Dynamic balance electric control 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.
◆Technical parameters
EDRV dynamic balance electric control valve is different from the traditional electric control valve of a new generation of products, is the integration of dynamic balance and electric regulation products.
In a variable flow system with large system load fluctuations, when the system pressure changes, the pressure difference (P1-P3) at both ends of the dynamic balance electric control valve also changes:
(1) When the inlet pressure P1 rises,(P1-P2) increases, then the electric valve spool moves upward, reducing the opening between P1 and P2, and the spool pressure P2 decreases; When the inlet pressure P1 decreases,(P1-P2) decreases, then the electric valve spool moves downward, increasing the opening between P1 and P2, and the spool pressure P2 increases. Therefore, no matter how the pressure of the system changes, the pressure difference between P2 and P3 remains unchanged through the adjustment of the electric valve spool. Therefore, the anti-interference ability of this valve is strong, with the function of dynamic balance;
(2) When the straight-stroke electric actuator receives the control signal to make the valve shaft move up and down along AB (or the angular-stroke electric actuator receives the control signal to make the valve shaft rotate along R), the opening between P2 and P3 also changes accordingly. Since no matter how the system pressure difference (P1-P3) changes, the pressure difference (P2-P3) between P2 and P3 is always the same, so the water flow rate corresponding to any opening position is certain, and the actual flow characteristic curve of the electric control valve is consistent with its ideal flow characteristic curve, without deviation. Therefore, the electric control valve has better regulation characteristics than the traditional electric control valve.
◆ Flow characteristic curve of dynamic balance electric control valve
The dynamic balance of electric control valve flow (opening)-pressure curve
◆Technical parameters
| Model | Valve form | DN(mm) | Differential pressure range (KPa) | Flow range (m³/h) | Working pressure | flow error | Fluid temperature |
| A/D-EDRV1 | Two-way | 25 | 30-300 | 0.2-2.9 | PN16 | 5% | 0-100 ℃ |
| A/D-EDRV2 | 32 | 30-300 | 0.5-4.7 | ||||
| A/D-EDRV3 | 40 | 30-300 | 1-7.7 | ||||
| A/D-EDRV4 | 50 | 30-300 | 2-12.1 | ||||
| A/D-EDRV8 | 65 | 30-300 | 3-20.4 | ||||
| A/D-EDRV9 | 80 | 30-300 | 5-30.8 | ||||
| A/D-EDRV10 | 100 | 30-300 | 10-45.3 | ||||
| A/D-EDRV11 | 125 | 30-300 | 15-70.7 | ||||
| A/D-EDRV12 | 150 | 30-300 | 20-101.8 | ||||
| A/D-EDRV13 | 200 | 33-300 | 5.0-360 | ||||
| A/D-EDRV14 | 250 | 22-210 | 4.0-460 |
◆ Material of main parts
| Part Name | Valve body | Valve sleeve | Spool | Electric actuator housing |
| Material | ductile iron | Stainless Steel | Brass | Aluminum alloy |
◆ Main outline connection dimension
| Model | Valve form | DN(mm) | L | H1 | H2 | D Flange | G thread |
| A/D-EDRV1 | Two-way wire mouth | 25 | 160 | 265 | 70 | / | G1 |
| A/D-EDRV2 | 32 | 180 | 275 | 70 | / | G1-1/4 | |
| A/D-EDRV3 | 40 | 300 | 290 | 90 | / | G1-1/2 | |
| A/D-EDRV4 | 50 | 300 | 290 | 90 | / | G2 | |
| A/D-EDRV5 | Two-way flange | 32 | 160 | 220 | 70 | 100 | / |
| A/D-EDRV6 | 40 | 200 | 235 | 110 | 110 | / | |
| A/D-EDRV7 | 50 | 215 | 230 | 115 | 125 | / | |
| A/D-EDRV8 | 65 | 230 | 238 | 120 | 145 | / | |
| A/D-EDRV9 | 80 | 275 | 275 | 146 | 160 | / | |
| A/D-EDRV10 | 100 | 290 | 295 | 165 | 180 | / | |
| A/D-EDRV11 | 125 | 315 | 307 | 208 | 210 | / | |
| A/D-EDRV12 | 150 | 350 | 326 | 205 | 240 | / | |
| A/D-EDRV13 | 200 | 430 | 715 | 295 | 295 | / | |
| A/D-EDRV14 | 250 | 520 | 740 | 345 | 355 | / |
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