Rubber lined butterfly valve and rubber lined gate valve their own characteristics and choice of rubber lined butterfly valve is mainly used in the oil, water and electricity and other fields, generally is a sealed structure.Due to the material problem, it is not suitable for use in high temperature and corrosive industry, but it is much stronger than the traditional butterfly valve high temperature resistance, but in the process of use actually to pay attention to the place or more, we will understand it in the process of use should pay attention to the place.1. Pay attention to its scouring positionEspecially in the state of the valve plate open, because if in the normally open state or positive scour, will directly affect its soft seal effect, so in formal use should avoid positive scour, maintain its basic seal performance.2. Pay attention to its specific use environmentBecause the structure of the line with rubber butterfly valve there is some difference with the other valves, so if you want to use words should be above the path DN200 valves environment, it is because of its valve plate is that one kind of thick, so the overall flow resistance is relatively large, if under this standard, effect is not very good, but also for the valve wear degree is higher.3. Stress issues need to be addressedIn the normal use of the process of high pressure, the pressure inside the valve is tight, if the pressure of the flow is greater than the pressure inside the valve, sealing performance will be affected, the flow will leak.These considerations are to improve the sealing performance of the rubber lining butterfly valve and extend its use time, so be sure to pay attention when using.The characteristics of this valve is more, with the basic advantages of the valve, but also has its unique, such as aging resistance, which is not many valves.Gate valve is one of the most common valves in our daily life. Today, I would like to introduce one of them -- rubber lined gate valve.Type of rubber lined valve brakeRubber gate valve type is more, from the drive mode can be divided into manual, pneumatic, electric and so on four, from structural mode and can be divided into bright bars and dark bar, if again subdivided into sealing structure can be divided into soft seal and hard seal, the commonly used material generally is cast iron, stainless steel, such as relatively hard material.Features of rubber lined gate valves1. Simple structure and good rigidityThe internal structure of this type of valve gate valve is very simple, because its parts are relatively few, and because the use of stainless steel, such a hard material, so the rigidity is better, the overall use time is relatively long.2. Simple operationThe volume of the gate valve lined with rubber is relatively small, and due to fewer internal parts, so the steps in the operation will not be too much, and maintenance is very convenient, do not need to spend a lot of effort, so the general staff training is able to master the operation and maintenance skills.3. Fewer restrictionsThe flow direction of the media of the rubber lined gate valve is not limited by various factors, and the valve itself will not disturb, and will not reduce the pressure brought by the flow, is less limited.These features are common to all its types, so no matter what type of rubber lined gate valve is available, and the application range is very wide, in the chemical, natural gas and other industrial sectors is common, in daily life can also be seen.
Gate valves are the most widely used of all types of valves.Gate valve refers to the closing parts (gate) along the channel mainly as cutting medium, that is, full open or full closed use.General gate valves should not be used for throttling.It can be used at high temperature and high pressure, and can be used in a variety of media.Gate valves are generally not intended for use in mud or viscous fluid lines.The disc of a gate valve moves in a straight line with the stem, called a lifting stem gate valve (also known as a rising stem gate valve).Usually there is a trapezoidal thread on the lifting rod, through the nut at the top of the valve and the guide groove on the valve body, to change the rotation motion to a straight line, that is, to change the operating torque to the operating thrust.Some valves, stem nuts located in the gate, handwheel rotation drives the stem rotation, which causes the gate to lift, such valves are called rotary stem gate valves or dark stem gate valves.Gate valves have the following advantages:1. Low fluid resistance;2. Small torque required for opening and closing;3. It can be used in the loop network management road where the medium flows in two directions, that is, the flow direction of the medium is not restricted;4. When fully open, the sealing surface is less eroded by working media than the globe valve;5. The shape is relatively simple and the manufacturing process is good;6. Small structure length;Because gate valves and have many advantages, so the use of a wide range.Usually, the pipeline with nominal size ≥DN50 is used as the device for cutting medium. Even in some small-bore official roads, some gate valves are still retained at present.
