Graco 15A209 Lower Diaphragm Housing – OEM Regulator Base Housing
The Graco 15A209 Lower Diaphragm Housing is a robust OEM component that forms the structural base of the diaphragm chamber in Graco regulator assemblies. It provides the foundation for the diaphragm to act against, ensuring stable pressure regulation and proper sealing under high‑pressure conditions.
Product Overview
This housing is engineered to hold the diaphragm, spring plate, and packing assembly securely in place. It supports the internal geometry of the regulator so that the diaphragm movement remains controlled and stable, helping to prevent fatigue or misalignment. As a genuine Graco part, it ensures exact fitment and compatibility with Graco regulator models designed for the 15A209 component.
Key Features
- OEM Graco genuine part — Part Number: 15A209
- Precision‑machined metal housing for reliable durability
- Supports diaphragm chamber for stable and precise regulator operation
- Maintains alignment of spring plate, packing, and diaphragm assembly
- Ensures long service life and reduces downtime by maintaining internal integrity
Technical Specifications
| Part Number |
15A209 |
| Description |
Lower Diaphragm Housing / Base of Regulator |
| Material |
High‑strength metal alloy (factory‑specified) |
| Function |
Houses diaphragm chamber and internal regulator components |
| Application |
Fluid / back‑pressure regulators in Graco finishing systems |
Compatible Systems
- Graco mechanical and pneumatic regulators that list the 15A209 housing in their parts breakdown
- Regulator assemblies using a diaphragm as the control element and requiring a rigid base housing
Installation Guidelines
Correct installation of the Graco 15A209 Lower Diaphragm Housing is essential to maintain regulator accuracy and longevity:
- Ensure the system is fully depressurized and drained before servicing.
- Disassemble the regulator to remove the existing lower housing, noting the location of the diaphragm and spring assembly.
- Inspect the diaphragm, spring plate, and packing for wear or damage before proceeding.
- Clean the mating surface of the new housing thoroughly and then install the 15A209, ensuring alignment and fitment.
- Reassemble the diaphragm, spring plate, packing, and regulator cap, torque fasteners to specification.
- Slowly repressurize the regulator and conduct a leak‑test and function check before returning to full operation.
Maintenance Recommendations
- Inspect the housing during regular maintenance or when regulator performance deteriorates.
- Check for cracks, corrosion, or deformation in the housing body or mating surfaces.
- Replace the housing if structural damage is found, to prevent misalignment or diaphragm malfunction.
- Always clean and lubricate mating surfaces and ensure correct torque on fasteners during reassembly.
Frequently Asked Questions
It acts as the foundational base of the regulator’s diaphragm chamber, supporting the diaphragm, spring plate, and related internals for accurate pressure control.
Yes, the 15A209 Lower Diaphragm Housing is a factory‑specified Graco component designed for compatibility with Graco regulator assemblies.
It is used in Graco fluid‑pressure and back‑pressure regulator models which list the 15A209 in their detailed parts list.
If you detect misalignment, cracks, leaks, or structural damage in the regulator’s base, replacing the 15A209 Housing helps restore proper diaphragm chamber integrity.
