Including the design parameters valve series,

Lives industrial power systems, most of the load will produce reactive power, not only affects the operation of the equipment, while the pollution caused by the power grid, power quality seriously affected. Based on the introduction of a variety of  Stainless steel needle valve  on the way to rolling mills, electric arc furnace, electric railway and frequency induction furnace and other readily produce large amounts of  Valve manifolds , voltage flicker and three-phase unbalanced load of industrial object of study, high-pressure static reactive power compensation device with valve assembly of key technologies, including tandem valve design parameters, low pulse forming plate (VBE) and high pressure final stage trigger plate (TE) circuit design as well as between them design of optical fiber communication channels. Series of high voltage thyristor valve design for the transformer secondary voltage rating of 10kV power users. Low pulse forming circuit boards using high-performance three-phase thyristor phase-shift trigger pulse forming integrated circuit as the core, the phase voltage signal synchronous voltage signal is compared with the power factor controller has issued a six-way pulse trigger signal formed by to control the working status of high-voltage thyristor.

Weld line formation mechanism of injection molded parts

Weld line formation mechanism of injection molded parts in the injection molding process, when using multi- gate or the presence of the cavity holes, inserts, as well as changes in product thickness dimension is large, plastic melt in the mold will occur in two or more directions flow , when the two stocks melt encounter, weld lines will form in the products . Injection molding weld line is not a phenomenon unique in other plastic molding process , such as: reaction injection molding, blow molding , die-casting weld lines will encounter problems . Weld line affects not only the presence of the appearance quality of the products , and the mechanical properties of products (strength and rigidity ) on a large , especially for  Instrument valve manifolds  , such as: fiber reinforced materials, etc. Effect of multiphase polymer blends more is obvious. Meanwhile molding process conditions on the performance of the weld line is huge, under different conditions, the strength of the impact zone of the weld line can reach 10 % to 2 valve control  Valve manifolds  is currently casting , injection molding valve casting technology has attracted people's attention for valve gate control has been a lot of research reports. Pouring hot runner valve gate design and application of the control method , is in the original with a hot runner gate to control the opening , forming a closed valve means , the injection gate opening and closing according to the specific requirements determine their work.

The valve stem and socket connection using both only with a small surface, and the stem easy displacement

As the valve core material is soft PVC, low strength, deformation, coupled with the use of the stem and the valve plug socket connection, not only with the two facets, and the stem easy displacement. Thus, soft spool off easily deal with them more difficult. To this end, in the end face of the original spool of welding a piece of hard PVC  Stainless steel needle valve  plate, completely solve the problem of the spool off. The specific method is to remove the spool system with a hard thick  Valve manifolds  stiffeners do smm, its outer diameter smaller than the outer diameter of about spool 10mm, to facilitate welding; width slightly larger than the diameter of the stem to facilitate flexible stem rotation.

Inverter side using constant extinction angle control, constant DC voltage control method of combining

According to the Southwest Water outgoing transmission planning programs of research and related research conclusions combination of foreign, ± 800kV DC transmission is technically feasible, more  Valve manifolds  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 transformer tap slow  Instrument valve manifolds  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.

The economic benefits of the application of the floating ball valve

Analysis of the economic benefits of the application of the valve float valve, water saving issues raised poor and polluted water so that our lack of freshwater resources, water  Instrument valve manifolds  China's economic development has become a major factor. Water not only in the present, but also in the future as a basic national policy of our country. Float valve application is an important city building water saving measures. The traditional  Valve manifolds  pontoon float valve piston float valve and float valve piston double floats. They exist in water pressure and float buoyancy in the opposite direction, closed lax, leakage serious loss, difficult maintenance and short life and other shortcomings.

