2results about How to "Reduce negative pressure" patented technology

This invention discloses a control method, system, equipment, and medium for a nitrogen-sealed split-range regulating valve in a storage tank, relating to the field of petrochemical production technology. The invention includes obtaining the design pressure value P of the nitrogen-sealed storage tank. S The invention monitors the real-time pressure P inside the nitrogen-sealed storage tank. When material increases in the tank, it automatically releases nitrogen gas from the top; when material is released, it automatically replenishes nitrogen gas from the top. Specifically, based on the monitored real-time pressure inside the nitrogen-sealed storage tank, logic control is used to control the opening degree of the nitrogen regulating valve and the vent regulating valve. This invention enables the pressure of the nitrogen-sealed storage tank to be controlled within a certain range, rather than a fixed value, reducing the frequent operation of the nitrogen valve and vent valve in each segmented control valve. It also allows for quantitative control of the valve opening, reducing nitrogen and material consumption and improving safety.

This utility model discloses a negative pressure prevention device for loading and unloading operations, relating to the field of sulfuric acid pipeline transportation. It includes a pressure-reducing pipe and a first pipeline. A pressure-reducing box is installed at the top of the pressure-reducing pipe, and a connecting box is connected to the top of the pressure-reducing box. A vent pipe is fixed to the end of the connecting box, and a connecting pipe is connected to one side of the pressure-reducing box. A rim is provided on the outer wall of the seal. When the electric valve is closed, the negative pressure inside the first pipeline attracts the seal, causing it to wrap around the top of the pressure-reducing pipe. The negative pressure also draws the rim on the seal inward, creating a gap between the seal and the pressure-reducing box. External gas enters the pressure-reducing box through the vent pipe and flows into the first pipeline through the connecting pipe, thereby filling the negative pressure area inside the first pipeline near the connecting pipe end, reducing the negative pressure and thus protecting the electric valve.