The electric sleeve control valve consists of a 3810L type (or PSL series) linear-stroke electronic electric actuator and a compact sleeve valve. It incorporates a servo function, accepting a standardized 4-20mA or 1-5V DC signal, converting the current signal into a corresponding linear displacement, and automatically controlling the valve opening to achieve continuous regulation of process parameters such as pressure, flow rate, temperature, and liquid level of the fluid in the pipeline.
The sleeve and valve disc of the sleeve control valve have a clearance fit. Multiple throttling windows are opened on the sleeve; the shape of the windows determines the flow characteristics of the control valve, and the size of the window area affects the flow coefficient Cv of the control valve. The valve seat adopts a self-centering, threadless snap-fit structure. The conical sealing surface on the valve seat mates with the conical sealing surface on the valve disc to form a shut-off sealing pair, ensuring that the valve is tightly closed when the valve disc is pressed against the valve seat. The diameter of the valve seat affects the flow coefficient Cv of the control valve. The valve disc has symmetrically distributed balance holes parallel to the axial direction, connecting the chambers on the upper and lower end faces of the valve disc. This allows most of the forces exerted by the medium on the valve disc along the axial direction to cancel each other out, resulting in very small unbalanced forces on the valve stem. The sleeve has a PTFE balance seal. When the valve disc is fully closed, the balance sealing surface on the valve disc presses tightly against the PTFE balance seal on the sleeve, forming a tight seal and preventing the medium in the upper chamber from entering the balance chamber. When the valve disc moves up and down, the channel area of the throttling window on the sleeve changes, thereby regulating the flow rate and pressure of the medium in the pipeline.