Valve corrosion is the main cause of valve failure. Chemical corrosion and electrochemical corrosion are two forms of valve corrosion.The corrosion rate of the valve depends on the temperature, pressure, and chemical properties of the valve runner stop valve. Repair or replacement is required if the valve seal corrodes.Valve corrosion can not be completely eliminated, we can do a good job through the technical means of corrosion treatment, effectively reduce the corrosion of the valve.First of all, to understand the corrosion rate, corrosion rate is the unit time consumption of body material thickness, through the corrosion rate can determine the service life of the valve, and whether there is excessive corrosion of the valve, and whether there is a problem in the selection and use of the valve.1. Complete corrosion resistance: the corrosion rate is less than 0.001mm/year;2. Extreme corrosion resistance: the corrosion speed is 0.001 to 0.01mm/year;3. Corrosion resistance: corrosion speed: 0.01 to 0.1 mm/year;4. Corrosion resistance: corrosion speed: 0.1 to 1.0 mm/year;5, poor corrosion resistance: corrosion speed 1.0 to 10 mm/year;6. No corrosion resistance: the corrosion rate is more than 10 mm/year.What corrosion protection measures are in place during valve manufacturing and design?1, the first is the selection of material, which is the most important factor to prevent valve corrosion.Usually, water, oil, gas are usually cast steel valves, if containing acid and alkali and other corrosive media will choose stainless steel, generally controlled in the use temperature of 200 degrees below, stainless steel in the medium will produce a passivation film, to prevent further corrosion.Very corrosive medium you need to use very high temperature you need to choose super corrosion resistant alloy materials.The medium is reducibility, the stainless steel material containing Mo is selected.Medium is oxidizable, choose stainless steel material containing Cr.2, surface coating paint coating valve surface is a commonly used anti-corrosion means.Epoxy resin paint is applied to the surface of the gate valve with elastic seat seal3, the lining material is used to isolate the medium from the valve body flow path, the lining material includes lining engineering plastics, lining natural rubber and various synthetic rubber, etc.It can only be used in low pressure and low working temperature.4, surface plating valve surface chrome plating, nickel plating, copper plating can also effectively achieve the effect of corrosion prevention.
The size of the product in the diagram is DN1200, the company can also achieve DN1500 and slightly larger size.
Check valve is a kind of automatic opening and closing valve that does not need manual or other operation. It depends on the flow of the pipeline medium itself to open or close the valve. It is mainly used to prevent the reverse flow control of the pipeline medium.Check valve only one direction of flow, that is, can only flow along the inlet can not reverse, medium reverse flow when the disc is closed.Check valves are generally installed to prevent backflow of media when the valve is not closed.Like common water pump outlet will be installed check valve, prevent high pressure water pouring into the pump, pump impeller or other parts due to hydraulic impact loose or damaged, resulting in accidents.In general, check valves are used in piping or equipment to prevent backflow of media.The principle of the check valve is very simple, as shown in the figure, the medium flows in the specified direction, when the flow pressure exceeds the opening pressure of the check valve, the disc is pushed open under the action of the fluid pressure, thus connecting the flow of the pipeline medium.On the contrary, when the pipeline medium is reversed to the backflow, under the pressure of the fluid, the disc is pressed on the check valve body, at this point the valve is closed, thereby cutting off the pipeline medium flow.And the greater the pressure of the backflow medium, the valve disc closed more tightly, the better the sealing effect, completely put an end to the possibility of media backflow.Check valve according to the structure of the different forms, can be divided into lifting type, swing and butterfly three, lifting type can be divided into vertical and horizontal two, its movement is along the axis of the movement.Swing can be divided into single-valve, double-valve and multi-valve, which work by rotation of the center of gravity.And thin butterfly structure for straight flow, by the spring on the hinge pressure in the seat to seal.
Fire valve is an important accessory for the control of industrial and building pipelines. It is a kind of valve with high control precision, especially for the control of flow.At present widespread use in the industrial control system, in the use of the process will often appear a variety of problems to trouble us, this small make up mainly about the fire valve leakage reasons and treatment methods.1, from problems due to the analysis on the causes and solutions, d/repair personnel at the time of processing or assembling due to the process, the influence of the internal leakage is likely to cause electric regulator appeared, at this time is mainly due to the relatively fixed limit switch action, in the control medium of regulator of scour at run time and pattern, will cause the valve doesn't close on the cause of leakage phenomenon.We should mainly adjust the position of the limit switch, we can solve this phenomenon.2. Improper debugging of fire valve resulted in internal leakage.Due to the failure of the electric control valve in the control part, the valve limit switch, over-torque switch and other reasons lead to the sealing surface of the wear or corrosion, which will also cause internal leakage.We should still work on adjusting the limit switch.3. Because the zero setting of the electric actuator is not accurate, this is the reason why the valve cannot close completely and leak inside.The main adjustment method is to close the valve manually, or to close the valve manually and then turn back half circle, which will adjust and adjust the limit.4, the valve is the closing type of push down, if the actuator's thrust is not big enough, it will lead to the valve can not be fully closed and internal leakage.The main solution is to replace the large thrust of the actuator to solve.
