Jiangmen Yilin Precision Manufacturing Co., Ltd

Case Studies

Case Studies

Supporting the Transition to EU Drinking Water Requirements

Category: DWD · Material Compliance · Stainless Steel · Lead Reduction

SUS316L water-contact body with cast and machined passages
Water-Contact ComponentsSUS316L / EN 1.4404

The Starting Point

Challenge

The recast EU Drinking Water Directive—Directive (EU) 2020/2184—introduces harmonized hygiene requirements for materials and products that come into contact with drinking water.

Sanitary-product manufacturers must review not only the material grade, but also the complete water-contact system, including material composition, manufacturing residues, surface condition, joining processes, cleaning, traceability and final-product validation.

Customers therefore need manufacturing partners that can support material transition and provide the technical documentation required for product assessment.

Engineering & Manufacturing

YILIN Solution

YILIN supports customers in developing and manufacturing drinking-water-contact components through a structured engineering and quality approach.

01 — Water-Contact Component Review

We identify every component and surface that may come into direct or indirect contact with drinking water.

The review covers:

  • Main water-contact bodies
  • Internal machined components
  • Tubes, connectors, nuts and valve components
  • Welded or assembled water passages
  • Seals, lubricants and other process-related substances
  • Surface treatments applied to water-contact areas
Precision CNC machining of an internal waterway component
Component ReviewInternal waterway CNC machining

02 — Material Route Evaluation

Depending on the product design, application and customer specification, YILIN can evaluate suitable material routes, including:

  • SUS316L / EN 1.4404 for main water-contact components
  • SUS304, SUS316 or SUS316L for internal machined parts
  • Customer-approved low-lead or lead-free copper-alloy alternatives
  • Materials selected with reference to applicable European positive lists and customer requirements
SUS304, SUS316L and lead-free brass component material samples
Material RoutesMaterial samples

DWD Support

A Structured Engineering Approach

  1. 01

    Identify

    Identify all water-contact components and surfaces

  2. 02

    Select

    Evaluate materials against customer and applicable EU requirements

  3. 03

    Optimize

    Review casting, forging, machining, welding and finishing processes

  4. 04

    Control

    Control chemicals, residues, burrs, cleanliness and cross-contamination

  5. 05

    Validate

    Support material, migration, corrosion and product testing

  6. 06

    Document

    Provide production records and batch traceability

03 — DFM and Process Optimization

YILIN reviews the complete manufacturing route to reduce potential hygiene and production risks:

  • Investment casting or forging
  • Precision CNC machining
  • Cold forming and stamping
  • TIG / argon welding
  • Passivation
  • Surface finishing
  • Assembly and cleaning
Stainless steel components being loaded into an annealing furnace
Manufacturing ProcessStainless steel annealing
Close view of welding a metal component
Joining ProcessWelding

04 — Clean Manufacturing Control

Process controls can be established according to the product and customer requirements:

  • Segregated material identification
  • Controlled cutting fluids and process chemicals
  • Burr and foreign-material control
  • Cleaning and rinsing procedures
  • Passivation where required
  • Protection against cross-contamination
  • Clean packaging after final inspection
Gloved handling of a component with a brushed surface finish
Surface ConditionBrushed surface finishing

From Review to Production

Result

YILIN technician using an X-ray fluorescence spectrometer for material testing
Material AssessmentSpectrometer testing
  • A clear material and process route for drinking-water-contact components
  • Reduced risk from unsuitable materials and manufacturing residues
  • Better traceability from raw material to finished product
  • Documentation prepared to support customer assessment
  • A scalable production route from prototype and validation to mass production
  • Support for customers transitioning toward the harmonized EU requirements

Start Your Project

Designed for Safer
Water-Contact Applications

From material selection to clean manufacturing and validation support, YILIN helps customers prepare sanitary components for evolving European drinking-water requirements.

Discuss Your DWD Project Request a Material Review
Capability Tags:

DWD Support / SUS316L / Lead Reduction / Clean Manufacturing / Traceability

Compliance Statement

YILIN provides material selection, manufacturing, documentation and third-party testing support based on customer specifications. Final product compliance and market approval are subject to the applicable EU requirements, intended application, test results and assessment by the customer or authorized conformity-assessment body.