Notes on the use of the angle control valve
The angle control valve is similar to the single seated valve on structure except that the valve body is angled. Its characteristics determine its simple flow path and low resistance, especially suitable for regulating the fluids with high pressure drop, high viscosity, suspension and granular substances. It avoids coking, sticking and clogging, and is easy to clean and self-clean.
Notes on the use of angle control valve:
(1) Comparison of installation at forward direction and opposite direction: Under normal circumstances, the angle control valves are all installed in the forward direction, that is, the bottom is inlet, the side is outlet. Reverse installation is recommended only in the case of high pressure drop and high viscosity, easy coking, and suspended particulate media, i.e. the material is introduced from the side and passes away from the bottom. 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.
(2) Analysis of the reverse use of the angle control valve: Jilin Chemical Industry Co., Ltd. introduced the acetaldehyde plants from West Germany, among which, the pv-23404 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 valve spool broke. At that time, foreign experts believed that the quality of the valve spool was not good, which leads to the broken valve spool. Some people believe that it is not a quality problem, but because of unreasonable use. The following is an analysis of the cause of the fracture. We know that all other structural control valves are asymmetrical except that the butterfly valves 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 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. Serious instability can occur due to the effects of imbalance. 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, so the regulating valve can be used safely.
(3) 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 avoid small opening 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 small opening for a long time as much as possible. Otherwise, the angle control valve will be damaged. 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, the angle control valve should avoid running under long-term small opening conditions, especially during testing.
Notes on the use of angle control valve:
(1) Comparison of installation at forward direction and opposite direction: Under normal circumstances, the angle control valves are all installed in the forward direction, that is, the bottom is inlet, the side is outlet. Reverse installation is recommended only in the case of high pressure drop and high viscosity, easy coking, and suspended particulate media, i.e. the material is introduced from the side and passes away from the bottom. 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.
(2) Analysis of the reverse use of the angle control valve: Jilin Chemical Industry Co., Ltd. introduced the acetaldehyde plants from West Germany, among which, the pv-23404 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 valve spool broke. At that time, foreign experts believed that the quality of the valve spool was not good, which leads to the broken valve spool. Some people believe that it is not a quality problem, but because of unreasonable use. The following is an analysis of the cause of the fracture. We know that all other structural control valves are asymmetrical except that the butterfly valves 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 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. Serious instability can occur due to the effects of imbalance. 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, so the regulating valve can be used safely.
(3) 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 avoid small opening 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 small opening for a long time as much as possible. Otherwise, the angle control valve will be damaged. 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, the angle control valve should avoid running under long-term small opening conditions, especially during testing.
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