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Type FC Diaphragm

General Description

Type Fc DiaphragmIn this style, the piston and the flange are molded on the same plane. The benefit of this style is that the handwork of forming the convolution is eliminated, which greatly reduces the assembly time. This would be of importance in high volume applications. The drawbacks to this type of diaphragm are: a built-in spring rate, due to the molded-in convolution, which must be considered during the design stage, and a limited stroke-to-bore ratio. To improve this ratio, an offset preconvoluted diaphragm can be designed (see FC Offset figure at bottom of page). In this shape, the piston head and flange are molded offset to each other, thereby putting all the additional stroke capabilities on one side of the convolution. This provides a longer stroking diaphragm which still maintains the assembly ease of a preconvoluted diaphragm.

Dimensions and Tolerances


Type FC Figure 1

Inches mm Inches mm Inches mm Inches mm Inches mm
Cylinder Diameter

.25-.99


6-25


1.00-2.50


2-64


2.51-4.00


64-102


4.01-8.00


102-205


8.01 & up


205 & up

Height
See available sizes table

Cylinder Diameter
Tolerances on Cylinder Diameter and Piston Diameter are ± 0.010" per inch (0.254 mm) of diameter but the tolerance will be no less than ± 0.010" (0.254 mm) or greater than ± 0.060" (1.52 mm)

Piston Diameter
Head & Flange Thickness
.015 ± .003


.038 ± 0.08


.017 ± .004


0.43 ± 0.10


.024 ± .004


0.61 ± 0.10


.035 ± .005


0.89 ± 0.13


.045 ± .007


1.14 ± 0.18

Wall Gauge
.015 ± .003


.038 ± 0.08


.017 ± .003


0.43 ± 0.08


.024 ± .004


0.61 ± 0.10


.035 ± .005


0.89 ± 0.13


.045 ± .007


1.14 ± 0.18

Piston & Flange Radius
.031


0.79


.063


1.60


.094


2.39


.125


3.15


.125


3.18

Flange Diameter
Cyl. Diam. ± .750


Cyl. Diam. ± 19.05


Cyl. Diam. ± 1.000


Cyl. Diam. ± 25.40


Cyl. Diam. ± 1.500


Cyl. Diam. + 38.10


Cyl. Diam. ± 2.000


Cyl. Diam. ± 50.80


Cyl. Diam. ± 2.000


Cyl. Diam. ± 50.80

 

Diaphragm Flange Diameter and Hole Trim Tolerance
Diameter Size Position
(Inches) (mm) (Inches) (mm) (Inches) (mm)

0-1.00


.0-25.40


± .010


0.254


.010


0.254


1.01-3.00


25.65-76.20


± .020


0.508


.020


0.508


over 3.01


76.45


± .030


0.762


.030


0.762

 

Angular Relationship of Holes: ± 1/2 Degree


Type FC Figure 2

 

Hole Spacing for Type FC Diaphragms


Type FC Figure 3

 

Perforations through the head or the flange should be located so that there is at least 0.100 inches (2.54 mm) minimum between the edges of holes. Also, holes should be located so that there is at least 0.125 inches (3.175 mm) between the edges of a hole and the trim periphery. It is also important to arrange the hole pattern so that the radial distance from the edge of the hole to the start of the blend radius at either the piston head or cylinder clamp flange is at least as far as indicated in the chart above.

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)

