The fundamentals of Push-in Fitting and how it functions?
Push-in fittings also known as the push to connect fittings, function in connecting hoses/tubes in a compressed air system, assuring it to be leak-free. A pneumatic tube fitting has 1 – 6 inlet/outlet ports. Some may also have additional functionality such as an integrated pressure gauge or silencer.
How to install push-in fittings?
Push in the release ring-end to the fitting to the hose until it stops. By installing the fitting to the hose or tube, the internal lock claws will mechanically clamp around the hose for an instant and secure connection.
How to uninstall a push-in fitting?
Push the release ring internally towards the fitting to unlock the lock claws and pull back on the tubing to remove it. The reverse end could be another push to threaded male, connect fitting, or threaded female with an internal hex-type connection.
The threaded connection typically has a pre-applied thread lock coating. Hence, it’s important for the tube to be inserted fully for a proper seal.
Advantage of using push-in fitting
The greatest benefit of push-in fittings is the rapid release system that allows easy and simple installation by hand. One doesn’t need to use any tools and adhesives. It’s also easy to connect and disconnect airlines, that too at a low cost. Push-in fitting also comes in a wide variety of tube connections, tube sizes, and thread combinations match the desired outcome.
The disadvantage of using push-in fitting
Pneumatic tube fitting usually requires firmer tubing, as to repel being damaged by the internal claws. Therefore, it makes a firm tube less flexible which may not be suitable for symptoms where tubes/hoses will be routed around tight turns. So if you are looking for flexible tubing, the best would be, Polyethylene (PE) tube, Nylon tube, or Polyurethane (PU) tube. Push-in fitting is also best used for pneumatic (air) applications as well as water applications.
Normal & Unequal fittings
Normal push-in fittings usually use the same diameter across all outlet and inlet ports. As for unequal fittings, it has ports but with different diameters which is either larger or smaller, to connect with a different size tube or hose.
Pneumatic tube fittings must be combined into a system that needs connection hoses together. It’s easier to keep things simple to make sure no major pressure drop is induced.
One should also look into the operation pressure. Majority of the fittings have a maximum operating pressure of 1.0MPa, nonetheless the pressure must be kept below this level to certify safe operation. Push-in fittings also contains plastic parts and 0-rings which may be ineffective if it’s placed in a hot environment or by using hot air.
Push-in fittings are used in all types of compressed air systems, however are most frequently used in applications having pneumatic tools, cylinders and equipment. Push-in fittings can also be used for water applications too.
Connection points of Push-in Fitting
Plugs and cap fittings are one of the types of fittings with one connection port, hence it ends the flow of the air.
Two connection fittings have a single threaded (male or female) or a single push-in type port. The air flows to the outlet port from the inlet port.
The types of push in fitting with two connection are:
- Straight fitting
- Inner hex straight fitting
- Elbow fitting
- Union straight fitting
- Union elbow fitting
- Plug-in straight fitting
- Plug-in elbow fitting
Three connection fittings generally have two push-in type ports as well as one threaded push-in type port. This fitting can have any two inlets and one outlet to surge the pressure, or one inlet and two outlets to reduce the pressure and make two air flows.
The types of push in fitting with three connection are:
- Union Tee fitting
- Union Y fitting
Four to six connection points
Push-in fittings also have more connection points but not more than 6. Some of the fittings with more connections are triple “T”, double “Y” or cross fittings. These type of fittings are for special applications, nevertheless can help decrease overall fittings to feed 1 input line and to multiple outputs.
Here are the list of push-in fitting with more than 3 to 6 connection.
- Push-in orifice fitting
- Push-in check valve
- Push-in orifice check valve
- Needle valves with push-in fitting
- Push-in quick exhaust valve
- Push-in flow control valve
- Push-in shut-off hand valve
- Push-in mechanical valve
- Ball valves with push-in fitting
- 3/2-way ball valves with push-in fitting
- Pressure control valves with push-in fitting
- Pressure regulators with push-in fitting
- Pressure gauges with push-in fitting
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