Abstract: Test apparatus is provided for measuring the set pressure of a valve coupled to a port in a pressure line. The valve includes a closure element movable between a first limit position sealing the port and a second limit position opening the port. Spring loaded element is provided for biasing the closure element towards said first limit position. An expandable diaphragm device is provided which, upon the introduction of air pressure into an airtight chamber defined by a movable piston, the diaphragm and a base element, is adapted to apply a force ramp to the closure element in a direction opposite to the direction of the bias provided by the spring loaded element. There is also provided an element for calculating the set pressure of said valve.

Abstract: A dual bellows apparatus for controlled, programmed application of forces to an extension of the spindle of a spring loaded safety relief valve. A controller which may be remote from the valve is adapted to perform a plurality of functions on the valve while installed in an operating system by pressurization of the respective bellows. These functions include force-assisted opening of the valve, force-assisted blowdown, anti-simmer control and measurement of the set pressure.

Abstract: A device 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 device includes a position transducer which generates a signal representative of the closure element position with respect to the port. In addition, a forcer is selectively operable to apply a force ramp to the closure element in the direction opposite to the springloaded bias. A force transducer generates a signal representative of the force applied to the closure element. A measurement cycle controller 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.