An angle-type regulating valve is a specialized type of control valve designed to regulate fluid flow in industrial processes. Its unique structure allows for efficient handling of high-pressure drops, viscous fluids, and media containing suspended particles or particulates. Here's a closer look at its structure and some points to consider during use:
Structure of Angle-Type Regulating Valve
Angle-Type Valve Body: Unlike a straight-through valve, the angle-type valve body is configured at a 90-degree angle, allowing for a more direct flow path and reduced turbulence. This design simplifies the flow path and reduces the resistance encountered by the fluid.
Actuator and Valve: Like other regulating valves, the angle-type valve consists of an actuator (which can be pneumatic, electric, or hydraulic) and the valve itself. The actuator controls the position of the valve core or plug, thereby regulating the flow.
Throttling Element: The core or plug of the valve acts as a throttling element that can vary the resistance to flow, thus controlling the flow rate of the fluid passing through the valve.
Characteristics
Simple Flow Path: The simplified flow path of the angle-type valve helps in reducing the overall resistance, making it ideal for applications where minimizing pressure drop is crucial.
Handling of Special Fluids: It is particularly suited for handling high-viscosity fluids, fluids with suspended solids, and those prone to coking or adhesion, as the design facilitates easier cleaning and reduces the likelihood of blockages.
Points for Attention in Use
When using an angle-type regulating valve, several factors must be considered to ensure safe and effective operation:
1. Forward VS. Reverse Use
Forward Use: Typically, the angle control valve is installed in the forward direction, where the fluid enters from the bottom and exits from the side. This is the standard configuration and is preferred in most applications.
Reverse Use: In cases where the process conditions involve high-pressure drops, high viscosity, or media that are likely to clog or coke, reverse installation (side entry, bottom exit) might be recommended. This can improve the balance of forces acting on the valve core, reduce wear, and facilitate the flow of problematic media.
2. Analysis of Reverse Use
Unbalanced Forces: Reversing the flow direction changes the dynamics of the valve operation. While it can help manage certain process issues, it can also introduce new problems like increased unbalanced forces and potential instability.
Stability Issues: During initial testing or under non-standard operating conditions, the valve may experience oscillation and noise if operated at small openings for extended periods. This can lead to premature failure of the valve core.
Process Conditions: Under normal operational conditions, the valve operates at moderate to full openings, mitigating many of the issues seen during startup or testing phases.
3. Long-Term Small Opening
Avoid Long-Term Small Openings: When using the valve in reverse, it is particularly important to avoid operating it at very small openings for extended periods to prevent excessive wear and potential damage.
Trial Production Stage: During the early stages of a plant's operation, when loads are typically lower and process conditions may not yet be stable, extra caution is needed. The valve should ideally be kept open at a moderate level to avoid prolonged periods of small openings.
General Recommendation
While the reverse use of angle control valves can offer benefits in specific challenging applications, it is generally advisable to use them in the forward direction unless there are compelling reasons to do otherwise. Careful consideration of the process conditions and operational requirements will help determine the best approach for each application. Regular maintenance and monitoring can further enhance the valve's performance and longevity.
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