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Type O and OA Diaphragms

General Description

Type O Diaphragm


Type O Diaphragm

This type of diaphragm has no flange. An O-ring is molded to the bottom of the sidewall. Unlike the other types of diaphragms, the Type O is put into convolution by folding the sidewall back onto itself. The bead is then squeezed into a groove machined into the bonnet half of the hardware. This type enables the greatest reduction in hardware diameter, while keeping a full stroke potential.

Type OA Diaphragm


Type OA Diaphragm

This diaphragm type is second generation to the Type O. It fits into identical hardware. It differs from the Type O in that its sidewall attaches to the inside diameter of the O-ring and the fabric is on the outside, requiring the head corner radius to be inverted for installation. The Type OA tends to be easier to install but basically the difference is a personal preference.

 

Dimensions and Tolerances


Type O and OA Figure 1

Inches mm Inches mm Inches mm
Cylinder Diameter

1.00-2.50


25-64


2.51-4.00


64-102


4.01-8.00


102 & up

Bead Diameter
.121


3.07


.151


3.84


2.42


6.15

Convolution Width
.094


2.39


.156


3.96


2.50


6.35

Flash Projection
.020 x .020 Max.


0.51 x .0.51 Max.


.030 x .030 Max.


0.76 x 0.76 Max.


.040 x .040 Max.


1.02 x 1.02 Max.

Wall Gauge
.017


0.43


.024


0.61


.035


0.89

Piston Radius
.063


1.60


.094


2.39


.125


3.18

Piston Diameter
Cyl. Diam. less .188


Cyl. Diam. less 4.78


Cyl. Diam. less .313


Cyl. Diam. less 7.95


Cyl. Diam. less .500


Cyl. Diam. less 12.70

Flange Radius
.032


.81


.047


1.19


.063


1.60

 

Hardware Design


Type O and OA Figure 2


Cylinder Diameter

Bead Groove Width = W

Bead Groove Height = H

Flange & Piston Corner Radii =
R1 & R2

Lip Radius = R3

Lip Height = L
(Inches) (mm) (Inches) (mm) (Inches) (mm) (Inches) (mm) (Inches) (mm) (Inches) (mm)

1.00-2.50


25-64


.125


3.18


.096


2.43


.063


1.60


.025


0.63


.100


2.54


2.51-4.00


64-102


.156


3.96


.122


3.10


.094


2.39


.032


0.81


.130


3.30


4.01-8.00


102-205


.250


6.35


.196


4.98


.125


3.18


.045


1.14


.204


5.18


8.01 and up


205 and up


.250


6.35


.196


4.98


.125


3.18


.045


1.14


.190


4.83

 

Available Sizes


Dia•Com
Part No.
Cylinder
Diameter
Piston
Diameter
Height
Gauge
Approx.
Convolution
Width
Effective
Pressure
Area
Maximum
Half-Stroke
(Inches) (mm) (Inches) (mm) (Inches) (mm) (Inches) (mm) (Inches) (mm) (Inches) * (Inches) (mm)

O-137-87


1.37


35


1.19


30


0.87


22


.017


0.43


.090


2.3


1.29


8.3


0.52


13.2


O-150-62


1.50


38


1.31


33


0.62


16


.017


0.43


.095


2.4


1.55


10.0


0.29


7.4


O-150-94


1.50


38


1.31


33


0.94


24


.017


0.43


.095


2.4


1.55


10.0


0.61


15.5


O-175-144


1.75


44


1.56


40


1.44


37


.017


0.43


.095


2.4


2.15


13.9


1.13


28.7


O-180-144


1.80


46


1.38


35


1.44


37


.025


0.64


.210


5.3


1.98


12.8


0.80


20.3


O-187-150


1.87


47


1.69


43


1.50


38


.017


0.43


.090


2.3


2.49


16.0


1.15


29.2


O-200-162


2.00


51


1.81


46


1.62


41


.017


0.43


.095


2.4


2.85


18.4


1.27


32.3


O-200-200


2.00


51


1.87


47


2.00


51


.017


0.43


.065


1.7


2.94


19.0


1.64


41.7


O-250-200


2.50


64


2.31


59


2.00


51


.017


0.43


.095


2.4


4.54


29.3


1.65


41.9


O-275-112


2.75


70


2.44


62


1.12


28


.024


0.61


.155


3.9


5.29


34.1


0.57


14.5


O-400-238


4.00


102


3.69


94


2.38


60


.035


0.89


.155


3.9


11.61


74.9


1.83


46.5


O-500-312


5.00


127


4.50


114


3.12


79


.035


0.89


.250


6.4


17.71


114.3


2.28


57.9


O-600-440


6.00


152


5.50


140


4.40


112


.035


0.89


.250


6.4


25.95


167.4


3.56


90.4



OA-75-85


0.75


19


0.55


14


0.85


22


.017


0.43


.100


2.5


0.33


2.1


0.46


11.7


OA-106-145


1.06


27


0.94


24


1.45


37


.017


0.43


.060


1.5


0.79


5.1


1.12


28.4


OA-112-69


1.12


28


0.94


24


0.69


18


.017


0.43


.090


2.3


0.83


5.4


0.33


8.4


OA-137-53


1.37


35


1.19


30


0.53


13


.017


0.43


.090


2.3


1.29


8.3


0.17


4.3


OA-200-58


2.00


51


1.81


46


0.58


15


.017


0.43


.095


2.4


2.85


18.4


0.20


5.1


OA-283-160


2.83


722


2.52


64


1.60


41


.024


0.61


.155


3.9


5.62


36.2


1.09


27.7


OA-462-350


4.62


117


4.00


102


3.50


89


.035


0.89


.310


7.9


14.58


94.1


2.86


72.6


OA-475-225


4.75


121


4.25


108


2.25


57


.017


0.43


.250


6.4


15.90


102.6


1.22


31.0


*Metric effective pressure area shown in square centimeters.

 

 

 

 

 

Dia•Com is a leading international provider of innovative, cost-effective molded diaphragm solutions critical to the operation of essential systems and equipment in industrial, automotive, aerospace, medical instrumentation, and food and water processing applications. The company's reputation for excellence is based on superior quality in the design, manufacture and application of its high-performance, state-of-the-art, fabric-reinforced and homogeneous elastomeric diaphragm seals.

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