The use of upper and lower float switch float valve

Eliminator is used to isolate and exclude the measured liquid containing gases. In most cases , have different degrees of liquid to be measured contains various gases into the flow of these gases if so , will affect the measurement accuracy of the flow meter . Therefore, in flow measurement systems , especially in high-precision measurement system, the eliminator is often  Valve manifolds  auxiliary device. Cool down the structure from the shell, float valve and the intermediate tube , and several other major components , fluid metering housing to withstand the pressure of work , the formation of the space required to meet the air eliminator . I High pressure ball valve  to create favorable conditions for oil and gas separation , when the liquid flows into the air eliminator , first hit the intermediate cylinder below the swash plate , so that liquid stream , and then along the intermediate  Instrument manifolds the annular space between the casing up to the middle of the upper cylinder change the direction of flow , the liquid effluent from the intermediate tube eliminator . Float valve is a float , the float rod , stem, valve, valve seat and the positioning ring , whose main function is to use the vertical float switch float valve , when oil containing gas, the upper layer of the gas down level , so that the float to fall , to fall float float rod through the open valve , thus making the gas pipeline from the sewage discharge ; when discharged , driven by rising liquid level float float, float valve closed , oil closed at eliminator inside .

Seal water supply cooling water pump is mainly backwater

Concentrator water booster pump station seal water supply whole plant, with a total water volume 180 m3 / h, while the tank volume adjustment only sm,. Seal water supply cooling water pump is mainly backwater, its  Instrument valve manifolds  of water changes, and more difficult to regulate big water tank, in order to ensure the production of water, tap water fill pipe mill will be open to the maximum, so that there is al Valve manifolds  tank, so the total amount of water tank is much larger than the amount of water tank, inevitably resulting in a great waste. To solve the problem of water wastage, the mill had tried using conventional float valve, but must be 100 pipes with a diameter of 600mm, float, its buoyancy tank water with the ups and downs vary widely, quickly causing valve rod damage, the effect is not ideal.

Spool with high-performance specialty plastics polyether ether ketone resin (PEEK) Manufacturing

In recent years, has become a research hotspot. General distribution of hydrothermal vents on the seafloor volcanic activity active regions, hydrothermal fluids with high  Check valve , high pressure, corrosion, etc., to the study of hydrothermal sampler brings a huge challenge. Deep-sea hydrothermal sampling required to maintain a constant pressure sample and the sample is not contaminated. sampler sampling valve is one of the key components of the system, the use of reliable  Instrument valve manifolds , the maximum working pressure of 70 MPa. according to anti-corrosion, high temperature and sealing requirements , TC4 titanium alloy valve body, valve using high-performance specialty plastics polyether ether ketone resin (PEEK) manufactured, it has a very high stiffness and hardness, as well as unique high tensile strength and fatigue strength, also has excellent high  Valve manifolds , thermal stability and corrosion resistance, continuous use temperature of 260 ℃, short-term temperature up to 300 ℃. trial found spool pressure differential generated by the axial load, due to the structure size unreasonable excessive stress can cause plastic deformation or fracture occurs, it is difficult to maintain pressure on the samples collected.

Stainless steel and carbon steel has many similarities

Boom is , the lower rib arch bridge to connect a critical component of the deck , the deck dead load and live load boom passed through rib , vehicles, wind ( rain ) , the earthquake causes  Valve manifolds  by the alternating stress far below the boom in the case of static strength fatigue failure may occur . Tianjin urban area in the construction of a three-span continuous steel arch bridge span arrangement of 51m +55 m +51 m, a length of 157m. For aesthetics , the bridge uses a new type of threaded connection includes stainless steel boom , boom is not due to this new  High pressure ball valve  steel used in the actual project experience , so it needs to be a special anti-fatigue properties. For stainless steel component performance and design of the study has been widely carried out . Research shows that  Instrumentation ball valve  steel and carbon steel has many similarities, but there are many different , making the design needs to be treated differently, such as carbon steel and low alloy proportional limit of at least 70% of the yield strength , and the stainless steel yield strength proportional limit of about 36 % and 60%. United States, Europe and Australia issued a stainless steel structure design specifications . Threaded connections in the project has been widely used , since the thread will produce stress concentration , and therefore under cyclic loading , it is easy to fatigue in threaded connections .

