conveyor belt plaza

China chemical products consumer market potential, is to attract international chemical giants accelerating" beach". Bayer is one of them. Bayer MaterialScience Asia Pacific high performance resin polycarbonate unit director Rainer, Leitrim reveals, Bayer will increase investment, to set up in Shanghai chemical industrial zone of the base integration polycarbonate production capacity, by original plan100000tons to 200000 tons. The polycarbonate project plan 20
08 years of put into production.
Thunder mention the Bayer Material Science Group is the world’s largest polymers company,2006sales of over 10000000000euros. Polycarbonate is Bayer Material Science under the important department.
Ray says, Bayer in Shanghai will also invest in the construction of the integration of the base, an annual output of 7500 tons of polycarbonate production line project, used to enhance polycarbonate application product impact resistance and fracture resistant performance.
In addition, Bayer also added nearly 80000000Euro investment, through the establishment of new hot market specific regional markets, strengthen Bayer polycarbonate industry’s global network. And China is one of the main target markets investment.
In fact, Bayer was accelerated in China business expansion of international chemical industry one of the members of the" Legion". As the world’s largest chemical products consume one of countries, China for their attractive self-evident.
In mid May,131 German chemical enterprises held in Beijing sixth a HEMA Asia Exhibition Tour debut, with its innovative technology and product obtained from the Chinese order.
Recently held in Guangzhou China International is rubber-plastic exhibit, headquartered in the German chemical giant LANXESS, years in Wuxi engineering plastics plant to expand production capacity doubled, at the same time in this city to build Asia’s largest leather chemicals research and development center. In addition, Qingdao Rubber Research Centre has also started planning.
According to estimates, in 2010 before the Chinese market demand for chemical products will maintain an annual growth rate of 7%, far higher than the2.5% growth in europe.
Germany chemical engineering and Biotechnology Association Europe Dr Burnham said, the global chemical industry of Chinese chemical industry attention than for any other country.

ball valves, industrial ball valve, top entry ball valve

Recently, the Yangtze River hydraulic independent research and development of the” WJF mini excavator with multi-way valve” in the tenth session of the International Fair appearance, caused the wide attention to visitors. Full hydraulic excavator hydraulic multi-way valve is the Yangtse River is 4 ~ 6T compact full hydraulic crawler excavator research and development of new products, the product is suitable for small excavator working under bad environment, high pressure, high precision, high reliability products. Its main features are: type structure, has the advantages of compact structure, small volume, light weight, complete function. The reasonable matching of the throttle orifice area and the latching valve core area difference, the ingenious design of the movable arm to keep the valve, slide valve use special programs for throttle, so that each perform a stepless variable speed, good proportion characteristic. This product is now in the domestic well-known host small supporting bulk import substitution.

Gate Valves, ball valves, industrial ball valve

Alarm valve is an automatic sprinkler system to connect or cut off the water, and start the alarm device. In the automatic sprinkler system, the alarm valve is a vital component, its action has three: connect or cut off the water, outputs an alarm signal and prevent the water into the water supply, and the alarm valve through the system can supply device and an alarm device for inspection. Alarm valve according to different system consists of wet alarm valve, dry alarm valve and the deluge valve. 1wet alarm valve used for wet sprinkler system. Its main function is: when the nozzle is open, wet valve can be automatically opened, and the water flows into the water motor alarm sends alarm signal.
2dry alarm valve used for the dry sprinkler system. The valve flap valve is divided into two parts, the outlet side and system piping and nozzle connected, filled with compressed air, inlet side connected with water. Dry valve with air pressure and water pressure acting on both sides of the torque control valve differential valve opened and closed, can generally be divided into differential dry pipe valve and closed dry alarm valve two.
The 3deluge valve for sprinkler system, preaction sprinkler system, water system and water spray extinguishing system. The valve on the inlet side and outlet side connected to water, and pipeline system and nozzle connected, generally for ATC, only in the pre process system in air. Deluge valve opened by various fire detection device control.

ball valve manufacturer, stainless steel ball valves

Beijing on December 8th news, China valve ( CVVT,9.72, – 2.02% ) Holdings Limited announced today, thermal power plant supercritical valve production has been approved, and successfully developed the cryogenic valves. The company in the high-end metal valve manufacturing top, with Henan Kaifeng high pressure valve Co., Ltd. and Henan Zhengzhou valve limited company subsidiaries.
In addition, China valve Holdings Limited appointed Wang Zhiming as the R & D department, Wang Zhiming from 1965 onwards in the valve of the research work, has served as the chief engineer of large-scale valve manufacturing enterprise, has been developed to have1500meters to 2000meters deep used high-pressure ball valve, as well as the special military valve. The successful development of these products will fill gaps in the domestic market.
China’s valve Holdings Limited chief executive officer Wang Jianbao said," we all subsidiaries has a unique competitiveness, subdivides the market leader. With the firepower power plant supercritical valve production is approved, and the successful development of a cryogenic valve, fully demonstrated the company’s production, management team plans in the future to accelerate the other advanced product development."

