dual disc check valve Description
Double-flap check valve is a valve that controls the one-way flow of media through a double-flap structure. It is designed to reduce hydraulic shock and is suitable for large and medium-diameter pipeline systems.
Core structural features
Double-flap design: Two symmetrical disc-shaped discs rotate around the pin in the valve seat. The disc closes quickly during reverse flow (closing time ≤ 0.3 seconds) to reduce the water hammer effect;
Compact layout: The clamp-type connection structure makes its length only 1/4~1/8 of the traditional flange check valve, and the weight is reduced by 30%~50%, which is suitable for space-constrained scenarios;
Sealing form: The disc surface can be welded with hard alloy or covered with PTFE coating, and the leakage level reaches ANSI Class VI.
dual disc check valve specification
Size: 2" - 32"
Material: Cast Iron, Ductile iron, WCB, CF8, CF8M, CF3, CF3M etc.
Design & Manufacture Std.: API594, ASME B16.34, API 6D, JISB2074-JISB2084, BS1868
Flange Connection ASME B16.5, ASME B16.47, JISB2212-JISB2214, DIN2543-2550
Face to Face Std.: ASMEB16.10, API 6D, JISB2002, DIN3202, EN558
Test Standard: API598, API 6D JISB2003
dual disc check valve
Selection and installation specifications
Key points for selection
Material matching: For corrosive media, use 316L stainless steel valve body + PTFE coated valve disc; for high-temperature steam pipelines (≤425℃), use chrome-molybdenum steel; Pressure adaptation: For low-pressure systems (≤1.6MPa), use the wafer type first; for high-pressure environments (≥6.4MPa), use flange-connected reinforced valve bodies.
Installation requirements
For horizontal pipeline installation only, the valve body must be marked with a flow arrow to ensure that it is consistent with the flow direction of the medium;
Large-diameter valves (DN≥300) require independent support frames to avoid valve disc deflection caused by pipeline stress.
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