Exhaust Valve: Diameter 30-50 mm, Stem Diameter 6-10 mm

Component Specifications

Definition

The exhaust valve is a critical component in internal combustion engines, responsible for opening and closing the exhaust port in the cylinder head to allow spent combustion gases to exit the combustion chamber. It operates under extreme thermal and mechanical stress, typically made from heat-resistant alloys to withstand temperatures exceeding 800°C. The valve's precise timing and sealing directly impact engine efficiency, emissions, and performance.

Working Principle

The exhaust valve opens during the exhaust stroke of the engine cycle, allowing high-pressure exhaust gases to escape from the combustion chamber into the exhaust manifold. It closes during the intake, compression, and power strokes to maintain compression and prevent backflow. Valve operation is controlled by the camshaft via rocker arms or direct actuation, with precise timing managed by the engine control unit.

Materials

Heat-resistant alloys (typically 21-4N steel, Inconel, or titanium), with stellite-faced seats for wear resistance. Valve stems are often chrome-plated for reduced friction.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Diameter	30-50 mm
Seat Angle	45° standard
Lift Height	8-15 mm
Stem Diameter	6-10 mm
Pressure Rating	Up to 150 bar
Operating Temperature	600-900°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

DIN 3760, SAE J775

Engineering Analysis

Risks & Mitigation

Valve burning from overheating
Valve seat recession
Stem galling and seizure
Fatigue cracking under cyclic loading

FMEA Triads

Trigger: Insufficient valve cooling
Failure: Valve overheating and distortion
Mitigation: Implement improved cooling channel design, use sodium-filled valves for high-temperature applications

Trigger: Carbon deposit accumulation
Failure: Poor valve sealing and compression loss
Mitigation: Regular maintenance cleaning, use of fuel additives, proper air-fuel mixture control

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.01 mm for stem diameter, ±0.5° for seat angle

Test Method

Dimensional inspection per ISO 1101, pressure testing at 1.5x operating pressure, metallurgical analysis for material compliance

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Exhaust Valve

12 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Donjoy Technology

Wenzhou, Zhejiang, CN

Also makes: Sanitary Fittings, Butterfly Valve, Poppet/Valve and 9 more