Editorial Technical Reference

Manifold (Distribution Header)

This page explains how Manifold (Distribution Header) is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A distribution component that splits a single fluid input into multiple outputs for spray nozzles.

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Manifold (Distribution Header) in a manufacturing environment
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Product Specifications

Technical details and manufacturing context for Manifold (Distribution Header)

Definition
The manifold (distribution header) is a central component in industrial spray systems, serving as the distribution point that receives fluid from a single source and directs it to multiple spray nozzles or outlets. Its primary function is to ensure consistent pressure and flow across all connected nozzles, enabling uniform application in processes such as coating, cooling, or cleaning. Constructed from stainless steel (SS304 or SS316), the manifold is designed to withstand demanding industrial environments. Key specifications include a number of outlets ranging from 4 to 12 ports, with custom counts available to match specific coverage requirements. Inlet connection sizes range from 1 to 4 inches, and outlet connection sizes from 1/4 to 1 inch, both conforming to ISO 228-1 for thread compatibility. The operating pressure range is 1.0 to 1.6 MPa, with a maximum pressure of 2.5 MPa; exceeding the maximum could cause permanent deformation. Operating temperature ranges from -40°C to 85°C, limited by seal material. Flow capacity is 10 to 100 L/min, depending on pressure drop and outlet size. Surface finish is Ra 0.8 to 1.6 µm, with smoother finishes available for hygienic applications. Weight varies from 2 to 15 kg. Leakage rate is 0.01 mL/min at rated pressure with water. Material grades conform to ASTM A276. These values are reference ranges; verify model-specific data with the manufacturer or supplier before selection.
Working Principle
Fluid enters the manifold through a single inlet port and is distributed through internal channels to multiple outlet ports. The internal design minimizes pressure drop and maintains flow consistency across all outlets, enabling simultaneous operation of multiple spray nozzles from a single supply line. The manifold acts as a hydraulic junction, balancing flow and pressure to each nozzle, which is critical for uniform spray coverage. Proper sizing of the manifold, including inlet and outlet connections, ensures that the system operates within the specified pressure and flow limits.
Common Materials
Stainless Steel
Technical Parameters
ParameterTypical rangeNotes & selection driver
Number of Outlets4–12 portsDetermines coverage area; custom counts available.
Inlet Connection Size1–4 inchMatches upstream piping.ISO 228-1
Outlet Connection Size1/4–1 inchCompatible with standard nozzles.ISO 228-1
Maximum Pressure2.5 MPaExceeding may cause permanent deformation.
Operating Temperature-40–85 °CSeal material limits range.
Flow Capacity10–100 L/minDepends on pressure drop and outlet size.
Material GradeSS304/SS316SS316 for corrosive media.ASTM A276
Surface FinishRa 0.8–1.6 µmSmoother for hygienic applications.ISO 1302
Weight2–15 kgVaries with size and material.
Leakage Rate0.01 mL/minAt rated pressure with water.

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
  • Inlet Port Part
    Receives fluid from the main supply line
    Material: Stainless Steel
  • Distribution Chamber
    Internal volume where fluid is divided for distribution
    Material: Stainless Steel
  • Outlet Ports Part
    Connections for attaching spray nozzles or distribution lines
    Material: Stainless Steel
  • Mounting Brackets Part
    Secures the manifold to the system structure
    Material: Steel

Application & selection

Application Fit & Sizing Matrix

Operational Limits
pressure: Max 10 bar (150 psi)
flow rate: Up to 500 L/min per outlet
temperature: -20°C to 150°C
slurry concentration: Max 15% solids by weight
Media Compatibility
✓ Water-based coolants ✓ Industrial cleaning solutions ✓ Agricultural chemicals
Unsuitable: Hydrochloric acid (HCl) due to corrosion risk
Sizing Data Required
  • Total system flow rate (L/min)
  • Number of spray nozzles required
  • Required pressure drop across manifold

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Crevice corrosion
Cause: Stagnant fluid accumulation in low-flow areas or under gaskets, leading to localized electrochemical attack and material degradation, often exacerbated by chloride presence or oxygen concentration cells.
Thermal fatigue cracking
Cause: Cyclic thermal stresses from repeated heating and cooling cycles, causing progressive crack initiation and propagation at stress concentration points like weld joints or sharp corners, especially in manifolds handling hot fluids.
Maintenance Indicators
  • Visible weeping or small leaks at flange connections or weld seams, indicating gasket failure, corrosion penetration, or crack development.
  • Abnormal pressure fluctuations or flow imbalances across distribution branches, suggesting internal blockage, erosion, or partial failure affecting flow distribution.
Engineering Tips
  • Implement regular ultrasonic thickness testing at high-risk corrosion areas and thermal stress zones to monitor wall thinning and detect early crack formation before failure occurs.
  • Optimize manifold design with smooth internal transitions, adequate drainage slopes, and strategic placement of vents and drains to minimize stagnant zones and reduce erosion-corrosion and thermal stress concentrations.

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
ASME B31.3 (Process Piping) EN 1092-1 (Flanges and their joints)

Quoted from the published standard.

Manufacturing Precision
  • Bore diameter: +/- 0.05 mm
  • Flatness of mounting surfaces: 0.1 mm per 300 mm
Quality Inspection
  • Hydrostatic Pressure Test (per ASME B31.3)
  • Dimensional Verification (CMM or manual measurement)
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Manufacturers of Manifold (Distribution Header)

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Frequently Asked Questions

What is the purpose of a manifold in a spray system?

The manifold distributes fluid from a single source to multiple spray nozzles, ensuring consistent pressure and flow for uniform application.

What materials are available for this manifold?

The manifold is available in stainless steel grades SS304 and SS316, with SS316 recommended for corrosive media.

What is the operating pressure range?

The operating pressure range is 1.0 to 1.6 MPa, with a maximum pressure of 2.5 MPa.

How do I verify the manifold's specifications?

Always confirm model-specific values, such as outlet count, connection sizes, and pressure ratings, with the legal manufacturer or supplier before installation.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Related equipment

Applied To / Applications

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

Spray System (Nozzles & Manifold)
View system integration details

Industrial Ecosystem & Supply Chain Structure

Data Basis

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

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 12 October 2026

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