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In recent years, with the continuous development of global trade and the increase of ship transportation, marine valves, as an important part of ships, are also constantly innovating and developing. The functions of marine valves include controlling the flow of liquids and gases inside the ship to ensure the safety and normal operation of the ship. Here are the latest news in the field of marine valves: 1. Application of intelligent technology: With the continuous advancement of intelligent technology, marine valves have also begun to apply intelligent technology to achieve automated control and remote monitoring. These intelligent valves can monitor parameters such as flow, temperature and pressure inside the ship in real time through sensors, and automatically adjust the opening and closing of the valve according to set conditions. The application of this technology has greatly improved the operational efficiency and safety of ships. 2. Energy-saving and environmentally friendly design: In order to reduce the energy consumption of ships and their impact on the environment, the design of marine valves is increasingly focusing on energy saving and environmental protection. Some new valves use advanced materials and structures to reduce energy loss and leakage and improve the sealing performance of the valve. In addition, some marine valves are powered by renewable energy sources, such as solar and wind energy, further reducing dependence on traditional energy sources. 3. Application of anti-corrosion materials: Ships operate in a marine environment and are susceptible to corrosion by seawater. In order to extend the service life of marine valves, some new valves use anti-corrosion materials, such as special alloys and coating technologies. These materials can effectively resist seawater erosion and improve the durability of the valve. 4. Independent research and development and international cooperation: In order to meet the needs of the shipping industry, some domestic companies have begun to increase independent research and development of marine valves. At the same time, some companies are actively cooperating with internationally renowned companies and introducing advanced technology and equipment. This model of independent research and development and international cooperation has promoted the innovation and development of marine valve technology. In short, the innovation and development of marine valve technology are constantly moving towards intelligence, energy conservation and environmental protection, corrosion resistance and independent research and development. The application of these new technologies will further improve the safety and operating efficiency of ships and promote the sustainable development of the shipping industry.

On May 17, the Yangtze River Delta Regional Pump and Valve Industry Innovation and Development Forum, hosted by the Yancheng City Industry and Information Technology Bureau and the Binhai County People's Government and undertaken by Jiangsu Binhai Economic Development Zone, was held in Binhai. Wu Qibiao, secretary of the Binhai County Party Committee and county magistrate, attended Forum and address. The event invited Ma Yushan, an academician of the Chinese Academy of Engineering, Wang Wei, a professor-level senior engineer of the Hefei General Machinery Research Institute, and more than 200 entrepreneurs including all the governing units of Jiangsu and Henan Valve Industry Associations, and the governing units of Yancheng Valve Industry Association, gathered in China Binhai, a city of investment potential, talks about the deep integration of industrial chains and innovation chains. At the event site, Academician Ma Yushan of the Chinese Academy of Engineering gave a wonderful speech entitled "Current Status and Challenges of High-end Control Valves", expounding the key technologies of high-end control valves and challenging the upstream and downstream industry chains, which won rounds of applause from the audience. Wang Wei, a professor-level senior engineer of Hefei General Machinery Research Institute, made an introduction entitled "Exploration of the Development Direction of Intelligent Valve Industry", and Yuan Bin, Deputy General Manager of Jiangsu LNG Company, made an introduction entitled "Application Prospects of Cryogenic Valves in LNG Receiving Stations". Binhai is the "National Torch Binhai Fluid Equipment Characteristic Industrial Base". 9 central functional units, such as mould, coating, and surface treatment, implement the industrial foundation reengineering project, covering the whole life cycle services such as industrial funds, supply chain, talents, and employment, covering the whole process of enterprise production, operation, development and growth. The launching ceremony of the Jiangsu Binhai Pump and Valve Machinery Research Innovation Research Center was also held at the scene, and the School of Mechanical Engineering of Yancheng Institute of Technology and Jiangsu Binhai Economic Development Zone signed a strategic cooperation agreement.

