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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.

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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.

◆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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