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Using a flexible hose between the valve and cylinder in a hydraulic system can lead to significant drawbacks and compromises in control efficiency. This practice undermines the precision and reliability of the system in several key ways.
Firstly, flexible hoses introduce compliance and elasticity into the hydraulic circuit. Unlike rigid piping, hoses can expand and contract under pressure, causing delays and inaccuracies in the transmission of hydraulic fluid between the valve and cylinder. This elasticity can result in a lag between the control signal sent to the valve and the actual movement of the cylinder, leading to poor responsiveness and control accuracy.
Secondly, flexible hoses are prone to temperature variations and mechanical wear over time. As hydraulic fluid flows through the system, it generates heat, causing the hose material to expand and contract. This thermal expansion can further exacerbate the compliance of the hose, exacerbating control issues and making tuning more difficult.
Additionally, flexible hoses are susceptible to abrasion, punctures, and leaks, especially in high-pressure hydraulic systems. Any damage to the hose can result in fluid loss, reduced system efficiency, and potential safety hazards.
However, there is an exception to the no hose rule: if the valve cannot be mounted on the cylinder, and the cylinder ports move relative to the valve, a short section of hose is required. Use only the minimum length of hose as required for flexion. The rest of the distance between the valve and cylinder should be rigid piping. We have encountered situations where hose was both unavoidable and caused control issues. Fortunately, Delta Motion’s controllers include algorithms to counteract the reduced natural frequency caused by hose. However, the best control is still achieved by using no hose between the cylinder and valve.
Using rigid piping between the valve and cylinder ensures minimal compliance and maximum responsiveness in the hydraulic system. Rigid piping maintains precise control over fluid flow, minimizes pressure drops, and enhances the overall stability of the system.
In conclusion, avoiding the use of flexible hoses between the valve and cylinder is crucial for maintaining optimal control efficiency and system performance in hydraulic applications. By opting for rigid piping whenever possible, engineers can mitigate compliance issues, simplify tuning processes, and ensure reliable operation of the hydraulic system over the long term.
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