Commonly used standard codes for marine valves: GB Chinese national standard GB/T Chinese national recommended standard GJB China National Military Standard CB China Shipbuilding Corporation standard CB/T China Shipbuilding Corporation recommended standard ISO International Standards International Organization for Standards ANSI American National Standards Institute American National Standards Institute DIN German National Standard Deutsches Institut für Normung e.V. JIS Japanese Industrial Standards Japanese Industrial Standards BS British National Standard British Standard NF French National Standard AFNOR ASME American Society of Mechanical Engineers Standard American Society of Mechanical Engineers ASTM American Society for Testing and Materials standard American Society for Testing and Materials AISI American Iron and Steel Institute Standard Acronym of American Iron and Steel Institute API American Petroleum Institute standard American Petroleum Institute MSS Manufacturers Standardization Society of the Valve and Fitting Industry MIL American military standard Military (U.S) JPI Japanese Petroleum Institute standard Japanese Petroleum Institute The names and codes of the classification societies of various countries for the type approval of marine valves: China Classification Society CCS American Bureau of Shipping ABS British Register of Shipping LR Bureau Veritas BV Det Norske Veritas DNV Kaiji Kyokai NK Korean Register of Shipping KR Russian ship registry RS Italian Register of Shipping RINA

According to the development needs of the valve industry, the forging branch has increased investment in investment and reform, and has recently added ring rolling machines with four specifications including 450 and 1000 (with axial rolling, rolling height 400) and matching hammers and pressure Machines and other ring parts production domestic leading equipment. And developed the most characteristic forged body ring parts in the valve industry, with mature forging technology and rolling technology. After the ring parts of the company's special ring-rolling processing technology are rolled, they have the following advantages: First, the material utilization rate is high and the production efficiency is high. Compared with other forgings, ring rolling parts are closer to finished products, which not only reduces the amount of processing, but also saves raw materials, materials and time, and reduces the price of forgings. The second is that the internal quality is particularly good: the deformation of the rolling ring is radial compression and circumferential extension. The metal fiber circumference of the ring is continuous and dense, and the orderly arrangement is compatible with the force and wear of the ring during use, so the strength of the rolling ring product is high. , and wear-resistant, particularly excellent internal quality. Third, the low price and high quality of ring rolling products make your products more competitive. Products suitable for rolling rings: flanges used in pipeline installation; valve bodies, balls, support rings in ball valves; gears, inner and outer rings of bearings, cylinders, rings, multi-step rings, etc.

Recently, the independent innovation of Shanghai Hudong Shipbuilding Valve Co., Ltd., a subsidiary of China Shipbuilding (Group) Co., Ltd. under China Shipbuilding Group, made a breakthrough. The company has successfully developed a complete product series of LNG marine large caliber ultra-low temperature hydraulic stop valves, whose main performance has reached the world's advanced level. Xiao Bu learned that this kind of valve is the core equipment in the ultra-low temperature liquid cargo system of the LNG ship. It has the characteristics of low temperature resistance, wide temperature range, low dissipation, long life, etc. The working temperature is - 163 ℃, the test temperature is - 196 ℃, and it has passed the ultra-high reliability test under the alternating temperature, fully meeting international standards. Since March, despite the impact of the epidemic, Hudong Shipbuilding Valve Co., Ltd. has tried every means to coordinate various resources to ensure that the ultra-low temperature project team continues to operate. Under the leadership of the chief technical expert, the members of the project team carried forward the spirit of "working together to overcome all difficulties and climb the peak", and made every effort to promote the technical breakthrough, continuously optimize the design scheme, and improve the process, breaking through key technical bottlenecks, achieving successful development, and realizing the full autonomy and controllability of the equipment. In recent years, the company has repeatedly made innovations in the whole LNG ultra-low temperature valve industry chain, firmly occupying the leading position in the market, and made important contributions to the localization of core equipment in the LNG industry chain.

Recently, the independent innovation of Shanghai Hudong Shipbuilding Valve Co., Ltd., a subsidiary of China Shipbuilding (Group) Co., Ltd. under China Shipbuilding Group, made a breakthrough. The company has successfully developed a complete product series of LNG marine large caliber ultra-low temperature hydraulic stop valves, whose main performance has reached the world's advanced level. Xiao Bu learned that this kind of valve is the core equipment in the ultra-low temperature liquid cargo system of the LNG ship. It has the characteristics of low temperature resistance, wide temperature range, low dissipation, long life, etc. The working temperature is - 163 ℃, the test temperature is - 196 ℃, and it has passed the ultra-high reliability test under the alternating temperature, fully meeting international standards. Since March, despite the impact of the epidemic, Hudong Shipbuilding Valve Co., Ltd. has tried every means to coordinate various resources to ensure that the ultra-low temperature project team continues to operate. Under the leadership of the chief technical expert, the members of the project team carried forward the spirit of "working together to overcome all difficulties and climb the peak", and made every effort to promote the technical breakthrough, continuously optimize the design scheme, and improve the process, breaking through key technical bottlenecks, achieving successful development, and realizing the full autonomy and controllability of the equipment. In recent years, the company has repeatedly made innovations in the whole LNG ultra-low temperature valve industry chain, firmly occupying the leading position in the market, and made important contributions to the localization of core equipment in the LNG industry chain.