FC-38-12


0.38


10


0.25


6


0.12


3


.013


0.33


.065


1.7


0.08


0.5


0.11


2.8


FC-51-08


0.50


13


0.13


8


0.08


2


.015


0.38


.095


2.4


0.13


0.8


0.01


0.3


FC-50-10


0.50


13


0.31


8


0.10


3


.020


0.51


.095


2.4


0.13


0.8


1.01


0.3


FC-50-10


0.50


13


0.38


10


0.10


3


.015


0.38


.060


1.5


0.15


1.0


0.07


1.8


FC-56-06


0.56


14


0.50


13


0.06


2


.016


0.41


.030


0.8


0.22


1.4


0.01


0.3


FC-62-07


0.62


16


0.44


11


0.07


2


.015


0.38


.090


2.3


0.22


1.4


0.04


1.0


FC-62-10


0.62


16


0.50


13


0.10


3


.015


0.38


.060


1.5


0.25


1.6


0.07


1.8


FC-71-15


0.71


18


0.53


13


0.16


4


.018


0.46


.090


2.3


0.30


1.9


0.10


2.5


FC-72-04


0.72


18


0.52


13


0.04


1


.015


0.38


.100


2.5


0.30


1.9


0.01


0.3


FC-72-09


0.72


18


0.52


13


0.09


2


0.15


0.38


.100


2.5


0.30


1.9


0.06


1.5


FC-75-15


0.75


19


0.45


11


0.15


4


.017


0.43


.150


3.8


0.28


1.8


0.03


0.8


FC-75-10


0.75


19


0.62


16


0.10


3


.015


0.38


.065


1.7


0.37


2.4


0.07


1.8


FC-75-10


.075


19


0.63


16


0.10


3


.015


0.38


.060


1.5


0.37


2.4


0.07


1.8


FC-87-10


0.87


22


0.75


19


0.10


3


.015


0.38


.060


1.5


0.52


3.3


0.07


1.8


FC-88-10


0.88


22


0.66


17


0.10


3


.017


0.43


.110


2.8


0.47


3.0


0.01


0.3


FC-100-15


1.00


25


0.81


21


0.15


4


.017


0.43


.095


2.4


0.64


4.1


0.08


2.0


FC-100-15


1.00


25


0.81


21


0.15


4


.015


0.38


.095


2.4


0.64


4.1


0.08


2.0


FC-102-06


1.02


26


0.80


20


0.06


2


.008


0.20


.110


2.8


0.65


4.2


0.01


0.3


FC-106-06


1.06


27


0.94


24


0.06


2


.012


0.30


.060


1.5


.079


5.1


0.01


0.3


FC-107-15


1.07


27


0.88


22


0.15


4


.013


0.33


.095


2.4


0.75


4.8


0.08


2.0


FC-116-15


1.16


29


0.98


25


0.15


4


.013


0.33


.090


2.3


0.90


5.8


0.08


2.0


FC-117-12


1.17


30


0.87


22


0.12


3


.020


0.51


.150


3.8


0.82


5.3


0.01


0.3


FC-118-18


1.18


30


0.91


23


0.18


5


.025


0.64


.135


3.4


0.86


5.5


0.01


0.3


FC-125-09


1.25


32


1.03


26


0.09


2


.017


0.43


.110


2.8


1.02


6.6


0.01


0.3


FC-125-15


1.25


32


1.06


27


0.15


4


.017


0.43


.095


2.4


1.05


6.8


0.08


2.0


FC-132-10


1.32


34


1.08


27


0.10


3


.020


0.51


.120


3.0


1.13


7.3


0.01


0.3


FC-137-15


1.37


35


1.19


30


0.15


4


.020


0.51


.090


2.3


1.29


8.3


0.08


2.0


FC-138-18


1.38


35


1.06


27


0.18


5


.025


0.64


.160


4.1


1.17


7.5


0.01


0.3


FC-150-12


1.50


38


0.94


24


0.13


3


.022


0.56


.280


7.1


1.17


7.5


0.01


0.3


FC-150-05


1.50


38


1.25

32


0.05


1


.010


0.25


.125


3.2


1.48


9.6


0.01


0.3


FC-150-15


1.50


38


1.31


33


0.15


4


.017


0.43


.095


2.4


1.55


10.0


0.08


2.0


FC-155-15


1.55


39


1.30


33


0.15


4


.020


0.51


.125


3.2


1.59


10.3


0.01


0.3


FC-160-09


1.60


41


1.33


34


0.09


2


.013


0.33


.135


3.4


1.68


10.9


0.01


0.3


FC-161-09


1.61


41


1.33


34


0.09


2


.020


0.51


.140


3.6


1.70


10.9


0.01


0.3


FC-162-15


1.62


41


1.44


37


0.15


4


.017


0.43


.090


2.3


1.84


11.9


0.08


.02


FC-163-09


1.63


41


1.44


37


0.09


2


.015


0.38


.095


2.4


1.85


11.9


0.01


0.3


FC-170-28


1.70


43


1.27


32


0.28


7


.030


0.76


.215


5.5


1.73


11.2


0.10


2.5


FC-173-09


1.73


44


1.50


38


0.09


2


.013


0.33


.115


2.9


2.05


13.2


0.01


0.3


FC-175-15


1.75


44


1.56


40


0.15

4


.013


0.33


.095


2.4


2.15


13.9


0.08


2.0


FC-199-12


1.99


51


1.54


39


0.12


3


.020


0.51


.225


5.7


2.45


15.8


0.01


0.3


FC-200-15


2.00


51


1.81


46


0.15


4


.017


0.43


.095


2.4


2.85


18.4


0.08


2.0


FC-212-12


2.12


54


1.88


48


0.12


3


.018


0.46


.120


3.0


3.14


20.3


0.04


1.0


FC-225-15


2.25


57


2.06


52


0.15


4


.017


0.43


.095


2.4


3.65


23.5


0.08


2.0


FC-250-15


2.50


64


2.31


59


0.15


4


.017


0.43


.095


2.4


4.54


29.3


0.08


2.0


FC-295-12


2.95


75


2.70


69


0.12


3


.017


0.43


.125


3.2


6.26


40.4


0.01


0.3


FC-300-25


3.00


76


2.69


68


0.25


6


.024


0.61


.155


3.9


6.35


41.0


0.15


3.8


FC-308-12


3.08


78


2.70


69


0.12


3


.017


0.43


.190


4.8


6.56


42.3


0.01


0.3


FC-325-12


3.25


83


3.00


76


0.12


3


.017


0.43


.125


3.2


7.67


49.5


0.01


0.3


FC-402-27


4.02


102


3.66


93


0.27


7


.035


0.89


.180


4.6


11.58


74.7


0.11


2.8


FC-425-37


4.25


108


3.75


95


0.37


9


.035


0.89


.250


6.4


12.56


81.0


0.24


6.1


FC-600-37


6.00


152


5.5


140


0.37


9


.035


0.89


.250


6.4


25.95


167.4


0.24


6.1


FC-1150-50


11.50


292


11.00


279


0.50


13


.045


1.14


.250


6.4


99.35


641.0


0.37


9.4


*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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