1, small and light, easy to disassemble and repair, and can be installed in any position.2, simple structure, compact, 90° rotation opening and closing quickly.3. Small operating torque, light and labor-saving.4, flow characteristics tend to straight line, good regulation performance.5, opening and closing tests up to tens of thousands of times, long life.6, to achieve complete sealing, gas test leakage is zero.7, manual butterfly valve has a simple structure, light weight, material consumption saving, small installation size, small driving torque and other characteristics, used to cut off, put on, adjust the medium in the pipeline, with good fluid control characteristics and sealing performance.8, manual butterfly valve can transport mud, the least liquid accumulation in the pipe mouth.Good sealing can be achieved under low pressure.Good adjustment performance.9. The linear design of the butterfly plate makes the loss of fluid resistance small, so it can be said that it is an energy-saving product.10, manual butterfly valve stem for the rod structure, after conditioning treatment, has a good comprehensive mechanical properties and corrosion resistance, abrasion resistance.When manual butterfly valve opens and closes, the valve stem only makes the rotation movement and does not make the rise and fall movement, the valve stem packing is not easy to destroy, the seal is reliable.It is fixed with the butterfly plate taper pin, and the overhanging end is designed to prevent the valve stem from bursting out when the valve stem and butterfly plate are accidentally broken.The driving form has the manual, the worm wheel transmission, the electric, the pneumatic, the hydraulic, the electric hydraulic linkage and so on, may realize the far control and the automation operation.
Gate valve is a gate with open and close parts, the movement direction of the gate is perpendicular to the direction of the fluid, the gate valve can only be fully open and fully closed, can not be adjusted and throttle.Gate valves are sealed by contact between the seat and gate. Usually, the sealing surface is surfacing welded with metal materials to increase wear resistance, such as surfacing 1Cr13, STL6, stainless steel, etc.The gate has the rigid gate and the elastic gate, according to the gate different, the gate valve is divided into the rigid gate valve and the elastic gate valve.The opening and closing part of gate valve is the gate, the movement direction of the gate is perpendicular to the direction of the fluid, gate valve can only be fully open and fully closed, can not be adjusted and throttle.The gate has two sealing faces, the two sealing faces of the gate valve in the more common mode form a wedge, the wedge Angle varies with the valve parameters, usually 5°, medium temperature is not high 2°52'.Wedge gate valve gate can be made into a whole, called a rigid gate;It can also be made into a small deformation of the gate, to improve its process, to compensate for the Angle of the sealing surface in the process of the deviation, this kind of gate is called elastic gate.When the gate valve is closed, the sealing surface can be sealed only by the pressure of the medium, that is, the pressure of the sealing surface of the gate to the other side of the seat to ensure the sealing surface, this is self-sealing.Most gate valves are used for forced sealing, that is, when the valve is closed, to rely on external force to force the gate to the seat, in order to ensure the sealing surface of the seal.Gate valve gate with the stem for linear movement, called lifting stem gate valve, also called rising stem gate valve.Usually there is a trapezoidal thread on the lifting rod, through the nut at the top of the valve and the guide groove on the valve body, the rotation movement into a straight movement, that is, the operation torque into the operation thrust.When the valve is opened and the gate is raised to a height equal to 1:1 of the valve size, the flow path is completely clear, but this position cannot be monitored during operation.The actual use of the stem is marked by the apex of the valve, that is, the open position, as its full open position.In order to consider the temperature change of the lock phenomenon, usually open to the vertex position, and then rewind 1/2-1 turn, as the position of the fully open valve.Therefore, the fully open position of the valve is determined by the position of the gate, i.e. the stroke.Some gate valves, the stem nut is on the gate, the handwheel rotation to drive the stem rotation, and the gate lift, this valve is called the rotary stem gate valve, or called the hidden stem gate valve.