Ball Valves, floating ball valve, metal sealed ball valve

2010-2012domestic valve test bench industry investment trend
Valve in the metering equipment plays an important proportion, valve test bench is the most extensive scope of application, the largest number of metering equipment varieties. There are more than 60% of the products have to go through weighing measurement. Valve test bench are widely used in industry, agriculture, commerce, foreign trade, transportation, medical care and construction of national defense scientific research and other fields. In China, valve test bench was listed as national key management legal measuring instruments.
China measurement industry has a long history of traditional industries and key industries. After the reform and opening up, China valve test bench industry had rapidder development, valve test bench of industrial management system, industry structure, product structure, technology level and located in national economy status is changed. Over the years, China is with mechanical valve test bench, nineteen eighties began to expand to the electronic valve test bench used and on large self development, China is now able to independently design and manufacture of high precision, fast speed, accurate measurement of the various electronic valve test bench.
2007 1-11 month, China electronic scale manufacturing industry realized a total industrial output value of 5604832000yuan, compared to the same period last year increased by 27.64%; and achieved a total sales income of 5385955000 yuan, representing year-on-year growth of22.39%; realize a total profit of 312114000 yuan, representing year-on-year growth of20.44%.
2008 1-11 month, China valve test rig manufacturing industry realized a total industrial output value of 8139544000yuan, compared to the same period last year increased by 42.92%; and achieved a total sales income of 7982791000 yuan, representing year-on-year growth of46.01%; realize a total profit of 469535000 yuan, representing year-on-year growth of38.69%.
Due to the rapid development of science and technology and improve the application of measurement products, digital, integrated, networked, intelligent will become the world’s valve test bench industrial development direction and key. Application of high technology content of Chinese advanced valve test bench, still depends on import supply stage, therefore, in the high technical content of the valve test bench products, China ‘s valve test rig manufacturing enterprises have a great development space. In addition, with the domestic consumption level and the continued growth of the industrial economy, valve test bench of products of domestic demand will be further pulled.

Ball Valves, gate valves, globe valves, butterfly valves

"2010 -2012China valve test bench industry investment analysis and forecast report" a total of six chapters. First introduced the valve test bench definition, classification, structure and industry characteristics, and then analyzes the current situation of industry of domestic valve test bench, and the Chinese valve test rig manufacturing industry industrial statistic data to undertake detailed analysis, and then introduced the development of electronic valve test bench. Subsequently, report on the valve test bench industry doing import and export analysis, finally analyzes the domestic valve test bench of industrial20 key enterprises operating conditions. If you want to on the valve test bench industry have a system of understanding or want to invest in valve test bench, this report is an indispensable tool for.

1 preparation before the start

open to ensure the safe operation of centrifugal pump plant, should be done before starting the necessary checks. First hand the slow turn coupling or pulley, water pump rotation is correct in observing, rotation is flexible, stable, and whether the debris in the pump, the bearing is functioning properly, the belt tension is appropriate; check that all screws are strong; check whether the unit around impede the operation of the debris; Check suction pipe submergence depth is adequate; have to turn off the water valve to reduce the starting load, and timely attention starts to open the valve.

2 running check

boot, you should check all instruments are working properly, stable, and should not exceed the current rating. Pressure gauge should be in the design range; check out the open centrifugal water pump plant is normal, check all parts of the unit for leaks; check compaction of fill, usually a small amount of filler at the appropriate leakage (less than 10 per minute ~ 20 drops), the mechanical seal leakage should not be greater than 10mL / h (about 3 drops per minute); rolling temperature should not exceed 75 ℃; bearing temperature should not exceed 70 ℃ and watch for abnormal noise, abnormal vibration, note that the reduction of water; to adjust the depth of the inlet port submerged; always clean up floating debris on the trash racks; through the belt drive, but also the belt is slipping

all-round light, port light, starboard light

3 down and stop after the note

stop off the water valve and then preceded down, to prevent backflow of water, damage to parts; each stop, they should promptly wipe the oil pump and piping to keep the unit clean appearance, to discover hidden; after the winter shutdown, the water should be immediately put the net, to prevent cracking the pump and internal parts; in use after the end of the season, to carry out necessary maintenance

