Model 900771 3.25" X 3" - 3/8 NPT Female Bellows Vacuum Cups

EXAIR vacuum cups are vinyl and available in round, oval or bellows style. Thread sizes include 1/8 NPT, 1/4 NPT, 3/8 NPT and 1/2
Model
900771
$50.00

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EXAIR vacuum cups are vinyl and available in round, oval or bellows style. Thread sizes include 1/8 NPT, 1/4 NPT, 3/8 NPT and 1/2 NPT. The Durometer rating (used to indicate the flexibility and stiffness of the cup) is A50. Temperature range is 32°F to 125°F (0°C to 52°C).

E-Vac Accessories

Accessories Needed To Build Your Vacuum System

EXAIR offers a variety of mufflers, tubing, check valves, and fittings that make it easy to build a vacuum system best suited to your vacuum application. In addition to these E-Vac vacuum generator accessories, there are other items that can help with the preparation and control of the compressed air.

When using E-Vac vacuum generators, it is important to use a source of clean, dry compressed air that will keep them operating at their peak performance. Automatic drain filter separators to keep the compressed air free of contaminants and moisture are recommended. Oil removal filters that remove oil particulate that is common to many compressed air systems are available. Pressure regulators, shutoff valves, compressed air hose, fittings, and solenoid valves (to electrically turn the compressed air on and off) are available as well.

Mufflers

Optional silencing mufflers are available that permit maximum exhaust of the E-Vac unit so cycle speed is not reduced. The Standard Muffler (for use with In-Line E-Vacs only) has a closed end and is suitable for applications that are free of dust and debris. The Straight Through Muffler is recommended where particulate is present since it will not accumulate debris that can erode performance. Straight Through Mufflers offer the best sound level reduction (up to 26 dBA).

Fittings and Tubing

The vacuum port of the E-Vac has an NPT thread (a vacuum cup can be threaded directly into it). For vacuum cups that are remotely located, push-in connector fittings (most have global threads for use with NPT and BSP) can be installed on the E-Vac and the vacuum cup. Polyurethane vacuum tubing is available (10', 20', 30', 40' and 50' lengths) to connect them. For best performance, the length of the tubing should be minimized to achieve the best attach and release times.

Check Valve

A vacuum check valve is available to hold the vacuum in case of compressed air loss. It is designed for high flow so it doesn’t restrict airflow or slow the vacuum operation. Maximum vacuum can still be achieved without affecting the performance. E-Vac vacuum generators that are used without a check valve will release the load if there is a significant drop in compressed air pressure or the supply of compressed air is lost.

 Standard Mufflers
 ModelDescriptionThread
 900800Standard Muffler1/4 NPTM
 900801Standard Muffler3/8 NPTM
 900802Standard Muffler1/2 NPTM
 Straight-Through Mufflers
 ModelDescriptionThread
 890001Straight-Through Muffler1/4 MNPS
 890002Straight-Through Muffler3/8 MNPS
 890003Straight-Through Muffler1/2 MNPS
 890004Straight-Through Muffler3/4 MNPS
 890005Straight-Through Muffler1 MNPS
 Check Valves
 ModelDescriptionThread
 900804Check Valve1/4 NPTF
 900805Check Valve3/8 NPTF
 900806Check Valve1/2 NPTF
 Vacuum Gauge
 ModelDescriptionThread
 900811Vacuum Gauge0-30" Hg
 Push-In Connector
 ModelDescription
 9007731/4 Tube X 1/8 NPTF
 9007741/4 Tube X 1/8 Male Global Thread
 9007751/4 Tube X 1/4 Male Global Thread
 9007761/4 Tube X 3/8 Male Global Thread
 9007773/8 Tube X 1/8 Male Global Thread
 9007783/8 Tube X 1/4 Male Global Thread
 9007793/8 Tube X 3/8 Male Global Thread
 9007803/8 Tube X 1/2 Male Global Thread
 Push-In Swivel Elbow Connector
 ModelDescription
 9007811/4 Tube X 1/8 Male Global Thread
 9007821/4 Tube X 1/4 Male Global Thread
 9007831/4 Tube X 3/8 Male Global Thread
 9007843/8 Tube X 1/8 Male Global Thread
 9007853/8 Tube X 1/4 Male Global Thread
 9007863/8 Tube X 3/8 Male Global Thread
 9007873/8 Tube X 1/2 Male Global Thread
 Push-In Swivel Branch Tee Connector
 ModelDescription
 9007881/4 Tube X 1/8 Male Global Thread
 9007891/4 Tube X 1/4 Male Global Thread
 9007903/8 Tube X 1/4 Male Global Thread
 9007913/8 Tube X 3/8 Male Global Thread
 Push-In Bulkhead Connector
 ModelDescription
 900792Female Union - 1/4 Tube X 1/4 Tube
 900793Female Union - 3/8 Tube X 3/8 Tube
 900809Female Union - 1/4 Tube X 1/4 NPT
 900810Female Union - 3/8 Tube X 1/4 NPT
 Vacuum Tubing
 ModelDescription
 900795-101/4" Polyurethane Tubing - 10' (3m)
 900795-201/4" Polyurethane Tubing - 20' (6m)
 900795-301/4" Polyurethane Tubing - 30' (9m)
 900795-401/4" Polyurethane Tubing - 40' (12m)
 900795-501/4" Polyurethane Tubing - 50' (15m)
 900796-103/8" Polyurethane Tubing - 10' (3m)
 900796-203/8" Polyurethane Tubing - 20' (6m)
 900796-303/8" Polyurethane Tubing - 30' (9m)
 900796-403/8" Polyurethane Tubing - 40' (12m)
 link>900796-503/8" Polyurethane Tubing - 50' (15m)
 Mounting Clip
 ModelDescription
 900798Mounting Clip with Strap

Choosing A Suitable Vacuum Cup

Round Cups are best suited to smooth, flat surfaces. They will grip and release quickly. These cups hold their shape with extended use and grip well to vertical surfaces. Round cups with cleats are better at lifting heavy loads. Cups without cleats can be used for light lifting.

