10752A-3 - Rocker Solenoid Co - Diaphragm Regulator

10752A-3 – Woodward Solenoid-Operated Diaphragm Regulator Valve

Available now on the Airparts.aero Marketplace.

Overview

The Woodward 10752A-3 is a flight-critical, solenoid-operated diaphragm regulator valve, primarily utilized within the fuel control systems of gas turbine engines, such as the Honeywell TFE731. Its core function is typically to regulate a control pressure (often P3 bleed air) that actuates other fuel system components, most notably the Pressurizing and Drain Valve (P&D Valve). The P&D valve plays a crucial role during engine start and shutdown sequences, ensuring proper fuel manifold pressurization and preventing post-shutdown fuel leakage into the combustor, which can cause coking and hot section distress.

This regulator valve employs an electromechanical solenoid to actuate a rocker arm mechanism, which in turn modulates the position of a diaphragm assembly. This action precisely controls the flow or pressure of the operating medium (air or fuel) passing through the valve. Manufactured to the exacting standards of Woodward, a leader in aerospace control systems, the 10752A-3 is engineered for high reliability and consistent performance within the demanding thermal and vibratory environment of a turbine engine. Its correct function is essential for reliable engine starting, stable operation, and proper shutdown procedures.

Key Features

• Solenoid Actuation: Utilizes a robust, electrically actuated solenoid for precise, rapid control based on signals from the engine control system or cockpit switches.

• Diaphragm Regulation: Employs a sensitive diaphragm assembly to accurately modulate control pressure or flow.

• Rocker Arm Mechanism: Incorporates a simple, reliable rocker arm (lever) to transfer motion from the solenoid plunger to the diaphragm.

• High-Reliability Design: Engineered and manufactured for the extreme temperature, pressure, and vibration environment associated with turbine engines.

• Critical Fuel System Component: Essential for the proper sequencing and operation of other fuel system components, particularly the Pressurizing and Drain (P&D) Valve.

• OEM Certified Performance: As a genuine Woodward component, it guarantees the correct performance parameters required by the engine's type certificate.

Technical Specifications

• Part Number: 10752A-3

• Component Type: Solenoid-Operated Diaphragm Regulator Valve

• OEM Manufacturer: Woodward, Inc.

• Operating Medium (Typical): P3 Bleed Air or Fuel System Control Pressure. Must be confirmed via engine manual.

• Actuation Voltage (Typical): 28 VDC. Must be confirmed via engine manual.

• Material: Body typically Corrosion Resistant Steel (CRES) or high-strength aluminum alloy suitable for fuel/air and engine temperatures. Must be confirmed by OEM documentation.

• Governing Specification: Woodward Engineering Drawings and Specifications; Engine Manufacturer Specifications.

Aircraft Compatibility

This regulator valve is primarily associated with the Honeywell TFE731 series turbofan engines, which power a wide range of business jets.

• Engine Application: Honeywell TFE731 Series (various models).

• Representative Aircraft Platforms (Engine Dependent):

  • Cessna Citation III, VI, VII

  • Dassault Falcon 10, 50, 900

  • Learjet 31, 35, 36, 40, 45, 55, 60

  • Hawker 750, 800, 850XP, 900XP

Note: Verification of applicability is the absolute responsibility of the installer. The engine's current Illustrated Parts Catalog (IPC) for the specific engine serial number is the final authority for confirming part number eligibility.

Applications

• Primary Application: Regulation of control air pressure for the actuation of the engine's Pressurizing and Drain Valve (P&D Valve).

• May be used in other fluid or pneumatic control applications within the engine system where solenoid-operated regulation is required.

Why Choose 10752A-3?

The 10752A-3 regulator is a critical component within the turbine engine's intricate fuel control system. Its correct operation ensures proper fuel manifold pressurization during start and prevents damaging fuel leaks after shutdown. Choosing the genuine OEM Woodward part is the only way to guarantee the precise actuation characteristics, flow rates, and material compatibility required by the engine manufacturer. Using a non-certified or improperly repaired component introduces an unacceptable risk of engine start failures, hung starts, hot starts, or post-shutdown fires, potentially leading to catastrophic engine damage.

The operation of the 10752A-3 valve is centered on the precise interplay between electromagnetic force and fluid mechanics. When the solenoid coil is energized (or de-energized, depending on design logic), the resulting magnetic field retracts or extends a ferromagnetic plunger. This linear motion acts upon one end of a pivoting rocker arm. The rocker arm acts as a Class 1 lever, translating the solenoid's motion into a modulated force applied to the center of a flexible diaphragm. This diaphragm, often constructed from fuel-resistant elastomers or thin metal, forms a seal against a precisely machined valve seat or controls the opening of an orifice. By varying the force on the diaphragm, the solenoid controls the flow rate or pressure drop across the valve, thereby regulating the downstream control signal (e.g., P3 air pressure) sent to the Pressurizing and Drain Valve. This system allows a low-power electrical signal to precisely control a higher-power fluid or pneumatic function within the engine.

Note: This is a flight-critical engine component. Installation, adjustment, and testing must be performed by a certified A&P mechanic, typically with specialized training on the specific turbine engine model, in strict accordance with the engine manufacturer's maintenance manual. Incorrect installation or adjustment can lead to severe engine operational issues or damage.

Documentation

All technical data, installation procedures, and troubleshooting information for this component are proprietary to Woodward, Inc. and the respective engine manufacturer (e.g., Honeywell). This information is contained within the official Engine Maintenance Manuals (EMM) and Component Maintenance Manuals (CMM). No public-facing OEM documentation was located.