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| The SDF Compact Wafer Type Ball Valve (also commercially known as an ultra-thin ball valve) represents a premier engineering achievement in space-saving, high-integrity fluid isolation technology. In modern industrial fluid networks—ranging from compact chemical dosing skids to crowded factory utility headers—physical installation space and pipeline structural weight margins are increasingly restricted. Traditional flanged ball valves, while highly reliable, feature long face-to-face dimensions and heavy cast iron or steel bodies that require extensive piping footprints and heavy-duty structural hangers. The SDF series directly solves this design constraint by drastically shortening the valve body length into a highly compressed "wafer" profile. This allows the unit to slip easily and snugly between standard pipeline flanges, utilizing standard through-bolts to compress the entire joint into a single, highly integrated, and space-efficient assembly.The Wafer Type Ball Valve (ultra-thin ball valve) is a specialized product engineered for tight, compact industrial layouts where face-to-face installation space and total pipeline weight are strictly limited. By dramatically shortening the body length compared to traditional flanged ball valves, this unit slips easily between standard flanges. Despite its minimalist footprint, it features a robust full-bore ball, high-grade PTFE/RPTFE seats, and an integrated top pad that permits direct, bolt-on installation of pneumatic or electric actuators. | |||||||||
A common compromise in compact valve designs is the reduction of the internal port diameter, which forces the fluid through a restrictive orifice and generates significant pressure drop (P), localized turbulence, and structural piping vibrations. The SDF Compact Wafer Ball Valve avoids this operational liability by featuring a robust full-bore internal ball configuration.
When the valve is shifted into the fully open position, the cylindrical channel through the center of the ball aligns perfectly with the inner diameter of the adjacent piping. The fluid moves through the valve shell in a smooth, unobstructed path, virtually eliminating parasitic head loss and turbulence. This makes the valve highly efficient for loops handling viscous fluids, light slurries, or high-velocity water utilities where energy conservation is prioritized.
The sealing integrity of the SDF series relies on high-grade PTFE or RPTFE (Reinforced Polytetrafluoroethylene) valve seats. RPTFE incorporates a calculated percentage of glass fiber or carbon filler into the polymer matrix, significantly improving its structural resistance against cold flow deformation under continuous pressure while maintaining an exceptionally low coefficient of friction against the rotating ball sphere. This combination achieves a reliable, zero-leakage, bubble-tight shutoff across thousands of operational cycles.
The pressure-retaining wafer shell is cast or forged from high-integrity metals, such as Stainless Steel (CF8/CF8M) or Carbon Steel (WCB), providing high tensile strength and broad chemical compatibility. For automated environments, the valve top-works feature an integrated direct-mounting pad compliant with international standards. This enables the clean, bolt-on installation of pneumatic rack-and-pinion actuators or electric modulating heads without the need for bulky external adaptation brackets, preserving the valve's signature ultra-compact footprint.
Ultra-Thin Face-to-Face Dimension: Shortened wafer body design slashes total valve weight and face-to-face installation width compared to flanged variants, enabling placement in extremely tight piping spaces.
Zero-Restriction Full-Bore Cavity: Eliminates fluid restriction when fully open, ensuring high flow coefficients (Cv) and preventing pressure drops or solids accumulation.
Bubble-Tight RPTFE Sealing: Premium glass-fiber reinforced polymer seats handle thermal shifts and mechanical cycling while maintaining complete sealing compliance.
Integrated ISO Actuator Pad: Built-in top mounting pad allows direct, bracket-free coupling of pneumatic or electric automated actuators for immediate process automation.
Technical Parameter | Standard Engineering Specification | Options / Material Upgrades |
Nominal Size Range | DN15 to DN150 (1/2 inch to 6 inch) | Inquire for larger customized sizes |
Body Shell Metallurgy | Stainless Steel 304/316 (CF8 / CF8M) | Carbon Steel (WCB) for utility lines |
Ball and Stem Metallurgy | Stainless Steel 304 (SS304) / SS316 | Hastelloy / Alloy trim for harsh media |
Valve Seat Compounds | PTFE / RPTFE (Reinforced PTFE) | Carbon-filled PTFE for higher temperatures |
Nominal Pressure Class | PN10 / PN16 / Class 150 | PN25 / PN40 available upon request |
Flange Compatibility | ASME B16.5 Class 150 / EN 1092-1 PN16 | Fits seamlessly between standard flanges |
Actuator Top Interface | ISO 5211 Direct Mounting Pad | Fits levers, gears, or automation units |
Seat Leakage Rating | ANSI/FCI 70-2 Class VI / ISO 5208 Rate A | Zero-leakage bubble-tight validation |
The compressed wafer design makes this ball valve highly effective across compact industrial layouts and general utility networks:
Compact Skid Packages: Ideal for chemical dosing skids, water treatment modules, and modular containerized filtration systems where layout footprint is strictly limited.
Industrial Utility Headers: Reliable handling of factory compressed air lines, low-pressure clean water supplies, vacuum loops, and inert gas distribution networks.
Food & Pharmaceutical Clean Lines: Polished stainless steel configurations managing auxiliary clean-in-place (CIP) utilities and non-viscous fluid ingredient transfers.
Commercial Building HVAC Loops: Space-restricted chilled or hot water piping lines feeding large air handling units or localized thermal balancing loops.
To optimize sealing performance and maintain system safety when installing a wafer ball valve, follow these engineering guidelines:
Because wafer valves do not feature integrated flanges or independent threaded holes, they are clamped entirely by the compression force generated by long bolts passing between two adjacent pipeline flanges.
TECHNICAL WARNING: Installers must tighten these through-bolts in a strict star-pattern sequence using a calibrated torque wrench. Uneven or asymmetric bolt torquing will cause the pipeline flanges to pinch the valve at an angle, introducing structural warping to the internal RPTFE seats, which elevates operating torque and creates seat weeping leaks.
Like all floating-type soft-seated ball valves, the internal body cavity surrounding the ball can collect minute particles suspended in the process media. If the valve is placed in a line handling heavy pipeline scale, welding slag, or grit, these abrasive particulates can lodge behind the soft RPTFE seats, scratching the polished ball sphere and damaging the seal. Always ensure a Y-type pipeline strainer is installed upstream to trap particulates before they reach the soft valve seats.
When the ball valve is shifted into the fully closed position, a small volume of process fluid becomes trapped inside the internal cavity of the ball. If the valve handles ambiently volatile liquids or lines subject to sudden external heating, this trapped liquid can experience thermal expansion, causing a severe localized pressure spike inside the ball cavity. For volatile fluid loops, specify a ball with an integrated pressure-relief vent hole drilled into the upstream face of the ball to vent excess cavity pressure back upstream safely.
When utilizing the integrated ISO 5211 pad to install automated pneumatic or electric actuators, always include a minimum 25% to 30% torque safety margin above the valve's baseline dry breakaway torque catalog value. If the valve remains closed or un-cycled for extended periods under continuous line pressure, the soft polymer seats will experience a natural compression set around the ball edges, creating a brief torque spike during the initial opening stroke. Sizing the actuator with an adequate power margin ensures reliable, stall-free operation.
Perfect for compact industrial machinery skids, water desalination piping, vacuum systems, and space-constrained areas in chemical and water treatment plants.
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 to Class 3500
Size: DN10 to DN3000
Temperature: -196 degrees C to 610 degrees C
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.
