Wafer Check valve

function of the wafer check valve

Wafer check valve has been developed to overcome the limitations of the size or the costly expense, which are caused by the bulky type of the previous lift and swing check valve. Generally speaking, check valves are those that are designed to fit between a set of flanges, aiming to control the flow in one direction only. And the wafer check valve is becoming the preferred type of check valve for most applications as a result of the compact design and relatively low cost. Actually, there are many specified versions of the wafer check valve in order to meet the various industrial requirements. The general applications are listed in the following.

Firstly, the wafer check valve is used to prevent boiler water being forced back along the feedline into the storage tank when the feedpump stops running. Furthermore, the type with a heavy-duty spring and a soft seat can be fitted in the boiler feedline to prevent flow under gravity into the boiler when the feedpump is shut off.

Then, the particular ones with steam traps discharging to atmosphere are generally inserted after a steam trap to prevent back flow of condensate flooding the steam space. And some other types should be installed after each pump to prevent reverse flow through the pump when it has been shut off.

And some are able to be applied under the vacuum conditions, acting as breakers by fitting themselves in reverse. And the relatively blending type is fitted in each supply line to prevent reverse flow along the different lines which will lead to contamination. For example, the valve itself is able to be employed within the mixing of hot and cold water to provide hot water.

Whatever, there are many other applications of the wafer check valve. In words, they are designed elaborately to meet the various specifications and to do favors to the industrial development.

swing type wafer check valve

The wafer check valve of the swing type is similar to other types of the check valve. This kind of valve is used to guide the forward flow resulting from the fluid pressure itself. And this kind of the wafer valve has taken advantage of the standard swing check valve to make some further improvements.

The swing type wafer check valve does not have the full-bodied arrangement. As a result, when the valve opens, the flap is forced into the top of the pipeline. Then, the pressure drop across the valve is further increased because the diameter of the flap is smaller than that of the pipeline.

The swing type wafer check valve is generally used mainly on larger pipeline sizes, typically above DN125. The general applications of the swing type wafer check valve mainly depend on the necessity to enable the significant the pressure drop. Besides, the swing type check valve is able to be significant at cost savings through it on larger sizes, due to the small amount of material required for the construction of the valve.