JUNTAI Flow Control have stringent Quality Management and Control System backed by qualification of ISO 9001:2015, PED (Pressure Equipment Directive), API 6D, API 607, API 6FA, SIL (Functional Safety Certificate), and our strong commitment to Environmental Management System, and Occupational Health and Safety Management Systems (OHSMS) is accredited with 14001:2015 and ISO 45001:2018 certification.

Finite Element Analysis

JUNTAI Valves are manufactured as per international standards such as API, ANSI, ASME, ASTM, MSS, and NACE. Our engineering team consistently monitors updates to these standards and incorporates any applicable changes that affect the design, regulations, and performance of our valves. Each step of valve engineering and manufacturing can be validated using advanced software starting from the 3D model to finite element analysis of loads, tension and deformations, and final stress test.

3D Model Design

All the tests are done internally in the dedicated testing area, by means of multiple and specifically designed (and certified) test benches that are used to control the output of the production line.

Typical Valve Design

JUNTAI Flow Control guarantees the performance and reliability of its products through the 100% systematic testing & Inspection carried out as per the Inspection / Test Plan, Required Specifications, and Applicable Manufacturing / Quality Standards.

Quality is one of the Core Value of the Company and it complied with but is not limited to the following as a minimum:

  • Design Review
  • Continuous Research for new materials either for construction and for sealing Material Properties Control (mechanical and chemical)
  • Materials Quality (Volumetric Tests, Magnetic Test, Penetrate Test, PMI)
  • Traceability of the materials and parts
  • Inspection During Production Process in all its phases Performances of the Valves
  • Accuracy in the final stage before shipment
  • Issuing of complete documentation file in full compliance with project requirement Respect to the Contractual Delivery


Raw material quality is vital for valve quality, JUNTAIValve source casting, and forging from the selected vendors.

Before machining, we always take 4 steps to guarantee the raw material quality:

  1. Visual Test: Visual test as per MSS SP55
  2. Valve wall thickness test: Random inspection of valve wall thickness by ultrasonic thickness meter
  3. Chemical Component analysis: Random PMI test is performed to ensure qualification.
  4. Dimension Check face to face; flange thickness will be checked before the process.


When the designs are approved by the customer, the production process starts. Our highly qualified staff works with high-speed machines to produce valves accordingly as per requirement. After rough machining, 20% of valve component is checked dimensionally by Q.C inspectors and 100% after fine machining.


After the production process is finished 100% of valves are tested in-house. Our valves have to ensure a hydro-test on the body and seat, followed by a low pressure air-test in excess of API 6D, API 598 requirements, prior to shipping. Additional tests on valves and materials can also be arranged by JUNTAIValves.

The following standard performance test are performed according to API 6D, API 598, or to customer specific requirements:

  • Visual & Dimensional Check
  • Hydrostatic Testing
  • Low Pressure Gas Seat Testing
  • High Pressure Gas Testing
  • Cryogenic Gas Testing Down To -196 “ (-320,8 a F)
  • High Temperature Testing Up To 660″ (1220 a F)
  • Fugitive Emission Gas Testing
  • Antistatic Testing
  • Torque Testing
  • Cavity Relief Testing
  • Double Block & Bleed (DBB) Testing
  • Double Isolation & Bleed (DIB-1, DIB-2) Testing


After the Valve testing is completed, the most important process is the painting. The standard painting is performed as per JUNTAIStandard Painting Procedures. If customers require any special painting, we can follow the same.


We follow the safe and JUNTAIstandard export packing considering the longer transit by sea shipments that can damage the valves and specifically painting of the valves. If the packing is not performed with extra safety the final goods reached to the customer may not be in position as it’s shipped.



Contact Us

Contact: JUNTAI

Phone: 0086-317-5518696

Tel: +86-317-5518696

E-mail: sales@canghai.co