Oval Cups provide the most vacuum due to the larger surface area that contacts the part. They provide more vacuum power than round cups and are suited to lifting heavy loads. They are designed to handle flat rigid sheet materials like wood, glass, cardboard boxes and composites.

Bellows Cups are best suited to textured, uneven surfaces. The folds, called convolutions, provide a collapsible area that allows the cup to quickly compress when it touches the uneven surface. The attach and release time is greater due to the significant volume of the cup.

Vacuum Cup Selection

To select a vacuum cup for your application, you need to know:

  • The weight of item being lifted
  • If the item to be lifted is porous or non-porous
  • The safety factor

A safety factor of 2 is recommended when the vacuum cup is positioned horizontally.

A safety factor of 4 is recommended when the vacuum cup is positioned vertically.

Some companies or local codes may require a specific safety factor.

Using The Tables Below
Determine the weight of the part to be lifted. Multiply it by the safety factor of (2) when the cup will be positioned horizontally, or by (4) when positioned vertically.

Using the table below, look through the numbers highlighted in orange for the weight capacity per vacuum cup. Use enough vacuum cups to distribute the weight evenly for stable lifting and placement. The model number(s) for the vacuum cup(s) that can handle that weight are directly above (in that column) and are highlighted in blue. Details for each vacuum cup can be found on Vacuum Cup Dimensions.

To the left of the vacuum cup weight you’ve selected (in that same row) is the vacuum level highlighted in green that is needed. Performance data for the In-Line E-Vacs designed for specific vacuum levels can be found here. For loads that vary, Adjustable E-Vacs are the best choice (performance shown here).

Weight in lbs that a vacuum cup can hold at a given pressure
Vacuum Cup Models900762 900766900752 900767900763900764900753 900768900754 900769900765900755 900770900756 900757 900758 900771900759900760900761
Area of cup in20.40.81.01.51.83.14.44.98.314.219.628.3
Vacuum "Hg50.51.01.21.82.23.95.36.010.217.424.134.7
101.01.92.53.74.37.710.712.120.434.848.269.4
151.52.93.75.56.511.616.018.130.652.372.3104.2
202.13.94.97.48.715.421.424.140.769.796.4138.9
212.24.15.27.89.116.222.425.342.873.2101.3145.8
272.85.26.610.011.720.828.932.655.094.1130.2187.5
Weight in kilograms that a vacuum cup can hold at a given pressure
Vacuum Cup Models900762 900766900752 900767900763900764900753 900768900754 900769900765900755 900770900756 900757 900758 900771900759900760900761
Area of cup cm235610112028325492127182
Vacuum kPa170.20.40.60.81.01.72.42.74.67.910.915.7
340.50.91.11.72.03.54.85.59.215.821.931.5
510.71.31.72.53.05.27.38.213.923.732.847.2
680.91.72.23.43.97.09.710.918.531.643.763.0
711.01.82.33.54.17.310.211.519.433.245.966.1
911.32.43.04.55.39.413.114.825.042.759.185.0

Vacuum Cup Dimensions

EXAIR vacuum cups are vinyl. They are ideal for general purpose applications and provide excellent resistance to wear. The Durometer rating (used to indicate the flexibility and stiffness of the cup) is A50. Temperature range is 32°F to 125°F (0°C to 52°C).

  

Vacuum Cups - Small Round
Model ABCDEFGCleats
900752in1.001.120.250.810.450.171/4 FNPTNo
mm2528621114
900753in1.500.900.281.251.060.121/4 FNPTYes
mm3823732273
900754in2.001.000.251.561.310.181/4 FNPTYes
mm5125640335
900755in2.501.800.721.350.950.621/4 FNPTYes
mm644618342416
900756in3.501.100.560.980.510.371/4 FNPTNo
mm89281425139
*FNPT = NPT Female
Vacuum Cups - Large Round
Model ABCDEFGCleats
900757in3.251.150.502.231.870.373/8 FNPTYes
mm83291357479
900758in3.251.150.502.231.870.371/4 FNPTYes
mm83291357479
900759in4.251.180.502.752.430.373/8 FNPTYes
mm108301370629
900760in5.001.751.123.252.650.623/8 FNPTYes
mm1274428836716
900761in6.001.310.504.754.900.121/2 FNPTYes
mm15233131211243
*FNPT = NPT Female

  

Vacuum Cups - Oval
Model ABCDEFGHCleats
900762in1.001.060.120.810.760.090.501/8 MNPTNo
mm252732119213
900763in2.001.060.121.811.760.090.501/8 MNPTNo
mm512734645213
900764in1.731.030.211.351.210.090.871/8 MNPTYes
mm442653431222
900765in2.960.930.190.922.340.201.471/8 FNPTNo
mm752452359537
*FNPT = NPT Female
MNPT = NPT Male
Vacuum Cups - Bellows
Model ABCDEFGHCleats
900766in0.731.430.750.670.450.7931/4 FNPTNo
mm193619171120
900767in1.001.480.850.560.440.8541/8 FNPTNo
mm253822141122
900768in1.501.120.711.061.000.3111/4 FNPTYes
mm38281827258
900769in2.001.540.891.001.170.6811/4 FNPTYes
mm513923253017
900770in2.502.401.751.001.121.8021/4 FNPTNo
mm646144252846
900771in3.253.002.201.001.532.0023/8 FNPTNo
mm837656253951
*FNPT = NPT Female
MNPT = NPT Male
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