Profile: JPL Mfg. Co.,Inc. manufacture and fabricates measurement & pressure control related products for transmission, distribution & production. We offer various products such as domestic & commercial diaphragm, large volume turbine, low pressure & high pressure rotary meters, catalytic heaters, and thermo-wells. The orifice meter is a device used for measuring the rate of fluid flow. It uses the same principle as a venturi nozzle, namely Bernoulli's principle. The safety shutoff valves are safety valves used to close a line and stop the flow of material. Some types are manually closed, while others are automated to act when a preset condition such as a failure in the system occurs.