Graco 239937 Piston Valve
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(1 review)
$66.02
$72.00
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The Graco 239937 Piston Valve is a genuine OEM replacement part designed for maintaining proper fluid flow and pressure in your airless sprayer’s pump section. It ensures consistent performance and prevents pressure loss during spraying.
- Maintains proper pump suction and discharge flow
- Ideal for Ultra, Ultra Max, and 190ES sprayers
- Restores lost pressure and spray consistency
- Durable OEM stainless and metal body construction
Quantity
Genuine OEM Part
Fast Shipping (Order by 1 PM CST)
Easy Returns
Product Overview: Graco 239937 Piston Valve
The Graco 239937 Piston Valve is a critical pump valve that controls fluid flow in select Graco airless sprayer fluid sections. It helps restore pressure, prime consistency, and long-term sealing performance when the original valve is worn.
Compatible Machines
This valve is used on the following Graco airless sprayer families / generations (check your exact model or pump part list to confirm fit):
- Ultra 390 / 395 (select generations)
- Ultra 490 / 495 / 595 (select generations)
- Ultra Max 695 (commonly listed for 1st & 2nd series)
- 190ES (select units)
Key Features & Quick Specs
| Part Number | 239937 (also written as 239-937) |
|---|---|
| Function | Pump piston check/valve controlling intake & discharge flow in the fluid section. |
| Typical Construction | Metal body, stainless/seat components (OEM configuration as supplied by Graco). |
| Common Use Cases | Loss of pressure, hard priming, pulsation, or leakage due to a worn piston valve. |
| Cross-Reference | Replaces 239-937. Also available within select rod/valve kits (see below). |
Related Pump Rod / Valve Kits
- 24W617 – Piston Valve & Rod Kit for PC fluid sections (contains valve 239937)
- 249125 – Rod & Piston Kit for standard (pinned rod) models
Fit & Identification Notes
- Compatibility can vary by generation and fluid section even within the same model family.
- Confirm by checking your sprayer’s pump bill of materials (BOM) or the label on your existing fluid section.
- If your pump number matches one of the Graco pump assemblies that use this valve (e.g., 17C487, 17C488, 17C489, 17C721, 17M992, 24Z731), 239937 is typically correct.
Frequently Asked Questions
Match your model family, generation, and fluid section against your parts list. If your pump assembly is listed among common matches (e.g., 17C487/17C488/17C489/17C721/17M992/24Z731) or your manual lists 239937, you’re good to go. When in doubt, share your model & serial for a check.
Hard priming, loss of pressure at the gun, pulsation/surging, paint bypass or leakage into the wet cup, and inconsistent spray pattern are common signs the piston valve/seat is worn and needs replacement.
If your rod is in good condition, the 239937 valve may be all you need. If the rod is pitted, bent, or worn, consider the appropriate kit (e.g., 24W617 for PC sections or 249125 for standard sections) to restore sealing and longevity.
Clean the fluid section thoroughly, inspect the seat & rod, use proper torque per the service manual, and replace any damaged seals or packings. A lightly oiled, clean assembly helps avoid galling and ensures proper seating on first start-up.
OEM configurations are metal-body with stainless components appropriate for professional water-borne and many solvent-borne coatings. Always follow coating compatibility guidelines in your sprayer manual.
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Margaret R.
Grabbed one of these on a recommendation, and for the 239937 Piston Valve (Part #239937) and shipping was quick and the part was packaged well. Glad we found the exact part number we needed.
