We process according to the system to expand stem valve selection explain it. Simplified, power flow chart is the cycle of water, steam flow, in this process was selected with stem valve is both simple and complex. Electric power is one of the most matter energy material industry, up to now have steam, wind, water power, geothermal, tidal power, sun power generation, this paper mainly discuss the fuel, foreign oil, gas and nuclear power stations in the selection of local typical stem valves. But first of all to think about problem is the safety of the pressure valve stem and reliable sex. To Marine valve and valve: flash scour resistance, V or VI level tightly closed, valve for failure. 6, reduce temperature reducing pressure valve ( High and low pressure bypass valve) Stem requirements: high temperature and high pressure steam debugging to a certain temperature and pressure steam; A supply for steam turbine bypass channel, boiler steam turbine independently and office. Working condition of things: medium is water, pressure difference is bigger, the valve requirements: a variety of types: nozzle type, and help atomization type, self including type and type to the clamp. 4, in addition to the oxygen water standard valve stem ( DALC) Stem requirement: water supply flow to keep the normal except oxygen device standard, after growth in steam temperature eliminate gas dissolved in the water. requirements: thermal shock, noise reduction, response speed. requirements: work during low flow resistance to cavitation, 5, desuperheating Industrial Valves ( Attemperator) Stem requirements: the high pressure water spewing into the steam to steam temperature curb demand. Working condition of things: high temperature and high pressure steam to reduce temperature to reduce the pressure. Working condition of things: the pressure drop of - 160 350 kilograms, is the largest power station system bear the pressure differential valve, flow average 30 to one hundred percent of normal flow. Selected for ordinary Industrial Valves failure, ( Demand note is common to dissolve to eliminate the oxygen in water will attend diammonium disposal, it will be the number SATELLITE6 alloy or other roughly similar initiation is bad, so it's best to not use 316 ways of disposal of surfacing STELLITE trims, can be directly choose 416 stainless steel material) 。 2, boiler feed water pump minimum flow circulation valve stem requirements: make the boiler feed water pump, the paper start work and operation, eliminate because flow is too small, temperature increase, water pump cavitation damage. 1, feed valve, deputy boiler feed water valve, compound feed water regulating valve stem requirements: stem boiler feed water, maintain the economic level and steam flow. 。 Shoulder point is this kind of plant water liquid gas to steam, use steam to drive a gas turbine help and initiation power generators, different point is the water into the steam energy substances differ, goodbye are: natural gas, fuel oil, carboniferous, atomic pile. requirements: body is made of WCB/WC9, for double valve system start to work in the valve requires the cavitation resistance, V level off, about the nature of the compound feed valve need to use special 'trims satisfied with normal operation of boiler to start working and at the same time demand. Simple process media is simple, only two kinds of water and steam and water is complicated and large range of steam temperature and pressure of the flap and bring a series of problems such as: flashing, cavitation, erosion, corrosion, noise. Working condition of things: medium to achieve the highest limit of water, heater stem valve pressure difference between the average is 6 - 30 kg, final level of trap straight adjacency agency condenser or in addition to the oxygen. requirements: resistance to cavitation, block structure, grade V tightly closed ranks, pump valve's office, start working and resting runtime pump start work after normal time closing valves, valve valve is generally for failure. ( The minimum flow of old power plants have used switch mode stem valves, as well as the use of mechanical pump semi-automatic circulating valve) 。 Start work when the valve working condition requirements: boiler pressure force can reach 100 - 300 kilograms, flow is small, when normal operation of the pressure difference is small, large flow, flow adjustable ratio of 75:1 - 100:1. 3, high/low heater drain valve feed water heater hydrophobic, condensed water heater hydrophobic stem requirements: restrict the position of the condensed water heater, early will drip, namely the high water mark emissions, normal water mark a hydrophobic. Working condition of things: start working phase flow is small, the pressure difference is bigger, the normal things in large flow, small pressure difference, working condition of roughly similar feed valve. All kinds of plant structure similar, we first to cycle power plant as an example to briefly describes the selection of valve stem, then each plant in different local understand simple brief explanation.
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