Valve in fluid piping systems, valves to control the device, its main role is to isolate equipment and pipeline systems, regulate flow, prevent the return of the pressure regulation and excretion. Because the pipeline system to select the most suitable stop valve is very important, therefore, solution selection stop valve characteristics and the method and basis for the stop valve becomes crucial up.
Valve industry so far has been able to produce the full range of gate stop valve, globe stop valve, throttle stop valve, plug valve, ball valve, electric valve, diaphragm valve, check valve, safe valve, relief valve, steam trap and emergency shut-off valve in 12 categories, more than 3,000 models, more than 4000 specifications of valve products; maximum working pressure of 600MPa nominal maximum diameter up to 5350mm maximum working temperature of 1200 ℃, the minimum working temperature of -196 ℃, for medium for water, steam, oil, natural gas, strong corrosive media (such as concentrated nitric acid, sulfuric acid concentration, etc.) flammable medium (such as benzene, ethylene, etc.) toxic medium (such as hydrogen sulfide) explosive medium and radioactive medium (metal sodium loop pure water, etc.) pieces of material bearing bronze valve, cast iron, ductile iron, high silicon cast iron, cast steel, forged steel, high, low-alloy steel, stainless and acid resistant steel, Hastelloy, Inconel Seoul , Monel alloy, duplex stainless steel, titanium alloy. And can produce all kinds of electric, pneumatic, hydraulic valve actuator. The valve face of so many varieties and complexity of the various operating conditions, to select the most suitable for installation of piping system valves that, first of all should understand the stop valve of Texing; second method should have a choice of stop valves and Yi Ju; Furthermore, the stop valve should follow the principle of selection.
There are two general characteristics of the stop valve, use and structural properties.
Use features: the main stop valve to determine the performance and scope, is using the characteristics of the stop valve are: the type of stop valve (closed stop valves, regulating stop valves, safe stop valve, etc.) product type (gate valve, globe valve, butterfly valve, ball valve, etc.) the main valve parts (valve, valve cap, stem, disc, sealing surface) data; valve drive pattern.
Structural characteristics of stop valves: identification of the stop valve device, maintenance, and other methods used in the cozy structural characteristics, there are structural features: the structure of the stop valve length and overall height, form the connection with the pipe (flange connection, threaded connection, clamps to connect, external threaded connection, welded end connections, etc.) form the sealing surface (Ring of, thread ring, welding, spray welding, stop valve body) stem structure (rotation pole, lifting rod) and so on.
Select cut-off stop valve when the stop valve to clear the device or devices in use, to determine the working conditions of the valve: for medium, working pressure, temperature and so on. Connected with the valve to determine the nominal pipe diameter and connections: flanges, threaded, and welding. Way to determine the valve operation: manual, electric, electromagnetic, pneumatic or hydraulic, electrical or electro-hydraulic linkage, etc. linkage. According to a pipeline to transport the media, working pressure, working temperature to determine the valve housing and within the selected pieces of information: gray iron, malleable iron, ductile iron, carbon steel, alloy steel, stainless and acid resistant steel, copper alloy. Select the type of valve: closed valves, regulating valves, safe valve. Determine the type of valve: gate valve, globe valve, ball valve, butterfly valve, throttle, safe valve, relief valve, steam trap, and so on. Determine the parameters of the valve: the automatic valve, according to different need to determine the flow resistance to allow the discharge capacity, back pressure, etc., and then determine the nominal pipe diameter and the valve seat hole diameter. Valve used to determine the geometric parameters: the length structure, form and size of flange connection, a high degree of opening and closing direction after the valve size, connection size and number of bolt holes, the stop valve shape size. Use of existing information: stop valve product catalog, product samples, and choosing the right valve of valve products.
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