Abstract: A valve manifold (18) between a main flow line (10) and a differential pressure transmitter (24) having a body (40) with a bore (48) in which three spherical ball valve members (72, 74, 76) are mounted for rotation among run, zero and calibration positions. A low pressure calibrating port (28) and a high pressure calibrating port (46) are controlled by calibration valve member (76). Low pressure calibrating port (28) is connected to a source of a predetermined low pressure calibrating fluid and high pressure calibrating fluid port (46) is connected to a source of a predetermined high pressure calibrating fluid to calibrate transmitter (24) between any desired low pressure and high pressure ranges. Low pressure calibrating port (28) and high pressure calibrating port (46) may be selectively connected to atmospheric pressure if desired and the calibrating fluids may be controlled from a remote control site (26).

Abstract: For use in connecting a measuring instrument across a pipeline portion having an orifice therein to create a pressure drop whereby static and differential pressure signals are formed, a unitized connector apparatus is set forth in the preferred and illustrated embodiment and includes an elongate rectangular body having a lengthwise axial passage drilled therethrough. Additional passages intersect the long passage at the ends, and suitable valve means are included near the ends thereof. The structure is a unitized structure adaptable for quick and prompt installation with a minimum of connections made to the measuring instrument. Moreover, the structure is roddable, that is, the passages can be easily cleaned by means of a rod inserted therethrough.