The valve core is the valve part that realizes the basic functions of directional control, pressure control or flow control by means of its movement.

According to the movement method, it can be divided into rotary type (45°, 90°, 180°, 360°), translation type (radial, facing).

According to the shape, it can be generally divided into spherical (ball valve), conical (plug), round cake (butterfly valve and gate valve), dome type (globe valve and check valve), cylindrical (reversing valve)

As for the material of the valve core, bronze or stainless steel are generally the main materials, and there are also plastics, nylon, ceramics, glass, etc.

The valve core in the pressure reducing valve is one of the main components to control the pressure. The pressure reducing valve reduces the inlet pressure to a required outlet pressure through adjustment, and relies on the energy of the medium itself to keep the outlet pressure automatically stable. valve. From the point of view of fluid mechanics, the pressure reducing valve is a throttling element whose local resistance can be changed, that is, by changing the throttling area, the flow rate and the kinetic energy of the fluid are changed, resulting in different pressure losses, so as to achieve the purpose of decompression. Then rely on the adjustment of the control and adjustment system to balance the fluctuation of the pressure behind the valve with the spring force, so that the pressure behind the valve remains constant within a certain error range.