FAQs

Components — Frequently Asked Questions

Can your pumps pump water?

Dynex pumps can pump a lot of different fluids under a wide range of conditions. Water unfortunately does not provide enough lubrication between the bearings and pistons to operate successfully. Our water based products (PF1300, PF4300) are designed to operate on fluids that are up to 95% water.

If you have an application that uses a fluid with a high concentration of water, please contact Dynex to discuss the application.




What are standard SAE ports / fittings?

Our ports conform to SAE specification J1926/1 / ISO 11926-1. Fittings are supplier specific. Please consult fitting manufacturer for pressure limits.

What are Autoclave ports / fittings?

A brand of coned and threaded connection used for sealing at higher pressures. These are available in three pressure ranges. Up to 15,000 psi (low pressure), 20,000 psi (medium pressure) and 60,000 psi (high pressure).

What are the ideal inlet conditions for a checkball pump?

Recommended inlet condition depends on specific pump model. All checkball pumps perform best with at least a positive head.

When is a supercharged inlet necessary?

That depends on the pump model and fluid viscosity. Refer to literature for the specific minimum inlet pressure for specific pump models or contact the Dynex Sales Department.

What is the definition of “Intermittent Duty Cycle”?

A Duty Cycle is defined as the relationship between the active (operating) time and the inactive (resting time) of an equipment or machine. Intermittent duty depends on the operating conditions. We recommend you submit a Pump Application Worksheet or consult the Dynex Sales Department for the best recommendation as to which model pump to select for your application.

Can I orient a checkball pump in any direction?

Yes, provided the air bleed/drain for the particular pump model is oriented up and is accessible.

What is the Minimum / Maximum speeds to run a Checkball pump?

Minimum / Maximum speeds depend on the specific pump model and fluid type. Refer to Dynex literature for the maximum speed and consult the Dynex Sales Department for the minimum speed for specific model pumps.

Can you provide a pump/motor package?

Yes. Contact the Dynex Sales Department for details.

Do you provide options beyond what is published?

Yes. Submit a completed Application Worksheet for review.

Power Units — Frequently Asked Questions

What is the maximum flow rate for your units?

There is not a limit, but flows above 70 GPM may require multiple pumps.




Do you offer electronic controls with your units?

Yes, we can offer complete combination motor starters.

What materials do you offer to build the units from?

Mild steel, stainless steel, and aluminum.

Can you provide drawings and documentation on custom built units?

Yes, assembly drawings, schematics, and service manuals are available.


What fluids can your power units operate on?

Numerous, including standard oils, water glycols, Skydrol fluids, MIL-SPEC fluids, fire retardant fluids.

Do you test the units before shipping?

Yes. Some special fluids and higher pressures may limit the testing capability.

Can you offer custom color paint on the units?

Yes, we can computer match customer supplied paint samples.

What is an average lead-time on a unit?

Lead-time depends on component availability and labor hours. A small basic unit (less than 5 GPM) can ship in 4 to 5 working days. Most custom units (less than 20GPM) ship in 3 to 4 weeks while larger custom units ship in an average of 8 to 10 weeks.

Do you stock standard units?

No, all units are built at time of order. Basic units can ship within 4 to 5 working days after receipt of purchase order.

Do you offer diesel or gasoline power units?

Yes, we can offer both engine types in addition to the electrical motor power units.

Can you offer custom fabricated equipment bases or drip trays with your units?

Yes, we have fabricating and welding capabilities.

Do you offer sound enclosures with your units?

Yes, we can supply both removable panel type, and full free standing sound enclosures.