| 摘要 |
Apparatus for measuring the set pressure of a safety valve coupled to a pressure line, where the valve includes a springloaded closure element which is normally biased to close a port of the pressure line. The apparatus includes a position transducer (76) which generates a signal representative of the closure element position with respect to the port. In addition, a forcer (34, 36, 40) is selectively operable to apply a force ramp to the closure element (14) in the direction opposite to the springloaded bias. A force transducer (64) generates a signal representative of the force applied to the closure element. A measurement cycle controller (8) controls the measurement operation initially to activate the forcer. During the application of the force ramp to the closure element, a test time is identified. This test time occurs to mark when the closure element has moved a predetermined distance from its port position. At that test time, the controller detects the current pressure within the pressure line and the force currently applied to the closure element by the forcer, and then uses those detected values to generate a signal representative of the set pressure of the valve. |
