Dultmeier Sales will be closed Thursday, November 25th and Friday, November 26th in observance of Thanksgiving

Dultmeier Sales will be closed Friday, December 24th.
Normal operations will resume Monday, December 27th. We wish you and your family a very Merry Christmas!

Dultmeier Sales will be closed Friday, December 31st in observance of
New Year's Day

Dultmeier Sales will be closed Monday, July 5th in observance of Independence Day.
Normal operations will resume Tuesday, July 6th. We wish you a happy 4th of July!!

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If you are running into issues, please phone your order in to 1-888-677-5054

Customer Pickup Orders: to help reduce exposure for our customers and our employees, if you are placing an order for in-store pickup please call in your order ahead of time or place your order online and pre-pay with a credit card. Be sure to let us know when you plan to arrive. We will have your merchandise ready for you and will greet you outside our facility. Thank you for your help!

Regulator vs Unloader Valve | Video

CAT Pumps® elaborates on the difference between a pressure regulator and a pressure regulating unloader valve. Both products set and maintain consistent system pressure, and both offer protection from over-pressurization.

View our other Cat Pumps videos here!


Pressure regulators and unloader check valves both perform roughly the same function in controlling pressure inside a pump. System pressure is maintained by regulating the amount of flow through the bypass port. The difference between regulator and unloader occurs when flow downstream is stopped. A regulator redirects flow through the bypass port, maintaining full system pressure. An unloader valve closes the fluid passageway and traps pressure in the discharge line. This forces water along a passageway above the check valve, opening the bypass port.

Neither product is directly better, as both perform well in different areas. The check valve, for example, reduces wear and energy consumption, as well as reduces heat rise. A regulator, on the other hand, allows for a constant pressure and for excess flow to be redirected.