Technology
From design and material selection to 100% pressure testing and shipped documentation — the manufacturing and quality workflow behind every Vexval valve.
Core Technical Capabilities
Six capabilities that keep our valves compliant, verifiable and fit for demanding service.
Standards-based Design & Selection
Structure and selection are confirmed against your actual service — medium, pressure class, temperature and end connection — on API 6D/600/609 and ASME B16.34 design bases.
Material & Sealing Selection
WCB, WC6/WC9, CF8/CF8M, duplex 2205/2507 and low-temperature LCB/LCC bodies, matched with PTFE/RPTFE/PEEK soft seats or 13Cr and Stellite metal hard seats (Trim 1/5/8).
Pressure Class Coverage Class 150–2500
Ball, gate, globe, butterfly, check, plug, control and safety valves plus actuators and accessories, covering Class 150 through Class 2500.
Inspection & Documentation Driven
EN 10204 3.1/3.2 material certificates, per-unit pressure test reports and an ITP with witness points ship with the goods so compliance review can proceed directly.
Certification Compliance
ISO 9001, CE/PED 2014/68/EU, API Monogram and ISO 15848 low-emission (fugitive emission) conformity for international oil, gas and process projects.
Custom & Drawing-based Manufacturing
Non-standard designs and manufacturing to customer drawings, supporting OEM and small-to-mid batch orders with a typical lead time of 4–10 weeks.
Manufacturing & Inspection Process
Eight controlled stages from design selection to packing and shipment.
Design & Selection Confirmation
Structure design and selection are completed against the actual service — medium, pressure class, temperature and connection standard — with API 6D and ASME B16.34 as design bases.
Casting & Forging of Rough Parts
Bodies and bonnets are cast (WCB/CF8/CF8M) or forged, with the chemical composition and mechanical properties of rough parts controlled to ASTM material standards.
CNC Machining
Bodies, seats, balls/gates/discs and stems are CNC machined with controlled fitting tolerances and sealing-face accuracy.
Welding & Overlay
Sealing faces are overlaid with 13Cr (Trim 1) or Stellite 6 (Trim 5) hardfacing to suit the service; pressure-containing welds are inspected by NDT to standard.
Assembly & Adjustment
Sealing elements, packing, actuators and accessories are assembled, with operating torque and travel set to standard.
Pressure Testing
Every valve undergoes shell strength testing (1.5× rated) and seat sealing tests (low- and high-pressure), with 100% pressure testing before shipment.
Inspection & Documentation Issue
EN 10204 3.1/3.2 material certificates, pressure test reports and the ITP inspection and test plan are issued; third-party witness by SGS/BV/TÜV can be arranged per project.
Coating, Packing & Shipment
Surface preparation, anti-corrosion coating, export packing to transport requirements, and shipping documents and marks with the goods.
Quality & Documentation Systems
Inspection, testing and traceability documentation covering every valve we ship.
Quality Inspection & Testing System (ITP)
Inspection and testing controls that follow a valve from incoming material verification to pre-shipment release, with every step documented and archived.
- Incoming material re-verification
- Shell strength and seat sealing tests
- EN 10204 3.1/3.2 material certificates
- Third-party witness (SGS / BV / TÜV)
- Full final inspection and record archiving before shipment
Technical Documentation & Traceability System
The document set that travels with every valve, making its material, test and certification records verifiable after delivery.
- Per-unit serial number and nameplate traceability
- Pressure test and inspection reports shipped with the goods
- Material and conformity certificate packages
- Project-specific ITP with witness points
- Remote technical and after-sales documentation support
Frequently Asked Questions
Quick answers about valve technology, standards and documentation.
球阀应该选全通径还是缩径？
蝶阀应该选软密封还是硬密封？
含 H₂S 酸性油气工况如何选材？
螺纹连接选 NPT 还是 BSP？
法兰连接用 RF 还是 RTJ？
DBB 和 DIB 有什么区别？
Technical Documents
Technical resources to support your valve selection and compliance review.
Valve Selection & Service Conditions Guide
How to select valves by medium, pressure class, temperature and end connection.
Body Material & Sealing / Trim Selection Note
How WCB, CF8M, duplex and low-temperature bodies pair with Trim numbers and soft or metal hard sealing.
ITP & Shipping Documentation Guide
The inspection and test plan, including EN 10204 certificates, pressure test reports and third-party witness.