In the automatic adjustment system of the production process, the regulating valve is an important and indispensable link. It is called the “hand and foot†of the automation of the production process and is one of the terminal control components of the automatic control system. In the automatic adjustment system of the production process, the regulating valve is an important and indispensable link. It is called the “hand and foot†of the automation of the production process and is one of the terminal control components of the automatic control system. It consists of two parts: the actuator and the valve. From the hydraulic point of view, the regulating valve is a throttling element whose local resistance can be changed. The regulating valve changes the drag coefficient according to the input signal by changing the stroke, thereby achieving the purpose of regulating the flow. Structure and use of angle control valve The structure of the angle control valve of the 1st angle control valve is similar to that of the single seat valve except that the valve body is angled. Its characteristics determine its simple flow path and low resistance, which is especially beneficial for high pressure drop. , high viscosity, conditioning with fluids containing suspended matter and particulate matter. It avoids coking, sticking and clogging, and is easy to clean and self-clean. Comparison of positive and negative use of 2 angle control valve In general, the angle control valves are installed in the forward direction, that is, the bottom side is out. Reverse installation is recommended only in the case of high pressure differentials and high viscosity, easy coking, and suspended particulate media, ie the material is side-in and out. The purpose of the reverse use of the angle control valve is to improve the imbalance force and reduce the wear on the valve core, and also to facilitate the flow of high viscosity, easy coking and suspended particulate media, avoiding coking and clogging. Analysis of the reverse use of the angle control valve The angle control valve is recommended for reverse use under high pressure drop process conditions. During the water linkage test, the angle control valve produced strong oscillation and gave a harsh noise. After 4 hours of test , the spool broke. At that time, foreign experts believed that the quality of the valve core was not good. But it is not a quality issue, but it is caused by unreasonable use. The following is an analysis of the cause of the fracture. We know that all other structural regulators are asymmetrical except that the butterfly and diaphragm valves are structurally completely symmetrical. When the regulating valve changes the flow direction, a change in the value due to a change in the flow path is caused. The normal flow direction of each type of regulating valve is the direction in which the spool is opened (forward use), and the regulating valve manufacturer only provides the flow capacity and flow characteristics in the normal flow direction. When the regulating valve is used in reverse, the flow capacity of the regulating valve increases as the fluid flows in the direction in which the spool is closed. When the water linkage test is carried out, the simulated process conditions cannot reach the normal state very quickly, and the regulating valve is used in a small opening state for a long time. Due to the unbalanced force, serious instability may occur. Therefore, the regulating valve generates a strong shock and makes a harsh noise, which causes the spool to break quickly. Under normal process conditions, the opening of the regulating valve is moderate, even if the small opening is short, the regulating valve can be used safely. Angle regulator application conclusion In general, the angle control valve is not recommended for reverse use. Reverse use is recommended only for high pressure differential, high viscosity, easy coking and medium containing suspended particles. When used in reverse, it should be avoided in the case of long-term small opening, especially when testing. Jiangsu Tiera Biotechnology Co., Ltd , https://www.tierabio.com
The angle control valve has a simple flow path and low resistance, and is generally suitable for forward use (installation). However, in the case of high pressure drop, it is recommended to use the angle control valve in reverse to improve the imbalance force and reduce the damage to the valve core, and also facilitate the flow of the medium, avoiding the coking and clogging of the regulating valve. When the angle control valve is used in reverse, it should be especially avoided when the small opening is opened for a long period of time to prevent strong oscillation and damage the valve core. Especially in the pilot production stage of chemical plants, due to the low load during the trial production and the design process conditions, it is impossible to meet the requirements quickly. The reverse-type angle control valve should avoid the opening of the small opening for a long time as much as possible. The angle control valve is damaged.