Since the ball valve usually uses rubber, nylon and PTFE as the material of the seat seal, its operating temperature is limited by the material of the seat seal. The cut-off function of the ball valve is accomplished by pressing the metal ball against the plastic valve seat under the action of the medium (floating ball valve). Under the action of a certain contact pressure, the valve seat sealing ring undergoes elastic-plastic deformation in local areas. This deformation can compensate for the manufacturing accuracy and surface roughness of the sphere and ensure the sealing performance of the ball valve. And because the valve seat sealing ring of the ball valve is usually made of plastic, when choosing the structure and performance of the ball valve, the fire resistance and fire resistance of the ball valve should be considered, especially in the petroleum, chemical, metallurgical and other departments, in flammable and explosive media. If ball valves are used in the equipment and pipeline systems, more attention should be paid to fire resistance and fire protection. Usually, in two-position adjustment, strict sealing performance, mud, wear, shrinking channel, quick opening and closing (1/4 turn opening and closing), high pressure cut-off (large pressure difference), low noise, cavitation and gasification, Ball valves are recommended for pipeline systems with small amount of leakage to the atmosphere, small operating torque and small fluid resistance. The ball valve is also suitable for the pipeline system of light structure, low pressure cut-off (small pressure difference) and corrosive medium. Ball valves can also be used in cryogenic (cryogenic) installations and piping systems. In the oxygen pipeline system in the metallurgical industry, ball valves that have undergone strict degreasing treatment are required. When the main lines in oil pipelines and gas pipelines need to be buried underground, full-bore welded ball valves are required. When the adjustment performance is required, a ball valve with a special structure with a V-shaped opening should be selected. In petroleum, petrochemical, chemical, electric power, and urban construction, pipeline systems with a working temperature above 200 degrees

The butterfly plate of the butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0° and 90°. When it rotates to 90°, the valve is fully open. The butterfly valve is simple in structure, small in size and light in weight, and only consists of a few parts. And it only needs to rotate 90° to open and close quickly, the operation is simple, and the valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the resistance when the medium flows through the valve body, so the pressure drop generated by the valve is very small, so it has better flow control characteristics. Butterfly valves have two types of seals: elastic seal and metal seal. Elastic sealing valve, the sealing ring can be inlaid on the valve body or attached to the periphery of the disc. Valves with metal seals generally have a longer life than those with elastic seals, but it is difficult to achieve complete sealing. Metal seals can adapt to higher operating temperatures, while elastomeric seals have the disadvantage of being limited by temperature. If the butterfly valve is required to be used as flow control, the main thing is to correctly select the size and type of the valve. The structure principle of the butterfly valve is especially suitable for making large-diameter valves. Butterfly valves are not only widely used in general industries such as petroleum, gas, chemical, and water treatment, but also in cooling water systems in thermal power plants. Commonly used butterfly valves are wafer type butterfly valve and flange type butterfly valve. The wafer type butterfly valve uses stud bolts to connect the valve between the two pipeline flanges. The flange type butterfly valve has a flange on the valve, and the flanges at both ends of the valve are connected to the pipeline flange with bolts.

