Switching device with inlet and outlet synchronous sealing function

Abstract

The invention discloses a switching device with an inlet and outlet synchronous sealing function. The switching device comprises a first safety valve, a second safety valve, a safety valve inlet switching device and a safety valve outlet switching device. The first safety valve, the second safety valve, the safety valve inlet switching device and the safety valve outlet switching device are connected in a ring mode. A plurality of circular holes are formed in valve bases of the safety valve inlet switching device and the safety valve outlet switching device, and springs are connected with theinteriors of the circular holes. The switching device is simple in structure, convenient to operate and high in sealing performance, improves the production efficiency and reduces the production cost.

Description

technical field [0001] The invention relates to a switching device, in particular to a switching device for synchronous sealing of an inlet and an outlet. technical background [0002] Sinopec PetroChina and other enterprises have some important equipment that needs to be continuously produced all year round, even during the annual overhaul period, there are still people shutting down. According to the "Safety Valve Safety Technology Supervision Regulations", the safety valve should be checked once a year under normal circumstances. For this kind of equipment that cannot be stopped, a gate valve or a stop valve is usually installed under the safety valve (this requires the approval of the technical director of the unit) In order to install the shut-off valve under the safety valve), so that when the safety valve is due to failure or annual inspection, the valve below is closed and the safety valve is removed for maintenance or calibration. In that case, these important equip...

AI Technical Summary

Problems solved by technology

According to the "Safety Valve Safety Technology Supervision Regulations", the safety valve should be checked once a year under normal circumstances. For this kind of equipment that cannot be stopped, a gate valve or a stop valve is usually installed under the safety valve (this requires the approval of the technical director of the unit) In order to install the shut-off valve under the safety valve), so that when the safety valve is due to failure or annual inspection, the valve below is closed and the safety valve is removed for maintenance or calibration. In that case, these important equipment may be in a certain It is extremely unsafe to lose the overpressure protection of the safety valve within a period of time. Once an accident occurs, the consequences will be disastrous

[0003] In order to ensure the safety of these equipments, some enterprises install two sets of safety valves and shut-off valve systems on the equipment as one for backup and one for use, while some enterprises at home and abroad use switching devices and safety valves for overpressure protection. If the safety valve is allowed to empty after take-off, it only needs to be switched at the safety valve inlet. In some cases, it is necessary to switch the safety valve inlet and outlet synchronously. For example, it is harmful, toxic, flammable and explosive media. It is necessary to switch the inlet and outlet of the safety valve synchronously, that is, to open or close the inlet and outlet passages of the safety valve synchronously. The biggest defect of the existing design is that the inlet and outlet discs driven by the sprocket cannot be sealed synchronously. Due to factors such as errors, there is always a The valve disc is closed first, and the other valve disc is not closed tightly and the seal exceeds the standard. The general solution is to slowly make up the thickness of the valve seat during assembly, so that the two valve discs are closed at the same time and meet the sealing performance requirements. Time-consuming and laborious, inefficient and unable to ensure that the seal is up to standard

Images