Graco 249177 Piston Valve - Aftermarket Replacement | Bedford 58-3182

Drop-in piston valve for GMax II 7900 and Gas Hydraulic (GH) rigs that restores pump sealing and steady output. This aftermarket alternative references Graco 249177 and Bedford 58-3182 for dependable service in field rebuilds.

Aftermarket Precision-Machined Industrial Duty

Why Choose This Piston Valve

  • Matched geometry for smooth priming and consistent pressure.
  • Built for demanding job sites; supports heavy spray loads.
  • Direct replacement in the pump lower - no modifications required.

Service cue: Inspect the sleeve and rod for scoring before installation; replace worn parts to protect the new valve.

Typical Compatibility

  • GMax II 7900 gas airless sprayers.
  • GH 200, GH 230, GH 300 hydraulic sprayers.
  • Other Graco pump lowers that specify this piston valve in the parts list.

Verify your model and series letter against the pump exploded diagram before ordering.

What This Product Fits

  • Graco GMax II 7900.
  • Graco GH 200.
  • Graco GH 230.
  • Graco GH 300.

Always confirm your pump lower bill of materials for exact valve callout.

Technical Specifications

Aftermarket Bedford Precision Parts 58-3182
OEMGraco 249177
FitsGMax II 7900; GH 200/230/300 (check specific series)
TypePiston valve (pump lower component)
MaterialHardened steel valve body and seat interface
FunctionControls intake/pressure sealing for steady output and prime
PressureUse within sprayer rated working pressure per manual
BrandBedford Precision Parts (Aftermarket)

Lubricate per pump manual and torque to spec; re-check fasteners after initial run-in.

Installation Notes

  1. Relieve pressure and isolate power/fuel following safety procedures.
  2. Disassemble the pump lower; remove the existing piston valve.
  3. Inspect rod, sleeve, and seats; replace worn components.
  4. Install the new valve, observing orientation and threadlocker use where specified.
  5. Reassemble, prime with compatible fluid, and verify no leakage at operating pressure.

Tip: If pressure hunts after rebuild, check inlet screens and packings before re-adjusting settings.

When to Rebuild / Replace

  • Loss of prime or delayed pressure build.
  • Pulsation at the gun despite a functioning regulator.
  • Visible wear or scoring on the valve/seat.
  • Persistent weeping or backflow in the pump lower.

Bedford vs OEM Comparison

FeatureBedford Aftermarket (58-3182)OEM (Graco)
Fit & InterfaceDirect replacement in listed GMax/GH pump lowersFactory-specified component
MaterialsHardened steel construction for wear resistanceOEM-specified materials
AvailabilityIf in stock, ships from Bedford Precision Parts in Bedford Hill, New York.Ships via Graco distribution
ValueCost-efficient service optionOEM program

FAQs

Yes, Bedford 58-3182 is an aftermarket alternative referenced to the OEM valve for the models listed.
GMax II 7900 and GH 200/230/300 (confirm your series and pump lower parts list before purchase).
Inspect the sleeve, seats, and packings. Replace any worn components to protect the new valve and restore performance.
Follow orientation in the parts diagram, apply threadlocker where specified, and torque per the service manual. Re-check fasteners after first run.
If available, orders ship from Bedford Precision Parts in Bedford Hill, NY using your selected carrier.