Fully welded Ball Valve Q341F-16C
A fully welded ball valve spanning DN15 to DN350 at PN16, designed for mainline and branch isolation in district heating, gas distribution, and industrial fluid networks. The single forged-and-welded body has no bolts and no gaskets — continuous steel from flange face to flange face. Precision-ground ball matched to PTFE seats delivers tight shutoff across the full pressure range, with manual gearbox, electric, or pneumatic actuation mounting directly without adapter kits.
- Design Pressure: 1.6 MPa
- Shell Strength Test Pressure (Water): 2.4 MPa
- Sealing Test Pressure (Water): 1.8 MPa
- Sealing Test Pressure (Air): 0.6 MPa
- Working Temperature: -25°C to 120°C
- Applicable Medium：Water, Steam, Oil products, etc.
Technical Specifications
Technical Requirement
| Design & Manufacture | Face-to-Face Length of Valve | Flanged Connection of Valve | Inspection & Pressure Test | Temperature-Pressure Rating |
|---|---|---|---|---|
| GB/T 30818 | As per drawing regulations | GB/T 9113.1 | GB/T 26480 | GB/T 12224 |
Performance Specifications
| Design Pressure | Shell Strength Test Pressure (Water) | High-Pressure Sealing Test Pressure (Water) | Low-Pressure Sealing Test Pressure (Air) | Working Temperature | Applicable Medium |
|---|---|---|---|---|---|
| 1.6MPa | 2.4MPa | 1.8MPa | 0.6MPa | -25 to 120°C | Water, Steam, Oil products, etc. |
Material of Components
| No. | Component Name | Material | No. | Component Name | Material |
|---|---|---|---|---|---|
| 1 | Left/Right Body | Q235 | 11 | Stud Bolt | 35 |
| 2 | Valve Body | Q235 | 12 | Hex Nut | 25 |
| 3 | Spring Washer | SS321 | 13 | Standard Spring Washer | 65Mn |
| 4 | Fireproof Ring | Q235+ENP | 14 | Packing Gasket | C+PTFE |
| 5 | Valve Seat | C+PTFE | 15 | O-Ring | Fluororubber |
| 6 | O-Ring | Fluororubber | 16 | Connecting Plate | A105 |
| 7 | Ball | 304 | 17 | Packing Gland | 20Cr3 |
| 8 | Upper Stem | 20Cr13 | 18 | Parallel Key | 45 |
| 9 | Thrust Bearing | PTFE | 19 | Worm Gear Actuator | Assembly |
| 10 | Sliding Bearing | 25+Tin Bronze+PTFE |
Main Shape Size and Connection Size
| DN | L | D | K | Dmin | A |
|---|---|---|---|---|---|
| 250 | 730 | 405 | 355 | 200 | 351 |
| 300 | 850 | 460 | 410 | 250 | 426 |
| 350 | 980 | 520 | 470 | 300 | 510 |
Technical Drawings
Core Features & Advantages
1. Zero-Leakage Design Fully welded body — no bolts, no external leak paths, by design. Every potential leak point that exists on a bolted-body valve has been engineered out at the source.
2. Precision Sealing and Durable Construction Precision-ground ball matched to the seat for tight shutoff across the full pressure range — the sealing interface stays consistent from commissioning through decades of cycling. Carbon steel or stainless steel body withstands corrosion, pressure, and temperature extremes with a surface coating rated for long-term exposure.
3. Broad Applicability and Standardized Interfaces DN15–DN350, PN40. Covers water treatment, oil and gas, chemical processing, and pharmaceutical production from branch lines to main headers. Flanged ends with standard bolt patterns fit directly into existing piping — same installation and maintenance procedure valve to valve.
4. Flexible Operation and Low Maintenance Manual, electric, or pneumatic actuation on the same mounting interface — configure per site without modifying the valve body. All-welded construction cuts wear, extends operating life, and reduces lifecycle cost with fewer parts to inspect and replace.
5. Global Certifications Meets ISO, API, and CE standards for traceable quality and safety compliance — one set of certifications accepted across global markets with no re-qualification required.
Applications
- Municipal Water Supply and Distribution Systems
- HVAC Hydronic Systems
- Fire Protection Water Systems
- Industrial Cooling Water Circulation Systems
- Oil and Gas Low-Pressure Gathering Pipelines
- Chemical and Pharmaceutical Process Pipelines
- Agricultural Irrigation and Water Conservancy Projects
- Building Plumbing and Drainage Systems
- Compressed Air Systems
- Marine Ballast and Bilge Water Systems
Why Choose Fully welded Ball Valve Q341F-16C?
1. Zero-Leakage Body Single forged-and-welded assembly — zero body gaskets, zero body bolts, zero external leak paths. For buried service and inaccessible locations downstream, seal it once and move on.
2. Direct Burial Ready No body bolts to corrode, no body gaskets to degrade, no valve pit needed. Standard anti-corrosion wrap, straight into the ground — 30–50% less than building and maintaining valve chambers.
3. One-Piece Integrity, 30-Plus-Year Life Up to 40% lighter than bolted equivalents of the same pressure class, yet structurally stronger — a continuous pressure vessel with no joints to weaken under thermal cycling. No body gaskets to replace, no bolts to re-torque. Ball and seats accessible from top entry without cutting the valve out of the line.
4. One Platform, Any Actuation DN15 to DN350 on a single design standard — one spare parts family, one maintenance procedure across the entire installed base. Manual gearbox, electric, pneumatic, or hydraulic actuation mounts directly without adapter kits. Design for manual now, automate later without replacing the valve.
Why Q341F-16C in One Sentence A fully welded ball valve that goes into the ground once and stays sealed for three decades — lighter than bolted-body alternatives, stronger under thermal cycling, and built for district heating, oil, gas, and water transmission networks where long-term reliability is the only metric that counts.
