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China Suppliers Factory Double Disc Dual Check Valve Non-return Spring Type Full-Lined Rubber for Backflow Prevention
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.
Frequently Asked Questions
Q
What materials are recommended for check valves based on application?
For hydraulic systems, high-strength alloy materials are recommended to withstand large pressure impacts. Air compressor systems benefit from lightweight and wear-resistant materials to reduce energy consumption. For acidic or alkaline environments, corrosion-resistant plastics are preferred.
Q
How does a pilot-operated check valve differ structurally from a one-way check valve?
A pilot-operated check valve consists of a main valve and a pilot mechanism for precise fluid control in complex circuits. In contrast, a one-way check valve features a simpler design with a single valve disc and a return spring, ensuring unidirectional flow with minimal maintenance.
Q
What are the specific installation requirements for swing and lift check valves?
Swing check valves should be installed horizontally to ensure the free swing of the valve disc. Lift check valves are designed for vertical installation so they can utilize gravity for tight closing.
Q
In which industries are check valves commonly used?
They are widely used in the petrochemical industry (crude oil transmission pipelines), air conditioning systems (maintaining stable refrigerant flow), and water pump systems (preventing cavitation caused by backflow).
Q
What sizes and standards do these double disc check valves support?
These check valves are available in sizes ranging from DN50 to DN1200 and comply with international standards including DIN, ANSI, GOST, JIS, and BS.