A check valve, also known as a non-return valve, a check valve, or a reflux valve, is a valve used to control the unidirectional flow of fluid. The non-return valve is designed to prevent counter-flow of fluid in the pipe, that is, to prevent backflow of fluid in the opposite direction. The non-return valve, through its own structure or a device such as a spring, causes the valve to open when the fluid is flowing in the forward direction and close when it is flowing in the reverse direction, acting to prevent backflow.
This valve features a compact structure, an aesthetically pleasing design, excel...
Product Features: The pressure drop from the inlet to the outlet is very low. T...
This valve features a simple structure and high cost-effectiveness, with low fl...
Flange check valve refers to a valve that automatically opens and closes the val...
Plastic valves are the right choice when your piping system handles corrosive fluids, requires lightweight components, or operates in environments where metal corrosion is a persistent problem. In conditions where pressure stays below 1.0 MPa and temperature below 95°C, plastic valves weigh only 30–40% of equivalent ...
View MoreKEY FINDING Plastic pipe fittings are the core connection components of piping systems, directly impacting fluid transport safety and efficiency. Selecting compatible materials (such as PE, PP, PVC, PVDF) and matching pressure ratings (1.0-2.5 MPa) with temperature ranges (-40°C to +150°C) is the critical decision fo...
View MoreIn operating conditions where pressure is below 1.0 MPa, temperature is below 95°C, and the medium is corrosive liquid, plastic ball valves deliver significantly better overall cost-performance than metal ball valves. Their weight is only 30% to 40% of metal valves, installation costs are reduced by more than 50%, and...
View MoreWhat are some common materials used in Check Valve systems?
1. Brass – Excellent corrosion resistance and mechanical properties, suitable for general water and gas media.
2. Stainless Steel – High strength, resistant to high temperatures and pressures, widely used in harsh environments such as chemical and petroleum industries.
3. Cast Iron – High strength and pressure resistance, commonly used in large piping systems.
4. Carbon Steel/Forged Steel – Relatively low cost, suitable for medium-pressure industrial pipelines.
5. Special Alloys (such as alloy steel, titanium alloys) – Dedicated valves for high-temperature and highly corrosive environments.
How does a Check Valve prevent backflow in a hydraulic system?
1. Hydrodynamic Opening – When the oil flows forward, the fluid pressure overcomes the resistance of the spring or counterweight, opening the valve disc and ensuring unobstructed oil flow.
2. Back Pressure Closure – If reverse flow occurs, the back pressure instantaneously exceeds the valve disc's opening force, pressing the valve disc against the valve seat to form a seal and prevent oil backflow. 3. Self-locking structure – Swing or lift valves remain closed by their own weight or a spring after shutting down, making them difficult to reopen even if the system stops due to external impacts.
4. Water hammer prevention – By quickly closing the check valve, shock waves caused by backflow are eliminated, protecting the pump body and pipelines from damage.
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