Double Disc Dual Check Valve Non-return Spring Type Full-Lined Rubber
Engineered with cast iron (sturdy, cost-efficient) or stainless steel (corrosion-proof), this full-lined rubber valve features a protective rubber lining for enhanced durability. Its EPDM/NBR seals offer versatile adaptability—EPDM excels in high temps (-15°C to 130°C), NBR resists oils/greases. The dual-disc structure ensures smooth flow and minimal pressure loss, while inline installation simplifies setup. Ideal for municipal water, wastewater, and light industrial systems, complying with ISO 7126-2 standards for reliable backflow prevention.
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product specification
| Product Name | Check Valve | Material | Ductile Iron/Stainless Steel |
| Type | Double disc | Medium | Water/Sea water |
| Size | DN50-DN1200 | Seal | EPDM/NBR rubber |
| Power | Automatic | Standard | DIN/ANSI/GOST/JIS/BS |
product description
The material of check valves is closely related to their service life and performance. For hydraulic systems, check valves are often made of high-strength alloy materials that can withstand large pressure impacts. For air compressor systems, lightweight and wear-resistant materials are preferred to reduce energy consumption during operation. Additionally, some special-purpose check valves use corrosion-resistant plastics for use in acidic or alkaline fluid environments.
Structurally, the pilot-operated check valve consists of a main valve and a pilot mechanism. This design allows it to control fluid flow precisely, even in complex hydraulic circuits. The one-way check valve has a simple structure with a single valve disc and a return spring, ensuring unidirectional fluid flow with minimal maintenance needs.
In usage, different types of check valves have specific installation requirements. For example, swing check valves should be installed horizontally to ensure the free swing of the valve disc. Lift check valves are suitable for vertical installation to utilize the disc’s gravity for tight closing.
Their uses extend to various industries. In the petrochemical industry, they are installed in crude oil transmission pipelines to prevent reverse flow of flammable fluids. In air conditioning systems, air check valves maintain stable refrigerant flow, improving the efficiency of cooling cycles. They are also commonly adopted in water pump systems to avoid pump cavitation caused by backflow.
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