Define Valves of SYI: 

1.       Material: 

Cast ductile iron: QT400-18, QT450-12, QT500-7, QT600-3 and QT700-2;
Grey iron: HT150, HT200, HT250, HT300;
Other Materials: Steel and Stainless Steel;

2.       Process:

Sand casting, Investment casting, Lost foam casting;

3.       Application:

Municipal industry;

4.       OEM design/service:

Our company can supply various pulleys (OEM) according to the customers’ drawings and requirements. Please offer us your enquiry with detailed drawings, specifications, unit weight, quality requirements and pictures. We will supply you not only the products with good quality but also competitive price.

Production  Equipments and Processes

Define Valves  

Machining Shop

With our powerful precision CNC machining equipments such as lathes, milling machines and drilling press, we can easily operate Turning, Drilling and Milling. Furthermore, we are able to run other operations like cutting, grinding, bending, shaping, planning and sawing. 

  Define Valves

SYI Quality Control 

Overall product quality inspections is from raw materials incoming inspection, semi-finished products inspection, specimen testing, and products testing. We strictly follow the procedures of ISO 9001, IQC, IPQC & FQC. SYI has independent inspectors and QC engineers to check & record in accordance with the procedure and submited for approval/audit.

  Define Valves

SYI Design

SYI Group has 26 years of independent development and design ability. We have 30 senior engineers, who is skilled atAUTO CAD, PRO ENGINEER, SOLID WORKS and other 2D & 3D softwares. We are able to design, develop, produce and deliver your PO according to your drawings, samples or just an idea. Dual control of standard products and OEM products.

Define Valves  

We Are Certified and our market !

SYI Group achieves the certificate of ISO 9001:2008 for the Quality Management System from TUV Rheinland. Meanwhile, SYI Group holds the Kitemark License/BSI/SGS/BV/NF/CE/WRAS/UL/FM certificates for different products.

Define Valves

More certification ... (Contact us!)

5. Contact SYI Group :

SYI Industrial Co., Ltd.

1. Email: duwei#  ( # = @ )

2. Tel: 0086 351 4192139

3. Fax: 0086 351 4040962

4. Website:   

You will get our quick reply!

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Best regards

SYI Group