The opening and closing part of the gate valve is the gate, and the movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used mode gate valve form a wedge shape. The wedge angle varies with the valve parameters, usually 5°, and 2°52' when the medium temperature is not high. The gate of the wedge gate valve can be made into a whole, called a rigid gate; it can also be made into a gate that can produce a small amount of deformation to improve its manufacturability and make up for the deviation of the sealing surface angle during processing. The plate is called an elastic gate. When the gate valve is closed, the sealing surface can be sealed only by the medium pressure, that is, relying on the medium pressure to press the sealing surface of the gate to the valve seat on the other side to ensure the sealing of the sealing surface, which is self-sealing. Most gate valves are forcibly sealed, that is, when the valve is closed, the gate must be forced against the valve seat by external force to ensure the tightness of the sealing surface. The gate of the gate valve moves linearly with the valve stem, which is called a lift-rod gate valve, also known as a rising-rod gate valve. Usually, there are trapezoidal threads on the lift rod. Through the nut at the top of the valve and the guide groove on the valve body, the rotary motion is changed into a linear motion, that is, the operating torque is changed into an operating thrust. When the valve is opened, when the lift height of the gate is equal to 1:1 times the diameter of the valve, the fluid channel is completely unobstructed, but this position cannot be monitored during operation. In actual use, the apex of the valve stem is used as a sign, that is, the position where it cannot be opened, as its fully open position. In order to take into account the lock-up phenomenon due to temperature changes, it is usually opened to the apex position, and then reversed by 1/2-1 turn, as the position of the fully open valve. Therefore, the fully open position of the valve is determined according to the position of the gate, that is, the stroke. For some gate valves, the stem nut is set on the gate, and the rotation of the handwheel drives the valve stem to rotate, which makes the gate lift. This kind of valve is called a rotating stem gate valve, or a dark stem gate valve.

