Why can’t wafer-type check valves be connected directly to the pipe connections of equipment or other valves?

As the title suggests, both swing and lift types are suitable, while wafer type is not. A wafer check valve is similar to a wafer butterfly valve; the reason it isn’t suitable is that when the valve disc is open to its maximum extent, it exceeds the length of the two flanges. If it is connected directly to the flanges or pipe ends of other valves, the valve disc will come into contact with those flange ends If there is a concern about hitting other flange connections, then how are wafer-type valves used in other locations? Is this problem still present if the valve is away from the device? It’s also because clamped valves are relatively short in length; when connected directly to pipe ends or other valves, there isn’t enough space for the bolts to be installed The issue with the installation position can be resolved by using double-headed fully threaded bolts, or by using single-headed bolts in the opposite direction with the nut facing the equipment. Personally, I wonder if the force required to tighten clamp-type valves is greater than that needed when using flange connections, and whether this could cause damage to the equipment

It makes sense not to connect directly to the equipment, but the reason is not a connection issue; rather, since check valves are prone to failure and need to be replaced frequently, a valve is required to cut off the flow. There are also many types of wafer check valves, including those with spring operation and swing-type designs. Whether it can be connected to a valve can be understood by simply looking at the principle of a check valve. At least, it’s no problem for the inlet of the wedge-type check valve to be directly connected to other valves. Whether a straight pipe section is needed at the outlet depends, on the one hand, on the type of check valve, and on the other hand, on whether the clamp bolts (columns) can be installed; these clamp bolts are much longer than ordinary flange connection bolts. As for the bolt connection strength, it has nothing to do with the clamp.

"As the title suggests, both swing and lift types are suitable, while wafer type is not. A wafer check valve is similar to a wafer butterfly valve; the reason it isn’t suitable is that when the valve disc is open to its maximum extent, it exceeds the length of the two flanges. If it is connected directly to the flanges or pipe ends of other valves, the valve disc will come into contact with those flange ends " This is the most fundamental reason.