Graco 222198 Pressure Drain Valve Kit

The Graco 222198 Pressure Drain Valve Kit is designed to safely relieve system pressure in many Graco airless sprayers, ensuring safe maintenance and smoother operation.

Max Pressure: 5000 PSI
Thread Size: 1/4" NPT (male)
Handle Type: Thumb-screw for quick operation
Used On: EM 590, Ultra 750, Ultra 500 & 1000, GM 5000, GH 533, 390 EM
Function: Relieves trapped paint pressure before service

List Price: $154

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Description

Compatible Machines (Verified Models & Series)

EM 590
- 590 EM Bare – 231590
- 590 EM Bare – 220856
- 590 EM Bare (Non-Sleeved Pump) – 222586 (Series A–D)
Ultra 750
- 750 Ultra Hi-Boy (Non-Sleeved Pump) – 231033 (Series A–B)
- 750 Ultra Hi-Boy (Sleeved Pump) – 231042 (Series A–B)
- 750 Ultra Lo-Boy (Non-Sleeved Pump) – 221130 (Series A–B)
- 750 Ultra Lo-Boy Bare – 221120
- 750 Ultra Plus Bare – 231407
- 750 Ultra Plus – 231573
Ultra 500 Series
- 500 Ultra Bare – 231032 (Series A–C)
- 500 Ultra Complete – 231041 (Series A–C)
- 500 Ultra Lo-Boy Bare – 231054 (Series A–C)
Ultra 1000 Series
- 1000 Ultra (Non-Sleeved Pump) – 231043 (Series A)
- 1000 Ultra Bare – 231034
- 1000 Ultimate Nova (Non-Sleeved Pump) – 820053 (Series A)
- 1000 Ultimate Nova (Sleeved Pump) – 820045 (Series A, C)
Ultimate 500 Series
- 500 Ultimate Hi-Boy – 820105
- 500 Ultimate Lo-Boy – 820170
- 500 Ultra Bare – 231032 (Series A–C)
- 500 Ultra Complete – 231041 (Series A–C)
GM 5000
- 5000 GM Lo-Boy – 222488 (Series A)
- 5000 GM Convert (Bare) – 231316
- 5000 GM Hi-Boy – 231052 (Series A–C)
- 5000 GM Hi-Boy – 220886 (Series A–C)
GH 533 (30:1 Bulldog)
- 533 GH Bare – 231533 (Series A–B)
- 533 GH Complete – 230974 (Series A–B)
390 EM
- 390 EM Bare – 231001
- 390 EM – 231390

What is the Graco 222198 Pressure Drain Valve Kit?

The Graco 222198 Pressure Drain Valve Kit (also shown as “222-198”) is a factory part used to safely relieve/bleed fluid pressure on many legacy Graco airless sprayers. It’s a thumb-screw style drain/prime/relief valve that lets you depressurize the system before service, filter/tip changes, or storage.

Key Specifications

Part Number	222198 (Kit, Valve, Drain, Pressure)
Function	Pressure relief / drain (prime) valve for safe depressurization
Max Working Pressure	5000 PSI
Connection	1/4" NPT (male)
Handle	Thumb-screw type for quick, tool-free operation
Included	Valve assembly; consult your model parts diagram for exact kit contents

Why this part matters

Improves safety by preventing unexpected high-pressure discharge.
Simplifies service: change tips/filters and perform maintenance without fighting trapped pressure.
Protects hoses, seals, and pump components from pressure-related damage.

Fit Notes & Installation Tips

Verify your exact model/series (and whether the pump is sleeved vs non-sleeved) against your unit’s parts book before ordering.
Confirm the 1/4" NPT port and 5000 PSI rating suit your sprayer.
Use proper thread sealant where specified by Graco; avoid over-tightening.
After installation: power off, rotate open to relieve pressure, confirm zero pressure, then service.

Frequently Asked Questions

Not all. It fits a wide list of legacy EM 590, Ultra 750, Ultra/Ultimate 500 & 1000, GM 5000, GH 533, and 390 EM variants noted above. Always match the model and series in your parts manual to confirm the valve style and thread.

The kit is rated to 5000 PSI and uses a 1/4" NPT male connection.

Signs include leakage from the valve, inability to relieve pressure, difficult priming, or inconsistent pressure bleed-down when opened. Inspect threads and sealing surfaces as well.

Follow the guidance in your sprayer’s manual. Many installations call for a compatible thread sealant on NPT threads; do not over-apply and avoid contaminating the valve interior.

The core drain/relief valve assembly (thumb-screw style). Exact contents can vary by revision—confirm with your model’s illustrated parts list.