Structural Characteristics of Electric Sleeve Control Valve

The electric sleeve control valve is a high-performance electric regulating valve. By simply replacing the sleeve, different flow coefficients and different flow characteristics can be achieved. It combines the advantages of single and double seat valves. In terms of stability, lifespan, installation and maintenance, it is superior to single and double seat valves. Therefore, it has become the mainstream of regulating valves and is suitable for various fluids under different pressures and temperatures, as well as in working environments with strict requirements for leakage. 

Structural features of the electric sleeve regulating valve:
1). The electric sleeve regulating valve can be easily replaced with a straight flow characteristic sleeve or an equal percentage flow characteristic sleeve according to the requirements of different flow characteristics. It can also be replaced with sleeves of different flow capacities as the flow changes.

2). The leakage of the electric sleeve regulating valve is less affected by high-temperature conditions. Unlike the double-seat regulating valve, which experiences a significant increase in leakage in high-temperature conditions, because the sleeve and the valve core are made of the same material, have similar shapes, and have the same expansion coefficient, the deformation is similar at high temperatures, so the leakage change is not significant. (The valve core and valve seat of general regulating valves are not made of the same material, so the leakage will increase with the increase in temperature.)
3). Its stability is better than that of the double-seat regulating valve. When the opening of the double-seat regulating valve exceeds 60-70%, an unstable zone will occur, causing valve core oscillation. The electric sleeve regulating valve does not have an unstable zone and will not experience a reverse phenomenon of unbalanced force. At the same time, the guiding parts of the valve core and sleeve are large, so there will be no oscillation.

4). The sleeve is pressed onto the valve body through the upper valve cover. Unlike single and double-seat valves, where the valve seat is connected to the valve body by threads, the disassembly and assembly is very convenient. Moreover, when disassembling and assembling the sleeve, the valve body does not need to be removed from the pipeline. This is the most prominent advantage for instrument maintenance workers.
5). Since the bottom of the valve plug is a flat surface, when cavitation occurs, the shock waves generated by the bubble rupture act on the cavity below the valve plug. The impact energy is not applied to the valve plug but absorbed by the medium itself. In contrast, the impact energy of single and double-seat valves directly acts on the head of the valve core. Therefore, the damage caused by cavitation in the sleeve valve is less than that in single and double-seat valves. On the other hand, the sealing surface of the sleeve and the throttling surface (window) are separated. The high-speed flow of the medium over the seal is significantly reduced after being washed by the medium, so the service life of the sleeve valve is longer than that of single and double-seat valves.