File Library Check out the latest downloads available in the File Library. New Article Product Viscosity vs. Featured File Vertical Tank Selection. This topic has been archived. This means that you cannot reply to this topic. I am stucked up in the design pressure of the discharge line of air driven diaphragm pumps. We know that for centrifugal pumps, the lines and equipment downstream the pump should be designed for the shut off head of the centrifugal pump. So I set the design pressure of lines and downstream equipment like tubes of heat exchangers equal to the shut off head of the centrifugal pump.
However, is this the same for air driven diaphragm pumps? I have heard someone that the shut off head for these kind of pumps is the supply pressure of the air that drives it?
Is that correct? If so, why and how is that? Your insights will be helpful. Thanks in advance. Posted 26 August - AM shadow, For an air driven diaphragm pump, the process side is essentially a chamber with inlet and outlet check or non-return valves. The flexible diaphragm allows the chamber's volume to change from a very small residual volume to the maximum available.
The force that accomplishes these volume changes is the action of the fluid on the other side of the diaphragm - air. Thus, in the simplest configuration, you have your air supply on one side of the diaphragm and the process fluid on the other. At shutoff, the pressure of the two fluids would be equal. Note that I stated "in the simplest configuration". That is because alternate configurations are possible.
These can include configurations where a mechanical advantage is obtained for the driving fluid. This type of configuration would allow development of much higher shutoff pressures. If from reading the above it sounds as though an air operated diaphragm pump suits your industrial process application, take a look at our range of AODD pumps.
Alternatively, you can contact our technical sales engineers and they will advise you on a suitable model for your application. View our AODD pump range. Castle Pumps are fully accredited to enable you to buy with confidence. Our accreditation includes:. Our team of highly experienced technical sales engineers are here to support you and provide you with expert product selection advice.
Contact us. Call Us sales castlepumps. Can't see your application? Your deadlines met. How do air operated diaphragm pumps work? Design benefits Safe and clean operation — With no motors, packing or seals, the AODD pump is less prone to leaking fluid than typical centrifugal pumps.
Typical applications of an AODD pump Air operated diaphragm pumps are a versatile design suitable for the pumping of low and high viscosity fluids, including those that contain high solid content and shear sensitive mediums. The air operated diaphragm pump design makes it suitable for use in a wide range of industries: Fuels and oils Chemicals and acids Resins, glues, paints and inks Waste water Food and cosmetic product The way in which an air operated diaphragm pump works means that there is some pulsation in its flow output.
Below are the four common installation types for AODD pumps. AODD pump accessories Various accessories can be supplied to optimise the use and installation of the air diaphragm pump: Reinforcement rings to prevent breakages to the manifold connections. Air regulator kits to allow accurate control of the air flow to the pump and therefore its performance. Exhaust regulator and shut-off exhaust valves Anti-vibration feet for mounting to the bottom of the AODD pump to absorb any vibration caused whilst in operation to relieve the pipework from any stress.
Fluid and air connection isolation valves to isolate the pump for maintenance purposes. Check valves designed for fitting to end the suction pipe. These prevent the process fluid from flowing out of the suction pipe so that the AODD pump does not lose its prime. Flow meters for measuring the flow rate and total amount of fluid dispensed. Stroke counters for fitting to the air exhaust to monitor the number of strokes taken by the pump.
They can be fitted with a volt free contact output for integrating into a PLC system so that the operator can monitor the operation of the pump and control maintenance.
Pulsation dampeners can be mounted into the pumping assembly to minimise pulsations, vibrations and water hammer to provide a smooth, gentle flow.
They adjust to meet application conditions without having to be manually calibrated. Pneumatic batch controllers allow you to set the pump to automatically dispense a certain amount of fluid without the need for any electrical connections.
The unit will monitor the number of strokes taken by the pump by and therefore the volume displaced. When the AODD pump has reached the pre-set value the pump is stopped automatically. Pneumatic level control systems may be installed in sumps, pits or tanks to start and stop the pump at certain level without the need for electrical connections.
It is achieved by the controller monitoring the difference is air pressure between the 2 air hoses mounted into the container.
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