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A plumbing double check valve is a backflow presenter that has been designed for protecting the sources of water from getting contaminated. Also, it is a valve that is used mostly in compressed air braking systems of heavy trucks. It comprises two non-return valves that are series-connected. Two principles of operation are used by this: firstly, the check valve will always act, even if the other one is blocked in the open position, secondly the pressure differential across the other reduces when one valve is closed, and this allows for a much more reliable seal and prevents the minor leaks. Barely, the small valve is noticeable, mainly when it is integrated into existing valve bodies. With end ball valves for testing and insulation, larger plumbing double check valves can be installed. The test valves are often in place for attaching the test equipment for assessing whether the double check assembly is still in operation. For the prevention of siphoning and back pressure, the double check valve is suitable but for high-risk applications, it is not suitable. Commonly for lawn fire sprinklers, irrigation systems and mixed boilers, it is used. A relatively low risk like the use of antifreeze in the sprinkler system, if the hazard is much higher, even a much more reliable sanitary check valve like a reduced pressure zone device is mandatory.
Backflow is the reversal of the flow of a liquid, gas, or solid into the clean or potable water supply. Backflow happens due to backpressure or due to the back siphoning of the plumbing system. If the water is pure, backflow is not a serious concern. But if the water is contaminated and contains chemicals and harmful bacteria, backflow can pose serious health and safety hazards.
A backflow preventer is quite effective in preventing this. It helps protect potable water supplies from contamination or pollution due to backflow. A backflow preventer though simple in design is ingenious in its working.
Preventing backflow is essential and your first line of defense is to install a backflow preventer.
Plumbing Double Check Valves holds an element of ring shape known as the seat in a place that extends from the inside walls to the center-line of the pipe but does not get closed completely. A mechanism for plugging like the ball or piston rests in the seat. Another type of plugging device is a swinging disc. When the pressure is high enough and goes in the desired direction, the stopper gets lifted away from the seat which opens the gap for allowing the process steam for freely flowing. The plug then gets pushed by the reverse flow back inside the hole which created an air-tight seal that will not get opened again unless the forward flow pressure is higher than the backpressure. As the check valves allow the flowing of the steam only in one direction, the system will remain clean. Double-check valves specifically comprise two spring check valves which are assembled sequentially mostly with a gate or ball valve present on each end. Plumbing Double Check Valves are having several valves which are working together for many reasons. Firstly, one valve still is able to act even if the other gets hammed. Again, a more reliable seal can happen when one valve remains closed as this decreases the differential pressure over the other and stops the leaking of any type.
If you are in search of Plumbing Double Check Valves in the Middle East, then get the most advanced and reliable options from Dutco Tennant LLC.