509# Golden Valve Plate For Denso Common Rail Injectors — Product Details

The 509# valve plate (also known as orifice plate or control valve plate) is a crucial hydraulic metering component in Denso common rail injectors. It governs fine fuel flow and pressure control between the injector's high-pressure chamber and its internal control chambers. Because it directly affects injection timing, response, and stability, the 509# plate must meet exacting tolerances and material standards.

 

 

High-Precision Flow Metrology
Each 509# plate is laser-etched and CNC-finished to strict dimensional tolerances. The orifice bore size and flow edges are micro-machined to ensure consistent hydraulic response and minimize variability between units.

Optimized Materials & Surface Treatment
Manufactured from heat-treated stainless or alloy steels and often coated with corrosion-resistant finishes, these plates resist wear and pitting even under high-pressure fuel service and exposure to modern diesel additives.

Fine Control & Stability
The plate ensures stable fuel metering under transient conditions. Its design helps reduce pressure fluctuations, support multiple injection events per combustion cycle, and minimize hydraulic hysteresis.

Full Batch Traceability
Every plate is stamped with a unique trace code or serial number, enabling tracking throughout its lifecycle for quality assurance and warranty claims.

Rigorous Pre-Delivery Inspection
Before shipment, each plate undergoes dimensional, hydraulic, and leak testing to validate conformity to specification.

 

 

The 509# valve plate is widely used in Denso G3-type injectors and other Denso common rail models. These injectors are found in:

Light-duty and medium-duty trucks

Diesel-powered passenger vehicles

Industrial and generator engines

Typical OEM injectors that use 509# valve plates include part numbers like 095000-6222, 095000-6700, 23670-30190 among others 

Maintenance & Replacement Guidelines

Inspection
During injector rebuild, inspect the existing valve plate for wear, scoring, or erosion. Even minor damage can degrade control.

Replace, Don't Reuse
Valve plates are very sensitive parts. It's best to always install a new 509# plate rather than reuse the old one.

Torque & Cleanliness
When assembling, follow proper torque specs for injector subsystems and ensure all parts are ultra-clean to prevent contamination damage.

Balance Test
After installation, perform a balance or flow test to check that all injectors using the 509# plate deliver uniform flow characteristics.

Monitor Performance
Keep an eye on erratic idle, smoke, or pressure fluctuation codes (e.g. low rail pressure). These may indicate plate degradation over time.

 

 

✅ High Precision CNC Manufacturing – Machined to ultra-tight tolerances for consistent fuel regulation.
✅ Micro-Polished Orifice Design – Guarantees smooth hydraulic response and stable injection timing.
✅ Durable Alloy Steel Construction – Heat-treated for maximum wear and corrosion resistance.
✅ Laser-Etched Trace Code – Enables complete batch tracking and quality verification.
✅ OEM-Level Compatibility – Fits Denso G3 series injectors: 095000-6222, 095000-6700, 23670-30190, and others.
✅ Performance Tested – Every plate undergoes flow and leakage inspection before shipment.
✅ Ideal for Injector Repair Specialists – Compatible with test benches, rebuild kits, and remanufacturing operations.

 

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