Production of high temperature and Instrument valve pressure valve metal seal valve for use in supercritical thermal power units

Since the development of materials and manufacturing technology, pipeline ball valves have been used as a cutting device used in high temperature and pressure conditions. Production of high temperature and pressure valve metal seal valve in supercritical thermal power units are used, replacing the original cut-off valve and the valve, its bubble-tight performance and longer life than traditional globe valves and gate valves. High parameters and high-performance steel ball valve body has not meet the requirements, so a better toughness, higher reliability of  Stainless steel needle valve  body is very necessary. Structural design forged steel ball valve forged steel valve body design first thing to consider forging process, namely the forging process less than a block, a small margin, shape and size close to  Instrumentation ball valve , material utilization. Consider the economy, as far as possible in the general process of forging equipment, forging equipment because of the large and special use fee is high, while the cost of mold manufacture and use is also more expensive. Forged steel ball valve has two and three-piece. Two-piece body structure more suitable for forging, the body needs to squeeze in a closed die forging, large deformation force requirements, require large forging equipment.

Standardized prefabricated manifold forms, changed some of the limitations of the past in the field of direct production and installation

Philatelic oil, set to close the ball valve petrol station inside and oil and gas gathering pipelines, are used in the form of standardized prefabricated valve, changed in the past in the field of direct production and installation of some limitations. Project site assembly is relatively reduced, adverse effects of climate and other factors is small, while the dismantling of prefabricated valve interchangeability with regularity and speed up the construction progress. Reasonable to avoid the aerial assembly. Narrowing the range of operations, reducing the security  Stainless steel needle valve . Prefabricated valve materials are mostly carbon steel, stainless steel; in the number of low-pressure pipelines primarily to a relatively small proportion of high-pressure pipelines; presence of a large number of saddle mouth open system workload; butt weld seam in the form of the main;  Instrument valve manifolds  for welding high. To ensure the quality and performance of our valve products and processes using reasonable prefabricated welding backing, automatic welding cap surface welding process. And distortion factors to be produced during welding and lifting analysis to take effective control measures.

Prefabricated metering valve between the process, according to the condition of the structure, characteristics and possible causes deformation produced

During the welding process , the structure is subjected to uneven heating and cooling , the metal parts of different degrees of expansion and contraction . Metallic material as a whole, interrelated, mutual restraint, elongation and shortening are not free , so the welding process will produce stress and deformation . Welding deformation leads to the size and shape of the weldment changes directly affect the manufacturing quality . If the distortion exceeds the normal range , you need to rework correction processing , reduce work efficiency, but also increase the cost of production. Between the metering valve prefabricated process, depending on the situation should be carefully analyzed its structure ,  Stainless steel needle valve  and possible causes deformation , select a reasonable measures to control the deformation process , meet the technical standards in order to improve the effectiveness and reduce unnecessary losses . When the valve between the measured deformation reason prefabricated , conducted at the Department of  Instrument valve manifolds  tube cutting and welding are localized uneven heating process . Cutting and welding , thermal expansion of the high temperature region , hindered by the rigidity of the surrounding area and can not freely low elongation , resulting thermoplastic deformation. Upon cooling, the high-temperature region due to shrinkage of the thermoplastic deformation of the large amount of shrinkage in a low temperature region is small, this causes uneven shrinkage generated manifolds condensed bending.

Plastic intake manifold light weight, low material and manufacturing costs, smooth wall, the air flow resistance can be reduced

Plastic intake manifold light weight , low material and manufacturing costs , smooth wall , the air flow resistance can be reduced to improve engine performance , economy and emissions improvement . Currently , gasoline plastic intake manifold design technology has matured , the country already independent research and mass production, while diesel plastic intake manifold design is still in its infancy. Plastic instead of metal as a car engine intake manifold material , the intake manifold is the trend of the development lies. However, in the design and  Instrument manifolds  of the intake manifold , the assembly of the research is the development process is often overlooked issue. This article will be mounted design ideas throughout the plastic intake manifold design is always , can be assembled primarily through the design and evaluation , research and analysis of the plastic intake manifold can be assembled . First, the structure and  Stainless steel needle valve  the engine and the intake manifold is analyzed . Followed by the assembly from the engine , and the engine intake manifold assembly , the assembly and maintenance of four intake manifold intake manifold accessories detailed analysis of the engine intake manifold assembly process and assembly difficulty. Explore again from the subsidiary parts, assembly sequence , ergonomics and summarizes the evaluation of three engine intake manifold assembly of quality standards and principles , focusing on human-computer engineering from the engine intake manifold assembly were studied .

