Introduction and function of throttle orifice plate

When the difference between the front and back of the pipeline is large, the method of throttling and increasing the orifice plate is often used. When the fluid flows in the pipeline, the thermodynamic throttling phenomenon of the fluid reduction due to the local resistance of the orifice plate. This method is simpler than using a regulating valve, but should be selected appropriately. Otherwise, the liquid is easy to produce steam type phenomenon, which will affect the operation of the pipeline.

Introduction and function of throttle orifice plate

The orifice plate reduces the diameter of the hole in the appropriate position of the pipe, and when the liquid passes through the weakened, the flow beam plays a slender or weakened role. The cross section of the flow occurs downstream of the actual weakening. This is called the weakened cross section. The flow velocity of the weakened section is such. The increase in flow velocity is caused by the greatly reduced weakening cross section. When the stream expands to a larger area, the velocity will slow down and the gravity will increase, but the downstream cannot fully return to the upstream gravity due to the result of greater internal turbulence and consumption.

When the gravity PVC of the weakened cross-section drops below the gravity PV of the saturated steam at the corresponding temperature of the liquid, the stream will make the steam and the gas dissolved in the water escape, forming small bubbles of steam and gas mixture. The lower the gravity, the more bubbles. When the gravity p2 downstream of the orifice plate is still lower than the saturated vapor gravity of the liquid, foam continues to occur in the downstream pipeline, and there is a two-phase mixing of the liquid and vapor. This is the flash phenomenon. After the downstream gravity is restored to be higher than the saturated steam gravity of the liquid, the foam quickly condenses and breaks under the action of high pressure. At the moment of foam explosion, the high pressure flows into the space occupied by the original foam at high speed, forming an impact. The gas and steam in the bubble are all dissolved instantly and do not condense. Under the action of the impact force, they are divided into small bubbles, compressed by high pressure, condensed, and repeated many times. The phenomenon similar to the noise of sand and gravel passing through the pipeline that we can imagine is called Republic. The surface of the runner material is fatigued under the gravity of water hammer and severely damaged. We call the entire process of bubble formation, development, rupture and destruction of materials a republican phenomenon.

what is the principle of throttle orifice plate?

The pressure difference between the front and back of the pipeline is large, and the local resistance of the orifice plate when the fluid flows in the pipeline causes the gravity of the fluid to decrease. The energy loss is thermodynamically called the throttling phenomenon, and the throttling orifice plate increases. This method is simpler than using a regulating valve, but it should be selected correctly. Otherwise, the liquid is easy to corrode, which will affect the safe operation of the pipeline.

The function of the orifice plate is to make the diameter of the hole in the pipe smaller, and the liquid makes the flow thinner or narrower by weakening. The smaller flow beam cross section that occurs downstream of the actual attenuation is called the attenuation cross section. The flow velocity of the weakened section is the larger velocity of the weakened section. With the increase of the velocity of the weakened section, the gravity of the weakened section decreases obviously. As the stream expands to a larger field, the speed slows down and the gravity increases, but the downstream gravity does not fully restore the upstream gravity, which is the result of internal turbulence and increased energy consumption. When the gravity PVC of the weakened cross-section drops below the gravity PV of the saturated steam at the corresponding temperature of the liquid, the steam and the gas dissolved in the water in the stream will escape to form small bubbles. The lower the gravity, the larger the foam. When the gravity downstream of the orifice plate is still lower than the gravity of the liquid saturated steam, foam will continue to be generated in the downstream pipeline, and flash will occur when there is a two-phase mixture of liquid and steam. When the downstream gravity is restored to be higher than the saturated vapor gravity of the liquid, the bubbles will quickly condense and burst under high pressure, and local holes will be generated at the moment of bubble rupture, and the high pressure will flow to the space occupied by the original bubbles at a faster speed, forming an impact force. The gas and steam in the bubble are completely dissolved instantly and do not condense. They are decomposed into small bubbles under the action of impact force, compressed and condensed by high pressure, and repeated many times to produce a kind of noise. This phenomenon is called a bubble. Under the water hammer gravity, the surface of the runner material is fatigued and severely damaged. The whole process of foam formation, development and rupture is called "diet" phenomenon, that is, the destruction of materials. This is the principle and function of the throttle orifice plate introduced to you. Hope to help you!