Advantages of low-flow control valves

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As the name implies, a low-flow control valve is suitable for regulating very small flow rates; it should be used in situations where a small amount of additive needs to be added during processes such as those in the petroleum and chemical industries. The minimum flow capacity of ordinary control valves is 0.08, while that of low-flow control valves can go as low as 0.05–0.0012. The structure of a low-flow control valve consists of components such as a valve cover, valve body, valve seat, valve core, packing, and gland nuts. Its spool is of conical or cylindrical slotted design (the flow area between the spool and the seat is adjusted by varying the depth of the slots), and the key factor lies in the machining precision of the spool and the seat; its other structural principles are the same as those of ordinary straight-through single-seat control valves. Advantages of low-flow control valves: Low-flow control valves are top-guided single-seat control valves that feature a simple structure, good sealing performance, and reliable operation. An effective and sufficient top guidance system overcomes vibrations at small opening angles, ensuring a longer effective service life. Choosing a smaller flow coefficient increases the versatility of this valve, allowing the use of options such as multi-spring pneumatic diaphragm mechanisms or electric actuators.