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I. Pengantar:
ZDLSY Electric Special Regulating Valve for Drainage is a new generation of steam trap designed and produced based on the drainage needs of thermal power plant equipment; it consists of two parts: electric actuator and angle-type valve body. Its internal structure has no dead corners, the valve core and valve seat are made of integral hard alloy, with advantages such as internal leakage ≤ Class VI when closed, high accuracy of flow characteristics, etc. The product adopts a nearly linear valve core design to reduce flow resistance, and applies the principle of two-stage throttling to reduce erosion and extend service life. Powered by an electric actuator, it receives 0-10mA or 4-20mA DC signals according to the controlled parameters of the control system, automatically adjusts the valve opening to achieve continuous regulation of process parameters such as pressure, flow rate, and liquid level of the fluid in the pipeline, and can receive remote DCS signals. This product features sensitive operation and precise signal transmission; it is widely used in industrial automation control systems such as electric power, metallurgy, chemical industry, light textile, etc., and has been widely applied in the industrial field.
II. Materials of Components:
Valve body, valve cover: HT200, ZG230~450, ZG1Cr18Ni9Ti
Valve core, valve: 1Cr18Ni9Ti, Stellite alloy surfacing
Stuffing core: Polytetrafluoroethylene (PTFE), flexible graphite, stainless steel bellows
Push rod, bushing: 2Cr13
III. Application:
It is composed of 381L series electronic electric actuator and three-way regulating mechanism. The electric actuator has a built-in servo system, no need for an additional servo amplifier, and can be controlled to operate as long as there is an input signal and power supply, with simple wiring. The regulating mechanism has two operation modes: confluence and diversion, and in some occasions, it can replace two two-way valves and one three-way connection, thus being widely applied. It is commonly used for two-phase regulation of heat exchangers and simple ratio regulation.
IV. Technical Parameters:
Nominal Diameter DN | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 |
Flow Coefficient | 5 | 8 | 12 | 17 | 29 | 43 | 70 | 110 |
Rated Stroke (mm) | 16 | 25 | 40 | |||||
Nominal Pressure PN | 150LB (2.0MPa) -- 1500LB (25.0MPa) | |||||||
Working Temperature | -445 | |||||||
Signal Range | 4-20mADC, 200VAC, 380VAC | |||||||
Power Supply | 220VAC 50HZ, 380VAC 50HZ, 60HZ | |||||||
Allowable Leakage | Approximately zero leakage | |||||||
Sensitivity | (0.5-5%) F.S | |||||||
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