What is a double control valve?
The double control valve is a plumbing installation that prevents back -up siphonage to protect fresh water supplies from contamination. This assembly is usually installed on the supply of fresh water for irrigation of the garden, combined chambers and fire suppression, where there is a risk of backflow contamination. The unit consists of two standard check valves mounted in a series in one cover. The basic concepts behind these valves include redundancy and more reliable seating of each valve. Larger double industrial control valves often include insulating valve at both ends and test taps at different points, while examples of residential examples are usually elegant, in-line patterns.
Back siphonage or backflow is the main source of freshwater contamination and has been positively associated with many outbreaks of water disease. Backflow contamination risks exist anywhere where fresh drinking water is used to feed fiery spraying systems, garden or farmIrrigation, chemical dosing or combined boilers. If no backflow protection is mounted to these settings, any significant decrease in fresh side pressure will see a contaminated water that rests back to the drinking power supply. The best way to protect freshwater stocks from this backflow is to install a back flow device such as a double control valve.
The checking valve is a relatively simple, robust and reliable one -way valve that relys on a spring or gravitational plunder or membrane so that fluids can flow in only one direction. This is usually achieved by the design of the valve in such a way that the valve disk opens when it is exposed to pressure from one side and is forced to be positively closed if the pressure drops or perverted. The double control valve is equipped with two such units mounted in the serieswith the way of water flow. The concept of this design is a double combination of redundancy and efficiency.
advantages for redundancy of double control valve are quite self -service; One valve is always able to back up the other in case of blocking or mechanism failure. In terms of efficiency, pressure differential is across two valves during operation that both are able to sit more efficiently, increasing the overall efficiency of the system. The flexibility of the double control valve is further increased by the inclusion of dual shut -off valves at both ends of the assembly that allow isolated both sides of the circuit if necessary. These and smaller test cocks used to test the functioning of the system are generally found on larger industrial variants. Domestic double control valves are generally smaller and simpler and are usually in-line patterns or are integrated into standard faucets or bib.