Diaphragm pump (also called diaphragm pumps) is a positive displacement pump that pumps liquid through the interaction between a rubber, thermoplastic, or Teflon diaphragm and a suitable valve (check valves on both sides of the diaphragm, butterfly valves).
Types of Diaphragm Pumps
A diaphragm pump has the following three types :
- In this type, a valve in which one side of the diaphragm closes with pump fluid and the other side with air or hydraulic fluid. The diaphragm is curved, which increases or decreases the size of the pump chamber. Check valves are used in pairs to prevent the backflow of liquid.
- The second type drives by an electromechanical motor, a crank, or a gear motor. The driver mainly controls the movement of the diaphragm or uses positive displacement if the lever or handle is completely mechanical. In this process, the membrane is bent by a simple mechanical action, which opens one side of the membrane to the air.
- •The third type uses one or more unsealed membranes that provide fluid to both sides of the membrane. The diaphragm bends again so you can change the volume.
Diaphragm pumps widely use in many industries and can handle a wide variety of fluids. Diaphragm pumps can move liquids with low, medium, or high viscosity and large solid liquids. It can also handle many harsh chemicals, including various body substances and acids from membranes.
Resilient diaphragm pumps can use as common dynamic seals, removing many of the limitations of other sealing methods. They have leak-free, friction-free, and pressure-sensitive properties. With proper material considerations, the membrane can seal over a wide range of pressures and temperatures without the need for lubrication or maintenance.
Diaphragm pump function:
- Low-pressure pump with good suction stroke function and low flow rate. Depending on the effective working diameter and the length of the diaphragm stroke, the flow rate of other flow meters increases. It can handle large amounts of gravel, solid mud, and mud.
- The pump design separates the pump fluid from possible internal pump components.
- Internal components of the pump are often shut down and disassembled with oil to extend the life of the pump.
- Suitable for abrasive and corrosive solutions
- Suitable for exhaust pressures up to 2001,200 bar
- Good dry running performance.
- Can use to create an artificial heart.
- They use to manufacture air pumps for small aquarium filters.
- Very effective.
- Excellent self-priming ability.
- Can handle very viscous liquids. The viscosity correction table can use as a tool to prevent a low number of AOD pumps.
- Can give off corrosive, abrasive, poisonous, and flammable liquids
Advantages and Disadvantages of Diaphragm Pump
Advantages:
- It is oil-free
- This pump may run for short time in dry condition
- It has self-priming property
- A diaphragm pump has an easy maintenance and cleaning
- Good wear friction
- It has large displacement volume
- It has versatile operation and design
- Accessible in food grad design
Disadvantages:
- This pump has low maximum speed than a pneumatic pump
- It needed a damper for the reduction of pump flow.
- It doesn’t have very high efficiency than a solar pump
