Valve device and electric valve

A valve device, comprising a coil assembly and a valve component, wherein

• the valve component comprises a valve seat component, a rotor component, a valve core component and a sleeve,
• the coil assembly comprises a stator assembly, and the stator assembly is configured to drive the rotor component to rotate,
• the valve core component is connected to the rotor component, and the rotor component is configured to drive the valve core component to axially move relative to the valve seat component,
• the valve seat component comprises a valve seat sleeve and a flange portion, and a lower end opening portion of the sleeve is fixed to the valve seat sleeve by welding,
• the valve device further comprises a mounting block, and the valve device is mounted to other elements through the mounting block,
• the mounting block is further provided with a mounting hole, and a part of the valve seat component is located inside the mounting hole, wherein a hole diameter of at least a part of the mounting hole is smaller than an outer diameter of the flange portion, and the flange portion is configured to limit the mounting block from being separated from the valve seat component in a direction away from the coil assembly,
• the valve device further comprises a gasket, and at least a part of the gasket is radially located between the valve seat sleeve and an inner circumferential wall of the mounting hole, wherein the gasket is tightly pressed between the mounting block and the valve seat component in an interference fit to limit the valve seat component from rotating relative to the mounting block in a circumferential direction,
• wherein the gasket covers a position where the lower end opening portion of the sleeve and the valve seat sleeve are welded.