Type D Diaphragms

General Description

Type D Diaphragm

This style diaphragm is the same as the Type F in all respects except flange mounting. The parts are molded with what equates to half of an O-ring on the flange rather than a large flat surface. This O-Ring half fits into a groove machined into the cylinder half of the hardware. Sealing is achieved by squeezing the bead into a properly sized groove (see table at bottom of page). The cylinder and bonnet can then be designed to make positive contact when assembled, eliminating the need for a closely controlled assembly torque. It also reduces the overall diameter of the diaphragm, reducing the hardware diameter.

 

Dimensions and Tolerances

Type D Dimensions and Tolerances

Inches mm Inches mm Inches mm Inches mm Inches mm
Cylinder Diameter
.37-.99
9-25
1.00-2.50
25-64
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
0.38 ± 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
0.38 ± 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
Flash Projection
.025 Max.
0.64 Max.
.025 Max.
0.64 Max.
.035 Max.
0.89 Max.
.040 Max.
1.02 Max.
.056 Max.
1.42 Max.
Flash Thickness
.025 Max.
0.64 Max.
.025 Max.
0.64 Max.
.035 Max.
0.89 Max.
.040 Max.
1.02 Max.
.056 Max.
1.42 Max.
Piston Radius
.094
2.39
.125
3.18
.156
3.96
.250
6.35
.250
6.35
Flange Radius
.031
0.79
.063
1.60
.094
2.39
.125
3.18
.125
3.18
Flange Diameter
Cyl. Diam. + .313
Cyl. Diam. + 7.95
Cyl. Diam. + .500
Cyl. Diam. + .12.70
Cyl. Diam. + .750
Cyl. Diam. + 19.05
Cyl. Diam. + 1.000
Cyl. Diam. + 25.40
Cyl. Diam. + 1.000
Cyl. Diam. + 25.40
Bead Width
.094 ± .003
2.39 ± 0.08
.125 ± .003
3.18 ± 0.08
.187 ± .003
4.75 ± 0.08
.250 ± .003
6.35 ± 0.08
.250 ± .004
6.35 ± 0.10
Bead Height
.095 ± .004
2.41 ± 0.10
.135 ± .004
3.43 ± 0.10
.200 ± .005
5.08 ± 0.13
.270 ± .007
6.86 ± 0.18
.270 ± .008
6.86 ± 0.20

 

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

0-1.00
.0-25.40
± .010
0.25
.010
0.25

1.01-3.00
25.65-76.20
± .020
0.51
.020
0.51

over 3.01
76.45
± .030
0.76
.030
0.76

 

Hardware Recommendations

Type D Hardware Recommendations


Cylinder Diameter
.25-.99
6-25
1.00-2.50
25-64
2.51-4.00
64-102
4.01-8.00
102-205
8.01 & up
205 & up

Groove Width
.109
2.77
.141
3.58
.219
5.56
.281
7.14
.281
7.14

± .003
0.08 ±

Groove Height
.076
1.93
.105
2.67
.160
4.06
.224
5.69
.224
5.69

± .002
0.05 ±

Flange & Piston Corner Radii
.031
0.79
.063
1.60
.094
2.39
.125
3.18
.125
3.18

Lip Width
.062
1.57
.125
3.18
.187
4.75
.250
6.35
.250
6.35

± .003
0.08 ±

Lip Clearance
.021
0.53
.021
0.53
.031
0.79
.036
0.91
.048
1.22

± .003
0.08 ±

 

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)

