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Go with the flow with the Type 8750 flow rate controller

For bulk handling pneumatic conveying applications, the Bürkert Type 8750 flow rate controller presents a major cost-saving solution that replaces the control cabinet, control valves and the differential pressure transmitter in one device. Here, Tony Brennan, Field Segment Manager for .gas and .micro, explains how the Type 8750 can drastically improve your pneumatic conveying efficiency.

Bürkert Type 8750 flow rate controller

The Type 8750 flow rate controller is basically a control valve with two pressure transmitters either side of it and a control valve that acts as a fixed orifice plate. The difference with this system is that the fixed orifice plate isn’t actually fixed – it can move depending on the signals generated by the pressure transmitters. The pressure transmitters send a signal to the control head of the control valve, using differential pressure to calculate the flow of the air through the valve. The customer’s PLC might specify a certain setpoint and it would send a signal to the control valve. Then the control valve would control the system based on that setpoint.

Normally you’d have a control valve, a differential pressure transmitter and a control cabinet. Traditionally, there would be these three components in the system. With one part number the Type 8750 Bürkert flow rate controller replaces the control cabinet, control valves and the differential pressure transmitter. From a customer’s point of view, this presents far simpler logistics. It also presents a major cost-saving because the control cabinet is expensive and you don’t necessarily need it for simple conveying systems.

Mass flow rate controller for pneumatic conveying

If you’re using a rotary valve to feed in solids from a silo, as the rotary valve rotates the valve’s rotors fill up with powder and turn around. What tends to happen is that air from the system is lost to the seals and the rotary shaft as they’re rotating around. You can programme the leak rate of air from the system, so that (depending on the manufacturer of the rotary valve) the Type 8750 is able to calculate what that loss would be and then adjust its valve position to compensate. That’s probably the biggest advantage of the system. It does that automatically, without any intervention from the operator.

That ensures that the pipework doesn’t get blocked. If the air that flows through the pipe falls below a certain point, all the solids that it’s conveying basically stop moving. This can form a plug in the pipe, which is difficult to move and can result in having to cut the pipework to remove the plug. Or else it would require a very large air compressor to blow the solid out.

Depending on the various materials you’re trying to transport through the pipe, if the material you’re transporting can be damaged easily then you want to convey the product slowly through the pipe. You don’t want to shift it around as fast as you can because you will end up with powder at the other end. For those sorts of applications, you need to have more control over the system than you would do if you were just blasting pieces of plastic from one point to another.

The beauty of pneumatic conveying is that you have a sealed pipe, so it’s more hygienic than other types of conveying where you have an open pipe. If you’re conveying a material that can degrade in air, then you can basically fill that pipe with nitrogen and convey it using nitrogen gas instead of air.

The Type 8750 flow rate controller ensures that your conveying process runs smoothly each and every time.For more information about the Bürkert Type 8750 mass flow rate controller, or to discuss your application requirements in more detail, please contact our sales team today on +44 (0) 1285 648 720 or email sales.uk@burkert.com.

 

Type 8750

Flow rate controller for gases

Type 8750
  • Reliable and automated flow control on site
  • Stable control of the set point, independent on pressure fluctuations
  • Programmable alarm functions (pressure monitoring)
  • Simple start-up by manual setpoint setting and display
  • Leckage air compensation programmable for dense phase conveying systems

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