Graco 24B156 HD Prime Valve

Graco 24B156 HD Prime Valve is a heavy-duty OEM replacement that ensures reliable priming and smooth pressure control for professional Graco sprayers.

Fits Ultra Max II 695, 795, 1095, 1595
Also compatible with TexSpray Mark IV, V, X series
Replaces older valve part 24A381
Built for durability and leak-free performance

List Price: $178

You save: $22.25 (12.50%)

Sale Price: $155.75

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Description

HD Prime Valve 24B156 — Functions, Specs & Compatibility

Compatible Machines

This Graco 24B156 HD Prime Valve is used on professional, large-frame electric airless sprayers. Confirm by serial/model plate before ordering.

Ultra Max II 695 — Standard / ProContractor / IronMan
Ultra Max II 795 — Standard / ProContractor / IronMan
Ultra Max II 1095 — Standard / ProContractor / IronMan
Ultra Max II 1595 — Standard / ProContractor / IronMan
TexSpray Mark Series — Mark IV, Mark V, Mark X (Standard / ProContractor / IronMan)

Product Overview

The Graco 24B156 HD Prime Valve (Heavy-Duty) controls flow during priming and recirculation, purging air from the fluid section for consistent spray pressure and smooth startup.

OEM Graco component for durability and sealing performance
HD design for high-duty, high-output sprayers
Direct-fit replacement for select Ultra Max II and TexSpray Mark units

At-a-Glance Specifications

Part Number	24B156
Type	HD Prime Valve (Heavy-Duty priming/recirculation valve)
Replaces / Supersedes	24A381 (older prime valve on many of the same platforms)
Application	Priming, de-aeration, and recirculation of coating prior to spraying
Compatibility Family	Ultra Max II 695/795/1095/1595; TexSpray Mark IV/V/X (verify by model/serial)
Includes	Prime valve assembly (HD); thread-patch/seal as applicable

Why Choose 24B156

Reliable sealing helps prevent recirculation leaks and pressure drop
Smoother starts by quickly purging air from the pump and hose
OEM fit for fast swap-in service on supported sprayers

Fitment Guidance

Match your sprayer family and size to the list under Compatible Machines.
Confirm part number in your unit’s parts manual; some builds use updated prime-valve blocks.
When replacing older 24A381, verify the block style and thread configuration.

Installation & Maintenance Tips

Depressurize and follow lock-out procedures before service.
Inspect manifold seat and O-rings; replace worn seals to ensure leak-free operation.
Apply manufacturer-approved thread sealant where specified; avoid over-torquing.
After install, prime to a waste pail until air is fully purged and flow is steady.

Frequently Asked Questions

Yes—on many Ultra Max II 695/795/1095/1595 and TexSpray Mark units, 24B156 is the heavy-duty successor to 24A381. Always confirm against your model’s parts list.

Typically no. The 24B156 HD Prime Valve is designed for professional, large-frame sprayers (e.g., Ultra Max II and TexSpray Mark). Magnum units use different prime valve assemblies.

Difficulty building pressure, paint recirculating when switched to “spray,” external leakage around the valve, and inability to purge air efficiently are common signs the prime valve needs service or replacement.

Always depressurize the system, follow the sprayer manual, use approved thread sealant if called for, and tighten to manufacturer specs. After installation, prime to waste until flow is steady (no air).

Check your unit’s parts breakdown by model number and serial range. If your sprayer appears in the Compatible Machines list, match the prime valve call-out in the manual to 24B156.