Help you choose pneumatic air fittings from China – Untapped tips

Help you choose pneumatic air fittings from China – Untapped tips

As automation system and air tools are used widely, pneumatic air fittings have awide application. But still a lot of people are not sure how to choose right pneumaticair fittings. Right pneumatic air fittings means good fitness, good price, good qualityin some sense. Let’s see what is called pneumatic air fittings firstly.

What is pneumatic air fittings

Pneumatic air fittings are used for carrying compressed air, connect differentpneumatic systems. Compared to hydraulic fittings, pneumatic air fittings aretypically characterized by tighter seals and lower pressure requirements. Aspneumatic systems have much variety and complexity, it request pneumatic fittinghas different shapes and different purpose.

Advantage of pneumatic air fittings

Hundreds of tubes size and thread combination to meet with differentdemand.

Low cost, easy to change and maintain Some series of fittings can be used for water.

Types of pneumatic air fittings

When choose a pneumatic air fittings, below factors need to be considered:

• Working pressure • Working environment • Working temperature • Fluid type ( air, water, oil, etc) • Fitting material (plastic, brass, aluminum, zinc, stainless steel) • Shape (straight, elbow, etc.) • Size (tube size and thread size) • Approvals certificate (for example: Department of Transportation,

Underwriters Laboratory, FDA, CE, ROHS)

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Plastic push in fitting

Plastic push in fitting is the most used one of pneumatic fittings. It is designed forPolyurethane and Nylon tubing, can be used for a regular working environment,mainly fluid is air.

Features:

1. Fluid type: Air ( No other gases or liquids ).2. Working pressure: 0-150psi3. Negative pressure: -29.5 in Hg4. Working pressure: 0-60 degree5. Material as below

Body material: PBT; Release sleeve: POM; Sealing: NBR; Collar: Nickle-plated Zinc; Lock claw: SUS; Metal body: Nickle-plated Brass; Thread: Pre-coated sealant; O Ring: NBR

6. Size: Pipe size has metric and inch two typies;

The thread mainly includes BSPP, BSPT, NPT(1/8″, 1/4″, 1/2″, 3/8″, 1″)Advantage: Plastic is light and able to withstand a significant amount of pressure.Moreover, plastic fittings are very affordable.Disadvantage: Can’t understand high pressure and high temperature.

TIPS

When you choose plastic push in fittings, please do not consider prices only. Please ask supplierhow to test, certificate and which customer they have.

Some supplier also would like to accept small orders, this type is very common and have somestock usually.

Now many manufacturers are developing new series to compete with market. If you have interst,please inquiry new series to win your profit.

Brass push in fitting

Brass push in fittings is brass pneumatic fittings. They are generally made fromnickel-plated brass, though some composite fittings made of glass-reinforced nylonare available as well. Brass push in fittings are easy to disconnect and reconnect,making them excellent for any environment where frequent changes are necessary.They are usable with nylon, polyurethane, PE and some less common tube types.

Features:

1. Fluid: Compressed air2. Working pressure: -0.8-15bar3. Application tube: PU, PE, PA tube.4. Size: Pipe size has metric and inch two types, thread side has BSPP, BSPT, NPTthree types. (1/8″, 1/4″, 1/2″, 3/8″,1″)5. Working pressure: -10-60 degree

Material: all brass with NBR seals or Viton seals.

Advantage: It has a easy structure, can be used for high temperature environment.They are more durable and cost effective.Disadvantage: It’s not allowed in a corrosive environment.

TIPS

Brass push in fittings usually have two structures, one is similar with plastic push in fittings, wecalled B structure . The other is only brass body and brass collect and O-ring, we called Astructure. A structure is very simple, can burden more pressure, but easy to hurt the tubesurface. B structure has a lower pressure, but it is more durable than plastic fittings.

For seals, regular seal is NBR. If you have high temperature requirement, please request vitonseals.

Brass push in fitting

Stainless steel push-in fittings are also applied in pneumatic field. So it is also calledstainless steel pneumatic fittings. They allow fast circuit assembly for conveyingcompressed air, gas or liquids at a wide range of pressures and temperatures.Connection and disconnection is immediate and manual.Usually the material isSS316, so it allows corrosive gas and liquid to through.The stainless steel collet design ensures superior clamping with various types of tubesuch as nylon, polyethylene and polyurethane. Used in pneumatic applications likerobotics, conveyer systems, and any system requiring the transfer of compressed airor liquids compatible with the materials of manufacture.

Features:

1. Operating Pressure: -0.99 bar~15 bar2. Operating Temperature: -20~200 degree3. Application: Air, vacuum, steam, drinking water and food4. Recommended Tubing Material: PA, PU, PTFE, FEP, PE TUBE5. Size: Pipe size has metric and inch two types, thread side has BSPP, BSPT, NPTthree types. (1/8″, 1/4″, 1/2″, 3/8″, 1″)

6. Types: Straight, Elbow, Tee, X, Y,7. Applation: NYLON, PU, PTFE, FEP, PE TUBE, etc.8. The internal seal is a factor which limit the environmental temperature, VITON,PTFE seal are available.

Material is all SS316, except for claws SS302.

Advantage: The materials ensure Anti-corrosion highly ,all of them are made fromSUS316 expect the seal ring. High temperature and high pressure andcorrosive environment are available.Disadvantage: As it has a good performance, the only one disadvantage is the highof the price.

TIPS

Stainless steel push in fittings structure is similar to plastic push in fittings. It is used for harshenvironment.

Cost is quite expensive, but it is worthy to invest.

Please do not consider the price, just consider the quality. You need samples to test and check.

Push on fitting

Pneumatic Push on fitting is also named rapid screw fitting, it’s used for pneumaticindustry widely.Push on fitting is used for pneumatic soft tube, it can grasp the pipe steadily.The swivel part can avoid the twist of the pipe, so it’s more steady than push infittings.