4 centrifugal periodic inspection

ISGD, IRGD low-speed vertical pipe of the pump cycle checkpoint can be divided into the following three types: routine inspections, the use of checks, as described above; monthly check, without removing the case of parts, equipment exterior cleaning and minor repairs, including the temperature of the bearing, shaft seal and cause leakage of electrical insulation and other aspects of the inspection; regular maintenance, including replacement of seal oil, check the pump and motor shaft for wear in the checks, check coupling rubber ring damage control, cleaning mechanical seal, coolant filter and pump filter, check the wear of sliding parts, check parts contact with liquid damage, corrosion, etc.

hydraulic efficiency of the system depends on the volumetric efficiency of hydraulic pumps, when the volumetric efficiency dropped to 72%, you need routine maintenance, replacement of bearings and seals of aging, to replace or repair the gap exceeds the friction with the deputy, its performance is restored.

1, the hydraulic pump: direct axis is divided into pressure piston pump swash plate type oil from oil-type two. Most oil-based hydraulic pressure using a pressure tank, but also the oil pump itself up with the wheel cylinder to the pump inlet pressure provides oil. Since the oil-type oil pump’s self-competence, without external supply. Pressure hydraulic oil tank, after each time you start the machine, must wait to use hydraulic pressure tank after the stains, to operate machinery. Such as lack of hydraulic pressure when the tank as the machine, the pump will cause whip pull off and slip phenomenon, the board will cause the pump body and the platen of the non-return to normal wear and tear. The piston pump oil used up, the use of 3000h, the operator checks the daily needs of the piston pump 1-2 times to check the sound is normal pump operation. Found to slow down or bored cylinder car, you should check for the disintegration of the charge pump, check whether there is scratch the impeller edge phenomenon, internal gear pump gap is too large.

2, for the self-suction type piston pump, the hydraulic oil tank shall not be less than the oil within the standard limit, to maintain a sufficient number of hydraulic oil. The higher the hydraulic oil cleanliness, longer pump life.

3, piston pump bearings is the most important parts of the bearing, the bearing clearance there is no guarantee that within three pairs of hydraulic friction pairs normal space, but also undermine the friction pair of hydrostatic bearing film thickness, reducing piston pump bearing life. According to information provided by pump manufacturer, the average bearing life of 10000h, this value needs to be replaced over the new port. Dismantled bearings, no professional testing equipment can not detect the bearing clearance, but to use visual, such as surface scratches found roller or discoloration, it must be replaced. When replacing the bearings, the bearings should be noted that the original letters and type, piston pumps were powered by large load bearing capacity of the bearing, it is best to buy the original manufacturer, the original specifications of the product, if the replacement of another brand, you should consult an experienced bearing look-up table for the exchange of personnel, the purpose is to maintain the accuracy of grade and load bearing capacity.

navigation light, all-round light, anchor lights

4, three pairs of friction deputy inspection and repair: pistons and piston cylinder hole according to the standard replacement parts, when parts of a variety of ultra-poor gap, the method of repair according to the following:

(1) cylinder sleeve insert mounted copper, copper can be used to replace the sets of methods to repair. First, a group of plunger rod diameter trimmed to uniform size, then more than 1000 # sandpaper polishing diameter. Copper cylinder sleeve installed three methods: (a) or copper cylinder sleeve installed plus hot extrusion temperature refrigeration, assembly interference; (b) adopt a Loctite glue the assembly, which we approach requires copper jacket diameter surface grooves; (c) cylinder hole tapping, thread processing copper sleeve outer diameter, coated with Loctite glue, screw assembly.

(2) melting and burning copper binding mode of the cylinder sleeve, repair as follows: (a) the use of ground rods, repair manual or mechanical grinding cylinder bore; (b) the use of coordinate boring machine, re-boring the cylinder hole ; (c) the use of reamers repair cylinder bore.

(3) the use of “surface engineering”, as follows: (a) plating technique: a layer of hard chrome plated piston; (b) brush plating techniques: the surface plating wear on plunger materials; (c) thermal spray or electric arc spraying or spray: spray high-carbon martensitic wear-resistant materials; (d) laser cladding: the plunger surface, high hardness wear-resistant cladding alloy powder.