Compound turbo system can achieve a good match with the diesel engine in the whole range of operating conditions, improving diesel power

Energy shortage and environmental pollution are two major challenges that face the world today, the development of efficient, clean diesel engine is a key issue in the study. Conventional exhaust gas turbocharger is difficult taking into account the high-speed, low-speed diesel engine operating conditions, the simultaneous existence of part-load economy and acceleration performance and poor. Compound turbo system can be implemented in the whole operating range of diesel engines with a good match, improving the engine power, economy and emissions, has drawn  Stainless steel needle valve  at home and abroad. Firstly, the use of software to establish a composite turbocharged diesel engine simulation model and numerical simulation. The simulation results show that the composite turbocharged engine to improve low-speed, high-speed power and economy. Meanwhile, the composite obtained by numerical simulation turbo intake system and exhaust bypass valve bypass valve control strategy provides a reference for the trial.  2 way manifolds  optional turbocharged, engine bench tests conducted research complex turbocharged. Were matched based on the high-pressure stage turbocharger optimal fuel economy principles. Composite turbocharged program conducted to determine control strategies of different speed and load, the effect of the exhaust bypass valve and the intake bypass valve opening on engine performance, determine the total working conditions and wastegate intake bypass valve opening degree control.

Compound turbo system can achieve a good match with the diesel engine in the whole range of operating conditions, improving diesel power

Energy shortage and environmental pollution are two major challenges that face the world today, the development of efficient, clean diesel engine is a key issue in the study. Conventional exhaust gas turbocharger is difficult taking into account the high-speed, low-speed diesel engine operating conditions, the simultaneous existence of part-load economy and acceleration performance and poor. Compound turbo system can be implemented in the whole operating range of diesel engines with a good match, improving the engine power, economy and emissions, has drawn  Stainless steel needle valve  at home and abroad. Firstly, the use of software to establish a composite turbocharged diesel engine simulation model and numerical simulation. The simulation results show that the composite turbocharged engine to improve low-speed, high-speed power and economy. Meanwhile, the composite obtained by numerical simulation turbo intake system and exhaust bypass valve bypass valve control strategy provides a reference for the trial.  2 way manifolds  optional turbocharged, engine bench tests conducted research complex turbocharged. Were matched based on the high-pressure stage turbocharger optimal fuel economy principles. Composite turbocharged program conducted to determine control strategies of different speed and load, the effect of the exhaust bypass valve and the intake bypass valve opening on engine performance, determine the total working conditions and wastegate intake bypass valve opening degree control.

Compound turbo system can achieve a good match with the diesel engine in the whole range of operating conditions, improving diesel power

Energy shortage and environmental pollution are two major challenges that face the world today, the development of efficient, clean diesel engine is a key issue in the study. Conventional exhaust gas turbocharger is difficult taking into account the high-speed, low-speed diesel engine operating conditions, the simultaneous existence of part-load economy and acceleration performance and poor. Compound turbo system can be implemented in the whole operating range of diesel engines with a good match, improving the engine power, economy and emissions, has drawn  Stainless steel needle valve  at home and abroad. Firstly, the use of software to establish a composite turbocharged diesel engine simulation model and numerical simulation. The simulation results show that the composite turbocharged engine to improve low-speed, high-speed power and economy. Meanwhile, the composite obtained by numerical simulation turbo intake system and exhaust bypass valve bypass valve control strategy provides a reference for the trial.  2 way manifolds  optional turbocharged, engine bench tests conducted research complex turbocharged. Were matched based on the high-pressure stage turbocharger optimal fuel economy principles. Composite turbocharged program conducted to determine control strategies of different speed and load, the effect of the exhaust bypass valve and the intake bypass valve opening on engine performance, determine the total working conditions and wastegate intake bypass valve opening degree control.

Heat load and close when burning diesel, turbocharger boost pressure control and economy-related

When the natural gas used in gasoline engines may be appropriate to increase the compression ratio, ignition timing and engine supercharger strengthened. In order to reduce emissions and improve fuel gas economy, the lean gas engine by way of control of NOx emissions, the use of  Stainless steel needle valve  produce higher power output, the thermal load near the diesel fuel and turbocharger boost pressure control and related economic . Often work in small engine load, the load is determined by adjusting the degree of  Instrument valve manifolds  of the throttle body, throttle body is generally mounted on the intake manifold, throttle pressure before the small load will be much higher than the intake manifold pressure, inlet pressure booster form does not form useful work on the engine, and therefore, the need to boost pressure under small load control to reduce fuel consumption.

After the explosion in a confined space aluminum aerosol particle size spectrum and its produce changes over time

Plutonium oxidation at different temperatures size particles varies with temperature . Generally produce plutonium wire explosion PM2.5 ( particle size less than 2.5μm) particles , the particle size for the safety assessment and environmental protection is important. Existing chemical nanoscale aluminum powder explosives and explosion in a confined space generated aerosol particle size spectrum and its changes over time for  2 way manifold  reports . Studies conducted in our laboratory showed that , despite the size spectrum with specific  Valve manifolds  vary, but nanoscale particle number concentrations are high. Agglomeration and sedimentation of collision and other reasons , the particle number concentration change with time approximately exponential decay law , " half-life " in the range of 30 ~ 90min . To avoid inhaling plutonium irradiation damage caused by  Stainless steel needle valve  plutonium experiments exhaust general subject of nuclear grade HEPA filter processing, in which plutonium concentrations below the national standard limit to emissions. Of radiation protection regulations , 239PuO2 derived air concentration 0.2Bq/m3. Currently, the widespread use of plutonium aerosol α continuous monitor for continuous online monitoring of plutonium aerosol , the principle is: membrane aerosol particles collected online , the emission of α particles with α detectors measure , according to the judgment particle energy spectrum nuclide composition and content .

