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!!

We are experiencing some technical difficulties on dultmeier.com and apologize for any inconvenience.
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!

Unloader Check Valve Explained | Video

A video demonstration on how to check an unloader check valve, particularly if the valve is stuck in bypass or if it's loading incorrectly. The video also explains how unloader check valves operate in detail.


Unloader valves operate as a pressure regulator inside the sprayer. When fluid is cut off, the valve redirects it to a bypass port that leads back to the pump. The valve cycles through two phases, open or closed, and only redirects fluid when closed.

There are two types of unloader valves, trapper pressure valves and flow actuated valves. A trapped pressure valve redirects fluid based on spikes in pressure. This type of valve often causes the gun to "kick". Flow actuated valves redirects fluid based on the interruption of water flow. Trapped pressure valves are more commonly used.