Product Overview
Engineered Flange & Valve Solutions for Demanding Industrial Piping Systems
Qiaodi Steel supplies a comprehensive range of stainless steel flanges and high-performance industrial valves designed to withstand high pressure, extreme temperatures, and corrosive environments. Based in Wuxi—China’s hub for stainless steel and industrial metal distribution—we serve global contractors, valve stockists, and EPC project managers.
Our forged flanges and industrial valves are engineered in strict compliance with major international standards, including ASME B16.5, ASME B16.47, EN 1092-1, DIN, API 600, and API 6D. Whether you need high-pressure Weld Neck flanges for oil and gas applications or corrosion-resistant stainless steel ball valves for chemical plants, we deliver 100% heat-traceable products with guaranteed pressure tightness.
Main Product Lines
A. Stainless Steel Flanges (Forged Piping Flanges)
- Weld Neck Flanges (WN): Designed for high-pressure, severe-temperature environments by transferring stress to the pipe.
- Slip-On Flanges (SO): Easy-to-install welded flanges ideal for low-pressure, cost-effective piping layouts.
- Blind Flanges (BL): Used to seal the ends of piping systems or pressure vessel openings for maintenance and inspection.
- Socket Weld (SW) & Threaded Flanges (TH): Specialized forged flanges for small-diameter, high-pressure, or non-welding application areas.
- Lap Joint Flanges (LJ): Used with stub ends for systems requiring frequent dismantling and bolt alignment.
B. Industrial Valves (Flow & Pressure Control)
- Ball Valves (1-PC, 2-PC, 3-PC, Flanged / Threaded): Fast, quarter-turn shutoff valves for versatile chemical and liquid process control.
- Gate Valves (API 600 / DIN): Bi-directional isolation valves providing straight-through flow with minimum pressure drop.
- Globe Valves: Precision throttling valves engineered for accurate flow control and frequent operation.
- Check Valves (Swing, Lift, Dual Plate): Automatic non-return valves designed to prevent backflow and protect pumps/turbines.
- Butterfly Valves (Wafer, Lug, Flanged): Compact, lightweight flow regulation valves for large-diameter water and utility lines.
Technical Specifications & Material Range
Headline: Technical Specifications & Pressure Ratings
| Parameter | Forged Industrial Flanges | Stainless Steel Industrial Valves |
| Size Range | 1/2” to 60” (DN15 – DN1500) | 1/2” to 24” (DN15 – DN600) |
| Pressure Ratings | Class 150LB to 2500LB / PN6 to PN100 | Class 150LB to 1500LB / PN10 to PN64 / 1000 WOG |
| Material Grades | ASTM A182 F304/304L, F316/316L, F321, Duplex 2205/2507 | CF8 (304), CF8M (316), CF3 (304L), CF3M (316L), WCB |
| Design Standards | ASME B16.5, ASME B16.47, EN 1092-1, DIN 2527/2633 | API 600, API 6D, API 598, BS 5351, DIN 3356, ASME B16.34 |
| Facing / Ends | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) | Flanged, Threaded (NPT/BSPT), Butt-Weld, Socket-Weld |
| Operation Type | Manual Bolts & Gasket Assemblies | Manual Handwheel, Lever, Pneumatic Actuator, Electric Actuator |
Quality Control & Pressure Integrity
- Forging & Machining Precision: CNC-machined flange faces and valve seats ensuring zero distortion and perfect sealing capability.
- 100% Hydrostatic & Shell Testing: Every valve undergoes shell and seat pressure testing in accordance with API 598 / EN 12266-1 before shipment.
- Material Verification:
- PMI (Positive Material Identification) chemical element analysis on every single batch.
- Ultrasonic Testing (UT) for high-pressure forged flanges.
- Full Documentation: Accompanied by EN 10204 3.1 Mill Test Certificates (MTC) detailing mechanical performance, pressure test logs, and chemical heat numbers.
Seaworthy Packaging & Flange Face Protection
- Machined Face Protection: Plastic protective covers fitted on flange raised faces (RF) and valve end flanges to prevent scratches and impact during transit.
- Thread & Body Protection: Plastic caps on threaded/SW ports; valve handwheels securely bound.
- Heavy-Duty Export Cases: Packed in seaworthy plywood cases or sturdy wooden pallets wrapped in moisture-proof plastic film to withstand long ocean transport.