Briefing of Quick connect fitting

For hoses and pipes a quick-connect fitting (also known as a push-fit fitting) is a type of fitting used to provide quick, intermittent connections in gas or liquid transfer lines. Manually operated, quick-connect fittings replace threaded or flanged connections, requiring a wrench. When equipped with a self-sealing valve, the quick connect fitting will automatically contain any fluid in the line when disconnected.

Uses

There is a wide variety of quick connect fittings.They are used for kilometers underwater, drilling operations, outer space for docking spacecraft, pneumatic, plumbing, heating, electrical and fire suppression applications.Quick connect fittings are designed to be easier to apply than traditional fittings, requiring only the teeth of the pipe to be firmly pushed together to securely lock the fitting.When a reaction force is applied to the teeth, the teeth are forced deeper into the pipe, preventing them from separating from the pipe. O-rings provide a watertight and airtight seal.

Push-to-pull compression fittings

A push-to-pull, push-to-connect, push-in, push-fit or instant fitting is an easily removable compression fitting or quick connect fitting that allows connection of an air (or water) line, nominally without the use of tools (Tools are usually still required to cut the tube and disassemble).These fittings work similar to how regular compression fittings work, but use a resilient O-ring (usually EPDM) to seal and a clamp ring (usually stainless steel) to hold the tube in place.The main advantages of this technology over traditional soldered copper or glued plastics are that the fittings can be easily disassembled and reused, assembly is fast and can be assembled when wet, and the joints can still be rotated after connection.These fittings can be used on a variety of pipes in many sizes for a variety of purposes. So far this article has only covered domestic plumbing.

Usage

Push-fit connections are easier to make than soldered or glued connections, but still require some knowledge to get them right.Defects that can cause a joint to fail include not pushing the pipe far enough in, the round end of the pipe not being smooth, the surface of the pipe under the O-ring being too rough, and debris in the mechanism.Deburring the end of the pipe is critical to avoid damaging the O-ring during insertion, and the surface of the pipe beneath the ring must be smooth for an adequate seal.The pipe end should be square so that it will sit against the stop in the fitting and not cause turbulence in the water flow.It's easy to push the tubing into the snap ring or O-ring instead of all the way to the stop.This is the most common problem with improper use of these connectors.Accessory designers have come up with a range of ways to try and show users that they've pushed it far enough.The pipe is usually marked to show how deep it is inserted, so if you cut at one mark and insert the pipe to the next mark you will get a good connection.For example, Hepworth pipes have always had this feature.Pre-insertion marking is recommended on pipes that are not pre-marked, such as copper pipe. Hepworth offers an insert with a raised end.When fully inserted, it lines up with a protrusion in the fitting, so it "rumbles" if you rotate the pipe in the fitting.Manufacturers of non-removable PEX/PERT tubing provide a colored indicator ring that is pushed into place to be seen when fully inserted, or the spring clip separator is pushed out by the tubing so it will "snap".