The DFD series flange connection 2/2-way solenoid valve is a high-performance, pilot-operated automated control valve specifically engineered for large-caliber, high-flow industrial piping systems. Depending on system control configurations, it is available in normally closed (opens when energized, closes when de-energized) and normally open (closes when energized, opens when de-energized, designated with a "K" suffix) types. Featuring a standardized flanged connection structure (compliant with GB, ANSI, DIN, etc.), it substantially enhances connection strength and sealing reliability in high-pressure, large-diameter pipeline networks. Its core design focuses on maximum flow capacity, low flow resistance losses, and zero-leakage shut-off performance, enabling rapid and reliable remote on-off control for various media including water, liquids, gases, and light oils (≤ 20 cSt). The valve body options include premium cast steel, SS304, and SS316 stainless steel. Coupled with a highly efficient electromagnetic coil actuator, it ensures absolute safety and an extended service life for industrial piping systems under high-frequency switching and thermal shocks alternating from -20°C to 65°C.

Product Image:DFD Threaded 2-Way 2-Position (Normally Closed) Solenoid Valve

Feature

Flanged Connection & Robust Pressure Retention: Utilizes standard industrial flange interfaces to effectively withstand axial stress and pipeline vibration inherent in large-diameter piping. The large contact area of the sealing face ensures high mechanical strength, completely eliminating cross-threading or leakage vulnerabilities common to threaded connections in large-bore operations.

Efficient Pilot-Operated High-Flow Drive: Employs a pilot-operated diaphragm or piston structure that utilizes the medium's own differential pressure to effortlessly open and close large-orifice valves (ranging from DN25 to DN300 and above). The coil features low power consumption, rapid action, and high responsiveness. The normally open and normally closed models perfectly match different fail-safe modes.

Excellent Media Compatibility: Offers multiple valve body materials including cast steel, 304 stainless steel, and 316 stainless steel. The sealing pair utilizes high-performance elastomers or modified FKM, ensuring no impurity precipitation during long-term contact with water, gas, or light oil, thus maintaining high media purity.

Precision Leak Prevention & Flow Channel Optimization: The flanged valve body flow channels are optimized via 3D computational fluid dynamics (CFD) simulation to provide an ultra-high flow coefficient (Kv value) and minimal pressure drop. Combined with precisely machined pilot holes and balance holes, it supports nominal pressures from 0.3 to 16 bar, guaranteeing tight, zero-leakage closure.

Modular Design & Easy Maintenance: Specifically developed for modern industrial fluid pipelines and modular equipment integration. The flanged structure allows extremely convenient on-line disassembly and routine maintenance of the valve without the need to cut or extensively displace the pipelines.