How does the hose burst valve ensure that the bidirectional flow of the hydraulic system is not affected during normal operation?

The hose burst valve ensures that the hydraulic system can achieve bidirectional flow without interference through its unique structural design and fluid dynamics mechanism during normal operation. The valve adopts a separate valve plate or valve disc structure, and the valve port is maintained open by the spring preload. In a typical design, the spring on the center rod separates the valve disc from the flow block to form a stable fluid channel. This structure allows the hydraulic oil to flow freely in both directions when there is no abnormal flow, with only a slight pressure drop. Some models are controlled by the precision-machined valve disc and valve body separation gap, allowing bidirectional flow between ports, and the pressure loss is controlled within the range of 0.2-0.5 MPa.
During the bidirectional flow process, the valve achieves pressure balance through a symmetrical flow channel design and a damping hole structure. The valve plate maintains the valve port opening under the action of the spring force. When the oil flows forward, the pressure difference generated by the flow resistance is not enough to overcome the spring preload; when it flows in the reverse direction, the flow velocity sensitivity is reduced through a specially designed throttle hole (such as a calibrated orifice) to avoid normal flow triggering closure. Some high-end models use a flat seat valve design, whose flow cross-sectional area matches the system piping to ensure that no significant pressure difference will be caused when the flow rate falls below the preset threshold.
The start-up flow threshold is limited by physical structure or preset orifice size. In a typical design, the burst flow is set by adjusting specific sizing parameters, which need to be verified during the system commissioning phase and are usually set to 120%-150% of the system's maximum flow. Industry-standard valves achieve flow tolerance control through standardized components and can maintain bidirectional flow even under dynamic pressure fluctuations.
Key moving parts are lightweight to reduce inertia effects. The mass of the valve plate is carefully calculated to ensure that the fluid force cannot overcome the spring stiffness at normal flow rates, and only generates enough momentum to trigger closure when the abnormal flow rate increases suddenly. Some models use low friction coefficient materials to keep the valve disc response delay within 10 milliseconds to avoid false operation caused by normal flow fluctuations.
By optimizing the flow path geometry (such as progressive inlet and streamlined valve core), the valve minimizes pressure loss during normal flow. At a working pressure of 350 bar, the bidirectional pressure drop of a high-quality valve does not exceed 0.3% of the system pressure, which has almost no impact on the efficiency of the pump station. Valves that meet the needs of precision control maintain pressure loss below 0.1 MPa in dynamic operation through special flow channel design.
A composite structure of metal-to-metal seal and elastomer auxiliary seal is adopted. In a typical design, a trivalent chrome-plated carbon steel valve seat and a spring-loaded valve disc form the main seal, supplemented by a nitrile rubber ring to compensate for microscopic leakage. This structure can withstand high-pressure shocks in bidirectional flow and maintain an internal leakage of less than 0.01 L/min in long-term use. Some models use a hardened flat valve plate, and the friction coefficient is reduced to less than 0.05 through a mirror polishing process to ensure that the valve plate can be freely reset during frequent reversing.
Some high-end models are equipped with a dynamic flow sensing module to adjust the spring preload by real-time monitoring of flow changes. When the system flow is detected to be close to the set threshold, the valve will slightly increase the flow channel cross-sectional area to delay the closing trend. This active adjustment mechanism is particularly suitable for scenarios with frequent load changes, and can improve the stability of bidirectional flow by more than 30% without sacrificing safety.