D-50-38
0.50
13
0.37
9
0.38
10
.015
0.38
.065
1.7
0.15
1.0
0.15
3.8

D-62-51
0.62
16
0.47
12
0.51
13
.015
0.38
.075
1.9
0.23
1.5
0.25
6.4

D-62-50
0.62
16
0.50
13
0.50
13
.015
0.38
.060
1.5
0.25
1.6
0.28
7.1

D-62-68
0.62
16
0.50
13
0.50
13
.015
0.38
.060
1.5
0.25
1.6
0.41
10.4

D-79-79
0.79
20
0.59
15
0.79
20
.017
0.43
.100
2.5
0.37
2.4
0.66
16.8

D-81-69
0.81
21
0.69
18
0.69
18
.016
0.41
.060
1.5
0.44
2.8
0.47
11.9

D-87-31
0.87
22
0.75
19
0.31
8
.015
0.38
.060
1.5
0.52
3.3
0.09
2.3

D-94-81
0.94
24
0.81
21
0.81
21
.017
0.43
.065
1.7
0.60
3.4
0.58
14.7

D-100-48
1.00
25
0.81
21
0.48
12
.012
0.30
.095
2.4
0.64
4.1
0.10
2.5

D-100-81
1.00
25
0.81
21
0.81
21
.020
0.51
.095
2.4
0.64
4.1
0.43
10.9

D-100-100
1.00
25
0.81
21
1.00
25
.017
0.43
.095
2.4
0.64
4.1
0.62
15.7

D-112-94
1.12
28
0.94
24
0.94
24
.017
0.43
.090
2.3
0.83
5.4
0.57
14.5

D-118-71
1.18
30
0.98
25
0.71
18
.017
0.43
.100
2.5
0.92
5.9
0.58
14.7

D-128-74
1.28
33
1.08
27
0.74
19
.017
0.43
.100
2.5
1.09
7.0
0.61
15.5

D-137-44
1.37
35
1.19
30
0.44
11
.017
0.43
.090
2.3
1.29
8.3
0.07
1.8

D-137-56
1.37
35
1.19
30
0.56
14
.017
0.43
.090
2.3
1.29
8.3
1.28
32.5

D-137-137
1.37
35
1.19
30
1.37
35
.017
0.43
.090
2.3
1.29
8.3
1.00
25.4

D-138-110
1.38
35
1.18
30
1.10
28
.017
0.43
.100
2.5
1.29
8.3
0.97
24.6

D-150-44
1.50
38
1.31
33
0.44
11
.017
0.43
.095
2.4
1.55
10.0
0.06
1.5

D-150-125
1.50
38
1.31
33
1.25
32
.017
0.43
.095
2.4
1.55
10.0
0.87
22.1

D-160-135
1.60
41
1.40
36
1.35
34
.015
0.38
.100
2.5
1.77
11.4
1.22
31.0

D-162-69
1.62
41
1.25
32
0.69
18
.014
0.36
.185
4.7
1.62
10.4
0.16
4.1

D-167-66
1.67
42
1.42
36
0.66
17
.017
0.43
.125
3.2
1.87
12.1
0.22
5.6

D-175-52
1.75
44
1.56
40
0.52
13
.017
0.43
.095
2.4
2.15
13.9
0.14
3.6

D-175-75
1.75
44
1.56
40
0.75
19
.017
0.43
.095
2.4
2.15
13.9
0.37
9.4

D-200-81
2.00
51
1.81
46
0.81
21
.020
0.51
.095
2.4
2.85
18.4
0.43
10.9

D-200-125
2.00
51
1.81
46
1.25
32
.017
0.43
.095
2.4
2.85
18.4
0.87
22.1

D-200-200
2.00
51
1.81
46
2.00
51
.017
0.43
.095
2.4
2.85
18.4
1.62
41.1

D-225-94
2.25
57
2.06
52
0.94
24
.017
0.43
.095
2.4
3.65
23.53
0.56
14.2

D-225-137
2.25
57
2.06
52
1.37
35
.017
0.43
.095
2.4
3.65
23.5
0.99
25.1

D-225-211
2.25
57
2.06
52
2.11
54
.017
0.43
.095
2.4
3.65
23.5
1.73
43.9

D-250-106
2.50
64
2.31
59
1.06
27
.017
0.43
.095
2.4
4.54
29.3
0.68
17.3

D-250-150
2.50
64
2.31
59
1.50
38
.017
0.43
.095
2.4
4.54
29.3
1.12
28.4

D-250-212
2.50
64
2.31
59
2.12
54
.017
0.43
.095
2.4
4.54
29.3
1.74
44.2

D-260-84
2.60
66
2.40
61
0.84
21
.017
0.43
.100
2.5
4.91
31.7
0.71
18.0

D-300-175
3.00
76
2.69
68
1.75
44
.024
0.61
.155
3.6
6.35
41.0
1.20
30.5

D-300-300
3.00
76
2.69
68
3.00
76
.024
0.61
.155
3.9
6.35
41.0
2.45
62.2

D-325-194
3.25
83
2.94
75
1.94
49
.024
0.61
.155
3.9
7.52
48.5
1.39
35.3

D-375-225
3.75
95
3.44
87
2.25
57
.024
0.61
.155
3.9
10.15
65.5
1.70
43.2

D-375-375
3.75
95
3.44
87
3.75
95
.024
0.61
.155
3.9
10.15
65.5
3.20
81.3

D-386-400
3.86
98
3.54
90
4.00
102
.030
0.76
.160
4.1
10.75
69.3
3.80
96.5

D-400-400
4.00
102
3.44
87
4.00
102
.030
0.76
.280
7.1
10.86
70.1
3.69
93.7

D-400-100
4.00
102
3.69
94
1.00
25
.024
0.61
.155
3.9
11.61
74.9
0.45
11.4

D-550-175
5.50
140
5.00
127
1.75
44
.035
0.89
.250
6.4
21.64
139.6
0.97
24.6

D-800-187
8.00
203
7.50
191
1.87
47
.035
0.89
.250
6.4
47.15
304.2
1.09
27.7

D-800-450
8.00
203
7.50
191
4.50
114
.035
0.89
.250
6.4
47.15
304.2
3.72
94.5

D-1200-100
12.00
305
11.50
292
1.00
25
.045
1.14
.250
6.4
108.38
699.2
0.22
5.6

D-1350-100
13.50
343
13.00
330
1.00
25
.045
1.14
.250
6.4
137.82
889.1
0.22
5.6

D-1500-100
15.00
381
14.50
368
1.00
25
.045
1.14
.250
6.4
170.79
1101.8
0.22
5.6

*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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