Comprehensive Technical Specifications
Component / Parameter | Standard Specification & Technical Value |
Brand / Manufacturer | SDF |
Valve Type | Fully Welded Body Ball Valve (Floating or Trunnion Mounted Design) |
Body Construction | One-Piece Full-Barrel Welded Structure (Zero Joint Leakage) |
Nominal Diameter | DN500 / 20 Inch |
Nominal Pressure | PN25 (2.5 MPa / Equivalent to intermediate ASME Class 150) |
Body Material | High-Grade Carbon Steel (P235GH / ST37.8 / ASTM A105 / A216 WCB) |
Ball Material | Stainless Steel (SS304 / SS316) or Electroless Nickel Plated Carbon Steel |
Seat / Sealing Material | PTFE + C (Carbon Reinforced) / PEEK / Devlon for Bubble-Tight Sealing |
Stem Sealing | Multi-O-Ring Sealing System with Secondary Sealant Injection |
End Connections | Butt-Weld Ends (BW) conforming to ASME B16.25 / EN 12627 |
Actuation Type | Enclosed Weatherproof Worm Gearbox with Handwheel |
Design Standards | API 6D, EN 14141, ASME B16.34, EN 12516 |
Face-to-Face Length | Standard Pipeline Manufacturer Dimensions or Custom Extension |
Key Features and Engineered Advantages
Zero-Leakage Fully Welded Architecture: The entire outer valve shell is formed by welding pre-fabricated forged or heavy-wall steel cylinders together. This eliminates structural weak points such as body flanges, studs, and nuts. This design ensures that the valve can withstand high structural piping stresses and bending moments without developing external micro-leaks.
Optimized for Direct-Buried Applications: Because there are no external gaskets or bolts subject to environmental corrosion, this valve is highly suited for direct underground burial. Extension stems and purge/drain pipes can be customized to allow operators to control the valve and check cavity pressure from ground level, eliminating the need to construct costly concrete valve pits.
Spring-Loaded Carbon-Reinforced Seats: The internal sealing rings utilize an advanced spring-loaded design that exerts continuous mechanical pressure against the polished stainless steel ball. This ensures tight sealing performance even under low-pressure conditions or during severe thermal fluctuations common in district heating networks.
Blow-out Proof Stem & Double O-Ring Protection: The stem is inserted from the inside of the valve body with an integral collar, preventing the stem from blowing out under internal line pressure. It features multiple redundant O-ring barriers alongside a graphite fire-safe packing ring to isolate the atmosphere from line media.
Dual Support Legs & Structural Stability: As shown in the reference file "15c760bb2cac14dd844d7bcad12a80cf.png", the valve is built with integrated, heavy-duty welded support feet. These feet distribute the massive weight of the DN500 assembly evenly onto concrete pads or trench beds, protecting the pipe weld joints from misalignment stress.
Typical Industry Applications
The SDF fully welded ball valve is a versatile component widely used across major civil infrastructure and energy transport sectors:
District Heating Networks (HVAC): Regulating and isolating main superheated water headers and urban steam distribution loops.
Natural Gas Distribution: City gate stations, gas storage facilities, and intermediate regional transmission lines.
Water Utilities & Transmission: Large-diameter municipal water mains, reservoir bypass systems, and industrial cooling water loops.
Petroleum Products Pipelines: Crude oil handling skids, tank farm isolation, and non-corrosive refined product transport.
Quality Control and Compliance Verification
Operating under municipal streets or cross-country pipelines requires uncompromised product tracking. SDF ensures peak performance through strict quality compliance:
Non-Destructive Testing (NDT): All structural body welds undergo 100% Ultrasonic Testing (UT) and Radiographic Testing (RT) to ensure full penetration and zero interior defects.
Pressure Isolation Calibration: Every assembly is subjected to mandatory hydrostatic shell tests and low-pressure pneumatic seat testing per API 598 and EN 12266-1 to ensure zero bubble leaks before leaving the plant.
Anti-Corrosion Coating: The outer body is blast-cleaned and coated with thick, high-build epoxy or polyurethane coatings tailored for direct burial, providing superior resistance to cathodic debonding and soil chemical reactions.
FAQ
1.When can I get a quotation?
We typically provide a quotation within 4 hours of receiving your inquiry. Urgent requests are given priority.
2.Do you support customized valves?
Yes. We support OEM and customized valves according to drawings, specifications, and special working conditions.
3.What is the production lead time?
Normally, production can be completed within 15 working days after order confirmation, depending on product type and quantity.
4.What standards do your valves comply with?
Our products comply with GB, ANSI, API, JIS, DIN, BS, and other international standards.
5.What pressure, size, and temperature ranges can you supply?
Pressure: Class 150-3500 Size: DN10-DN3000 Temperature: -196ºC to 610ºC
6.What certifications do you have?
We are certified with ISO 9001, CE, and provide third-party inspection and test reports upon request.
7.What delivery and payment terms do you offer?
Delivery terms: EXW, FOB, CFR, CIF
Payment terms: T/T (30% deposit + 70% balance), L/C, and other terms by agreement.
8.Do you provide technical support and spare parts?
Yes. We offer 24/7 technical support and supply spare and consumable parts for long-term service.
