The cast iron swing gate is a hydraulic control device that achieves opening and closing through bidirectional rotation, primarily used for irrigation and flood discharge control at the bottom outlets of reservoir dams. Its core features include:
Structural Characteristics
Constructed from HT200 cast iron, equipped with a dual sealing structure comprising a rubber soft sealing ring and a metal water-stop auxiliary, limiting forward seepage to within 0.7L/min·m. The bidirectional rotation mechanism utilizes an L-shaped guide rail to enable sliding connection between the gate plate and the mounting plate, working in conjunction with a reset spring and sloped groove to ensure sealing effectiveness.
Technical Parameters
Covers PZ and PYZ series, with inlet diameters ranging from Φ200 to Φ1200 across 8 specifications. The opening/closing force is adjustable within 1-2T, and the opening/closing speed ranges from 0.2-1.5m/min. Supports a maximum medium temperature of 30°C, with an ambient temperature adaptability range of -20°C to 120°C.
Installation and Maintenance
Must be installed with a slope ≤30° to the horizontal plane, using secondary pouring technology to fix the base. Post-installation requires no-load opening/closing tests and a 10-meter head load test. Routine maintenance involves applying grease to rotating parts quarterly to prevent rust, and pausing turbulent flow to flush debris before closing.
Application Scenarios
Widely used for water release control at reservoir bottom outlets, operated with hand-electric dual-purpose hoists to enable bidirectional adjustment for irrigation and flood discharge. Particularly prevalent in reservoir projects in regions such as Yunnan and Guizhou.