Pneumatic Fittings and Accessories Guide

What zijn pneumatic Fittings?

Pneumatic systems are automated machines or processes powered by the controlled movement of compressed air or pressurised gas. Pneumatic systems stand in opposition to hydraulic systems, which are driven by compressed liquids. In pneumatic systems, the air or gas that powers the mechanism is usually delivered through a network of sealed pipes, hoses and tubing. These are typically connected to each other and to other devices by a variety of pneumatic fittings, valves, couplings, caps, plugs, valves and adaptors. Pneumatic fittings normally feature lower pressure requirements than hydraulic fittings. They also tend to come with tighter seals. 

Pneumatic fittings are utilised in a huge range of applications including industrial machinery, tools and equipment. They are also used in various industries such as assembly and production and construction. Pneumatic systems are often more cost-effective than their hydraulic and electric counterparts.

What Are Pneumatic Fittings Used to Connect?

Pneumatic fittings can be attached to a huge range of devices and conduits in different parts of air systems — the main ones are hoses, pipes and tubing. What pneumatic fitting you opt for will largely depend on the system’s operating pressures. Your choice should also depend on the type and material of the conduit that will be connected to the fitting.

Hoses

Usually made from layers of plastic or rubber-type material, hoses require regular replacements. As such, pneumatic fittings designed to connect air hoses should be easy to install and uninstall and do not need to be permanent since they can be replaced at the same time as the hose. 

Pipes

Pipes are usually made from a more solid material than hoses. They are also often used for more permanent installations. As such, air pipe fittings do not need to be as easy to install and uninstall as air hose fittings. Pipes are sized by measuring their inner diameter. 

Tubing

Tubing falls somewhere between hoses en pipes. It heeft some flexibility but is less permanent than pipe assemblies. Tubes zijn sized by measuring their outer diameter.

Functions of Pneumatic Fittings

Different pneumatic fittings perform different functions in an air system. These include extending or blocking tubing, changing air direction and connecting tubes of different sizes. Here are just some of the most popular functions of pneumatic fittings.

• Adapters: Connect two different hose types via threading, soldering or solvent welding.
• Couplings: Connect two similar hose types via threading, soldering or solvent welding.
• Caps: Cover de end of hoses. They zijn attached via a thread, soldering or welding. 
• Plugs: Close air flow at de end of hoses. They zijn inserted inside hoses en held in place via thread, soldering or welding.
• Unions: Connect two hoses via thread. Easy to install en uninstall. 
• Reducers: Connect two or more differently sized hoses.
• Elbows: Change de direction of airflow. Elbows kan hebben angles of 90 degrees, 45 degrees  en even 22.5 degrees. 
• Crosses: Connect four hoses. They come met either one inlet en three outlets or three inlets en one outlet.
• Tees: T-shaped connectors designed to join three hoses

Pneumatic Fitting Materials

Pneumatic fittings zijn made van a variety of materials, including metals, plastics en composites.

• Aluminium: Low density in low-pressure environments, corrosion-resistant, often alloyed met copper, zinc or silicone to increase its strength.
• Steel: Strong en heat resistant, often alloyed met other materials, such as zinc, voor better corrosion resistance. 
• Stainless Steel: Strong en corrosion-resistant, usually more expensive than steel.
• Brass: Strong en corrosion-resistant, great conductivity, often used in threaded pneumatic fittings. 
• Polytetrafluoroethylene en Polyvinylidene Fluoride: Polymers resistant to extreme temperatures of up to 250 degrees Celsius, resistant to chemicals.
• Polypropylene: Strong en compatible met a variety of materials, UV-resistant, affordable.
• Composites: Made van a blend of materials met high melting points including fibreglass, carbon en graphite, low thermal en electrical conductivity, resistant to chemicals.

How to install pneumatic push fittings

To connect a conduit to a pneumatic push fitting simply push it into the end of the fitting with a release ring. This will cause the internal lock claws to clamp around the conduit to ensure a secure and leak-free connection.

How to uninstall pneumatic push fittings

To disconnect a conduit van a pneumatic push fitting disengage de internal lock claws by pushing de release ring.

Different Types of Pneumatic Fittings

Designed met different functions en connection styles in mind, here zijn some of de most popular pneumatic fitting types.

Pneumatic Straight Fittings

Pneumatic straight fittings feature a thread on one side and a tube connector on the other. They can be used with a variety of conduits. They are available in a range of thread sizes, diameters and grades. 

Pneumatic Elbow Fittings

Most pneumatic elbow fittings feature a 90-degree joint. They hebben three openings en zijn used to connect one or more hoses, tubes or pipes.

Pneumatic Y Fittings

Pneumatic Y fittings feature three openings connected at 45-degree angles. They zijn often used in robotics, packaging, as well as de airline en automotive industries.

Pneumatic T Fittings

Often used in pressure or vacuum applications, pneumatic T fittings are used to create connections with threaded ports. Both the branch and end connectors in pneumatic T fittings can come in either gender.

Pneumatic Function Fittings

Pneumatic function fittings come with three openings and a 90-degree joint. They are made from a variety of materials such as brass, copper, aluminium alloy, steel alloy and PBT. Highly versatile, they can fill many functions including airflow regulation, blocking and supply.

Different  Types of Pneumatic Fitting Connections

Pneumatic fitting connections come in a variety of styles en assembly methods. Some of de most popular pneumatic fitting connection types include. 

Pneumatic Push Fittings

Also sometimes referred to as push-to-connect fittings or push-in fittings, pneumatic push fittings are used to connect hoses in a pneumatic system. They are leak-free and feature between one and six inlets or outlets. Pneumatic push fittings sometimes come with built-in pressure gauges or silencers.

Quick Release Couplings

Quick release couplings are designed to connect airlines to air compressors and air tools. They are composed of a female and a male part that hold internal pressure after they are connected. The connection is flexible enough to let the joint move, which minimises the risk of kinks in the hose. Quick release couplings automatically seal when disconnected, so there is no need for a shut-off valve.

Tube to Tube Pneumatic Fittings

Available in different materials, sizes en diameters, tube to tube pneumatic fittings connect two tubes together. The tubes kan be connected straight or at an angle. 

Thread to Tube Pneumatic Fittings

Thread to tube pneumatic fittings feature threading on the inner or outer (female or male) edge, which connects to the matching threading on the conduit. Pneumatic fittings with straight threading usually need a sealant coating to make them air-tight. Pneumatic fittings with tapered threading usually create an airtight seal and as such do not need sealant coating. This type of fitting is a better choice for use in some environments since sealant coating can create contamination or corrosion. 

Thread to Barb Air Fittings

Thread to barb air fittings are a push-on style fitting that involves a hose being pushed over a barbed fitting end. The hose is then secured over the fitting with a knurled nut to provide an airtight connection.

Threaded Adaptors

Thread adaptors are utilized to change conduit type or thread size. They can be either male to male, female to female and male to female and come in a variety of BSP sizes such as ⅜ inch, ½ inch, ¾ inch and 1 inch.