(4) sets of cylinder bore no copper materials are mostly nodular cast iron cylinder block, cylinder wall on the preparation of amorphous films or coatings. Because the cylinder bore wall with this particular material, so in order to form a hard – hard matching friction deputy. If the blind cylinder bore polishing, the surface of the cylinder bore wall material research out of this layer, the structural properties of friction more will change. Vice-friction coating to be removed, if the force used, the friction surface temperature will rise rapidly, the plunger rod and cylinder Kong Fasheng glue

5, the other plunger rod surface preparation in a unique film with a coating containing lubricating antifriction + Wear + functions, this group vice actual friction or hard – soft pair, people change once the coating, will destroy the best match of friction pair materials, repair of these special piston pump, it is necessary to a professional repair shop.

hydraulic efficiency of the system depends on the volumetric efficiency of hydraulic pumps, when the volumetric efficiency dropped to 72%, you need routine maintenance, replacement of bearings and seals of aging, to replace or repair the gap exceeds the friction with the deputy, its performance is restored.

1, the hydraulic pump: direct axis is divided into pressure piston pump swash plate type oil from oil-type two. Most oil-based hydraulic pressure using a pressure tank, but also the oil pump itself up with the wheel cylinder to the pump inlet pressure provides oil. Since the oil-type oil pump’s self-competence, without external supply. Pressure hydraulic oil tank, after each time you start the machine, must wait to use hydraulic pressure tank after the stains, to operate machinery. Such as lack of hydraulic pressure when the tank as the machine, the pump will cause whip pull off and slip phenomenon, the board will cause the pump body and the platen of the non-return to normal wear and tear. The piston pump oil used up, the use of 3000h, the operator checks the daily needs of the piston pump 1-2 times to check the sound is normal pump operation. Found to slow down or bored cylinder car, you should check for the disintegration of the charge pump, check whether there is scratch the impeller edge phenomenon, internal gear pump gap is too large.

2, for the self-suction type piston pump, the hydraulic oil tank shall not be less than the oil within the standard limit, to maintain a sufficient number of hydraulic oil. The higher the hydraulic oil cleanliness, longer pump life.

3, piston pump bearings is the most important parts of the bearing, the bearing clearance there is no guarantee that within three pairs of hydraulic friction pairs normal space, but also undermine the friction pair of hydrostatic bearing film thickness, reducing piston pump bearing life. According to information provided by pump manufacturer, the average bearing life of 10000h, this value needs to be replaced over the new port. Dismantled bearings, no professional testing equipment can not detect the bearing clearance, but to use visual, such as surface scratches found roller or discoloration, it must be replaced. When replacing the bearings, the bearings should be noted that the original letters and type, piston pumps were powered by large load bearing capacity of the bearing, it is best to buy the original manufacturer, the original specifications of the product, if the replacement of another brand, you should consult an experienced bearing look-up table for the exchange of personnel, the purpose is to maintain the accuracy of grade and load bearing capacity.

4, three pairs of friction deputy inspection and repair: pistons and piston cylinder hole according to the standard replacement parts, when parts of a variety of ultra-poor gap, the method of repair according to the following:

(1) cylinder sleeve insert mounted copper, copper can be used to replace the sets of methods to repair. First, a group of plunger rod diameter trimmed to uniform size, then more than 1000 # sandpaper polishing diameter. Copper cylinder sleeve installed three methods: (a) or copper cylinder sleeve installed plus hot extrusion temperature refrigeration, assembly interference; (b) adopt a Loctite glue the assembly, which we approach requires copper jacket diameter surface grooves; (c) cylinder hole tapping, thread processing copper sleeve outer diameter, coated with Loctite glue, screw assembly.

(2) melting and burning copper binding mode of the cylinder sleeve, repair as follows: (a) the use of ground rods, repair manual or mechanical grinding cylinder bore; (b) the use of coordinate boring machine, re-boring the cylinder hole ; (c) the use of reamers repair cylinder bore.

(3) the use of “surface engineering”, as follows: (a) plating technique: a layer of hard chrome plated piston; (b) brush plating techniques: the surface plating wear on plunger materials; (c) thermal spray or electric arc spraying or spray: spray high-carbon martensitic wear-resistant materials; (d) laser cladding: the plunger surface, high hardness wear-resistant cladding alloy powder.

