Data Sheet

A81 Valve
D103301X012
Product Bulletin
21.1:A81
July 2012
10
Table 5. Maximum Allowable Shutoff Pressure Drops based on Trim (Seal, Shaft, and Bearings), Bar
Note: Do not exceed the E N or ASME pressure/temperature rating of the valve or mating flanges.
TRIM TEMPERATURE, _C
DN
50 80 100 150 200 250 300
Bar
PTFE or RPTFE Seal
PEEK/PTFE Bearings
-46 to 65
93
121
149
191
204
232
51.7
48.5
38.6
28.7
13.8
10.3
3.4
51.7
48.5
38.6
28.7
13.8
10.3
3.4
51.7
48.5
38.6
28.7
13.8
10.3
3.4
51.7
48.5
38.6
28.7
13.8
10.3
3.4
51.7
48.5
38.6
28.7
13.8
10.3
3.4
35.2
35.0
33.8
28.7
13.8
10.3
3.4
41.4
38.8
35.7
28.7
13.8
10.3
3.4
UHMWPE Seal
PEEK/PTFE Bearings
-17 to 37
66
93
51.7
38.6
25.9
51.7
38.6
25.9
51.7
38.6
25.9
51.7
38.6
25.9
51.7
38.6
25.9
35.2
35.1
25.9
41.4
38.6
25.9
Metal Seal
(1)
Alloy 6 Bearings
-46 to 37
93
149
204
260
316
371
427
454
18.5
17.0
16.0
15.1
14.3
13.8
13.2
12.5
12.1
16.5
15.1
14.2
13.4
12.8
12.3
11.9
11.6
11.5
13.9
12.8
12.0
11.4
10.8
10.3
10.0
9.8
9.7
12.8
11.7
11.0
10.4
9.9
9.5
9.2
9.0
8.9
11.0
10.1
9.4
9.0
8.5
8.2
7.9
7.7
7.7
6.8
6.3
5.9
5.6
5.3
5.1
5.0
4.8
4.8
7.0
6.5
6.1
5.7
5.4
5.2
5.0
5.0
4.9
Metal Seal
(1)
S31600/Nitride
Bearings
-46 to 37
93
149
204
260
316
371
427
454
19.5
19.3
17.0
15.9
14.5
13.8
13.2
12.5
12.1
22.4
22.4
22.4
22.4
22.4
22.1
21.5
20.7
20.3
26.1
26.0
23.7
22.7
21.4
20.8
20.2
19.5
19.2
20.8
20.6
18.7
17.8
16.8
16.2
15.7
15.2
14.9
27.6
27.6
27.6
26.3
24.6
23.2
22.4
21.8
21.6
12.8
12.8
12.8
12.8
12.5
12.1
11.8
11.4
11.2
8.0
7.9
7.1
6.8
6.3
6.1
5.9
5.6
5.4
Metal Seal
(1)
PEEK/PTFE Bearings
-46 to 37
93
149
204
232
260
51.7
51.7
50.3
48.6
47.2
24.7
51.7
51.7
50.3
48.6
47.2
21.9
51.7
51.7
50.3
48.6
46.3
18.5
51.7
51.7
50.3
48.2
42.6
17.0
31.0
31.0
31.0
31.0
31.0
14.6
17.2
17.2
17.2
17.2
17.2
9.1
17.2
17.2
17.2
17.2
17.2
9.4
1. Pressure drops shown for metal seals are for forward flow only.