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Linch Machinery Co. Ltd.
Linch Machinery Co. Ltd. --- Global supplier of sanitary stainless steel valves and fittings
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Linch Machinery Co. Ltd. Quality Info

Quality Control

Production and Quality Control

1. The raw material we use:

Sealing Material Stainless Steel Stick (304 / 316L)

Forged Parts Casting Parts Stainless Steel Tube

2. How we control material quality?

The following tests are 100% conducted on-site:

Visually check appearance and surface quality PMI test to verify metal element ratio

3. Forming Machine Process

CNC Lathe Processing Milling Machine Processing Punching Press Drilling

Punching Press Drilling Cold Forming Molding Welding Assembly

4. How do we control the quality of machining

CNG Lathes from Advanced Milling Machines UT Inspection

YAMAZAKI MAZAK to ensure welding quality

Weld Polishing 100% Appearance & Size Inspection Size & Appearance Shaping

online (thickness, roundness, etc.)

5. Surface Treatment

We offer the following processes to choose:

Mechanical Polishing (MP) Acid Cleaning for Anti-corrosion

to improve brightness (gloss, matte)

Electrolysis Polish (EP) Custom Process: Bright Annealing treatment

to improve surface smoothness eliminate strees to improve toughness

6. How do we ensure surface quality

Visual Inspection Roughness Detection

7. Assembly and marking

Assembly Marking

8. How do we ensure finished product quality (FQC inspection)

Visual Inspection Material Grade Measurement Dimension Inspection

Roughness Detection Roughness Detection Leakage Test

9. Cleaning and packing

Ultrasonic Cleaning Sink Packing Packing

Company Profile

Linch Machinery Co. Ltd.

Contact Person: MissSarah Ding

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