Globe valve, throttle valve, pressure reducing valve, check valve and other valves are directional, if installed upside down, throttle valve will affect the service effect and life;Relief valves do not work and check valves can be dangerous.General valve, on the valve body has direction marking;If not, the valve should be correctly identified according to the working principle.The valve chamber of the globe valve left and right asymmetry, the fluid to let it from the bottom up through the valve port, so that the fluid resistance is small (by the shape of the decision), open energy saving (due to the media pressure upward), closed after the media pressure packing, easy to repair.This is why the globe valve cannot be installed backwards.Other valves have their own characteristics.Valve must be installed in a position that is easy to operate;Even if the installation is temporarily difficult, keep the operator's long-term work in mind.Best valve handwheel and chest (generally from the operation floor 1.2 meters), so that the valve is more energy saving.Landing valve handwheel to face up, do not tilt to avoid awkward operation.Rely on the wall machine by the valve of the equipment, also want to leave the operator standing room.To avoid operation, especially acid and alkali, toxic media, otherwise it is not safe.Gate valves should not be inverted (i.e., handwheel down), as this will leave medium in the bonnet space for a long time, prone to corrosion of the stem, and is prohibited by some technical requirements.It is extremely inconvenient to replace the packing at the same time.1, the pressure reducing valve to be installed upright in the horizontal pipeline, all directions do not tilt.2, lifting check valve, installation to ensure that the disc is vertical, so as to lift flexible.3, swing type check valve, installation to ensure that the pin shaft level, in order to swing flexible.4, open stem gate valve, do not install in the ground, or due to moisture and corrosion exposed stem.
Clean parts must be kept sealed for installation.Requirements for the installation process are as follows:1. The installation workshop must be clean, or a temporary clean area should be built, such as newly purchased color strips or plastic film, to prevent dust from entering during the installation process.2, assembly workers must wear clean cotton work clothes, the head wear a pure cotton cap, hair can not leak, feet wear clean shoes, hands wear plastic gloves, fat,.3. Assembly tools must be degreased before assembly to ensure cleanliness. Other requirements1. The assembled valve shall be purged with nitrogen for at least 1 minute.2. The air tightness test must be conducted with pure nitrogen.3. After passing the air-tightness test, the packing shall be sealed with a clean polyethylene cap. The polyethylene cap shall be soaked with organic solvent and wiped clean before use.4. Then seal with a vacuum bag.5. Final packing.6. During transportation, measures should be taken to ensure that the package is not damaged.
The delivery cycle will vary depending on the quantity of the actual order.For example, the company can assemble about 1000 valves of DN100 size every day.
The outbreak of covid-19 had little impact on the company's export business, because the company's customers are long-term cooperation for many years, and the role of valves in industrial construction cannot be replaced, orders will be delayed, but will not be absent.
Due to the different sizes of valves, it is difficult to assess the specific amount of assembly in a single day. For example, with the minimum DN50, about 1500 units can be assembled every day.
1. High credibility of the manufacturer.From the perspective of the use position of the valve, the valve of the quality and performance is critical, and only creditworthiness high valve manufacturer to ensure the product quality standard, so as to produce nuts customer trust of the valve, and the manufacturer to establish credibility is not easy, it requires not only the valve manufacturer to constantly develop new products, but also in the strict control of product quality and improve service levels at the same time, establish a unique corporate culture, only so manufacturers can be worth cooperation of valve manufacturers.2. Advanced technology of products independently developed by the manufacturer.Although the valve production technology already quite mature, but the market demand increasingly update, valve manufacturers want to progress, steps can be followed up, so there is no self product updates, and stop valve manufacturer does not conform to the market demand, only can independent research and development products, and can produce a strong performance in the industry, advanced technology valve is able to meet customer demand, high quality products will gain market recognition.3. The product price conforms to the market requirements.Application because the valve product industry is different, so the price and its type must have very big distinction, and for the customer, only can according to the performance of the valve position, type, application, use the lifespan and the services provided by the price of the valve manufacturer, can be more transparent, price advantage, thus increasing customer choice.In addition, this is also cost-effective valve manufacturers must have one of the characteristics.All in all, decided to choose which is the product of the valve manufacturer in the actual effect and use safety of customers using the product is critical, through a variety of textual research and summarize, we found that only their own credibility, its products conform to the requirements of the market price, advanced technology, can be independent research and development new valve manufacturer just worth customer cooperation.