Structural principle of single seat regulating valve

The straight through single seat regulating valve is composed of parts such as valve body, valve seat, valve core, guide sleeve, valve cover, valve stem, and packing. The valve core and valve stem are connected together. The connection method can be fixed with interference fit pins or threaded connection pins, or the valve stem and valve core of the valve station can be integrated and driven out. A guide sleeve is installed between the valve cover and valve body to guide the upward and downward movement of the valve core. The small hole on the guide sleeve connects the inner chamber of the valve body and the outlet end of the valve. The medium on the guide sleeve can easily flow into the valve outlet through a small hole, without affecting the movement of the valve core. The valve body of a straight through single seat regulating valve has only one valve core and one valve seat. The characteristic is small leakage and easy to ensure sealing. There are adjustable and cut-off types in structure. Their difference lies in the shape of the valve core. The shape of the regulating valve core is a plunger shape; The shape of the cut-off type valve core is flat or conical, and another characteristic of it is that the medium exerts a large force on the valve core, that is, the imbalance force is large, especially in situations with high pressure difference and large diameter, so it is only suitable for situations with low pressure difference.

The working principle of a single seat regulating valve is that when the valve core is in the closed state, the fluid in the pipeline is blocked. When the control signal reaches the valve, the valve core begins to open, and the fluid begins to flow. The opening of the valve changes with the change of the control signal.