How a CHECK VALVE works - hydraulic valve - clapet - ball - butterfly

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Valves are shut-off or regulating equipment placed along the path of a fluid stream.In this video we will show you how a check valve works. Watch alsothe other videos on our playlist tofind out all the other types of valves we use every day.JAES, for over a decade has been providing its customer with the best solutions for their supply chain and in their catalogue you can find any kind of valve from the leading manufacturers.The check valve, also callednon-return valve is a one-way valve, where fluids flow in one direction only. For instance, in the hydraulic field they are installed on the circulation pump pipesand on the autoclave, since they nullifythe water hammereffect; a phenomena which we’ve explained on our last video.This valve is composedofan element bound by a guide which is pushed againstthe base of the valveby a spring.When the fluid flows andthere is enoughpressure, the valve will open lettingthe fluid to passthrough; on the other hand, if there isn’tenough pressure or if the fluid is flowing from the opposite side, the valve staysclosed; this iswhy it is also known asnon-return valve, because it doesn’t letthe fluid to flow back. There are several types of check valves, let’s see themin detail:1-Swing check valves, consisting of a flat disk; they are mostlyused in inner tubes, in which they inflatethe tire without letting the aircomingout from inside.2-Ball check valve, which consists of a small metal ball, also calleddrive sphere, which is located inside a cylindrical well, and a spring thatcounteracts the movement of the sphere.The well is blockedat the top by a ring nut of smaller diameter than the sphere, wherethe latter can leanwithout getting out.3-Butterfly check valve with counterweight, which has a flat disk sectioned in the center and a spring that closesthe valve. Its movement resembles the butterfly's wings.The main advantage of the check valve is the absence of backflow and water hammer, which could damage the pipes.However,this valve also has some disadvantages, such as Leakage, whena large amount of grime is placed between thebase of the valve and its disk, so that the valve can’t close properly. Another disadvantage is the locking, whena bad sliding of the guide doesn’t let the plateto close completely, and most of the times the cause is due to theoxidation of the components. Check valves are part of Safety Valves category, because theyincrease the safety level of a thermo-hydraulic system. For example,non-return butterfly valves are safety valves used in water pumping systems.There are many applications for this type of valve; it is used in industrial processes for fluids management, such as in power plants, nuclear plants for waste lines, make-up water, while in the aerospace field they are used in propulsion systems for fuel pipes. They are often used when different types of gases have to be mixed. The return valves are placedon both ends of the pipes in orderto prevent the mixing of gas inthe original source.For example, if a fuel and an oxidizer have to be mixed, check valves will normally be placedon both the fuel and the oxidizerendsto ensure that the original gas cylinders remain pure and therefore non-flammable.The efficiency of a non-return valve is also affected by the wear of its components, such as the closing spring which tends to wear out easily, which is why the valve must be inspected constantly to prevent the fluid from flowing tothe opposite direction.In this video we have seen how a check valve works but do you know how many types of valves we use daily? Watch the videos of our playlist, you will discover all the types of valves that surround us. If you found this video useful, please let us know by leaving a like and a comment. You can also share it, and don't forget to subscribe to our YouTube channel. Find outmore aboutour next projects by visiting our website: jaescompany.com.