Editorial Technical Reference

Fluid Cap / Body

This page explains how Fluid Cap / Body 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

The main housing component of a spray nozzle assembly that contains and directs fluid flow.

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Fluid Cap / Body in a manufacturing environment
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Product Specifications

Technical details and manufacturing context for Fluid Cap / Body

Definition
The Fluid Cap/Body is the primary structural component of a spray nozzle assembly, serving as the housing that encloses internal parts, maintains pressure integrity, and provides the fluid passageway from the inlet to the orifice. It determines the nozzle's connection type, mounting configuration, and overall durability. This component is typically manufactured from materials such as Stainless Steel 316, Brass, or PVC, selected based on the application's chemical compatibility, pressure, and temperature requirements. The body's design includes an inlet connection, typically threaded per ISO 7-1 with sizes ranging from 1/4 to 1 inch, and an internal chamber that directs fluid toward the orifice plate or spray tip. The operating pressure range is 1.0–1.6 MPa, with a pressure rating of PN16–PN40 per ISO 7268, and the flow rate varies from 5 to 50 L/min depending on nozzle size and pressure. The temperature range is -40 to 85°C, limited by seal material, which can be NBR or FKM per ASTM D2000. Critical dimensions are held to a tolerance of ±0.05 mm per ISO 2768-m, and surface finish on sealing surfaces is Ra 0.8–1.6 µm per ISO 1302. Thread tolerances are 6g–6H per ISO 965-1. The overall length ranges from 50 to 150 mm, and weight from 0.5 to 2.5 kg. Material grades for stainless steel are typically SS304–SS316 per ASTM A276, with 316 recommended for corrosive media. These values are reference ranges; actual specifications must be confirmed with the manufacturer for the specific model and application. The Fluid Cap/Body is essential for ensuring proper spray performance, pressure containment, and system reliability.
Working Principle
Fluid enters the body through an inlet connection, flows through an internal chamber where pressure is maintained, and is directed toward the orifice plate or spray tip. The body's geometry controls flow characteristics and provides structural support for all internal components. The internal chamber is designed to minimize pressure drop and ensure uniform flow distribution. The body's material and wall thickness must withstand the operating pressure and temperature. The inlet connection size and thread type determine compatibility with the piping system. The body also provides mounting points for the nozzle assembly, ensuring proper alignment and sealing. The surface finish of internal passages affects flow resistance and wear resistance. The body's design must accommodate the seal material and maintain a leak-tight joint under varying thermal and pressure conditions. Proper installation and torque are critical to avoid over-stressing the body or damaging threads. Regular inspection for corrosion, erosion, or cracking is necessary to maintain performance and safety.
Common Materials
Stainless Steel 316, Brass, PVC
Technical Parameters
ParameterTypical rangeNotes & selection driver
Flow Rate5–50 L/minDepends on nozzle size and pressure
Inlet Connection Size1/4–1 inchThread type per ISO 7-1ISO 7-1
Material GradeSS304–SS316316 for corrosive mediaASTM A276
Temperature Range-40–85 °CSeal material limits
Weight0.5–2.5 kgDepends on size and material
Surface FinishRa 0.8–1.6 µmCritical for sealing surfacesISO 1302
Tolerance on Critical Dimensions±0.05 mmEnsures proper fit and sealingISO 2768-m
Thread Tolerance6g–6HFor external and internal threadsISO 965-1
Pressure RatingPN16–PN40Max allowable working pressureISO 7268
Seal MaterialNBR–FKMFKM for high temp and chemical resistanceASTM D2000
Overall Length50–150 mmVaries with connection size

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 Thread Part
    Provides connection to fluid supply line
    Material: Same as body material
  • Internal Chamber Part
    Holds fluid under pressure before discharge
    Material: Same as body material
  • Mounting Flange Part
    Secures nozzle to equipment or piping
    Material: Same as body material
  • Orifice Seat Part
    Precise surface where orifice plate or tip seals
    Material: Same as body material

Application & selection

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 100 bar (1450 psi)
flow rate: 0.5 to 500 L/min
temperature: -40°C to 150°C
slurry concentration: Up to 30% solids by weight
Media Compatibility
✓ Water-based fluids ✓ Chemical solutions (pH 3-10) ✓ Oil-based lubricants
Unsuitable: Hydrofluoric acid or highly corrosive halogenated compounds
Sizing Data Required
  • Required flow rate (L/min)
  • Operating pressure (bar)
  • Fluid viscosity (cP)

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Seal degradation and leakage
Cause: Chemical incompatibility with process fluid leading to seal swelling, hardening, or cracking; excessive temperature beyond seal material limits; improper installation causing seal damage
Thread wear and galling
Cause: Improper torque application during installation (over-tightening or under-tightening); misalignment during assembly; lack of lubrication on threads; material incompatibility between cap and body threads
Maintenance Indicators
  • Visible fluid seepage or drips around the cap-body interface during operation
  • Audible hissing or whistling sound indicating pressure leakage past the seal
Engineering Tips
  • Implement proper torque procedures using calibrated tools and follow manufacturer specifications to prevent thread damage and ensure optimal seal compression
  • Establish regular inspection intervals to check seal condition and replace proactively based on service hours or cycles rather than waiting for failure

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 1179-1:2013 (Connections for general use and fluid power - Ports and stud ends) ANSI/ASME B16.5:2020 (Pipe Flanges and Flanged Fittings) DIN 2353:2017 (Tube fittings with cutting ring for general and hydraulic use)

Quoted from the published standard.

Manufacturing Precision
  • Bore diameter: +/-0.02mm
  • Sealing surface flatness: 0.1mm
Quality Inspection
  • Pressure test (hydrostatic/pneumatic) for leak integrity
  • Dimensional verification with coordinate measuring machine (CMM)
Technical documentation
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Manufacturing capability
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Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
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Manufacturers of Fluid Cap / Body

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Frequently Asked Questions

What materials are available for the Fluid Cap/Body?

The Fluid Cap/Body is available in Stainless Steel 316, Brass, and PVC. The choice depends on the application's chemical compatibility, pressure, and temperature requirements. For corrosive media, Stainless Steel 316 is recommended. Always confirm the material grade with the manufacturer for your specific application.

What is the operating pressure range for this component?

The reference operating pressure range is 1.0–1.6 MPa, with a pressure rating of PN16–PN40 per ISO 7268. However, the actual allowable pressure depends on the specific model, material, and temperature. Verify the maximum allowable working pressure with the manufacturer.

What standards apply to the Fluid Cap/Body?

Relevant standards include ISO 7-1 for thread types, ISO 1302 for surface finish, ISO 2768-m for tolerances, ISO 965-1 for thread tolerances, ISO 7268 for pressure ratings, ASTM A276 for material grades, and ASTM D2000 for seal materials. These standards serve as verification references; compliance must be confirmed with the supplier.

How do I select the correct Fluid Cap/Body for my nozzle?

Selection requires considering the fluid type, operating pressure and temperature, flow rate, inlet connection size, and material compatibility. The reference parameters provide a starting point, but you must consult the manufacturer's datasheet or engineering support to ensure the component meets your system's requirements.

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 Nozzle Assembly
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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