Generic 4040
Humidifier Solenoid Valve 24v (Covna Brand)
Price:$24.90

Replacement solenoid valve for the Aprilaire 4040 made by Covna Valve of China. They have designed this valve as an exact replacement of the Aprilaire brand model 4040. Even the inner parts are interchangeable with the Aprilaire. Covna Valve is an international brand renowned for applying German fluid control technology in their valve design. They are ISO9001 certified.

The valve body has a filter on the inlet side. Same as the Aprilaire 4040 having the 4004 strainer. This filter is interchangeable with the 4004 but made different, as it is a sintered porous brass filter.

Specifications printed on solenoid body: 24 volts, 60 Hz, Orifice (3/32 - 3/64).

Both the inlet and outlet are threaded 7/16"-24 UNS for accepting a compression fitting for ΒΌ" tubing. The inlet includes the compression fitting & ferrule. For the outlet, your existing compression fitting is reused.

Aprilaire 4040 Comparison

Shown below is the Covna versus the Aprilaire 4040. They are manufactured the same.

Aprilaire 700 Humidifier Return Duct Mounting Location 16 x 18 x 10-3/4

Aprilaire In-Line Strainer & Orifice

Aprilaire Flow-Thru humidifiers have a solenoid with a small strainer filter in the body. These strainers should be inspected and cleaned when replacing the water panel. If the strainer becomes clogged the water pressure will tear it and pieces will jam the solenoid or loose pieces will block the orifice.


Aprilaire 24 Volt Solenoid
Aprilaire 4004 InLine Strainer Aprilaire 4231 Yellow Orifice
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