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Graco 166065 Plate Valve

Essential fit and function details to help you verify before ordering.

  • OEM part no.: 166065
  • Type: valve plate for pump check-valve stack
  • Fit rule: confirm 166065 appears in your pump’s parts list
  • When to replace: loss of prime, pressure drop, pitted sealing face
  • Install: follow manual orientation; keep mating surfaces clean
  • Pack: 1 piece

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Compatibility & Specs Overview

Compatible Machines

Model-specific coverage for this part is not published as a single list. Use the bullets below to verify fit before ordering.

  • Graco industrial piston/hydraulic pump lowers that list part number 166065 in their service/parts manual.
  • Selected stainless-steel 1000 cc (2 in / 51 mm inlet class) lower assemblies specifying this valve plate in the check-valve stack.
  • Bulk fluid transfer and coating pumps where the valve plate callout matches this part number.

The Graco 166065 Plate Valve is a flat valve element used in the pump’s check-valve assembly to control one-way fluid flow and maintain prime and pressure under load.

Key Benefits

  • Restores sealing surface in the check-valve stack to recover flow and pressure.
  • OEM geometry and finish for reliable seating and reduced bypass.
  • Direct part-number replacement — no field modification required when specified by your manual.

Specifications

OEM Part No. 166065
Part Type Valve plate (check-valve component)
Function Provides flat sealing surface to direct one-way fluid flow in the pump lower
Typical Location Valve housing / pump lower assembly (industrial piston/hydraulic units)
Packaging 1 piece
Authenticity Genuine Graco replacement part

Fitment & Use Notes

  • Always confirm the part number in your equipment’s service manual before purchase.
  • Inspect mating surfaces (seat, gasket, retainers) and replace worn components together for best results.
  • Install with the orientation shown in your manual; incorrect orientation can cause low output or loss of prime.
  • Flush contaminants from the fluid path after installation to prevent premature wear.

Frequently Asked Questions

Check the exploded parts diagram for your pump lower. If the valve plate callout shows part number 166065, this is the correct replacement. If your diagram lists a different number, use that exact callout instead.

Hard starting, loss of prime, pulsation, reduced flow/pressure, or visible pitting/warping on the plate surface. Contaminants embedded in the sealing face are also a common cause.

It’s best to keep components matched to OEM specifications. Mixed components may alter thickness/flatness and compromise sealing, causing chronic priming or pressure issues.

Typically no special tools beyond standard hand tools and a torque wrench (follow your manual). Keep components clean and handle the plate carefully to avoid scratching the sealing face.

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