Drain valves are commonly used to remove fluid from storage tanks and systems in airplanes. Like all valves, they regulate the flow of fluid. Drain valves, however, are used specifically for draining fluid. While they are all used for the same purpose of draining fluid, they are available in different types. Here are five things to consider when choosing drain valves.
#1) Thread Size
You should consider the thread size when choosing drain valves. Most drain valves are designed with exterior threading, which allows them to connect to the interior threading of a hole. But the size of a drain valve’s thread may vary. Thread size is typically measured in National Pipe Tapered (NPT). You can refer to a drain valve’s NPT size to determine its thread size.
#2) Material
What material is the drain valve made of? Since you’ll be using them to drain fluids, you should choose drain valves made of a strong and corrosion-resistant material. Some of them are made of brass. Brass drain valves are an all-around great choice. They can withstand otherwise harsh fluids without degrading.
#3) Opening Mechanism
Something else to consider when choosing drain valves is the opening mechanism. In other words, how do you open them? Once installed, you’ll need to open the drain valves so that fluid will flow out of them. There are push-to-open drain valves that, as the name suggests, require nothing more than a slight push. Pushing them will release the fluid and, thus, drain the tank or system to which they are connected.
#4) Fluid Type
You should consider the fluid type when choosing drain valves. Different types of drain valves are designed for different types of fluids. Some of them are designed for fuel. Other drain valves are designed for oil. When shopping for drain valves, make sure they are compatible with the fluid type for which you intend to use them.
#5) Locking
There are locking drain valves available. As the name suggests, they feature a locking mechanism. You can lock in a particular position, such as the opened or closed position. Not all drain valves feature a locking mechanism. Whether you’re planning to use them for fuel, oil or any other fluid, though, you may want to look for this feature when choosing them.
In Conclusion
Choosing the right drain valves for an aircraft is important. It ensures safety, ease of maintenance and overall system performance. Just remember to consider the thread size, material, opening mechanism, fluid type and whether they their ability to lock.
