What is a diaphragm pump？

Diaphragm pumps, also known as control pumps, are the main type of actuators. They receive control signals from the control unit and use power to change the fluid flow rate. Diaphragm pumps are generally composed of actuators and valves. Using compressed air as the power source, they can completely pump out all kinds of corrosive liquids, liquids with particles, high viscosity, volatile, flammable, and highly toxic liquids.

• Types of diaphragm pumps

Diaphragm pumps can be divided into three types according to the power used by the actuators they are equipped with: pneumatic, electric, and hydraulic. That is, pneumatic diaphragm pumps with compressed air as the power source, electric diaphragm pumps with electricity as the power source, and electro-hydraulic diaphragm pumps with liquid medium (such as oil, etc.) pressure as the power source. In addition, according to their functions and characteristics, there are solenoid valves, electronic, intelligent, fieldbus diaphragm pumps, etc. There are many types of diaphragm pumps, and the structures are also varied, and they are constantly being updated and changed. Generally speaking, valves are universal and can be matched with pneumatic actuators, electric actuators, or other actuators.

• Diaphragm pump material

Pneumatic diaphragm pumps are made of four materials: plastic, aluminum alloy, cast iron, and stainless steel. Electric diaphragm pumps are made of four materials: plastic, aluminum alloy, cast iron, and stainless steel. Diaphragm pumps use nitrile rubber, chloroprene rubber, fluororubber, polyvinylidene fluoride, and polytetrafluoroethylene according to different liquid media. To meet the needs. They are placed in various special occasions to pump media that conventional pumps cannot pump.

• Features of diaphragm pumps

No leakage: No shaft seal design, the medium only contacts the diaphragm and the valve body, completely eliminating the risk of leakage (especially suitable for flammable, explosive and toxic media).
Strong self-priming ability: The dry suction height can reach 4-6 meters, and some models can run idling without filling the pump (significant advantages compared with centrifugal pumps).
Good passing performance: It can easily pass particles and mud with a diameter of less than 10 mm, and is suitable for media containing solid particles.
Strong corrosion resistance: The diaphragm pump is made of corrosion-resistant materials (such as Hastelloy + PTFE), which can handle various corrosive media and extend the service life of the equipment.
Accurate flow control: By adjusting the driving air pressure/motor speed, a linear adjustment of ±1% flow can be achieved (a key advantage in chemical batching scenarios).
Modular design: Quickly replace the diaphragm assembly, and the maintenance cost is only 30%-40% of the gear pump.

• Application scenarios

Chemical industry: In chemical production, it is often necessary to transport various corrosive chemicals such as strong acids and alkalis, and flammable and explosive media such as petroleum products. Diaphragm pumps are an ideal choice for the chemical industry because they can adapt to the transportation requirements of these special media. For example, in the electroplating process, it is used to transport electroplating liquid; in petrochemicals, it is used to transport crude oil, finished oil, chemical raw materials, etc. .

Food and beverage industry: Diaphragm pumps can be used to transport liquids such as milk, juice, and syrup. They have a high level of hygiene and will not cause pollution to food and beverages, meeting the strict requirements of the food and beverage industry for the hygiene and safety of transportation equipment.

Pharmaceutical industry: In the pharmaceutical process, it is necessary to transport liquids such as medicines and cosmetics. The high precision and good sealing of diaphragm pumps can ensure that the quality and purity of medicines are not affected, and are widely used in pharmaceutical production lines.

Construction industry: It can be used for the transportation and pumping of architectural coatings. In construction, the coating can be efficiently transported to the designated location to improve construction efficiency; when encountering water accumulation and other situations, it can also quickly pump water to ensure the safety of the construction environment.

Environmental water treatment industry: In the sewage treatment process, it is necessary to transport sewage containing impurities and particles. The diaphragm pump can show its prowess through the characteristics of liquid-containing particles; in water purification, it can also be used to transport various chemical agents to help purify water quality.