Rope diamond core drilling technology

Wireline diamond core drilling technology in China for more than 30 years of application history, has formed a relatively complete drilling processes and procedures. But the rope coring drill to maintain the original structure and the strength of the basic level , drill low intensity, short service life , operational reliability is poor, deep hole drilling accident rate , drill pipe break accidents have occurred , can not meet the mineral exploration rope core drilling needs. In order to meet future mineral exploration and development, narrowing the gap with foreign countries , we have a diamond coring drill string and rope  Instrumentation ball valve  for the study of its structure, size, thread and other aspects of the geometric parameters of depth theoretical analysis, mechanical model for simulation optimization , and strive to make our rope coring drill pipe design and application to achieve a high level. Statics using finite  Valve manifolds  , by means of the current international general finite element analysis software ANSYS rope coring drill to establish three-dimensional static finite element  2 way manifolds  model . Qualitative simulation drill pipe and fittings threaded in the working state of stress and strain distribution of such displacement field . Through structural statics study and explore the life of the main factors restricting the drill pipe . To contact the nonlinear finite element theory, the connecting thread for drill pipe joints for detailed theoretical analysis .

Drill pipe joints on stress distribution analysis, is used to improve the performance of key drill

Drill pipe is used for power transmission, conveying the main tool for drilling, oilfield drill pipe failure accidents often to bring huge economic losses. Statistical analysis showed that 65% of the drill string failure drill pipe joints in the accident. Drill pipe joints in use will determine the stress distribution pipe  High pressure needle valve  and sealing performance. Therefore, the tool joint distribution of stress analysis is used to improve the performance of key drill. Tool joint drill by the elastic-plastic finite element model of the threaded joints  Instrument valve manifolds  with female buckle buckle male contact surface is a space helical surface and drill pipe joint force is more complex, in addition to passing the turntable torque, but also by tension (mainly caused by the weight drill pipe), the pressure (mainly caused by the drilling fluid) and so the load effect. Stress Analysis of drill pipe joints involving material  Valve manifolds , geometric nonlinearity and complexity of the contact friction conditions and other nonlinear problems, the establishment of a complete and accurate mathematical model, seeking analytical solution is very difficult.

Stress intensity factor and the crack shape changes in turn affect the crack propagation life

Since the position of welded structures there is a high weld toe nonlinear stress distribution, the weld toe surface near the crack tip stress field will inevitably be affected. Meanwhile, due to the nonlinear stress crack surface makes the existence of the peak stress at the end increases, the speed surface cracks extended along the longitudinal  Valve manifolds  of the crack, changing the shape of the crack propagation. Near the crack tip stress field variations and changes will affect the shape of the crack surface crack stress intensity factor of size. Stress  Instrument valve manifolds  and the crack shape changes in turn affect the crack propagation life. Therefore, the discussion of non-linear distribution of stress on the surface crack stress  High pressure needle valve , crack shape and crack propagation life of welded structures for an accurate calculation of fatigue life is important. In this paper, butt weld toe surface crack crack propagation behavior of a large number of finite element analysis. Analysis assumes that there is no residual stress, porosity, incomplete penetration, dislocation, undercut other welding defects, the study focused on non-linear distribution of stress at the weld toe surface crack extension.

Siphon tube into the arrangement of shafts, inclined tube, curves, style and layout of the bridge and so are several

Liuxihe flower canal construction of the age, and the construction of the building of poor conditions, building alternatives are more earthworks dug to fill most of, resulting in low quality of the project, project shortened life issues such as local thin the fill leakage; Huadu District Water Department in recent years has increased the drainage remediation efforts to ensure the recovery and improve the flow of river irrigation and drainage canal flower  Valve manifolds , taking into account the cross along the river channel more trunk stream river channel bottom elevation than flowers on both sides of irrigation canal bottom elevation lower branch factors remediation process cross drainage  Instrument valve manifold  across more form with a siphon tube. The overall arrangement of inverted siphon siphon tube is when the channel across the valley, rivers, roads and set up channels for the connection of pressure pipelines, such as the shape of an inverted siphon pipes buried under the circumstances and height size, siphon tube into the arrangement shaft, inclined tube, curve type, and bridge and other types of furnishings.