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5.4 Rotating flange diaphragm seal - Ring Joint (S26RR)
The flanged flush diaphragm remote seal – ring joint is designed to connect to ASME flanged pipe fitting. On the 1 in. seal the
process flange and nuts are supplied by the user. On the 1-1/2 in. and 2 in. seals the process flange, bolts and nuts are supplied
by the user. A user-supplied gasket must be installed between the process pipe flange and the lower housing of each seal.
These seals are available with a flushing connection in the lower housing. The connection provides a 1/4 in. NPT port into the
cavity around the seal diaphragm to permit flushing to remove trapped solids, when necessary. The flushing connection also
provides a means of checking calibration without disconnecting the element. A gate or ball valve installed in the process line
near the seal connection allows the process to be isolated and calibration pressure can then be applied via the flushing
connection. Use of a gate or ball type valve avoids restricting the process line during normal operation.
Connect the seal as follows:
1. Install a gasket between the process flange and the seal element gasket surface.
2. Bolt the seal to the process flange.
3. Tighten bolts (nuts on 1 in. seal) firmly and uniformly in accordance with standard industrial flange bolting practices.
4. If the seal has a flushing connection, connect a flushing line with appropriate valving to the 1/4 in. connection.
Figure 18: Ring-joint diaphragm seal
Size/Rating
1-1/2 in. ASME CL 150
1-1/2 in. ASME CL 300
1-1/2 in. ASME CL 600
1-1/2 in. ASME CL 900/1500
1-1/2 in. ASME CL 2500
2 in. ASME CL 150
2 in. ASME CL 300
2 in. ASME CL 600
2 in. ASME CL 900/1500
2 in. ASME CL 2500
3 in. ASME CL 150
3 in. ASME CL 300
3 in. ASME CL 600
3 in. ASME CL 900
3 in. ASME CL 1500
3 in. ASME CL 2500
For any other detailed information regarding S26RR seal such as pressure limits, vacuum service recommendations, process
temperature limits, temperature effects and configuration, please refer to product datasheet.
18 OI/S26-EN Rev. B | 2600T Series Pressure transmitters
A (dia)
B (dia)
C (dia)
48 (1.89)
83 (3.27)
98.6 (3.88)
48 (1.89)
90 (3.54)
114.3 (4.5)
48 (1.89)
90 (3.54)
114.3 (4.5)
48 (1.89)
92 (3.62)
124 (4.88)
48 (1.89)
114 (4.49)
146.1 (5.75)
60 (2.36)
102 (4.02) 120.65 (4.75)
60 (2.36)
108 (4.25)
127 (5)
60 (2.36)
108 (4.25)
127 (5)
60 (2.36)
124 (4.88)
165 (6.5)
60 (2.36)
133 (5.24)
171.5 (6.75)
89 (3.5)
133 (5.24)
152.4 (6)
89 (3.5)
146 (5.75) 168.15 (6.62) 209.55 (8.25) 22.35 (0.88) 28.44 (1.12) 17.3 (0.68) 123.8 (4.87) R31
89 (3.5)
146 (5.75) 168.15 (6.62) 209.55 (8.25) 22.35 (0.88) 31.75 (1.25) 17.3 (0.68) 123.8 (4.87) R31
89 (3.5)
155 (6.10)
190.5 (7.5)
89 (3.5)
168 (6.61)
203.2 (8)
89 (3.5)
168 (6.61)
228.6 (9)
Dimensions mm (in) for S26RR
D (dia)
E (dia)
127 (5)
15.75 (0.62)
17.5 (0.69)
155.5 (6.12) 22.35 (0.88)
20.6 (0.81)
155.5 (6.12) 22.35 (0.88)
22.4 (0.88)
177.8 (7)
28.45 (1.12)
31.8 (1.25)
203.2 (8)
31.75 (1.25)
44.5 (1.75)
152.4 (6)
19.05 (0.75) 19.05 (0.75) 17.3 (0.68)
165.1 (6.5)
19.05 (0.75) 22.35 (0.88) 17.3 (0.68)
165.1 (6.5)
19.05 (0.75)
25.4 (1)
215.9 (8.5)
25.4 (1)
38.1 (1.5)
235 (9.25)
28.45 (1.12)
50.8 (2)
190.5 (7.5)
19.05 (0.75) 23.87 (0.94) 17.3 (0.68)
241.3 (9.5)
25.4 (1)
38.1 (1.50)
266.7 (10.5) 31.75 (1.25)
47.8 (1.88)
304.8 (12)
35.05 (1.38)
66.5 (2.62)
F
G
158
F
G
H (dia)
17.3 (0.68)
65.1 (2.56)
17.3 (0.68)
68.3 (2.69)
17.3 (0.68)
68.3 (2.69)
20.8 (0.82)
68.3 (2.69)
20.8 (0.82)
82.6 (3.25)
82.6 (3.25)
82.6 (3.25)
17.3 (0.68)
82.6 (3.25)
20.8 (0.82)
95.3 (3.75)
20.8 (0.82)
101.6 (4)
114.3 (4.5)
20.8 (0.82) 123.8 (4.87) R31
20.8 (0.82) 136.5 (5.37) R35
20.8 (0.82)
127 (5)
N° of
R
holes
R19
4
R20
4
R20
4
R20
4
R23
4
R22
4
R23
8
R23
8
R24
8
R26
8
R29
4
8
8
8
8
R32
8
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