Features

1. No special tools or clamps are required for installation.2. Assemblies can be done in seconds.

3. Push-On fittings are reusable. Just replace the hose with no special tools.4. Faster and easier maintenance.5. Fluid Type: compressed air (For other fluid, please contact us).6. Working Pressure: -0.8~15 bar.7. Application Tube: PU, PE, PA tubes.8. Working Temperature: -10~60 degree9. Size: Thread side has BSPT, BSPP, NPT and metric size are available; hose diameterhasmillimeter and inch two types. (1/8″, 1/4″, 1/2″, 3/8″, 3/4″, 1″)Advantage: The nut can grasp the hose steadily, it can work in a high temperatureandhigh pressure environment. This fitting is more reliable than other fittings.Disadvantage: Has no quick connect function, it need a wrench to tighten the nut.

TIPS

Before choose, a features of it need to know. Usually a soft tube is more suitable for this fitting,because the screw nut can grasp the hose tightly. Then consider the working environment, it canbe used for a high pressure, if you use them for a normal working environment, you can chooseother type fitting to save cost.

Structure is very simple, cost is cheaper than brass push in fittings.

Compression fitting

A pneumatic compression fitting relies on a nut or other similar device beingscrewed down over a ferrule, compressing it. The compression of the ferrule causesit to bow inward, compressing the tube, the fitting, and the receiving fitting togetherto form a tight seal. Compression fittings are appropriate for copper, aluminum, andplastic tubes, and are themselves usually made of brass.

Features:1. No flaring or soldering needed.

2. Tube compatibility: Available in inch dimension only, Copper, Aluminum,Thermoplastic.3. Thread availability: Male pipe , Female pipe.4. Body material: Brass.5. Used for high pressure environment.6. Working pressure and temperature depend on tube pressure.7. Fluid Type: water, air, oil, diesel, and other fluids.Advantage:

Nylon tube and metal tube are available, fluid types are diversified, and hasa wildely usage in different environment.Disadvantage: The price is higher than normal fiting.

TIPS

Pneumatic compression fittings are used to connect copper tubes. High cost but quality assured.

For rigid nylon tubes, we advise you buy internal tubes to fix.

Brass connector

Brass connector is a joint to connect different pneumatic fittings, it’s moreconvenient to used in different industrial fields. Union, straight, elbow ,etc shapesare available. And different environment has same reliable performance.

Features:

1. Fluid type: Air, water, oil, diesel and other liquids.2. Working temperature: -40-120 degree3. Working pressure: 0-50bar4. Size: Threas has BSPP, BSPT, NPT and metric size are available. (1/8″, 1/4″, 1/2″,3/8″, 3/4″, 1″)5. Material: Regular material is brass Nickle-plated, steel and stainless steel are

available. Surface treatment has chromeplated, zinc plated and nickle plated.6. Shape: Straight, elbow, “x”, “y”, etc.Advantage: Structure is simple, no additional sealants ,easy to fit different fittings, itcan endure a high pressure andtemperature environmetn.Disadvantage: Not convenient to tighten the joint, sometimes need to notice theleak.

TIPS

Choose a brass connector, please make sure you tell supplier the thread standard you need, it isusually BSPT, BSPP, NPT thread.

Meanwhile, low prices always means low weight. If you care about quality, please let suppliersend you the weight and drawing. If you have big quantity, they also can make the fittings as thedrawing.

Pneumatic Quick Couping

Pneumatic quick coupling is A very important partner for air tools and spiral tubes.According to different market, they are usually divided into Europe series, USA series,Asia series. Three famous brands can stands for three markets.

Milton brand for USA market

Rectus brand for Europe market

Nitto brand for Asia market

Now a lot of China suppliers can replace the brand with good quality. But due toHIGH competitions, some suppliers make it lower cost by reducing weight andchanging material. If you need high quality with large volume, please make sure youtell your supplier your detailed requirements, like fluid, material, etc.

Features:

1. Fluid type: Air2. Working temperature: 0-120 degree3. Working pressure: 0-20bar4. Size: Threas has BSPP, BSPT, NPT and metric size are available. (1/8″, 1/4″, 3/8″,1/2″)5. Material: For different series, they have different material. Regular material issteel, brass, aluminum.6. Shape: Straight.Advantage: connect and disconnect fast.Disadvantage: Only for air. Some series also can used for water.

TIPS

Please choose quick coupling according to plug profile. Please refer to our XHnotion catalogue.

Regular material is steel nickel plated, O-ring is NBR. If you have higher requirements for material,please do make a detailed requirement list.

Quick coupling is kind of fast valve. So please do not buy too cheap goods, please choose famousbrand like XHnotion.

Push button safety pneumatic coupling

Push button safety air coupling adds ease of operation and safety in use. Availablecomposite bodies make for better handling and reduce incidental damage to people.Double click to engage properly. First click locks coupler and plug. The second clickengages the air pressure. To disconnect push button twice. First push relievespressure and second push allows plug and coupler to be disengaged.

Features:

1. Fluid type: Air2. Working temperature: 0-60 degree3. Working pressure: 0-15bar4. Size: Threas has BSPP, BSPT, NPT and metric size are available. (1/8″, 1/4″, 3/8″,1/2″)5. Material: steel, brass, aluminum.6. Shape: Straight.Advantage: connect and disconnect fast.Disadvantage: Only for air.

TIPS

Push button safety quick coupling is more and more popular in Europe and Americamarket. But costs from local suppliers are quite high.

This structure request high technique and cost to finish. Most China’s factory can notmake this coupling.

Now XHnotion is developing this structure. We hope to win the market by lowerprice and stable quality.