| AVAILABLE SHUTOFF PRESSURE DROPS WITH COMMON INSTRUMENTATION |
| ACTUATOR ACTION |
FLOW DIRECTION (PRESSURE TENDS TO) |
PORT DIAMETER |
TYPE OF ACTUATOR SPRING |
| LIGHT SPRING |
HEAVY SPRING |
| 0-18 PSIG (0-1.24 BARG) OPERATING PRESSURE |
0-20 PSIG (0-1.38 BARG) OPERATING PRESSURE |
0-30 PSIG (0-2.07 BARG) OPERATING PRESSURE |
0-33 PSIG (0-2.28 BARG) OPERATING PRESSURE |
0-35 PSIG (0-2.41 BARG) OPERATING PRESSURE |
0-50 PSIG (0-3.45 BARG) OPERATING PRESSURE |
| FAIL CLOSED |
FLOW UP (OPENS VALVE) |
1/4" (6.4mm) |
3,750 PSI (259 BAR) |
3,750 PSI (259 BAR) |
3,750 PSI (259 BAR) |
3,750 PSI (259 BAR) |
3,750 PSI (259 BAR) |
3,750 PSI (259 BAR) |
| 3/8" (9.5mm) |
3,750 PSI (259 BAR) |
3,750 PSI (259 BAR) |
3,750 PSI (259 BAR) |
3,750 PSI (259 BAR) |
3,750 PSI (259 BAR) |
3,750 PSI (259 BAR) |
| 1/2" (12.7mm) |
2,765 PSI (191 BAR) |
2,765 PSI (191 BAR) |
3,180 PSI (219 BAR) |
3,750 PSI (259 BAR) |
3,750 PSI (259 BAR) |
3,750 PSI (259 BAR) |
| 3/4" (19.1mm) |
1,160 PSI (80 BAR) |
1,160 PSI (80 BAR) |
1,340 PSI (92 BAR) |
1,785 PSI (123 BAR) |
2,080 PSI (143 BAR) |
2,080 PSI (143 BAR) |
| 1" (25.4mm) |
610 PSI (42 BAR) |
610 PSI (42 BAR) |
715 PSI (49 BAR) |
965 PSI (67 BAR) |
1,130 PSI (78 BAR) |
1,130 PSI (78 BAR) |
| 1-1/4" (31.8mm) |
365 PSI (25 BAR) |
365 PSI (25 BAR) |
430 PSI (30 BAR) |
590 PSI (41 BAR) |
700 PSI (48 BAR) |
700 PSI (48 BAR) |
| FAIL OPEN |
FLOW UP (OPENS VALVE) |
1/4" (6.4mm) |
3,750 PSI (259 BAR) |
3,750 PSI (259 BAR) |
3,750 PSI (259 BAR) |
3,750 PSI (259 BAR) |
3,750 PSI (259 BAR) |
3,750 PSI (259 BAR) |
| 3/8" (9.5mm) |
3,750 PSI (259 BAR) |
3,750 PSI (259 BAR) |
3,750 PSI (259 BAR) |
3,750 PSI (259 BAR) |
3,750 PSI (259 BAR) |
3,750 PSI (259 BAR) |
| 1/2" (12.7mm) |
2,715 PSI (187 BAR) |
3,380 PSI (233 BAR) |
3,750 PSI (259 BAR) |
3,750 PSI (259 BAR) |
3,750 PSI (259 BAR) |
3,750 PSI (259 BAR) |
| 3/4" (19.1mm) |
1,135 PSI (78 BAR) |
1,430 PSI (99 BAR) |
2,130 PSI (147 BAR) |
2,575 PSI (178 BAR) |
2,875 PSI (198 BAR) |
3,750 PSI (259 BAR) |
| 1" (25.4mm) |
600 PSI (41 BAR) |
765 PSI (53 BAR) |
1,160 PSI (80 BAR) |
1,410 PSI (97 BAR) |
1,575 PSI (109 BAR) |
2,830 PSI (195 BAR) |
| 1-1/4" (31.8mm) |
355 PSI (24 BAR) |
465 PSI (32 BAR) |
715 PSI (49 BAR) |
875 PSI (60 BAR) |
985 PSI (68 BAR) |
1,785 PSI (123 BAR) |
| NOTES: |
(1) When using an instrument such as a positioner or controller with a 3-15 PSI (0.21-1.05 BAR) input signal use the 0 to 20 PSIG column (Light Spring). |
| (2) For valve use where downstream pressure exceeds 2,750 PSIG (190 BARG), 2,750 PSIG should be used as the Maximum Shut-off Pressure. |
| (3) Do not exceed the Pressure Temperature Limitations as per ASME B16.34. |
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| AVAILABLE SHUTOFF PRESSURE DROPS WITH RESTRICTED OUTPUT RANGE INSTRUMENTATION |
| ACTUATOR ACTION |
PORT DIAMETER |
TYPE OF ACTUATOR SPRING |
| HEAVY SPRING |
| 6-30 PSIG (0.41-2.07 BARG) OPERATING PRESSURE |
| FAIL CLOSED |
1/4" (6.4mm) |
3,750 PSI (259 BAR) |
| 3/8" (9.5mm) |
3,045 PSI (210 BAR) |
| 1/2" (12.7mm) |
1,635 PSI (113 BAR) |
| 3/4" (19.1mm) |
655 PSI (45 BAR) |
| 1" (25.4mm) |
330 PSI (23 BAR) |
| 1-1/4" (31.8mm) |
185 PSI (13 BAR) |
| FAIL OPEN |
1/4" (6.4mm) |
3,750 PSI (259 BAR) |
| 3/8" (9.5mm) |
3,750 PSI (259 BAR) |
| 1/2" (12.7mm) |
2,845 PSI (196 BAR) |
| 3/4" (19.1mm) |
1,195 PSI (82 BAR) |
| 1" (25.4mm) |
630 PSI (43 BAR) |
| 1-1/4" (31.8mm) |
380 PSI (26 BAR) |
| NOTES: |
(1) Instrument Example: for a Electro-Pneumatic Transducer calibrated for 6 to 30 PSIG (0.41 to 2.07 BARG). |
| (2) For fail closed valve use where downstream pressure exceeds 1,715 PSIG (118 BARG), 1,715 PSIG should be used as the Maximum Shut-off Pressure. |
| (3) For fail open valve use where downstream pressure exceeds 2,750 PSIG (190 BARG), 2,750 PSIG should be used as the Maximum Shut-off Pressure. |
| (4) Do not exceed the Pressure Temperature Limitations as per ASME B16.34. |
