XD4 Transfer and Circulating Pump
One of our customers was using our EP4 prelube pump to circulate mineral oil in a heat exchange circuit. They knew it was not designed to work under such harsh conditions but they loved the solid build and compact size. They were going through bearings at an unacceptable rate and asked us for a new design that could work without motor oil in the bearing. We call it the XD for Xtreme Duty.
The XD4 pump is designed to be durable in continues duty applications with harsh, poor lubricity fluids. It is a self-priming and quiet-running vane pump for use in a wide variety of transfer and circulating applications with non-corrosive fluids such as oils, fuels and coolants. Built with long term industrial applications in mind, it can produce over 60 psi pressure at nominal voltages of 12 thru 24vdc. It performs well with high viscosity fluids down to very cold temperatures. As a positive displacement pump it will self prime and is more efficient and quiet than a gear pump.
While its pumping performance is very similar to its sister the EP4, all running surfaces employ more durable materials to endow it with far greater life in non motor oil applications where good fluid lubricity is not a given.
Voltage and Flow
The XD4s permanent magnet DC motor can be run anywhere between 10 and 27 VDC. As the voltage increases the motor will turn faster causing more flow. At 12 VDC the pump puts out about 1.75 GPM. At 24VDC the pump makes about 4 GPM.
The voltage can also be varied within this range to set the pump flow to meet demands of an application. Verifying the voltage can be done actively with electronics using feedback from other system states or simply kept within operating parameters by using a current limiting power supply or with an appropriate resistor.
Variable Voltage Example Application 1:
A fuel "day tank" needs to be replenished to a given level within a certain range regardless of varying engine fuel demand. A sensor can be used to monitor the tank level. The pump voltage can then be electronically varied to regulate motor speed and pump flow to constantly maintain the desired fuel level.
Variable Voltage Example Application 2:
An oil based heat exchange circuit needs to be able to start up when the oil is cold and thick without overloading the pump. Since the system starts off cold, lower flow is acceptable as long as the pump motor is not overloaded. A current limiting power supply can be used that will keep the pump below 7 amps at startup by reducing the voltage and therefore the pump speed. As the oil heats up and thins out, the pump will gradually speed up until the power supplies nominal voltage is reached allowing full pump speed and flow.
Duty Cycle and Circuit Protection
The XD4 pumps permanent magnet motor is capable of doing an extraordinary amount of work for its size but it is also the limiting factor for duty cycle. When it is loaded beyond about 7 amps. at room temperature it will begin to make heat at a rate that is higher than it can dissipate heat. There are a number of factors that come into play in determining a safe duty cycle such as ambient temperature and airflow. In complex applications, the simplest way to determine the duty cycle may be thru direct experimentation. See the chart below for basic duty cycle guidelines. Adding active cooling to the motor can substantially improved duty cycle. Generally if the outside of the motor in maintained below 175°f (80°c) motor life will be preserved.
The motor current varies with the viscosity and the pressure required to pump the fluid through the system. Many oil-based fluids have a substantial viscosity response to cold temperatures causing high motor current draws. We recommend the Altech 16A TR-11 Series or Bussmann CB251-15 breaker be used on the power supply line to protect the motor from thermal overload under adverse conditions. These particular breakers have an amp/time curve that closely matches the motor/pump combination to properly protect the pump within its operating envelope for up to 3 minutes of cumulative motor on time.
For a PDF Data Sheet on this pump Click Here.
XD4 specifications
- Integrated, Direct coupled Permanent Magnet Motor
- Up to 4GPM (15L/m) flow rate
- Pressures in excess of 60 psi (4 bar)
- Whisper-Vane positive displacement vane technology
- Port SAE straight thread O-ring size: 3/4" (19mm)
- Designed for Transfer and circulation applications
Wetted Materials
- Carburized Carbon Steel
- Hard Anodized Aluminum
- Rubber Viton V884
To inquire about any of our pumps Click Here, or Call 888-676-7770.
VARNA products is a division of Transportation Research Corp. (TRC). We were created to bring the manufacturing of TRC designs under tight in-house control. Our focus has always been on consistency and product quality. Using six Sigma methodologies we continually refine our processes to optimize quality and perfect on-time delivery. By controlling every phase of manufacturing from how components are machined to assembly training, all the way to the packaging used in shipping, we are able to guarantee the quality of each item we sell. We deal only with a select group of pre-qualified vendors for the parts we do not make and all assembly and final inspection is done right here.
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