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Pressure relief/holding 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

The 500X pressure relief/holding valve is mainly used in fire fighting or other water supply systems to prevent system overpressure or maintain the pressure of the fire fighting water supply system. The impact of water hammer can also be reduced when the fire pump is turned off. It is also used for water hammer elimination devices in large water supply systems. And the inlet valve control system is equipped with a self-cleaning filter, the use of fluid characteristics, so that the proportion of larger, larger diameter suspended particles will not enter the control system, to ensure that the system circulation unimpeded, so that the valve can operate safely and reliably. The system is stable, high strength and long service life. Suitable for pipes below DN600mm diameter.

◆ 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 215 240 255 290 310 360 430 510 600 630 700 742 775 925 1100 1210
PN1.6MPa 215 240 255 290 310 360 430 510 600 630 700 742 775 925 1100 1210
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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