Aviation Sensor Single Valve QXF-4

Aviation Sensor Single Valve QXF-4 – Integrated Sensing & Flow Control for Smart Aircraft Systems

The Aviation Sensor Single Valve QXF-4 is a next-generation compact valve with built-in sensor technology, designed for aircraft pneumatic, hydraulic, and fuel systems where real-time status feedback is critical. Unlike conventional shutoff valves, the QXF-4 integrates a precision position sensor (or optional pressure/flow sensor) that outputs electrical signals to the cockpit or engine control unit. This aviation sensor operator friendly device reduces wiring, eliminates external sensor mounting, and improves system reliability. As part of our intelligent valve family – which also includes the Aviation Valve T-5T and cold air solenoid valve QDF-42A – the QXF-4 delivers high precision, low power consumption (0.3~0.43W coil), and a leak-tight design rated for harsh aviation environments.

Technical Specifications

The QXF-4 aviation single valve is engineered to meet rigorous aerospace performance requirements. Key parameters include:

• Valve Type: 2-way, normally closed (optional normally open) solenoid-operated single valve with integral sensor
• Nominal Diameter: 4 mm (QXF-4 series)
• Max Operating Pressure: 21 MPa (210 bar / 3045 psi) for hydraulic; 1.0 MPa for pneumatic
• Proof Pressure: 31.5 MPa (hydraulic)
• Fluid Compatibility: Aviation hydraulic fluids (MIL-PRF-83282, Skydrol), air, nitrogen, fuel (Jet A, JP-8)
• Temperature Range: -55°C to +135°C (ambient); media temperature -40°C to +120°C
• Coil Power Consumption: 0.3 ~ 0.43 W (28V d.c. standard)
• Contact Load & Electrical Life (sensor output): Resistive 1A @28V d.c., 1×10⁵ operations; low-level (10~50)μA, (10~50)mV, 1×10⁵ cycles
• Contact Resistance (sensor): Initial ≤50 mΩ; after life test ≤200 mΩ
• Action Time (valve + sensor response): ≤4 ms (opening), ≤4 ms (closing); high-speed option ≤3 ms
• Dielectric Withstanding Voltage: Normal atmosphere: 500 Vr.m.s. @ 50 Hz; reduced pressure: 250 Vr.m.s. @ 50 Hz
• Insulation Resistance: Normal >500 MΩ; after high-level life test >50 MΩ
• Weight: <3 g (valve body plus sensor – ultra-compact)
• External Sealing (Leakage Rate): ≤1×10⁻³ Pa·cm³/s (helium mass spectrometer tested)
• Internal Leakage (valve seat): ≤0.5 mL/min at rated pressure
• Incentive Pulse Width (for coil): (10~50) ms
• Line Coil Voltage Options: 5V, 12V, 24V, 28V d.c. at 25°C

The integrated sensor provides a SPDT contact output that changes state when the valve reaches fully open or closed position, eliminating the need for external aircraft airspeed sensor or proximity sensor interfaces.

Product Images & Visuals

The high-resolution image shows the QXF-4’s compact stainless steel body, integral electrical connector (MS3112-type), and threaded port (¼”-18 NPT or MS33656). Additional cutaway drawings and wiring schematics are available on request.

Key Features & Advantages

Compared to traditional discrete valve + external sensor assemblies, the QXF-4 offers a paradigm shift in aircraft fluid control:

• Integrated sensor feedback: Eliminates separate sensor mounting, bracket, and wiring harness – reduces weight and failure points. The sensor output is fully sealed and immune to aviation aviation co sensor cross-interference.
• Ultra-low power consumption (0.3W typical): Minimizes heat generation in avionics bays and allows direct drive from logic-level outputs (e.g., 28V d.c. aircraft bus).
• Fast response (≤4ms): Enables precise timing for hydraulic actuation and emergency shutoff sequences.
• Hermetic sealing (≤1e-3 Pa·cm³/s): Prevents external leakage of hazardous fluids and withstands altitude pressure changes – critical for hydraulic pressure sensor and fuel pressure transducer integrity.
• Gold-plated contacts: The sensor switch provides reliable low-level signal switching (down to 10μA) for direct connection to flight control computers (FCC).
• Corrosion-resistant body: 17-4PH stainless steel with passivation, rated for 500-hour salt spray per ASTM B117.

How to integrate the QXF-4 into an aircraft system:
Step 1: Select port configuration (NPT, MS flareless, or SAE O-ring). Apply appropriate sealant.
Step 2: Mount the valve via the two M3 threaded holes (torque to 1.5 N·m).
Step 3: Connect the coil leads to a 28V d.c. switched supply (coil polarity independent).
Step 4: Wire the sensor output (common, NO, NC) to a discrete input or aoa sensor aviation conditioning module.
Step 5: Perform functional test: energize coil – valve opens within 4ms, sensor changes state; de-energize – valve closes and sensor returns.

