Editorial Technical Reference

Delivery Valve

This page explains how Delivery Valve is classified within Motor Vehicle Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A precision valve component within a fuel injection pump that controls the release of pressurized fuel to the injectors.

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Product Specifications

Technical details and manufacturing context for Delivery Valve

Definition
The delivery valve is a critical component of a diesel fuel injection pump, located between the high-pressure pump chamber and the fuel injection line. Its primary function is to precisely control the timing and quantity of fuel delivered to the injectors, prevent fuel backflow from the injection line into the pump chamber, and ensure a sharp cut-off of fuel delivery to eliminate post-injection dripping. The valve operates on a spring-loaded plunger principle. During the pump's delivery stroke, fuel pressure overcomes the spring force, lifting the valve off its seat and allowing fuel to flow into the injection line. At the end of the stroke, the spring forces the valve to close rapidly, creating a pressure drop in the line that ensures a clean injection cut-off and prevents secondary injections. This component is typically manufactured from alloy steel or stainless steel, with a case-hardened grade such as 20CrMo (per GB/T 3077) for surface hardness. Key parameters include operating pressure (1.0–1.6 MPa), cracking pressure (0.15–0.35 MPa), flow rate (2.5–6.0 L/min at rated pressure and 30°C fuel), leakage rate (≤0.5 mL/min at 0.8 MPa differential pressure), stroke (2.0–3.5 mm), seat diameter (6–10 mm), valve lift (0.8–1.5 mm), spring force (15–40 N at installed length), temperature range (-40–85°C), surface hardness (58–62 HRC after heat treatment), and weight (0.05–0.15 kg). These values are directory reference ranges and must be confirmed for the specific model and application. The delivery valve is a component used in motor vehicle manufacturing, specifically in diesel engine fuel systems. It is not a standalone product but part of a larger assembly. For procurement, verify the exact specifications, material grades, and standards with the legal manufacturer or supplier. The listed standard is a reference for pressure testing, not a certification of compliance. Always confirm the valve's compatibility with the fuel injection pump and engine requirements.
Working Principle
The delivery valve operates on a spring-loaded plunger principle. During the pump's delivery stroke, fuel pressure overcomes the spring force, lifting the valve off its seat and allowing fuel to flow into the injection line. At the end of the stroke, the spring forces the valve to close rapidly, creating a pressure drop in the line that ensures a clean injection cut-off and prevents secondary injections. The valve's cracking pressure (0.15–0.35 MPa) determines when it opens, and the spring force (15–40 N) controls the closing action. The valve lift (0.8–1.5 mm) and seat diameter (6–10 mm) define the flow area, affecting fuel delivery volume. The valve must maintain low leakage (≤0.5 mL/min) to prevent fuel dribble. Temperature range (-40–85°C) and surface hardness (58–62 HRC) ensure durability in diesel environments.
Common Materials
Alloy Steel, Stainless Steel
Technical Parameters
ParameterTypical rangeNotes & selection driver
Cracking Pressure0.15–0.35 MPaPressure at which valve lifts off seat
Flow Rate2.5–6.0 L/minAt rated pressure and 30°C fuel
Leakage Rate≤0.5 mL/minAt 0.8 MPa differential pressure
Stroke2.0–3.5 mmAffects fuel delivery volume
Seat Diameter6–10 mmDetermines flow area
Valve Lift0.8–1.5 mmMaximum lift at full flow
Spring Force15–40 NAt installed length
Temperature Range-40–85 °CContinuous operation
Material20CrMoCase-hardened steelGB/T 3077
Surface Hardness58–62 HRCAfter heat treatment
Weight0.05–0.15 kgTypical for assembly

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

Components / BOM
  • Valve Plunger Part
    Moves to open and close the fuel passage
    Material: Hardened Alloy Steel
  • Valve Seat Part
    Provides sealing surface for the plunger
    Material: Stainless Steel
  • Return Spring Part
    Forces the plunger back to closed position
    Material: Spring Steel
  • Valve Body/Housing Part
    Contains and aligns all internal components
    Material: Steel Alloy

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Delivery Valve.

Fuel Delivery Valve Injection Valve

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Fuel Injection Pump
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 2000 bar
flow rate: 0.5 to 10 L/min
temperature: -40°C to +150°C
slurry concentration: Not applicable (clean fuel only)
Media Compatibility
✓ Diesel fuel ✓ Biodiesel blends (B20 max) ✓ Kerosene-based fuels
Unsuitable: High-water-content fuels or corrosive chemicals
Sizing Data Required
  • Required fuel flow rate (L/min)
  • System operating pressure (bar)
  • Injector nozzle specification/type

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Cavitation damage
Cause: Pressure drop below fluid vapor pressure causing vapor bubble formation and implosion, leading to pitting and material loss on valve surfaces
Seat wear and leakage
Cause: Abrasive particles in fluid stream, improper seating alignment, or excessive cycling leading to degradation of sealing surfaces
Maintenance Indicators
  • Unusual high-frequency vibration or audible knocking sounds during operation
  • Visible external leakage at valve body connections or abnormal pressure fluctuations downstream
Engineering Tips
  • Implement proper upstream filtration and maintain fluid cleanliness to prevent abrasive wear and particle contamination
  • Ensure correct installation alignment and follow manufacturer's torque specifications for all connections to prevent stress-induced failures

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 5208: Industrial valves - Pressure testing of valves ANSI/ASME B16.34: Valves - Flanged, Threaded, and Welding End DIN EN 12266-1: Industrial valves - Testing of metallic valves

Quoted from the published standard.

Manufacturing Precision
  • Bore diameter: +/-0.05mm
  • Seat flatness: 0.08mm maximum deviation
Quality Inspection
  • Hydrostatic pressure test
  • Leakage test with helium mass spectrometry

Manufacturers of Delivery Valve

Manufacturer profiles associated with Delivery Valve.

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Frequently Asked Questions

What is the function of a delivery valve?

The delivery valve controls the release of pressurized fuel from the high-pressure pump chamber to the injection line. It prevents fuel backflow and ensures a sharp cut-off of fuel delivery to avoid post-injection dripping.

What materials are used for delivery valves?

Common materials include alloy steel and stainless steel. A case-hardened grade like 20CrMo (per GB/T 3077) is used for surface hardness, achieving 58–62 HRC after heat treatment.

What are the key parameters to verify for a delivery valve?

Key parameters include operating pressure (1.0–1.6 MPa), cracking pressure (0.15–0.35 MPa), flow rate (2.5–6.0 L/min), leakage rate (≤0.5 mL/min), stroke (2.0–3.5 mm), seat diameter (6–10 mm), valve lift (0.8–1.5 mm), spring force (15–40 N), temperature range (-40–85°C), and weight (0.05–0.15 kg). Always confirm these with the manufacturer for your specific application.

How does the delivery valve prevent secondary injections?

At the end of the delivery stroke, the spring forces the valve to close rapidly, creating a pressure drop in the injection line. This pressure drop ensures a clean cut-off of fuel delivery, preventing secondary injections and post-injection dripping.
Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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