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Graco 104128 By-Pass Valve

The Graco 104128 By-Pass Valve ensures consistent system pressure by automatically redirecting flow when a filter becomes clogged or pressure rises.

  • OEM Graco part for reliable performance
  • Protects filters and prevents pressure spikes
  • Used in select Graco filter and valve assemblies
  • Replace during maintenance to maintain system efficiency

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Function & Technical Details

The Graco 104128 By-Pass Valve is an OEM flow-control component used within select filter/valve assemblies on Graco spray systems. It helps protect the system by diverting flow when differential pressure rises (e.g., from a clogged filter), supporting continuous operation and preventing element damage.

Compatible Machines

Model-specific fitment for the Graco 104128 By-Pass Valve depends on the filter assembly used in your sprayer. A confirmed compatibility list is not currently available. Please verify against your machine’s parts list or service manual before ordering.

Key Specifications

Part Number 104128
Part Name By-Pass Valve
Manufacturer Graco (Genuine OEM)
Primary Function Opens to divert/recirculate flow when filter differential pressure rises, helping prevent element collapse and maintaining system flow.
Typical Location Inside a Graco filter/valve assembly used on select spray units.
Service Notes Inspect seat and moving surfaces for wear; replace associated O-rings/seals as specified in your sprayer’s manual; follow pressure-relief procedure before servicing.

Highlights

  • OEM quality: Genuine Graco component designed for correct fit and performance.
  • System protection: Helps maintain flow when filters load up, reducing unplanned downtime.
  • Maintenance friendly: Replaceable part within the filter assembly; pair with fresh seals during service.

Installation & Safety

  • Always follow the machine’s pressure-relief procedure before disassembly.
  • Confirm orientation and seating of the By-Pass Valve within the housing.
  • Use only compatible lubricants/sealants; torque fasteners per the service manual.
  • Function-check: after reassembly, monitor for leaks and verify stable system pressure.

Frequently Asked Questions

Compatibility depends on the specific filter/valve assembly in your sprayer. Check the parts list for your exact model or consult Graco support to confirm that 104128 is specified for your unit.

Unusual pressure fluctuations, frequent filter element damage, poor flow when filters load up, or recirculation that doesn’t occur under high differential pressure can indicate a worn or stuck By-Pass Valve.

Yes—replace O-rings and any specified backups during service to ensure proper sealing and long-term reliability. Use only parts and materials listed for your sprayer family.

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