(4) sets of cylinder bore no copper materials are mostly nodular cast iron cylinder block, cylinder wall on the preparation of amorphous films or coatings. Because the cylinder bore wall with this particular material, so in order to form a hard – hard matching friction deputy. If the blind cylinder bore polishing, the surface of the cylinder bore wall material research out of this layer, the structural properties of friction more will change. Vice-friction coating to be removed, if the force used, the friction surface temperature will rise rapidly, the plunger rod and cylinder Kong Fasheng glue

5, the other plunger rod surface preparation in a unique film with a coating containing lubricating antifriction + Wear + functions, this group vice actual friction or hard – soft pair, people change once the coating, will destroy the best match of friction pair materials, repair of these special piston pump, it is necessary to a professional repair shop.

manufacturing process compared with other institutions, the valve manufacturing process has the following characteristics:

① valve rough manufacturing process and inspection process more complicated.

valves rough castings are thin-walled shell structure called the complex pieces. Casting requirements of its smooth surface, cast the word clear, especially to have dense defects. To meet these requirements, casting a series of technological measures should be taken, such as the use of high refractoriness of the material and shape of sand moisture control, modeling the real fight should be to ensure the sand layer hardness, using reasonable pouring cap system and strict control of the mouth casting speed and temperature. As the technical requirements for high valve casting process than the general rough cast complex.

In addition, blank except check valve size, location accuracy and appearance, and some have as microstructure, mechanical properties, corrosion resistance and non-destructive testing and other tests, so the valve inspection process is more complex .

② valve installed on the machine parts more difficult

valve main parts of the structure, the shape is more complex, some parts are thin-walled, slender pieces, poor rigidity. In the machine tool, the positioning and clamping are more difficult, so complex and often require a special fixture.

some valve parts, the lower the accuracy of positioning the base surface, high surface roughness, and sometimes even non-machined surface orientation. The sealing surface to be machined parts such as accuracy and surface roughness requirements are high, it was difficult to ensure processing quality. Therefore, in order to meet the technology needs, the base surface is often required to improve the positioning accuracy and reduce the surface roughness, or in the non-machined surface orientation on the processing of the base surface, which increases the complexity of the valve manufacturing process.

③ machining difficult

the valve with a broad range of materials, in addition to a variety of cast iron, carbon steel, but most of its high strength, corrosion resistance and high hard cutting materials are very poor, difficult to achieve the required precision parts and surface roughness. The geometry of the valve sealing surface shape accuracy and surface roughness are very demanding and therefore more difficult to increase the valve machining. At the same time, cutting the valve material difference, and gave the valve processing methods, tool material, cutting, process equipment, so bring a lot of new problems.

port light, nautical light, cargo light

traditional port control valve out of the oil through a valve to be, to listen to two ports in the valve opening corresponding to the relationship as early as the design process to determine when, in the course can not be modified, so that the oil through two the mouth of the flow or pressure can not be controlled independently of each other.

1, the traditional single-spool valve defects

conventional single spool valve hydraulic system consisting of a reasonable solution of the following features is difficult and the contradiction between the control:

(1) hydraulic system designed to improve system stability and reduce the impact of load changes on the speed, or sacrifice some of the functions we want to achieve, or additional hydraulic components, such as control valves, pressure control valve, by increasing the damping, stiffness to improve system speed improve system stability. However, this component will reduce the increase in efficiency, waste of energy; also makes the whole system can be * reduced, increasing costs.

(2) As for the special structure allows the user to achieve a particular function must purchase the corresponding hydraulic components, coupled with construction machinery manufacturers will be based on different end-user requirements to design the corresponding function, this will cause procurement of similar manufacturers, multi-standard hydraulic control components to meet the needs of the different functional requirements, the product is not conducive to universal and product management, will also greatly enhance the product cost.

(3) As the executive body and out of hydraulic fluid through a valve to control both sides of the pressure control actuator alone is impossible. Therefore, the oil pressure acting on the dorsal movement of the actuator opposite direction, with the dorsal oil pressure, the executing agency for the shelf-life movement, into the oil side of the pressure must be increased. This will make the function of the hydraulic system increases consumption, low efficiency, heat increases.

dual-spool hydraulic system technology, as the executing agency out of the oil side of the spool valve port location and control separate, independently of each other, so that by two different combinations of spool control, the use of software programming can be very good solution to the traditional single-valve system can not solve the problem, but also can be easily achieved in conventional hydraulic systems difficult to accomplish.

