Angle control valve of the rational use
Angle control valves are known for their simple flow path and low resistance, making them suitable for standard forward installation in most applications. However, under conditions of high pressure drop, it is advisable to install the valve in reverse. This helps reduce unbalanced forces on the valve plug and minimizes damage to the internal components. Additionally, reverse installation can improve media flow and prevent coking or plugging, especially in systems handling viscous or particulate-laden fluids. It is important to avoid keeping the valve at a small opening for extended periods during reverse use, as this can lead to severe vibrations and potential damage to the spool.
In particular, during the trial production phase of chemical plants, where load levels are often low and process conditions may not be fully optimized, the reverse installation of angle control valves should be avoided whenever possible. This is crucial to prevent unnecessary wear and tear, ensuring the longevity and reliability of the valve.
Control valves play a vital role in automated control systems, often referred to as the "hands and feet" of the system. They consist of an actuator and the valve body, and function by adjusting the flow through changes in local resistance. Based on input signals, the valve stem moves to alter the flow coefficient, thereby regulating the flow rate.
The structure of an angle control valve is similar to that of a single-seat valve, except for the angular body. Its design allows for a straightforward flow path, which is ideal for high-pressure drop applications, as well as for fluids with high viscosity, suspended solids, or particles. This makes it less prone to coking, sticking, or clogging, and also easier to clean and maintain.
In general, angle control valves are installed in the forward direction, with the fluid flowing from the bottom to the top. However, in cases involving high pressure, high viscosity, or media that tends to coke or contain particulates, reverse installation is recommended. In such cases, the fluid enters from the bottom, improving flow characteristics and reducing wear on the valve core.
A case study involving an imported angle control valve (PV-23404) at Jilin Chemical Industry Co., Ltd. highlighted the risks of improper use. During a water test, the valve experienced strong oscillations and emitted loud noises, eventually leading to spool failure after 4 hours. Although foreign experts initially suspected manufacturing defects, further analysis revealed that the issue stemmed from improper usage—specifically, prolonged operation at a small opening under reverse installation. This led to significant instability due to unbalanced forces, causing rapid damage to the valve core.
Under normal operating conditions, the valve is typically used at moderate openings, and even when partially open, the duration is short enough to prevent damage. Therefore, proper installation and operational practices are essential to ensure safe and reliable performance.
In conclusion, while angle control valves are generally not recommended for reverse installation, they may be beneficial in specific high-pressure or high-viscosity applications. When used in reverse, care must be taken to avoid long-term small openings, especially during testing phases, to prevent damage and ensure optimal performance.
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