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Silent 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

DRVZ silent check valve is mainly composed of valve body, valve seat, guide fluid, valve disc, bearing and spring and other major parts, the internal flow passage using streamlined design pressure loss is very small. The valve flap has a short opening and closing stroke and can be quickly closed when the pump is stopped to prevent huge water hammer sound. It has the characteristics of silent closing. Mainly used for water supply and drainage, fire protection, HVAC system can be installed at the pump outlet to prevent back flow and water hammer damage to the pump.

◆Technical parameters

Product Model DRVZ
Nominal diameter 2"-12"(DN50-DN300)
Nominal pressure PN10/16/25
Applicable media Clear Water
Applicable temperature -10 ℃ ~ 80 ℃

 

 ◆ Material of main parts

Part Name Material Part Name Material
Valve body GJS 500-7 Gasket EPDM
Disc GJS 500-7 EPDM Disc Nut AISI 304
Spring AISI 304 Guide sleeve C61900
O-ring NBR conductor GJS 500-7
Stem AISI 304    

 

◆ Main outline connection dimension

Nominal diameter L D D1 N-Fd
DN(mm) NPS(in) PN10 PN16 PN25 PN10 PN16 PN25 PN10 PN16 PN25
50 2" 150 165 165 165 125 125 125 4-F19 4-F19 4-F19
65 2.5" 170 185 185 185 145 145 145 4-F19 4-F19 8-F19
80 3" 180 200 200 200 160 160 160 8-F19 8-F19 8-F19
100 4" 190 220 220 235 180 180 190 8-F19 8-F19 8-F23
125 5" 200 250 250 270 210 210 220 8-F19 8-F19 8-F28
150 6" 210 285 285 300 240 240 250 8-F23 8-F23 8-F28
200 8" 230 340 340 360 295 295 310 8-F23 12-F23 12-F28
250 10" 250 395 405 425 350 355 370 12-F23 12-F28 12-F31
300 12" 270 445 460 485 400 410 430 12-F23 12-F28 16-F31

Note: The flange size in this table is in accordance with GB/T17241.6 standard, and the structure length is in accordance with GB/T 12221-2005 standard.

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