300X relief valve closed at the pump outlet is installed in high-rise building water supply systems and other water supply system to prevent the media back, water hammer and water hammer phenomenon of intelligent valve. This valve combines electric valve, check valve and water hammer eliminator meal three functions, which can effectively raise the safety and reliability of water supply systems providers. And the slow opening, fast closing, slow closing to eliminate water hammer principle of integration of technology to prevent water hammer and pump Water hammer generation. Just pump motor hoist operation button, you can automatically open and close valves in accordance with the rules pumps, flow, pressure loss. Applies to the valve bore 600 below.