Water System Special Cast Steel Flange Gate Valve. Valves designed with this connection type feature a bolted connection between the valve body and bonnet, with spiral-wound gasket sealing, offering the advantage of easy maintenance. The second type is the forged steel extended end gate valve with welded body-bonnet connection. Valves designed with this connection type have the valve body and bonnet fully welded for sealing, providing the advantage of no external leakage. The third type is the pressure self-sealing bonnet forged steel extended end gate valve. Valves designed with this connection type

Water System Special Cast Steel Flange Gate Valve utilizes hydraulic force for automatic operation, controlling and adjusting the main valve opening to maintain a constant flow rate through the main valve. Working principle: When water is supplied from the inlet end, it flows through the needle valve into the main valve control chamber, and then exits the main valve control chamber to the outlet via the pilot valve and ball valve, keeping the main valve fully open or in a floating state. By adjusting the flow control valve on the upper part of the main valve,

  a specific opening degree can be set for the main valve. Adjusting the needle valve opening and the pilot valve spring pressure ensures the main valve opening remains at the set degree, with the pilot valve automatically adjusting during pressure changes to maintain a constant flow rate. Features: ☆ This product utilizes hydraulic self-control, requiring no additional devices or energy sources, offering easy maintenance and stable flow control. ☆ This series of valve products is widely used in water supply network systems such as high-rise buildings, residential areas, and urban water supply projects.