To check whether the power unit supporting the installation is solid

Check before using the water pump pumping water irrigation, should do security checks prior to use. To check whether the bolts complete all parts of the device, loose, to ensure the safe operation of the pump. To check the power machine is safe and effective. Use Diesel, check the cooling water, lubricating oil, etc. are missing, functioning properly; using a motor, you should  Check valve  check the line set up, connecting  High pressure ball valve  safety requirements, grounding line is reliable, the motor is damp, the circuit is intact, preventing electric shock, ensure the safe use of electricity. To check whether the unit power matching is firmly installed. Note Check the power machine and water pump drive connection is standard, safe, reliable,  Instrumentation ball valve  joints are equipped with security features such as fenders, protective nets to avoid dangerous accidents. No water pump causes and troubleshooting irrigation water shortage: Before starting the pump, pump should be (including the inlet pipe) filled with water, or lack of irrigation water, air pump, you can not smoke in Sheung Shui. May take enough irrigation water, drain pump air solution.

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 .

The role of the use of a variety of valve working condition Isolated Conversion

Electric locomotive control air piping system is an  Valve manifold  part of the piping system for electric locomotive pneumatic appliances, such as the pantograph, the main circuit breaker and safety protection devices such as door interlock or key box, high-voltage electrical cabinet with compressed air. Is to ensure the normal operation of locomotive  Instrumentation ball valve  part. In order to prevent backflow of compressed air to ensure the pantograph, the main circuit breakers and high-voltage electrical cabinet two position switch, electrical contacts and other aerodynamic components of the normal work in the electric locomotive control piping system which is Instrument valve  check valve, the use of the role of non-return valve isolated Conversion various conditions. Check valve in the practical application process, the most common failure is channeling the wind, that the phenomenon of compressed air countercurrent direct impact locomotives l bow, closing and other operations.

On the check valve in the heating system to study the role of water hammer

In large-scale central heating system, water hammer event of an accident , destruction and strong , serious consequences , it must take active preventive measures to minimize and prevent water hammer phenomenon. Heating system piping valve is a very important component in the check valve is installed, structural parameters and closed  Male connector  system security and reliability has a great influence . If the check valve used properly , can play the role of water hammer protection ; However, if used improperly, not only can not play a protective effect on the heating  Instrumentation ball valve  piping in the heating system caused large fluctuations . So the check valve in the heating system to study the role of water hammer has a very important practical significance and academic significance. Transient fluid  Instrument needle valves  the perspective of the requirements for the non-return valve in the power interruption can only turn on or off , but should be based on the liquidity situation in the heating pipes on the speed of the hoist has certain requirements . Improper opening and closing speed will cause the system to a sudden increase in pressure in the pipeline or fall , when the pressure on the appreciation of the tube is large enough can cause rupture . To ensure system security, must be a reasonable choice and close the check valve structure curve , it has played the role of water hammer .

Commercial CFD software research and internal flow check valves

From the study of fluid flow valve mechanism departure, using numerical simulation valve internal flow, numerical simulation results to guide the design of the valve has  2 way manifolds  an important research direction. Numerical simulation tools, one can save test resources, shorten new product development time; hand it can display is difficult to draw from the test flow characteristics in detail. In this paper, commercial CFD software research and internal flow check valve, mainly to do the following tasks: outlines the current situation and the check valve design  Valve manifold  fluid  Instrumentation ball valve  the check valve in the common software applications. Details of the basic theory and computational fluid dynamics method, the calculation method for solving algebraic equations and a variety of mesh generation techniques. Finally, multi-channel Ball Check Valve internal three-dimensional incompressible turbulent flow was simulated, and the results are experimental verification.