In recent years, many companies have also put forward the problem of preset production of large-scale marine valves (such as Φ5350mm in diameter) according to their needs. However, according to the existing marine valve preset manuals and corresponding standards, there is still a lack of relevant large-diameter marine valve design data, and there is also a lack of preset experience for large-scale marine valves. Because of this, it is necessary to carry out careful and accurate calculation and analysis, and it is necessary to carry out deformation and force analysis and calculation. Then the preset is executed according to its Z-post result. Therefore, it is ensured that it has a satisfactory tight seal and sufficient strength. However, due to the particularity of the marine valve structure, it is difficult to use the classical mechanical method to carry out the analysis and calculation, and only the finite element method is used for the analysis and calculation as deemed appropriate. It is considered appropriate to use the finite element method to analyze and calculate the valve body and disc of the Φ5350mm marine butterfly valve, so as to provide a theoretical basis for its reasonable structure and preset optimization, so as to prevent indispensable material consumption. The essence of the finite element analysis method is to idealize an elastic contiguous body with an infinite number of degrees of freedom into an ensemble of units with only a finite number of degrees of freedom through two approximations, so that the problem is simplified to a structural problem suitable for numerical solutions. The first approximation is the division of cells. Very accurate boundaries are broken down into simple boundaries. Consecutive objects are broken up into a series of elements that are only connected by nodes. Structural break up is also called grid division. The original elastic continuous body; the second approximation is the real and complex displacement distribution, which is approximately expressed in the result form after analysis Z, and the result after analysis and calculation can be seen intuitively. What needs to be explained here is that the development and practical application of the finite element analysis method so far have used a crucial tool: the use of computers in the actual calculation. Using the systematic software of the computer to carry out the analysis and calculation greatly increases the analysis speed and plays a very important role in practical applications. 1 Structure of marine valve This marine valve uses a positive structure as deemed appropriate. The valve body is a double flange plus ring rib type; the butterfly plate is a special-shaped plate type, and different types of ribs are reasonably placed on it. The workload of manual calculation is large, and because of this, three-dimensional finite element analysis software is used to perform the calculation. 2 Finite element calculation and analysis of valve body Structural dispersion is the basis of the finite element method. The so-called structural fragmentation is the aggregation of the elastic contiguous body to be analyzed into a finite number of units according to certain rules, so that adjacent units are connected at the nodes, and the load between the units is only transmitted by the nodes. Structural separation is also known as grid separation, and the unit aggregation formed by the separation will replace the original elastic contiguous body. First, establish a finite element plate type with a simple and concise structure of the valve body. 2.1 The boundary conditions are confirmed The deformation of the valve body is mainly affected by the weight of the valve body itself and the weight of other components of the marine valve (such as valve plate, power unit), because the weight of other components should be fully considered in the calculation. Variation calculation of valve body, load group Y-direction 3g gravitational acceleration, and load Y-direction and X-direction constraints on the bottom of the valve body. At the same time, considering the problem that the diameter of the marine valve is large, the pipe end effect will be revealed, because this needs to be done in the two-piece method. Load the marine valve Z-direction constraint on the blue. 2.2 Analysis of stress conditions Because the marine valve has a large front diameter, it is generally considered appropriate to use a steel plate welding structure, because the main consideration is the influence of the weight of the whole body of the marine valve on the valve body, so as to prevent the valve body from having a large self-weight deformation, thus affecting the marine valve. For the normal use of the valve, the acceleration of gravity is g, but in fact, considering the problem from the perspective of safety, we calculate it by 3g. Loading Y=3g, through finite element analysis and calculation, the self-weight deformation working condition of the valve body under 3 times the acceleration of gravity can be obtained. The following is the working condition of the valve body modification. It can be seen that the maximum modification amount is 0.6mm. 3 Finite element calculation and analysis of valve plate According to the past experience of marine valve design, first give a size of the main board and its ribs on the valve plate, because it belongs to the special-shaped plate, because this needs to accurately establish its group stiffness matrix, and do group finite element analysis, because this requires group construction. This can ensure the continuity and force dependence of the entire butterfly plate shape, and ensure that the calculated result is correct. 3.1 The boundary conditions are confirmed When working, the motor rotates together with the valve shaft and the valve plate through the speed reduction machine. The valve shaft transfers the torque to the valve plate through the joint on the valve plate. When the valve plate is subjected to the force of the fluid medium, it also transfers the force to the valve body through the joint, because the valve plate is subjected to the force of the fluid medium. The constraints at the last link should be: the three moving coordinates of X, Y, and Z should be limited, and their three rotational coordinates should also be limited. Therefore, the node of the corresponding unit that looks better than the photo of the inner wall of the joint piece is regarded as a fixed point, and its displacement and rotation angle are both zero. 3.2 Analysis of stress situation First, consider the effect of the fluid medium in question. In this default, the office pressure is 0.1MPa (1.0kg/cm2), but in fact, considering the problem from a safety point of view, we calculate it as Pressure=0.3MPa (3kg/cm2). Before and after the valve plate is deformed, the deformation occurs. The larger position of the deformation is at the Z outer point on the core surface of the rotary shaft of the valve plate. In this example, the larger deformation is Zmax=0.21mm. 4 Analysis of the results after Z The deformation analysis of the marine valve is that the main components of the marine valve will be deformed after being stressed. After the Z results, it is very convenient to carefully check and analyze the working conditions after the deformation, and analyze and compare the states before and after the deformation of the components. The deformation volume of the former official point of the component can also be obtained. After calculation and analysis, if the deformation of the component after being stressed exceeds the allowable range or the deformation is extremely small, the structure (such as thickness) is corrected, so a reasonable structure is obtained. The stress analysis of the marine valve is that the stress will be generated after the force analysis of the marine valve, and the larger stress on the component can be found out intuitively through the analysis of the results for yourself. Reasonable analysis and optimization are carried out, and the marine valves are strengthened by means of placing reinforcement bars and other forms in the position of high stress. It can be seen from the above analysis that after the stress analysis of the main components of the marine valve and the calculation and analysis of the deformation after the force, it is possible to find out the position with the larger stress and the larger deformation on the structure, and the two are combined to implement the structure of the marine valve. Correction, get a reasonable structure, ensure that it has sufficient strength and rigidity, prevent the structure from being bulky, lead to the consumption of materials, materials and energy materials, and reduce the cost of manufacturing. 5 The conclusion After the simulation analysis and calculation of marine valves, the following conclusions can be drawn: (1) The stress everywhere on the marine valve device can be calculated, and the stress value can be revealed, so the position with larger stress can be found and optimized, and the latent problem can be found in the preset stage of the product, so the number of attempts is reduced, so the loss is reduced. Try funding. (2) The deformation of the valve plate after being stressed can be displayed, and a little deformation value can also be obtained. In this example, the position where the valve plate is greatly deformed is the Z outer point perpendicular to the core surface of the valve plate rotation axis, which can be reinforced in a targeted manner to prevent the consumption of raw materials. (3) After calculation and analysis, the structural preset is rationalized and optimized to ensure that the preset object has sufficient strength and stiffness, saving resources and reducing costs. (4) The reliability of products and projects is guaranteed; the time to market for products is reduced. (5) Carry out accident analysis on the marine valves that have problems, and search for the cause of the problem. The application of finite element analysis technology in the design of marine valves has made a qualitative leap in the design level of marine valves. After the stress calculation and analysis of the key structures of marine valves, guiding opinions on the design of marine valves are given.

