The Classifications and Functions of Bronze Check Valves

Bronze check valves are typically installed in pipelines for the purpose of permitting flow of fluids in one direction only, preventing the occurrence of a reverse flow. They react to the line fluid and therefore do not usually require external actuation. Check valves should not replace an isolation valve, whose main function is to contain a flow in a particular section of the pipe.

Aside from preventing reverse flow when the system is shut down, bronze check valves are used to fulfill a number of objectives. One of these objectives is to protect a section of a system or equipment that can potentially be damaged by reverse flows. Examples of such items include strainers, control valves and flow meters. Check valves are also used to control the pressure surges created by hydraulic forces. In addition, such device can prevent flooding and relieve vacuum conditions.

Bronze check valves come in a number of designs, which are made to suit certain applications. The major classifications of a bronze check valve include lift check, swing check, disc check and wafer check. Lift check valves share the same configuration with globe valves. However, the disc or plug used in such a valve is operated automatically. Lift check valves are simpler than other designs and are more suitable for applications where leakage is minimal during reverse flow situations. They are more commonly used to prevent reverse flow condensate as opposed to water applications.

Swing check valves is mainly composed of a flap or disc, which has the same diameter as the valve's pipe bore. Swing check valves creates a high flow resistance in the open position because of the disc's weight. Sudden changes in flow may cause the disc to slam against the valve seat, potentially damaging in the long run. Disc check valves, on the other hand, are equipped with a disc, a spring and spring retainer. The retainer holds the spring, which in turn, apply resistance to the flow of the liquid. Although disc check valves are smaller and lighter, they can have more complicated design. This type of disc check is not to be utilized in flows which are heavily pulsating.

A wafer check valve is the less costly alternative to swing check and lift valves. Compared to other kinds of bronze check valves, wafer check valves are less bulky and made to fit between a set of flanges. They can be used in several applications, including boiler feedlines, vacuum breakers, steam traps, blending applications, protection of pipeline fitting, and hot water circuits. The other classifications of a bronze check valve that businesses can choose from include diaphragm check valve, ball check valve, tilting disc check valve. These devices are more effective in liquid flow applications, but they can sometimes be used in condensate systems.

Choosing the right bronze check valve size is an important step in making sure that the device will function efficiently. Oversized check valves force the unnecessary opening and closing of the valve repeatedly. Undersized check valves lead to extreme drop of pressure across the valve, which can prevent flow altogether. The correct size for bronze check valves depends heavily on the size of the pipework.