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| The SDF Dual Plate Wafer Type Check Valve represents a revolutionary leap forward in fluid dynamics and piping efficiency, specifically engineered to replace traditional, bulky swing check valves. In modern fluid engineering, spatial constraints and structural load management are critical design factors. This valve addresses both challenges by featuring an ultra-short, compact wafer profile designed to fit snugly between standard pipeline flanges. Held in place by the compression of the flange bolts, its lightweight, flangeless body completely eliminates heavy external bolt flanges, saving significant material costs and footprint. Advanced Dynamics & Reverse-Flow Mitigation Unlike standard single-disc check valves that rely strictly on gravitational force or backpressure to close—often resulting in delayed action and violent slamming—the SDF series incorporates a sophisticated dual-plate design backed by heavy-duty internal torsion springs. When forward fluid flow initiates, the twin semi-circular plates pivot smoothly on a central hinge pin, presenting minimal resistance and ensuring an optimal aerodynamic flow profile that minimizes pressure drop. The moment the forward fluid velocity drops to zero—and before reverse flow can gain any kinetic momentum—the pre-loaded torsion springs force the plates to close rapidly and silently. This proactive mechanism achieves near-instantaneous shut-off, mitigating the destructive shock waves of water hammer and protecting fragile downstream equipment such as pumps, flow meters, and sensitive instrumentation. Premium Material Architecture The internal engineering of the SDF series emphasizes longevity under high-frequency cycling. The twin plates, center pin, and torsion springs are meticulously crafted from high-grade stainless steel or specialized alloys to resist corrosion and erosion. The independent spring design applies equalized force across both plates, ensuring uniform wear on the sealing seat. Depending on the operational media, the valve can be configured with either resilient elastomer seats (such as EPDM, NBR, or Viton) for bubble-tight, zero-leakage sealing at lower temperatures, or precision-machined metal-to-metal seats for rugged industrial services. | |||||||||
SDF
• Ultra-Short Face-to-Face Profile: Minimizes the physical installation space and reduces total valve weight by up to 80% compared to flanged check valves.
• Advanced Water Hammer Prevention: Torsion spring-loaded plates close rapidly at zero flow velocity, preventing fluid back-surge and protecting sensitive pumps.
• Flexible Installation Geometry: The compact, guided structure allows for trouble-free installation in both horizontal and vertical upward-flowing pipelines.
• Low Opening Pressure (Cracking Pressure): Optimized disc geometry and spring tension allow the valve to open fully under minimal fluid pressure, saving system energy.
Widely used in space-constrained installations such as high-rise building HVAC networks, municipal water pumping stations, sea water desalination plants, and industrial cooling systems.
The space-saving profile and rapid closure dynamics make the SDF Dual Plate Wafer Type Check Valve the premier choice across a vast array of fluid handling sectors:
Industrial Sector | Typical Application System | Environmental Conditions |
Commercial HVAC | Chilled & Hot Water Circulation | Strict space limitations, high-rise head pressures |
Water Treatment | Desalination, Municipal Pumping | High flow rates, corrosive media (seawater) |
Industrial Cooling | Cooling Tower Feed Lines | Frequent pump cycling, water hammer risks |
Marine & Offshore | Shipboard Ballast & Bilge Piping | Compact layouts, high vibration resistance |
Chemical Processing | Process Water Distribution | Low pressure drop requirements, chemical compatibility |
To maximize the efficiency and lifetime of your wafer check valve, apply these professional selection parameters during your piping layout design:
To ensure smooth operation, check valves should be selected based on flow velocity, not just the line size. Ensure that the system’s minimum continuous flow is high enough to hold both plates completely open. Running a valve in a partially open state due to a low-velocity flow will cause the plates to "flutter," accelerating spring fatigue and causing premature wear on the hinge pins.
Choose Resilient Seats (EPDM / NBR) for water, air, and general utilities up to 120°C where absolute bubble-tight shut-off (zero weeping) is required.
Choose Viton (FKM) for oil, hydrocarbons, or elevated chemical temperatures.
Choose Metal-to-Metal Seats for severe services, high temperatures, or media containing abrasive particulates that would easily tear soft elastomers.
Wafer check valves are sensitive to turbulent flow profiles caused by upstream fittings. To ensure uniform force on both plates, always install the valve with a straight run of pipe equal to at least 5 times the pipe diameter (5D) downstream from pumps or elbows, and at least 2 times the pipe diameter (2D) away from downstream fittings.
During installation between flanges, precise centring is vital. If the valve is misaligned or shifted off-center, the edges of the dual plates may clip or scrape against the inner wall of the companion pipe or flange, preventing the valve from opening fully or closing tightly.
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.
