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  • 缓闭式止回阀1.jpg
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Slow closing check valve

A valve is a mechanical device that controls the flow rate, flow direction, pressure, temperature, etc. of a flowing fluid medium. Valves are the basic components in piping systems. Valve fittings, like pumps in technology, are often discussed as a separate category.

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Classification:

Ductile iron valve series

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Description


A valve is a mechanical device that controls the flow rate, flow direction, pressure, temperature, etc. of a flowing fluid medium. Valves are the basic components in piping systems. Valve fittings, like pumps in technology, are often discussed as a separate category. The valve may be operated manually or with a hand wheel, handle or pedal, and may also be controlled to vary the pressure, temperature and flow rate of the fluid medium. The valve can perform continuous or repeated operations on these changes, such as safety valves installed in hot water systems or steam boilers. In more complex control systems, automatic control valves are used as required by external inputs (I. e., to adjust the changing set point of the flow through the pipeline). The automatic control valve does not need to be manually operated according to its input and setting, so that the valve can accurately control the various requirements of the fluid medium. Valves can also be divided into cast iron valves, cast steel valves, stainless steel valves, chromium molybdenum steel valves, chromium molybdenum vanadium steel valves, dual phase steel valves, plastic valves, non-standard customized valve materials, etc.

◆ Product overview

300X slow closing check valve is installed in the high-rise building water supply system and other water supply system of the pump outlet, to prevent the media back, water hammer and water hammer phenomenon of intelligent valve. The valve has three functions of electric valve, check valve and water hammer eliminator, which can effectively improve the safety and reliability of water supply system. The technical principles of slow opening, quick closing and slow closing to eliminate water hammer are integrated to prevent the generation of water hammer at pump start and pump stop. Just operate the pump motor opening and closing button, the valve can be automatically opened and closed according to the pump operating procedures, with large flow and small pressure loss. Suitable for valves below DN600mm caliber.

◆ Typical installation diagram

◆ Main outline connection dimension

Nominal diameter DN 50 65 80 100 125 150 200 250 300 350 400 450 500 600 700 800
 L     PN1.0MPa 241 234 280 360 430 455 585 790 900 900 962 962 1076 1232 1437 1750
PN1.6MPa 241 234 280 360 430 455 587 794 900 900 962 962 1076 1232 1437 1750
H1 152 145 167 232 288 342 413 502 600 600 685 685 880 1050 1225 1400
H 250 250 271 375 455 502 636 781 913 913 1035 1035 1300 1535 1793 2022

Note: The structure length in this table is based on CJ/T 219 standard.

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