Employing a balanced structure, the unbalanced force generated by the pressure difference of the medium before and after the valve on the valve disc is very small. Under the same operating conditions, the actuator thrust required for similar valves is smaller, thus allowing for a smaller valve stem diameter compared to single-seat unbalanced valves.
The friction between the valve stem and packing is relatively low, reducing valve actuation resistance and minimizing wear on both, resulting in increased service life. Furthermore, the smaller diameter valve stem experiences less thermal expansion and contraction at medium and high temperatures, preventing increased friction or jamming between the valve stem and packing at these temperatures.
Because the new sleeve valve has a balanced structure, compared to unbalanced straight-through single-seat valves, a smaller actuator can be configured, yet it can overcome higher medium pressure differences. For example, the new sleeve control valve with diameters of DN200/DN250/DN300 only requires a C60 cylinder actuator, eliminating the need for a larger cylinder actuator. At the maximum valve seat diameter, the permissible working differential pressure is approximately twice that of a similarly configured straight-through single-seat control valve. Diaphragm actuators and explosion-proof electric actuators are also available.
The new sleeve control valve adopts a self-centering, threadless snap-in seat structure and modular design, making valve assembly and disassembly convenient, and achieving leakage standards of Class IV or higher.
Below 150℃, the metal hard seal can achieve leakage standards of Class IV or higher, and the PTFE soft seal can achieve Class VI leakage standards. The service life of the new sleeve control valves with DN200/DN250/DN300 is longer than that of the straight-through single-seat control valve.
For the new sleeve control valve with DN80 and above, the geometric dimensions and tolerances of the adjustment range should conform to the drawing requirements.