ZDLN Electronic Electric Double-seat Regulating Valve
I. Introduction:
The ZDLN electronic electric double-seat control valve consists of a 3610L series electronic electric actuator and a low-flow-resistance straight-through single-seat regulating mechanism. The electric actuator has a built-in servo system, eliminating the need for an external servo amplifier. It can be controlled to operate simply by connecting an input signal and a power supply. It features small size, light weight, large flow rate, and high regulation accuracy. It is widely used in automatic control of industrial processes such as petroleum, chemical, metallurgy, and light industry. It is widely used to maintain process parameters such as pressure, flow, temperature, and liquid level of media like gas, liquid, and steam at given values, and is a general control valve product that meets IEC standards. The double-seat valve has characteristics such as small unbalanced force, allowable large pressure difference, and large flow capacity, making it suitable for clean media applications where leakage requirements are not strict and pressure differences are large. It is widely used in industries such as electric power, metallurgy, chemical, petroleum, environmental protection, light industry, and equipment.
II. Working Principle:
The ZDLN electronic electric double-seat control valve has a larger flow rate than an electric single-seat control valve of the same nominal diameter, because the double-seat control valve has two valve cores (upper and lower) on its valve seats. The medium flows in from the left side of the valve body, passes through the valve seats and valve cores, and flows out from the right side. Its flow capacity can be increased by 20% to 25% compared with a single-seat valve. When the electric double-seat control valve is in use, the forces exerted by the medium on the upper and lower valve cores can cancel each other out, resulting in a small unbalanced force and a large operating pressure difference. However, since the upper and lower valve cores are not easy to close tightly at the same time, the leakage amount when closed is relatively large. But because of its strong flow capacity and allowable pressure difference larger than that of a general control valve, it is suitable for occasions with requirements for leakage amount and large pressure difference.
III. Performance Indicators:
Performance Indicators | ||
Item | Indicator Value (with positioner) | |
Basic Error (%) | ±5.0 | |
Hysteresis (%) | 2.0 | |
Dead Band (%) | 3.0 | |
End Point Deviation (%) | ±2.5 | |
Rated Stroke Deviation (%) | ±2.5 | |
Leakage (1/h) | Single-seat Type | 10⁻⁴ × Rated Capacity of Valve |
Sleeve Type | 10⁻³ × Rated Capacity of Valve | |
IV. Main External Dimensions and Connection Sizes:
Nominal Diameter | L | H1 | H | H2 | D | H3 | |||||||||||
Normal Temperature | Medium Temperature | ||||||||||||||||
PN6 | PN16 | PN40 | PN64 | PN6 | PN16 | PN40 | PN64 | PN6 | PN16 | PN40 | PN64 | PN40 | PN64 | ||||
20 | 187 | 194 | 194 | 206 | 45 | 52.5 | 52.5 | 62.5 | 539 | 546.5 | 546.5 | 556.5 | 696.5 | 706.5 | 205 | 225 | 100 |
25 | 184 | 197 | 197 | 210 | 50 | 57.5 | 57.5 | 67.5 | 556 | 563.5 | 563.5 | 573.5 | 713.5 | 723.5 | 260 | 225 | 130 |
40 | 222 | 235 | 235 | 251 | 65 | 72.5 | 72.5 | 82.5 | 713 | 720.5 | 720.5 | 730.5 | 890.5 | 900.5 | 260 | 225 | 158 |
50 | 254 | 267 | 267 | 286 | 70 | 80 | 80 | 87.5 | 721 | 731 | 731 | 738.5 | 901 | 908.5 | 260 | 225 | 163 |
65 | 276 | 292 | 292 | 311 | 80 | 90 | 90 | 100 | 835 | 845 | 845 | 855 | 1025 | 1035 | 370 | 310 | 194 |
80 | 298 | 317 | 337 | 337 | 92.5 | 97.5 | 97.5 | 105 | 859.5 | 864.5 | 864.5 | 872 | 1044.5 | 1052 | 370 | 310 | 203 |
| Machinery & Equipment/Valves/Control Valves | |
