Logic valves in the practical application of the selection and precautions

When selecting a logic valve, the system should be designed based on the required flow rate. For flows greater than or equal to 200 liters per minute, a two-way cartridge valve is recommended. However, for flows below 20 liters per minute, a threaded cartridge logic valve is more appropriate. Cartridge valves come in different configurations, including those with and without a tail. The tail version often includes features like buffer and throttle functions, which can help control the system's performance. There are various options available for the valve core area ratio, allowing for flexibility in adjusting the valve's response characteristics. Similarly, the spring stiffness can be selected to achieve different opening pressures, which is essential for precise control. Some domestic plug-in components use O-rings between the spool and the valve sleeve, ensuring good sealing. However, this design may affect the response speed of the valve. The control cover and spool contain damping holes of various diameters. Larger damping holes result in slower response but reduce impact, while smaller holes increase the reaction speed but may lead to higher pressure fluctuations. If the logic valve’s operation could significantly affect the system’s function, it is crucial to carefully select the orifice diameter to ensure stability and efficiency. There are multiple types of control covers available, and each should be chosen based on the specific requirements of the system. When designing the valve block, it is important to mark the positioning holes on the cover and assign unique codes to each port for ease of assembly and maintenance. The selection of the valve must also consider the system's flow rate, pressure, and the flow-pressure curve. Choosing a valve that is too small may cause excessive pressure loss and overheating, while a valve that is too large can lead to unnecessary size and economic inefficiency. Logic valves offer two types of sealing materials: fluorine rubber seals, which are suitable for phosphate ester-based fluids, and nitrile rubber seals, ideal for mineral oil systems. Due to their ability to handle high pressure and large flow rates, logic valves are particularly well-suited for rapid hydraulic actuation. Both domestic and international manufacturers have developed mature logic valve products, and their application in high-speed hydraulic systems shows great potential.

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