Abstract: A ported bushing for use with a pressure switch for monitoring the pressure of pressurized hydrocarbons flowing through a pipeline is provided, the ported bushing having a main body containing a threaded opening for attaching the pressure switch, two threaded test ports for attaching testing equipment thereto and a threaded end for attaching the ported bushing to a valve attached to the pipeline. The ported bushing can include a tubular body, and can be configured to adapt to different diameters of pressure switches and valves. The ported bushing can further include flattened surfaces for use with a wrench to rotate the bushing. The ported bushing can further include a gauge and a test valve coupled to the test ports to enable the testing of the pressure switch in-situ when the valve is closed.

Abstract: A housing for a pressure switch is coupled to a pipeline. The housing has a tubular body with an explosion-proof enclosure attached to the body with a retainer sleeve inserted through an opening in the enclosure and threaded into the body to secure the enclosure to the body in an axial direction. The body of the housing may be coupled to the pipeline via an interstitial trim device. The body and trim are preferably coupled together using left-hand threads. The enclosure is further secured to the body by a pin that extends from the enclosure into a corresponding pin receptacle in the body. The pin opposes rotation of the enclosure with respect to the body and prevents attempts by field personnel to remove the pressure switch from a pipeline by simply turning the enclosure. This arrangement also avoids disruption of the calibration of micro-switch components contained within the enclosure.

Abstract: The present invention is concerned with cover assemblies for manually resetting pressure switches used on oil and gas pipelines. The cover assembly encloses a volume of space on the pressure switch that houses a reset switch which is activated by depressing a button located on top of the reset switch. The cover assembly has a housing with a rod or plunger extending through the housing. On the exterior end of the rod is a protective cap and on the interior is a flexible rubber hemispherical bumper. A spring disposed between the cap and the exterior side of the cover housing biases the bumper away from the button on the reset switch. In operation, the cap is pushed towards the housing causing the rod or plunger to advance towards and contact the reset switch button. The bumper deforms or balloons outward upon contact with the button so as to impart sufficient force to depress the button but not so much force so as to damage or break the reset switch itself.