2, two-spool valve are two basic control strategies

due to two dual-port valve for control flexibility, the two ports can be taken separately flow control, pressure control or flow pressure control. Positive introduce two simple control strategy.

(1) load direction remains unchanged throughout the course of their work

We know, for cranes, excavators, loaders and other terms of the hydraulic cylinder in the direction of the whole course of their work load is always maintained. Following the example of the hydraulic cylinder luffing crane to explore the dual spool control strategies.

cylinder luffing crane in the course of its work force, the load remains the same direction, so we can take control of the hydraulic cylinder rod with a pressure control chamber with no flow control rod control strategy.

rodless cavity flow control is not connected to the rod by detecting the side of the valve chamber on both sides of pressure before and after, according to the required amount of flow into or out of, to calculate the size of valve opening; rod chamber side with pressure control , so that the side to maintain a low pressure, making more energy efficient.

shipping lights, nautical light, marine light

Since we use a non-pole cavity flow control, so the original control system available balance valve used in a pilot-operated check valve instead. This will eliminate system instability caused by balancing valve, thereby enhancing the system stability.

(2) load direction of the change in the course of their work

In this case, to take “into the oil side of the pressure control, the oil side of the flow control” in the hydraulic cylinder rod chamber side with pressure control, there is no flow control rod side chamber.

same direction as the load, due to the oil side of the flow control, we can two-way balancing valve with check valve to replace, thereby enhancing the stability of the system. Into the oil side with a pressure controller to maintain a lower reference pressure, on the one hand to improve system efficiency, the other hand, the system does not occur cavitation.
To make changes in the load direction

body of work can be well controlled, the other a PI controller will be applied to the rod chamber of the pressure controller, when the load direction changes, no rod chamber pressure will be reduced; If the rod will still maintain a low pressure chamber, when the load is large, the hydraulic cylinder will reverse direction. At this point we can use to monitor the increase in PI controller rodless chamber pressure changes, when the PI controller detects that the lever cavity pressure is lower than the reference value, will increase rod chamber pressure controller set pressure, thus ensuring the system works.

valve the most obvious and one is not a question of comfort noise. For humans, noise can interfere with not only life, but also lead to permanent hearing failure and unsafe working environment. Studies have shown that long-term exposure to high noise levels, people’s hearing will be damaged. Hearing damage is progressive and irreversible, beginning with the high frequency failure, the top continues to fail the final hearing will result in a lower frequency of failure, which affects the ability to listen to normal language. When subjected to low frequency noise, the function of human organs such as heart or liver, may also be affected. In addition, noise and vibration will affect the associated performance and lead to valve pipe valve and adjacent equipment fatigue.

Essentially, when the vibration is generated in a wide range of atmospheric pressure changes, it will generate noise, and then as the noise transmitted to the eardrum. Eardrum to the speed of sound [which is 1100ft / s (335m / s) or 750m / h (1200km / h)] spread. Valve noise can be generated in many different ways, but the most common cause of valve geometry is generated by the turbulence caused by the spread of the downstream pipeline. In many cases, the noise could not help spread the valve body itself, because the body itself is rigid and sturdy.

marine light, boat headlights, marine equipment

process turbulence will produce the vibration of the valve or valve components. Noise from the valve assembly within the random vibration generated by pressure fluctuations caused by collisions or by the fluid logistics obstacles, such as spool and disk or other closure components caused by the vibration. When the closure element continue to impact its director, the long time will lead to an explosion of noise. Because its frequency is lower than 1500Hz, it does not interfere with normal observers. However, these stem or with a guide shaft can damage the explosion limits of orientation and the seat surface. Valve parts explosion noise of another deputy secondary benefit is that the noise generated within the turbulent pressure valve to provide a warning message, so corrected before the accident is required. Vibration can also be certain in its natural resonance frequency of the valve parts, or cause, they are often at a lower noise level (less than 100dBA) found. This type of noise is characterized by a single tone or sound Weng Weng (frequency 300 ~ 700Hz), which produce high levels of stress in the material, leaving the component materials caused by material fatigue and weak. Noise but also by hydrodynamic or aerodynamic sound caused by the fluid. For liquid handling, fluid power noise by flow, cavitation and turbulence caused by flash, or when the fluid produced by the contraction of cross-section caused by speed. In short, the logistics of liquid produced by the noise does not produce a high noise level and for staff to endure. In severe cavitation or flashing operation, noise levels can reach a higher level must be changed within the installation process or in the anti-cavitation valve components for disposal.