Ball has been used as a cutting device used in high temperature and high pressure piping conditions

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 forged steel body is very necessary. Structural design forged steel ball valve  Stainless steel needle valve  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 finished parts, material utilization. Consider the economy, as far as  High pressure ball valve  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.

Cone valve stilling basin using turbulent jet turbulent diffusion to deliver energy and mass

Cone valve stilling basin using turbulent jet turbulent diffusion to deliver energy and mass , and ultimately achieve the purpose of energy dissipation . Cone valve has a simple structure , no moving parts, easy maintenance , good sealing and low flow can be precisely controlled a stream and a series of unique characteristics, so frequently used in low flow high head water works to improve conventional brake  High pressure ball valve  control the flow of small, easy to cause vibration chamber is too small, inconvenient construction , aerated water gates and high-speed difficult to control and other shortcomings , but tapered cone valve so that water flows out to the edges along the stilling basin after the flow , water blending intense ,  Instrument valve manifolds  flow , the flow field flow pattern is very complex, especially around the cone valve , water has obvious strong three-dimensional features. ejected flow hydraulics studies has been a research problem, and cone valve , etc. due to the limited complexity of the flow boundary conditions , water flow and a strong three-dimensional nature of modern testing methods for its pilot study , theoretical analysis more difficult. domestic applications is very limited, the project is also due to the imperfect information and its application is less , so the study of both the cone valve engineering applications or further developed in future flow flow pattern and energy dissipation characteristics are of great significance.

The valve as a fluid conveying system control unit, are increasingly exposed valve antibacterial Manufacturing Technology

With the continuous fermentation technology applications extension and expansion of the wine fermented products made ​​from pure sugar industry extends to the medical and health industry, pharmaceutical antibiotics , hydrocortisone and prednisone drugs and other medicine . In modern brewing and pharmaceutical fermentation process , the valve for cutting or connectivity steam, water , culture medium, fluid such as air , the engineering system regulating and controlling fluid flow within the pipe or vessel pressure control pipe is indispensable . However, large quantities of medicines , automated industrial production , the valve control as a fluid delivery system components are also increasingly  High pressure ball valve  manufacturing technology and pharmaceutical production process requirements of the non-adaptive and gaps , develop new antibacterial valve is necessary . Technical requirements in accordance with the food and pharmaceutical industries relevant standards , antibacterial  Double ferrule fitting  only have good sealing performance , but also from the structural design of the valve to start, can effectively prevent harmful bacteria in the derivative and multiply within the valve to eliminate the production process occurs Bacterial contamination or inverted pot phenomenon . Valve leakage can not occur ( seepage ) leakage , resulting in the common run, run, drip, leak , otherwise it will contaminate the production environment , affecting civilized production . Valve material should have good resistance to corrosion and rust resistance, and the production of raw materials contact the media reaction does not occur and generate new substances.

The valve as a fluid conveying system control unit, are increasingly exposed valve antibacterial Manufacturing Technology

With the continuous fermentation technology applications extension and expansion of the wine fermented products made ​​from pure sugar industry extends to the medical and health industry, pharmaceutical antibiotics , hydrocortisone and prednisone drugs and other medicine . In modern brewing and pharmaceutical fermentation process , the valve for cutting or connectivity steam, water , culture medium, fluid such as air , the engineering system regulating and controlling fluid flow within the pipe or vessel pressure control pipe is indispensable . However, large quantities of medicines , automated industrial production , the valve control as a fluid delivery system components are also increasingly  High pressure ball valve  manufacturing technology and pharmaceutical production process requirements of the non-adaptive and gaps , develop new antibacterial valve is necessary . Technical requirements in accordance with the food and pharmaceutical industries relevant standards , antibacterial  Double ferrule fitting  only have good sealing performance , but also from the structural design of the valve to start, can effectively prevent harmful bacteria in the derivative and multiply within the valve to eliminate the production process occurs Bacterial contamination or inverted pot phenomenon . Valve leakage can not occur ( seepage ) leakage , resulting in the common run, run, drip, leak , otherwise it will contaminate the production environment , affecting civilized production . Valve material should have good resistance to corrosion and rust resistance, and the production of raw materials contact the media reaction does not occur and generate new substances.

Fuel supply system must be precisely controlled by the flow valve

Scramjet engine fuel flow regulator is proportional flow control valve to achieve. Since the flow control valve into the first fuel for cooling the engine , into the engine for combustion , and thus the fuel through the flow control valve temperature up 400 ~ 500 ° C. Fuel feed speed control for fuel combustion and engine performance  High pressure ball valve  are essential, so the fuel supply system must be precisely controlled by the flow valve . High temperature environment has the potential to bring the following temperature flow regulating valve problems: First , the flow control valve does not have a temperature resistance to high temperature ,   Needle valve  and corrosion-resistant properties ; secondly , because of the flow control valve at room temperature under high temperature and large thermal expansion coefficient a small yield stress and thermal Compression fitting , the spool movement of the valve sleeve affected, leading to failure of the flow control valve adjusted . Thus high thermodynamic characteristics of the flow control valve analysis is crucial, particularly the flow control valve moving friction with the surface size of the gap , if the working member between the amount of thermal deformation due to material and structure in the first and the larger , then it may movement can cause friction with the gap grows or shrinks , if the gap increases, the result is bound to make the seal gap increased fuel leakage ;

Using a special type of axial-flow check valve, in order to ensure the safe and efficient operation of equipment, piping systems

