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.
Key words:
Classification:
Ductile iron valve series
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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