By adopting the QXF-4, OEMs and MROs reduce part count, simplify BOM management, and improve diagnostics (sensor confirms actual valve position). Our manufacturing process also produces aviation temperature sensor ZWH-2 and oxygen value QF-21A, ensuring consistent quality across your fluid control and sensing needs.

Application Scenarios

The QXF-4 aviation sensor single valve is ideal for both civil and military aircraft subsystems where compactness and status feedback are paramount:

• Engine bleed air shutoff: Provides real-time confirmation to EEC (Electronic Engine Control) – often paired with air pressure meter digital monitors.
• Hydraulic system isolation: Used in landing gear alternate extension circuits; sensor output verifies valve position before gear actuation.
• Fuel cross-feed and transfer: Prevents single-point failure; sensor alarms cockpit crew in case of valve drift.
• Cabin pressure control (pneumatic): Integrates with pressure gauge ashcroft for outflow valve backup.
• Test benches and aerospace ground equipment: Provides remote position indication for automated test sequences.

For procurement specialists, the QXF-4 delivers clear value: reduced installation labor (no separate sensor mounting), higher system MTBF (fewer connectors), and lower spare parts inventory. The ability to read valve position directly from the cockpit reduces troubleshooting time by up to 70% compared to blind valves. Additionally, the sensor’s low-level switching capability (<50mV) allows direct integration with sensitive pressure transducer hydraulic monitoring circuits.

Certifications & Compliance

The QXF-4 is designed and qualified to meet leading aerospace industry standards:

• AS9100D certified production facility
• MIL-V-5528 (valve, hydraulic, general specification) and MIL-S-22885 (switch, sensitive, for sensor output)
• RTCA DO-160G – tested for temperature, altitude, vibration, shock, and fluid susceptibility (Section 11)
• ISO 9001:2015 with aerospace sector approval
• RoHS 3 (2015/863/EU) and REACH SVHC compliant (excluding non-removable seals)

Each QXF-4 is serialized and includes a Certificate of Conformance (CoC) with test data for coil resistance, insulation resistance, dielectric strength, and leakage rate. Third-party qualification reports (e.g., fire-resistant fluid compatibility) are available upon request.

Customization Options

To accommodate diverse airframe and system designs, the QXF-4 can be tailored in several ways:

• Port thread types: MS33656 flareless (standard), SAE J514 O-ring boss (ORB), ¼”-18 NPT, or AN flared (37°).
• Sensor type: SPDT mechanical switch (standard), solid-state (Hall effect) for non-contact sensing, or analog pressure transducer output (0.5-4.5V).
• Coil voltage: 5V, 12V, 24V, 28V d.c., or 115V 400Hz AC (on request).
• Electrical connector: MS3112 circular (standard), D-sub, or flying leads.
• Flow orifice modification: Cv values from 0.05 to 0.5 to match system flow requirements.
• Material upgrade: Inconel 718 for high-temperature (>200°C) or corrosive environments.

Our engineering team provides 2D outline drawings, 3D CAD models (STEP/IGES), and application notes. For large-scale programs, we can co-design a variant that integrates seamlessly with your industrial pressure transducer network or electronic pressure transducer monitoring system.

Production Process & Quality Assurance

Every QXF-4 aviation sensor single valve undergoes a rigorous 9-step manufacturing and test protocol:

1. Precision CNC machining of valve body and internals from stainless steel or aluminum forging (tolerance ±0.005 mm).
2. Ultrasonic cleaning and passivation – all fluid passages inspected with borescope.
3. Coil winding and encapsulation – 100% tested for resistance and dielectric strength.
4. Sensor assembly (gold-plated contacts or Hall effect) in Class 7 cleanroom.
5. Final assembly of poppet, spring, and seat – lubricated with aviation-grade grease.
6. Hydrostatic proof test at 1.5x rated pressure (31.5 MPa) – zero external leakage.
7. Electrical and functional test: Measures action time, contact resistance, coil current, and sensor switching threshold.
8. Helium leak test (mass spectrometer) – external leak rate ≤1×10⁻³ Pa·cm³/s.
9. 100% dimensional inspection with CMM and thread gauges; sample burn-in for 5000 cycles.

Our factory is IATF 16949 certified and applies statistical process control (SPC) to critical dimensions. This same quality culture extends to our aviation light sensor and accelerometer sensor aviation product lines, ensuring the QXF-4 meets the highest expectations for safety and reliability.