Stainless steel valve classification According to the performance characteristics and uses of the steel plate, it is divided into stainless steel plate, sulfuric acid-resistant stainless steel plate, pitting corrosion-resistant stainless steel plate, stress corrosion-resistant stainless steel plate, high-strength stainless steel plate, etc. According to the functional characteristics of the steel plate, it is divided into low temperature stainless steel plate, non-magnetic stainless steel plate, free-cutting stainless steel plate, superplastic stainless steel plate, etc. The commonly used classification method is to classify according to the structural characteristics of the steel plate, the chemical composition characteristics of the steel plate and the combination of the two. Generally divided into martensitic stainless steel, ferritic stainless steel, austenitic stainless steel, duplex stainless steel and precipitation hardening stainless steel, etc. or divided into two categories: chromium stainless steel and nickel stainless steel. Wide range of uses Typical uses: pulp and paper equipment heat exchangers, mechanical equipment, dyeing equipment, film processing equipment, pipelines, exterior materials for buildings in coastal areas, etc. What is a stainless steel check valve? Stainless steel check valve refers to the valve that automatically opens and closes the valve flap by relying on the flow of the medium itself to prevent the backflow of the medium, also known as check valve, one-way valve, reverse flow valve, and back pressure valve. The check valve is an automatic valve whose main function is to prevent the backflow of the medium, the reverse rotation of the pump and the driving motor, and the discharge of the medium in the container. Check valves may also be used on lines supplying auxiliary systems where pressure may rise above system pressure. Check valves can be mainly divided into swing check valves and lift check valves. The function of this type of valve is to allow the medium to flow in only one direction, and to prevent flow in one direction. Usually, this kind of valve works automatically. Under the action of fluid pressure flowing in one direction, the valve flap opens; when the fluid flows in the opposite direction, the fluid pressure and the self-coincident valve flap of the valve flap act on the valve seat, thereby cutting off the flow.

According to the structural characteristics of marine valves, marine valves can be divided into gate valves, globe valves (ball valves), check valves, safety valves, throttle valves, steam traps, etc. Marine gate valves are installed without directionality. The marine gate valve has the characteristics of small fluid resistance and wide applicable pressure and temperature range. The diameter shrinkage can reduce the size of the parts, the force required for opening and closing is correspondingly reduced, and at the same time, the application range of the parts can be expanded. However, after the diameter is contracted, the fluid resistance loss increases. The domestic low-pressure gate valve is generally made of cast iron material. The cast iron gate valve often has serious problems such as valve body freezing crack and gate falling off. The carbon steel stem of the cast iron gate valve is easy to rust, and the quality of the packing gasket is poor. 1. Serious internal and external leakage 1. Light weight: The body is made of high-grade ductile black cast iron, which is about 20%~30% lighter than the traditional gate valve, and is easy to install and maintain. 2. Overall lagging: The gate is made of high-quality rubber for the overall inner and outer covering. The first-class rubber vulcanization technology in Europe enables the vulcanized gate to ensure a good geometric size, and the rubber and the ductile cast gate are firmly connected, and it is not easy to Good shedding and elastic memory. 3. Flat-bottomed gate seat: The traditional gate valve often accumulates in the groove at the bottom of the valve due to foreign objects such as stones, wood blocks, cement, iron filings, sundries, etc. after the pipe is washed with water. The bottom of the elastic seat seal gate valve adopts the same flat bottom design as the water pipe machine, which is not easy to cause debris accumulation and makes the fluid flow unobstructed. 4. Precision casting valve body: The valve body adopts precision casting, and the geometric dimensions make the valve body's interior without any finishing to ensure the sealing performance of the valve.

Marine valves meet the environmental conditions of ships and are used to control the pressure, flow and flow direction of fluids in ship pipelines. Relevant industry certification required Requirements for marine valves: Resistance to salt spray (sea water) erosion; Minimal installation and operation space; Changes in position during use (to adapt to ship shaking) do not affect performance; The performance requirements under the materials and structures used to meet the above requirements.

The standard of marine valves can have a significant impact on the quality of valve products and the efficiency and economy of pipeline installations. In many cases, it is of great help to marine valve users. Marine valve standards can generally be divided into basic standards, material standards, product standards, component standards, structural element standards, inspection standards, etc. The basic standard mainly includes signs, supply requirements, structural length, connection dimensions, appearance requirements, etc. Our most commonly used standards are: GB/T584, GB/T585, GB/T586, GB/T587, GB/T588, GB/T589, GB/T590, GB/T591, GB/T592, etc. These standard valves can be divided into 2-6 varieties according to the nominal pressure. For the convenience of construction, we usually choose the same nominal pressure level.