Screwed End valves or Threaded End valves means the valves have threads on the ends. These type of end connections are suitable for low pressure piping systems. These are affordable and ensure quick assembly to the users, without any difficulty. In some cases, these connections may be welded around the joint when they are assembled. However, this is not much in practice as it may cause some troubles in the efficient use of these types of valve end connections.

Threaded connections are very common. They provide a compact and streamlined connection between the valve and pipe.The valve typically has female threaded end connections, into which the male threaded pipe fits. There are valves with male threaded connections as well, and even valves with one female end and one male end. Threaded connections must adhere to a standard in order to be useful in industry, such as NPT, BSPT etc. There are a few different standards that exist. The valve and pipe must both be created using the same standard in order for them to make a proper connection.

There are standards for straight threads and some for tapered. Tapered threads provide a fluid tight seal without the use of a soft seal like an o-ring or flat washer. Straight threads do require a soft seal that gets compressed between the valve and pipe, hose, or fitting that they are being connected to.

Screw Butterfly Valve

Screw Threaded Gate Valve

Threaded Check Valve