With the large domestic oil refining and ethylene and other petrochemical projects and the new expansion , long-distance oil and gas pipeline systems and large ethylene plant compressors and large pumps and other working conditions more demanding pipeline system that requires selection of quick closing , low pressure loss and noise valve. Especially the gas medium , for ordinary swing , dual plate check valves,  High pressure ball valve  is often not fully open , resulting in medium flow instability, pressure loss , prone to mechanical vibration , noise, large , etc., thus  Needle valve  a large compression the normal operation of the pump unit . Then you need to use a special type of axial flow check valve, in order to ensure the safe and efficient operation of equipment and pipeline systems . Axial quick closing check valve function . Axial flow check valve and swing , dual plate check valve , compared short trip, especially the relatively large  Check valve  stroke is shorter , you can achieve rapid closure . The fluid system the damaging effects of water hammer to a minimum. Axial flow check valve closed completely along with the reverse flow of fluid , short stroke valve ensures fast dynamic response, and reverse flow through the valve to a minimum , thereby preventing the risk of water hammer phenomenon occurs . Turn to protect equipment from damage caused by fluid backflow . Can completely prevent the media back cause upstream device damage.

Reasonable spool streamlined design is to reduce the axial flow valve performance, and these flow regimes effective way to improve the flow capacity

Axial flow check valve for its smooth operation, water hammer pressure is small , easy to cavitation , the medium pressure changes fast response, low noise and good sealing , etc., are widely used in oil and gas gathering pipeline network and other pump outlet Fire and petrochemical pipes for the non-return devices. Axial flow valve spool to its linear structure is reasonable flow resistance coefficient , pressure loss, boundary layer separation flow pattern greatly affect its performance , sleek design and reasonable spool axial flow check valve is to reduce these flow  High pressure ball valve  and improved flow capacity and effective way. The design method of the previous valve passages are usually small change in slope of the straight line and the curve of a linear combination , the valve flow patterns  Trunnion ball valve  its performance . The paper -based sources and sinks France and precise method of mathematical expressions , presents a check valve spool axial  2 way manifold  design. Linear design methods valve design uses source-sink method . Source-sink method is the zero flow line style design, the design of this method over the fluid flow channel has a smaller flow resistance , and the boundary layer easily separated , the valve meet the movement of fluids , but not all of the sources and sinks France are suitable for linear valve design .

In a very short time, the sharp rise in pressure in the pipe, can achieve large value

Water hammer is a pressure pipeline systems a common physical phenomena. When the audio channel in the continuity of the liquid caused by the pressure drop transient  Instrument valve manifolds , again followed by pressure recovery, the collapse of the cavitation effect is as if a hard metal hammer hammering the same effect as in a very short period of time , sharp rise in pressure in the pipe, can achieve large value, or even alternately lifting the pressure fluctuation. For example, in the flow direction has a long pipe, leading abruptly closed, the pipeline and water will  High pressure ball valve  forward due to inertia, while the formation of cavitation, then the water has been pushed back and rupture of cavitation. Sometimes accompanied by hammering appear roaring sound and vibration. This is the. Flow velocity in the pipe caused dramatic changes in the internal pressure of the fluid alternately lifting of wave phenomena, namely the so-called hydrodynamic water hammer phenomenon, also known as water hammer phenomenon. Initially, this phenomenon did not cause nuclear power plant designers and researchers' attention.

Valve pipe before there media, such as improper operation will cause pump impeller Rewind

Reducing structural characteristics of the design check valve check valve is to rely on the media selected energy afloat turned off automatically when backflow valve. Petrochemical  Valve manifolds  the installation of the pump outlet check valve, the past is the main and standby pumps were equipped with a check valve, are installed in horizontal pipelines, far away from the pump, check there before the pipeline medium, such as improper operation, will cause pump impeller reversed. According to  High pressure ball valve  & Chemical Corporation, the industry standard requirements, each pump check valve must be installed, and require as close to the pump, mounted on the front of the pump outlet valve. Click here to claim  Compression fitting , structure, length is too long, resulting in the pump outlet valve height is too high, causing inconvenience to the operation and maintenance; simultaneously swing check valve is easy to produce water hammer pressure drop Japanese have not any position installation disadvantages. To reduce the height of the outlet valve in the structure, so preventing water hammer, lower pressure drop, with the domestic pump characteristics and process requirements, the development of a new type of valve, the valve diameter.

Swing check valve and nozzle check valve, two identical pump conditions

Select the correct meaning and principles of the check valve in the hydraulic system pump , check valve plays a very important role, but it also brings a lot of trouble . Central power plants such as the UK , 16% of accidents are caused by a non-return valve which stops unexpectedly leaving the pump check valve closed water hammer accident rate is highest. Such water hammer strength not only by the impact of the entire hydraulic system , but also by the characteristics of the check valve itself . Two  High pressure ball valve  parallel springs station system that they were installed at the pump outlet DN 600 swing check valve and nozzle check valves , two pumps  Valve manifolds  are identical, while three parallel pumps have a when the pump stops unexpectedly , two kinds were measured downstream of the check valve of the water hammer pressure variation parameter , as shown in Figure 2 . Figure 2 curves show the characteristics of the water valve itself has a great  Check valve  of impact, therefore, of a particular line , the correct choice of the pump station valve is particularly important. The selection of the ideal valve should follow the following principles : ( 1 ) check valve must have the ability to resist corrosion pumped medium ; ( 2 ) check valve nominal pressure with the working system to match ; ( 3 ) check valve fully open resistance losses must meet the technical design requirements, normal working hours, should be able to ensure full ;