Conventional HVDC system normal control mode

With the increasing power transmission and conveying distance scale gradually lengthened, the existing level ± 500kV DC transmission will not be able to meet the requirements, the objective need to adopt a higher level of DC transmission voltage levels. According to the Southwest Water outgoing transmission planning programs of research and related research conclusions combination of foreign, ± 800kV DC  Stainless steel needle valve feasible, more suitable for China's actual situation. In the conventional HVDC system's normal control mode, the rectifier side of the DC power required to calculate the dc current command, according to the current measurement value and the current value of the deviation obtained by proportional integral part of the firing angle to control the DC current while the commutation  Valve manifolds  tap slow  Trunnion ball valve  the firing angle as the reference value in the range of ± 2.5 °. Inverter side using constant extinction angle control, constant DC voltage control method combining with rectifier side HVDC control system together constitute the basic closed-loop control. ± 800kV DC transmission uses two 12-pulse inverter in series wiring, this wiring to make it run way more diverse.

Full metal pole loops; complete monopolar ground return line running

With the growth of the national economy , energy and the distribution of the load center features make the ultra- long-range , large -capacity power transmission become inevitable , the use of ± 800kV HVDC transmission technology, not only conducive to  Valve manifolds  transmission of scale , saving a lot of resources, transmission corridor You can also increase the level of security and stability of the grid . HVDC (UHVDC) project generally use two 12-pulse valve means connected in series to form a pole, this structure makes the entire DC system has great flexibility , based HVDC (UHVDC) of a pole 2 the characteristics of a valve in series , the DC system operation modes: full bipolar operation ; complete monopole metal loops ;  Stainless steel needle valve  ground return line run ; 3/ 4 bipolar ( a very full 1/ 2 is extremely uneven ) run ; 1/ 2 bipolar operation ; 1/ 2 pole metal loop run ; 1/ 2 monopolar ground loop operation. For the above characteristics, HVDC project must meet the following requirements: ① tandem two manifolds can be run  Stainless steel needle valve  ; ② stable operation of the two valves in series should be essential to maintain symmetry operation ; ③ When either a valve operation, through relevant the control inputs of two manifolds, AC / DC system should not produce too much disturbance ;

Hydraulic systems in nuclear power plants has been widely used in a variety of non-return valve

Nuclear energy is energy efficient in the world energy mix has occupied the position can not be ignored , so the safety of nuclear power plants has also been referred to the new height . Nuclear power plants are large and complex hydraulic system hydraulic control system , the system is strictly prohibited countercurrent many locations phenomenon , or it may lead to serious accidents, therefore , require a lot of system -return element . Fluid control valve is an important safety  Stainless steel needle valve  , it is through closing fluid countercurrent to ensure directional flow of fluid , which protects other fluid machinery and pipeline safety . Therefore, in the nuclear power plant hydraulic system has been widely used in a variety of non-return valve , such as swing check valves . Swing check valve has a disc-type plug hinged on the edge , through the back off.  Trunnion ball valve design , low price, good economy , high reliability, easy maintenance and daily wide range of sizes , etc., the valve in the nuclear energy systems are widely used , the impact of the piston slam shut valve overpressure has been generated as experimental measurements and models to study the subject . Thus, the conventional movement of the check valve member (i.e., the valve head or valve ) to do the speed often rapidly opening and closing movement , the valve itself which is necessary features .

Fluid control valve is an important safety element engineering

Nuclear energy is energy efficient in the world energy mix has occupied the position can not be ignored , so the safety of nuclear power plants has also been referred to the new height . Nuclear power plants are large and complex hydraulic system hydraulic control system , the system is strictly prohibited countercurrent many  Stainless steel needle valve  , or it may lead to serious accidents, therefore , require a lot of system -return element . Fluid control valve is an important safety component engineering , it is through closing fluid countercurrent to ensure directional flow of fluid , which protects other fluid machinery and pipeline safety . Therefore, in the nuclear power plant hydraulic system has been widely  Instrument needle valves  of non-return valve , such as swing check valves . Swing check valve has a disc-type plug hinged on the edge , through the back off. Because of its simple design , low price, good economy , high reliability, easy maintenance and daily wide range of sizes , etc., the valve in the nuclear Valve manifold  are widely used , the impact of the piston slam shut valve overpressure has been generated as experimental measurements and models to study the subject . Thus, the conventional movement of the check valve member (i.e., the valve head or valve ) to do the speed often rapidly opening and closing movement , the valve itself which is necessary features .