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...
1. Rapid Assembly: Socket Fusion Fittings utilize a hot-melt socket welding process. Welding is completed simply by inserting the pipe into the sleeve and heating for tens of seconds. The overall operation time is significantly shorter than the minutes or even hours required for traditional arc or gas welding. 2. Low O...
View More1. High Temperature Resistance Taking fluoroplastics (PTFE, FEP, PVDF, ETFE, PFA) as an example, their maximum operating temperature can reach 260℃, with a low temperature limit above -18℃. Conventional plastic piping (such as PPR and PVC) can be used stably for a long time below 90℃, but softening or even failure will...
View More1. Determine the Media Characteristics First, determine whether the medium being transported by the plastic pipe is water, oil, chemical solvents, or gas. Select materials based on its corrosiveness, viscosity, and temperature range. PPR is suitable for hot water, PVC for acid and alkali media, and PE-RT for low-temper...
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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