 18V Intelligent Diaphragm Pump 1.2mpa 3m Right Water Outlet Fresh Water Pump High Pressure Self-priming Automatic shower Booster Pump(18V Motor)
9.8
Based On 1 Reviews
  • Easy to use
    10
  • Value for money
    10
  • Customer support
    9
  • Overall satisfaction
    10

Pros

  • Automatic water pressure adjustment
  • Simplifies pipeline connection
  • Boost pump

Cons

  • It may not be powerful enough.
10/14
TABODD Double Diaphragm Pump 1/2 inch Inlet Outlet, Diaphragm Air-opearted Pump Cast Iron 12 GPM Membrane Pump QBY-15Z Double Diaphragm Diaphragm for
0.0
Processing Reviews
  • Easy to use
    0.0
  • Value for money
    0
  • Customer support
    0
  • Overall satisfaction
    0

Pros

  • Improved Formula
  • Easy to use wax
  • Long lasting wax protection
  • Amplifies reflection
  • Safe and effective on all glossy paints and clear coats

Cons

  • It might be too big or small.
11/14
DC48V Cast Iron and Steel Intelligent Diaphragm Pump Automatic Atomizing Simple Structure High Pressure Low Noise Pump 7.0L/MIN
0.0
Processing Reviews
  • Easy to use
    0.0
  • Value for money
    0
  • Customer support
    0
  • Overall satisfaction
    0

Pros

  • Cast iron and steel
  • Oil resistance, heat resistance, acid resistance, alkali resistance, corrosion resistance

Cons

  • It's heavy and bulky.
12/14
TOPINCN DC48V 120W Intelligent Diaphragm Pump Cast Iron Steel 7.0L/MIN Automatic Pressure Regulation Atomizing High Pressure Pump
0.0
Processing Reviews
  • Easy to use
    0.0
  • Value for money
    0
  • Customer support
    0
  • Overall satisfaction
    0

Pros

  • Intelligent automatic pressure regulation
  • Turn on the power switch and water outlet valve switch
  • Start to work, close the water outlet valve switch
  • The pump will automatically power off when overpressure is relieved

Cons

  • It may be too heavy.
13/14
10mm Cast Iron Steel 120W Intelligent Diaphragm Pump, High Pressure Diaphragm Pump, for Automatic Voltage Regulation
0.0
Processing Reviews
  • Easy to use
    0.0
  • Value for money
    0
  • Customer support
    0
  • Overall satisfaction
    0

Pros

  • Simple installation
  • Automatic pressure relief device
  • Oil resistant
  • Heat resistant
  • Acid resistant

Cons

  • It could be bulky.
14/14
MECCTP Commercial Heavy Duty Double Diaphragm Transfer Pump 1/2 inch Inlet & Outlet Cast Iron 12 GPM Max 120PSI, Nitrile Diaphragm, QBK-15-1/2
0.0
Processing Reviews
  • Easy to use
    0.0
  • Value for money
    0
  • Customer support
    0
  • Overall satisfaction
    0

Pros

  • Max Pressure: 115PSI
  • Max Temp: 122℉
  • Top quality glyd ring

Cons

  • It is a bit noisy.

Authors

Michael Gordon
Michael Gordon— Author

Michael Gordon is a writer on our Website. He is experienced in Hydraulics, Pneumatics & Plumbing section.

What to Look to have the Best Cast Iron Diaphragm Pumps?

Are diaphragm pumps reliable?

Diaphragm pumps are some of the most reliable moving parts when it comes to garage sales and consignment stores. They have few moving parts which makes them less likely to fail in high-traffic areas or when items get heavy.

Lastly, there is no shaft or bearing that requires sealing from the media, meaning these pumps are very reliable overall.

How long can you run a diaphragm pump?

A metering pump will last 6 to 12 months while a gear pump will last 3 to 6 months and the motor can typically last years. Be sure to replace your diaphragm pump after six or twelve months, depending on the type you have, and your motor may need an overhaul every few years.

Make sure that you have replacement parts available in case of failure so that you can keep your equipment running for as long as possible

What is the purpose of a diaphragm pump?

A diaphragm pump is an essential piece of equipment for those in the medical and lab fields. It's a type of pump that uses check-valves to prevent backflow, making it suitable for liquid meters, doses and transfers.

There is no tube design on a diaphragm pump - this means there is no fatigue or breakage due to wear or corrosion

How high can a diaphragm pump lift water?

A diaphragm pump is a useful tool for lifting water up to three metres (9.8 feet) high. The advantage of being able to draw liquids from the channels or basins below it makes this type of pump very versatile.

Loading tanks can be a huge benefit when used with a diaphragm pump, as you are not limited by the size of your container

How high can a diaphragm pump lift?

The pump's capacity will determine how high the diaphragm can lift. Stronger elastomer materials and foundation types with a greater weight can support higher lifts than those made from weaker materials or foundations of lighter weight.

Knowing the type of soil or ground below the foundation is important to choosing the right pump for your needs

Can a diaphragm pump run dry?

If your diaphragm pump runs out of fluid, it won't cause damage. A double diaphragm pump will start up again when it runs out of fluid. Adding more fluid to a running system won't damage the components

Do diaphragm pumps need lubrication?

Diaphragm pumps do not leak and offer little friction, making them a great choice for low-pressure sensitive applications. They can be constructed for low pressure sensitivity without the need for lubrication, sealing over a wide range of pressures and temperatures.

Without lubrication, diaphragm pumps offer an even seal at various pressures and temperatures

How much CFM does a diaphragm pump use?

A diaphragm pump can move a lot of air per minute, making it the perfect choice for applications that require high airflow rates. The SimpleSpirits 43 measures 49 GPM and will handle most applications with ease.

Always consult the manufacturer's specs before buying a diaphragm pump, as they vary depending on the application being used.

Can you Cavitate a diaphragm pump?

Cavitation is a phenomenon that can occur when the suction valve on a diaphragm pump isn't moving properly. Inadequate pressure can cause cavitation, and high inlet pressures prevent it from happening.

D analysis may be used to identify an issue with cavitation during operation of a pump, and correcting the issue could result in improved performance.

How much pressure can a diaphragm pump produce?

A diaphragm pump can produce a maximum air flow of 300 cubic feet per minute and a minimum air flow of 100 cubic feet per minute. The operating pressure for a diaphragm pump ranges from 10 to 120 psi.

Maximum water volume is 2,000 gallons and the minimum water volume is 50 gallons

How much vacuum can a diaphragm pump pull?

A diaphragm pump is a vacuum cleaner attachment that can be used on most standard vacuums. It has a suction side and a displacement side, which work together to create the vacuum.

The suctionSide pulls air and dust particles towards it, while the displacementSide pushes them away from the motorized part of the pump.

What is the difference between a diaphragm pump and a centrifugal pump?

A centrifugal pump is less complex than a diaphragm pump, and maintenance is minimal. Centrifugal pumps will last longer than diaphragm pumps - although both have their own lifespan.

Diaphragm pumps are more versatile and can be used for a variety of applications, whereas centrifugal pumps are designed specifically for pumping liquids or gases

How high can a 1hp pump lift water?

A 1hp pump can lift water from wells that are up to 200 feet deep. This pump has a vertical and horizontal reach, making it ideal for commercial units as well as residential homes.

The average delivery range is 19 gph, which means you can use this pump in any type of environment

Conclusion

Cast iron diaphragm pumps are a common type of pump used in water treatment applications. They have been around for many years and are still popular today because they offer good performance at a reasonable price. However, cast iron diaphragm pumps do have some disadvantages, including the fact that they can be difficult to maintain and may require replacement over time.