Frequently Asked Questions

We have listed a number of frequently asked questions about Micropump® products and common questions about doing business with Micropump. We hope you will find these useful and informative.

Frequently Asked Questions

Q: How can I identify a Micropump product?

All Micropump products have an "Identification Label" affixed to them. This label identifies the product by:

  • Part Number

  • Model Number

  • Serial Number

In addition, the month and year of manufacture are shown on the label.

Please refer to the example "Identification Label" below:

Pump Label

Q: What is decoupling?

Decoupling occurs when the driven or inner magnet inside the pump becomes desynchronized from the driving magnet or hub (installed on the motor shaft). When this happens, the driven magnet stops turning (as do the pump gears) and the motor/motor shaft/driving magnet continues turning at the motor's no-load speed.

Q: What is slip?

In short, slip is the difference between the actual flow put out by the pump and its theoretical flow if it were 100% efficient. As the pump gears turn, not all the fluid moved through the gears goes from inlet to outlet. Some of it "slips" between the gears and the cavity wall (or between the gears and the suction shoe). In general, slip gets worse as differential pressure increases, as viscosity decreases, and as gears wear.

Q: How does the suction shoe work?

A crescent shaped "shoe" is positioned directly over the top of the gears and acts as a floating cavity for the gears. This floating cavity concept allows the pump to maintain near zero slip throughout gear life due to its ability to adjust to gear wear. The shoe is held on the gears by discharge pressure and the suction port is located directly underneath the shoe.

Q: When should I specify Suction Shoe Pump versus a Cavity Style Pump?

Both the suction shoe pumps and the cavity style pumps are among the most well designed pumps in the industry. Each one has its own strengths and its more favored applications. For metering, the suction shoe pump would be preferred for its self adjustment capabilities. The cavity style pump will cover all other applications and also can be used for fluid metering.

Q: What is the dry lift capability?

This depends on the application. Click on tech tips dry-lift to learn more about dry lift, or consult your local Micropump distributor to inquire about your specific application.

Q: How do I prevent bypass damage when tightening the fitting on the inlet side?

When installing hose or pipe fittings, a pipe sealing compound or PTFE tape should be applied to the threads to prevent leakage. Two wraps of PTFE tape are sufficient to prevent excess material from clogging the pump. One quarter turn past finger tight is sufficient to seal the fittings. Secure the pump in a vice (using pads to protect the pump body), and support the motor when installing the fittings.

Q: How do I maximize the benefits of the internal bypass in the Micropump products?

The relief valve is a mechanism used to control or limit pressure by allowing the fluid to flow into an auxiliary passage, away from the main flow path. The valve is set to activate at a predetermined pressure. As the discharge pressure on the outlet side of the pump increases, so does the pressure within the magnet cup. When this pressure exceeds the force of the bypass spring poppet, fluid is diverted through the auxiliary passage to the pump inlet.

Users should be aware that over a prolonged period, the energy of fluid movement and friction will cause an increase in fluid temperature. This is a primary concern when the bypass is used to recirculate a large percentage of fluid in a low volume, closed-loop system. This feature often eliminates the need for costly external plumbing and helps to prevent overloading of your system.

Q: What are some common sterilization methods used on Micropump pumpheads?

Chemical disinfect and heat sterilization are methods used by our customers who require sterilized equipment. When choosing chemical disinfect procedures, the chemicals used must be compatible with the pump materials. Heat sterilization is the process of freeing an object from microorganisms using temperatures in excess of 212 °F.

  • The first method involves pumping superheated steam under pressure through the pump. This method can be used on our carbon shoe pumps and the Ryton cavity-style pumpheads. Maximum temperatures of 250 °F are recommended to prevent distortion of the gears/shoes.

  • The second method is to remove the pump from the motor and sterilize the entire pump as one piece in an autoclave. This is most effective on the cavity style pumpheads. The carbon shoe pumps can also be sterilized using this method, however, the procedure may take longer because these pumps have more air space in the magnet cup.

  • The third method involves complete disassembly of the pump, sterilizing the parts separately, then reassembling the pump. This will apply to all product series, noting the temperature restrictions by material.

  • The last common method is to blow steam through the pump when it is not running. The effectiveness is marginal because the steam may not reach the magnet cup. This should not be used on the suction-shoe design due to possible displacement of the shoe from the gears. The PTFE gears in the cavity style may swell due to the temperature of the steam and block flow to the outlet.

Q: How do I identify the recommended tubing size by Micropump product series?

The following are general recommendations for maximum performance using low viscosity fluids (under 100 cps) and motor speeds under 3450 rpm. Using smaller ID tubing will increase the load on the pump, resulting in lower flow and/or pressure conditions; cavitation/decoupling are potential outcomes:

  • Series GA 1/4" ID

  • Series GJ 1/4" ID

  • Series GB 1/4" ID

  • Series GC 1/2" ID

  • Series GL 3/4" ID

  • Series CA 3/8" ID (outlet), 1/2" ID (inlet)

Q: How do I know which pump and motor can be assembled together?

Standard pumps and motors carry mounting designations (i.e.: A, B, C, G, & F mounts). Pump and motor mount designations must match. Consult your local Micropump distributor for further details.

Q: What are your terms of sale?

Please click on the link below to access Micropump's Terms and Conditions

Q: How do I send a wire transfer to Micropump?

Please send to:

Micropump 100 West 33rd St

New York, NY 10001

Bank: Bank of America

Account Number: 8765361607

Routing ABA Number: 0260-0959-3


CHIPS Address: 0959

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