T968Y Intelligent Electric Control Valve
I. Introduction:
To improve the economic efficiency of power plants, steam turbines are equipped with a regenerative system, which is installed with high and low pressure heaters. To ensure that the heaters operate with water level and prevent the steam from the previous stage of the turbine from flowing into the next stage when the heaters operate without water level, which would reduce the turbine efficiency and equipment safety, a drain control valve is installed in the drain system of the heater. It automatically adjusts the opening of the drain control valve according to the water level signal of the heater, so that the water level of the heater is always maintained within a certain range. The working conditions of the drain control valve are very poor, and in many cases, it works under two-phase fluid (i.e., steam-water mixture state), and it also operates under throttling conditions, resulting in severe cavitation. When cavitation reaches a certain level, the drain control valve will no longer function properly. Under such circumstances, the heater cannot maintain operation with water level, thus reducing the economic efficiency of the turbine operation. Therefore, it is particularly important to select a drain control valve with small cavitation, low noise, simple structure and reliable performance.
II. Part Materials:
Valve body, valve cover: HT200, ZG230-450, ZG1Cr18Ni9Ti
Valve core, valve seat: 1Cr18Ni9Ti, Stellite alloy hardfacing
Valve stem, push rod: 2Cr13, 1Cr18Ni9Ti
Bushing: 2Cr13
Packing: Polytetrafluoroethylene (PTFE), flexible graphite, stainless steel bellows
III. Technical Parameters:
Nominal Diameter DN (mm) | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | ||||
(10) | (12) | (15) | (20) | ||||||||||||||
Rated Flow Coefficient Kv | Linear | 1.8 | 2.8 | 4.4 | 6.9 | 11 | 17.6 | 27.5 | 44 | 69 | 110 | 176 | 275 | 440 | 690 | 1100 | 1760 |
Equal Percentage | 1.6 | 2.5 | 4.0 | 6.3 | 10 | 16 | 25 | 40 | 63 | 100 | 160 | 250 | 400 | 630 | 1000 | 1600 | |
Rated Stroke L (mm) | 10 | 16 | 25 | 40 | 60 | 100 | |||||||||||
Built-in Flow Characteristic | Linear, Equal Percentage | ||||||||||||||||
Built-in Rangeability R | 50:1 | ||||||||||||||||
Allowable Leakage | Hard Seat: Class IV, Soft Seat: Class VI | ||||||||||||||||
Nominal Pressure PN (MPa) | 1.6, 4.0, 6.4 | ||||||||||||||||
Working Temperature t (℃) | Normal Temperature Type | -20～200, -40～250, -60～250 | |||||||||||||||
Heat Dissipation Type | -40～450, -60～450 | ||||||||||||||||
High Temperature Type | 450～560 | ||||||||||||||||
Low Temperature Type | -60～-100, -100～-200, -200～-250 | ||||||||||||||||
| Machinery & Equipment/Valves/Control Valves | |
