Core Advantages & Technical Features
Bi-Directional Dead-End Service Capability: The threaded lug body allows downstream piping to be removed while maintaining full upstream line pressure. This facilitates safe, localized pipe maintenance and system cleaning layouts.
Frictionless Eccentric Geometry: Utilizing an optimized eccentric stem and disc offset design, the valve disc lifts smoothly out of the seat almost instantaneously upon opening. This design eliminates localized scrubbing and wiping wear, dramatically extending the operational lifespan of the sealing surface.
High-Torque Pneumatic Actuation: Combined with a rugged, anodized aluminum dual-piston rack-and-pinion pneumatic actuator. It supports double-acting or spring-return (fail-safe close/open) protocols and accepts standardized NAMUR solenoid valve and limit switch box mountings.
Advanced Fire-Safe Sealing Architecture: Available with standard metal-to-metal or fire-safe dual seats (PTFE/Stellite mixed layers). The zero-leakage design complies with strict international fugitive emission and fire safety thresholds under severe thermal shifts.
Streamlined Disc Profile for Maximum Flow: The low-profile, contoured disc design minimizes fluid turbulence and fluid resistance, yielding an exceptionally high flow coefficient (Cv) and lowering structural pressure drop across the processing plant.
Target Applications & Operating Conditions
This industrial-grade lug butterfly valve is specifically built to handle volumetric chemical streams, water treatment loops, and industrial utilities:
Water & Wastewater Processing Header Networks: Ideal for municipal water distribution, high-pressure desalination facilities, pump isolation stations, and wastewater treatment sludge handling lines.
HVAC & Industrial Cooling Water Systems: Manages main condenser water loops, chilling tower isolation headers, and heavy industrial plant utility utility water distribution.
Chemical Processing & Hydrocarbon Logistics: Controls the flow of non-aggressive chemicals, dilute acids, alkaline fluids, polymers, and non-potable processing water in chemical refining plants.
Bulk Material & Pneumatic Conveying Systems: Applied as an isolation boundary valve for powder handling, dry ash disposal paths, and industrial low-pressure pneumatic air supply networks.
Selection & Engineering Guidelines
When implementing the SDF heavy-duty lug butterfly valve into pipeline layouts, technical teams must consider the following engineering parameters:
Seat Material Selection Mapping: Specify reinforced PTFE (RPTFE) for standard chemical or water utility services up to 180°C to guarantee smooth operation and lowest torque. For high-temperature utility or steam service exceeding 200°C, a laminated triple-offset metal seat configuration must be specified.
Flange Compatibility & Bolt Pattern Matching: Ensure the lug body drilling matches the exact piping standard specified (e.g., ASME B16.5 Class 150 or EN 1092-1 PN16). Thread depths within the lugs must be cross-referenced with flange and gasket thicknesses during bolt selection.
Pneumatic Supply Pressure Calibration: The sizing of the pneumatic actuator is based on an available air supply pressure (typically 5.0 Bar to 7.0 Bar). If field air supply fluctuates, an appropriate sizing margin must be integrated to prevent incomplete seal seating under maximum differential pressure (ΔP).
Standard Technical Specifications
Technical Parameter | Standard Specification Value / Compliance |
|---|
Design & Manufacturing Standards | API 609, ASME B16.34, EN 593, ISO 5752 |
Nominal Pipe Diameters (DN / NPS) | NPS 2" to NPS 48" / DN50 to DN1200 |
Pressure Ratings & Classes | ASME Class 150, Class 300 / PN10, PN16, PN25 |
Body Material Options | Ductile Iron (A536), Carbon Steel (WCB), Stainless Steel (CF8/CF8M) |
Disc Material Options | Stainless Steel 304 / 316 (Polished/Duplex), Al-Bronze |
Seat & Seal Compounds | NBR, EPDM, PTFE, RPTFE, Laminated Metal-to-Metal |
Face-to-Face Dimensions | According to API 609 Table 2, ISO 5752 Short Series |
Actuation Interface | ISO 5211 Top Flange with Pneumatic Rack & Pinion Actuator |
Control Accessories (Optional) | Namur Solenoid Valve, Electro-Pneumatic Positioner (4-20mA), Limit Switches |
Pressure & Leakage Verification | API 598, ISO 5208 Rate A (Zero-bubble resilient shutoff) |
Applications
Commonly installed on pump discharge lines, cooling towers, industrial processing systems, and marine / shipbuilding piping loops.
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.
