A check valve, non-return valve, reflux valve, or one-way valve is a valve that normally allows fluids to flow through it in only one direction and these are available in Bronze / Brass / Cast Iron and Ductile iron Construction. Plumbing Check Valves are used for preventing the backflow inside a piping system. It is also regarded as a non-return valve or NRV. The valve gets opened by the pressure of the fluid passing through a pipeline and gets closed by the reversal of flow. The valve also allows an unobstructed flow and gets shut down automatically with the decrease of the pressure. Depending on the valve’s mechanism the exact operation will vary.
Check valves are mainly used in a piping system to prevent backflow. The discharge line of rotary equipment such as pumps and compressors always fitted with a check valve to prevent backflow. Different types available are swing type, Lift Type, Wafer style, Globe style. Typical applications are Commercial, Industrial, and HVAC.
For a swing type of plumbing check valve, the disc is unguided as it completely closes or opens. Whenever there is a flow in the line, this valve starts functioning and gets completely closed when there is no flow. Pressure drops and Turbulence is very low in the valve. Conventionally, the Disk and seat designs are mostly of metal to composite or metal to metal. The angle between the seat and the vertical plane which is also known as the seating angle differs from 0 to 45 degrees. Mostly, the angles of the seats lie in the range of 5-7 degrees. The disc travel is reduced by larger seat angles that ultimately result in quicker closing and finally decrease the possibility of a water hammer. Full unobstructed flow is allowed by the swing check valve which automatically closes with the decrease of pressure.
Mainly for high-pressure service in which the velocity of flow is very high, Lift Check Valves are mostly used. The on the seat with full contact, the disc is set and these valves are extremely handy for being installed in vertical or horizontal pipelines having upward flow. A disk is raised from the seat when the flow enters below the seat, by the pressure of the upward flow. The backflow and gravity force the disk to set down on the seat when the flow stops or reverses. They are highly used in piping systems that use globe valves for controlling the flow.
In a Dual Check valve, like the name itself, two halves of the disc are moving towards the centreline with the reverse flow and forward flow two halves rest and open on the seat for closing the flow. In low-pressure liquid and gaseous services, the use of Dual Plate Check Valve is popular. It is compact and lightweight in construction, which makes it an amazing choice in cases where convenience and space are vital. Compared to conventional full-body plumbing check valves, these are around 90% lighter. They are frequently used in systems where butterfly valves are in use. Compared to other types, the cost of installation & maintenance is very low.
A spring-loaded, double guided poppet system is there in Silent check valves that reduce water hammer and boosts efficiency while preventing reversal of flow. Assured drop tight closure with specially designed bronze to bronze seats. Reliable maintenance-free operation is provided by the stainless. Often in various applications, the Plumbing Check Valves are used. Like for instance, they are placed often on the pump’s outlet side for offering protection to the pump from the backflow. These pumps are every common variant of water pumps and are not self-priming. So, these valves are very important for keeping water inside the pipes. These valves are also often used in HVAC systems. These systems are used in large buildings where a coolant has been pumped several stories up. The plumbing check valves are installed for ensuring that the coolant does not flush them back down.
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Swing Check Valve - DZR Brass
Lift Check Valve - Brass
Swing Check Valve - Brass
Swing Check Valve - Bronze
Swing Check Valve - Ductile Iron
Dual Plate Check Valve - Ductile Iron
Silent Check Valve - Ductile Iron
Lift Check Valve - Bronze