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Graco 164864 Plate Diaphragm Zinc Alloy

Graco 164864 Plate, Diaphragm—zinc-alloy support plate used inside diaphragm-type regulators and back-pressure valve assemblies. Verify fit by matching the part number in your machine’s service manual.

  • Material: Zinc alloy
  • Role: Supports diaphragm for stable pressure control
  • Location: Regulator / back-pressure valve assembly
  • Fit check: Listed as 164864 in your parts diagram
  • Service tip: Replace with diaphragm if wear is visible

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Part Overview & Specs for Diaphragm Plate 164864

Compatible Machines

This plate is used inside specific Graco diaphragm-type regulators and back-pressure valve assemblies. Add a machine to this list only if its service manual lists part 164864 in the regulator/valve assembly.

  • Sprayers that use Graco Fluid Regulator assemblies referencing part 164864 (see regulator parts list).
  • Systems that use Graco Back-Pressure Valve assemblies referencing part 164864 (see valve parts list).

Part Details

Part Number 164864
Part Name Plate, Diaphragm
Material Zinc alloy
Typical Location Inside diaphragm-type regulator or back-pressure valve assembly
Approx. Size (ref.) Inner Ø ≈ 0.4″, Outer Ø ≈ 2.4″ (verify against your assembly)
Function Provides rigid support to the elastomer diaphragm; maintains sealing and response characteristics

Compatibility Notes

  • Match by part number in your sprayer’s regulator/valve parts list.
  • If your machine uses a different diaphragm plate number, do not substitute without confirming dimensions and stack-up.
  • When servicing, inspect mating diaphragm, screws, and seals; replace worn items together for best performance.

Frequently Asked Questions

It supports the diaphragm inside the regulator/valve, helping maintain correct shape and preload so the assembly can control pressure and respond smoothly to flow changes.

Open your sprayer’s service manual and find the regulator or back-pressure valve exploded view. If the parts list explicitly shows 164864, this plate is the correct replacement. If not shown, do not assume compatibility.

It’s best practice to replace the diaphragm and plate together if either shows wear, distortion, or corrosion. Mixing worn and new components can shorten service life and affect regulation stability.

Clean mating surfaces, observe orientation of the plate vs. diaphragm, and torque hardware to spec from your manual. After reassembly, verify there are no leaks and the regulator responds smoothly under pressure.

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