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 .

Study and optimize the technical parameters of the main valve has a very important significance

Since marine nuclear power plant a special structure of the loop, we must set the main valve in the loop to control the primary coolant flow direction. Because hedge check valve which has novel design principle, the characteristics of simple structure, so the circuit  High pressure ball valve  power plant a very broad application prospects. Hedge check valve of the performance indicators for the safety of nuclear reactors have a major impact, the study and optimize the technical parameters of the main valve has a very important significance. In previous studies, this paper, based on the prototype for hedge type check valve in the experiment  Instrument manifolds  flow will not shut off the problem of lax, the main check valve structure presents two improvements. The use of pre-processing software to establish the main valve geometry, meshing, CFD software to use these two structures were improved drag coefficient, flow characteristics and valve head the force of these three aspects of the analysis, and based on the numerical simulation results, completed a hedge check valve structure optimization, increasing the main valve in the closed valve when the hydraulic power to determine the conduct of hedge-type check valve stamping tube diameter increases and the use of these two activities in the seat structure improvements.

Valve controlled protection system with high reliability and long-running sexual

Axial fan to blast valve as research object, the check valve controlled protection system , aimed at the check valve itself does not affect the work of the case , in the blast when the normal flow of ventilation ducts , improve valve valves, reducing valve head loss , improve blast furnace steel production . Valve controlled  2 way manifold  parts protection system using electromagnets and three-phase AC motor as the driving force to enhance the valves, electric control part adopts PLC as the main control device to control the movement of the mechanical structure ;  Instrument manifold  ​​redundant monitoring module , to improve the system reliability ; prepared using the graphical programming software remote monitoring program to facilitate the operator to operate the control system and view historical data ; serial communication and the use of CAN bus technology to connect PLC  Instrument valve manifold , redundant monitoring module and a remote monitoring system. Valve controlled protection system with high reliability and long-running nature , and has expansion capability. The greatest feature of this system is the mechanical moving parts with our own security, which can be electrically controlled in the case of partial failure of the check valve can still ensure the work ; Meanwhile , PLC and redundant monitoring module via two communication systems simultaneously, improving reliability ; preparation RMON program good user interface , making the system easier for the operator to accept.

Butterfly cushion valve with automatic opening and self-closing feature

Butterfly cushion valve is general machinery products. Domestic production of butterfly cushion valve, the main structure of the same type and applies only in the sealing temperature differ. Butterfly cushion valve with automatic opening and self-closing  2 way manifolds  automatic valves, pressure loss also has shortcomings, is a traditional blast furnace  Instrument valve manifolds  supporting devices. In this paper, the technological transformation of check valves, check valves shall be  Trunnion ball valve  a control system, not only did not change the check valve automatically opens, auto-off function, but also it has the energy-saving features, while improving the prevention and control of non-return valve BF axial fan surge and counter functions....