requirements: work during low flow resistance to cavitation. 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. Condition of things: start working phase flow is small, large pressure differential temperature, normal things in large flow, small pressure difference, working condition of roughly similar feed valve. requirements: resistance to flash scour, V or VI level tightly closed, valve for failure. requirements: WCB/WC9, for double valve system start to work in the cavitation resistant valve requirements, to V closed ranks, 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. Working condition of things: high temperature and high pressure steam, valve requirements: thermal shock, noise reduction, response speed. But first to thinking problem is stem valve safety and reliable. 4, in addition to the oxygen water standard stem valve stem requirement: water supply flow to keep the normal except oxygen device standard, after growth in steam temperature eliminate gas dissolved in the water. 3, high-low heater drain valve ( Feed water heater hydrophobic, condensed water heater drain) Stem requirements: stem position of condensed water heater, early will be condensed water discharge, high water mark emissions, normal water mark a hydrophobic. Fault clearance for the general valve selection. 1, the feed valve ( Lord, attached to the boiler feed water Industrial Valves, compound feed water regulator) Stem: stem boiler into the water, to ensure steam evaporation, maintain boiler water standard ( Lord, enclosed type boiler feed water valve system contains two stem valves, start working when using a used in boiler, a used to use normal to the river. Q: plant stem valve selection and use of answer: in the thermal power industry, curb the valve working condition of the use of a special, simplified, power flow is the cycle of water, steam flow, but in this process was selected with stem valve is both simple and complex. 2, boiler feed water pump minimum flow circulation valve stem requirements: make the boiler feed water pump, the paper start working and resting operation, eliminate because flow is too small, temperature increase, water pump cavitation damage. The minimum flow of old power plants have used switch mode stem valves, as well as the use of mechanical pump valve semiautomatic cycle. 。 Working condition of affection Marine valve conditions: 160 - pressure drop 350 kilograms, is the largest power station system bear the pressure differential valve, flow was 30 to one hundred percent of normal flow. Working condition of things: valve pressure boiler the beginning of the work force can - 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. Working condition of things: water, differential pressure larger valve requirements: a variety of types: nozzle type, and help atomization type, self including type and type to the clamp. 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 of steam, a supply for steam turbine bypass channel, boiler steam turbine independently and office. 5, desuperheating valve ( Attemperator) Stem requirements: the high pressure water spewing into the steam to steam temperature curb demand. Highest limit water working condition of things: 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 normally after the valve closed, valve for failure. Notes to the order: The national standard) A, A: B: product name, model, nominal size medium and temperature, pressure range C: whether there is attachment, delivery time, and special requirements so that we can correct selection for you. Second, if the valve has been selected by design unit of our company model, please order according to the valves parameters directly with our sales center. Three, it is very important when you use the occasion or the environment is more complex, would you please provide design drawings and detailed parameters, our engineers experts will concentrate on review and analysis for you. We can provide you with professional solutions, including design, customization, complete, operation and service. We've been working on the Industrial Valves leader in the field of industry, to provide you with the latest knowledge of the Industrial Valves, the best service, best technical adviser. Thank you for visiting our website, if you have any questions, you can call us, we will be dedicated to provide you with quality services. The factory provides professional ball valve, butterfly valve, gate valve, globe valve, check valve, relief valve, safety valve, Marine valve, oil valve, hydraulic control valve and other kinds of valves.
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