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Hydraulic control valves are automated valves that precisely regulate fluid dynamics through hydraulic actuation. These valves operate on the principle of using liquid pressure (typically water or oil) to drive an actuator, which controls spool displacement to adjust flow rate, pressure, or direction of the medium within a pipeline. Integrating a pilot control mechanism, main valve body, and hydraulic circuit, hydraulic control valves feature self-feedback and dynamic response capabilities. These valves perform remote/automated fluid management in complex systems, serving as critical control components in industrial automation.

The contact pressure generated by the compression deformation of the rubber ring acts as a self-sealing, and the hard rubber part of the rubber ring acts as a fixed centering function. The interface can be deflected to adapt to a certain foundation settlement and achieve long-distance steering installation.

The sealing principle of the GT type interface of GT type ductile iron pipe is similar to that of the T type interface. As the internal pressure of the pipeline increases, the tighter the contact surface between the rubber ring sealing sleeve and the socket, the better the sealing effect.

The self-anchored ductile iron pipe adopts a special mechanical design to weld the ring to the socket end to achieve reliable anchoring performance, while retaining the flexibility of the joint, with good flexural performance, which can replace the function of the constraint block and realize the design without constraint blocks.

The emergence of horizontal drill rod technology avoids road excavation and damage to other underground pipelines, reducing users' trenchless costs. At the same time, underground pipelines have less impact on traffic and the environment. In addition, it can run underground. In recent years, it has been widely used in the construction of underground pipelines such as municipal, industrial, and electric power. Horizontal drill rods are suitable for medium and small diameter ductile iron pipes.

The main application area is the municipal sewage pressure pipe network with high anti-corrosion requirements. Sewage treatment plants have certain requirements for pressure resistance, and the medium contains polyphenols and cyanide, which are corrosive substances that may harm the industrial sewage pipe network system.