In modern fishery and aquaculture,PVC pipesare widely used in the field of water supply pipelines for fishery and aquaculture by virtue of their own performance advantages. At present, the main fishery breeding projects include marine aquaculture, freshwater aquaculture, ornamental fish breeding, and large-scale supermarket fish tank matching projects.
1. The advantages of PVC pipes in fishery breeding:
a. PVC pipes PVC products adopt environmentally friendly organic tin formula. There is no heavy metal precipitation in the pipes during the water supply process, which will not cause secondary heavy metal pollution to the water quality. The survival rate of fish fry is higher than that of pipes made of general materials.
b.PVC pipes are connected by adhesive connection or live rubber ring connection, which is convenient and fast for construction and saves construction costs;
c.The pipe wall of PVC pipe is smooth, and its resistance to fluid is very small, and its roughness coefficient is only 0.009. Compared with other pipes of the same caliber, it has a large flow rate and does not adhere to scale.
2. PVC pipes commonly used in fishery and aquaculture pipe specifications:
a. Large-scale farms such as marine aquaculture and freshwater aquaculture generally use Φ20-Φ315 pipes, of which the main pipeline Φ110-Φ200 is more commonly used. According to engineering conditions, pipes with pressure ratings of 0.63MPa or 1.0MPa are generally selected.
b. Ornamental fish breeding and large supermarket fish tank piping generally use Φ20-Φ63 small-diameter pipes.
Processing modifiers can promote the plasticization of PVC primary particles of PVC pipes, lower the plasticization temperature, and may also weaken the adverse effects of external lubricants. Adding an appropriate amount of ACR processing aids can shorten the plasticization time, improve the plasticization efficiency, and avoid melt Rupture, improve the finish of the product, and make the product have good appearance quality and mechanical properties. ACR is a processing modifier and also has certain impact resistance. If it is added in excess, the shear friction heat will be greater, the material will be excessively plasticized, and the product will appear yellow. , The tensile yield strength decreases.
Lubricants can be divided into internal lubricants and external lubricants according to their functions. Generally speaking, internal lubricants have greater compatibility with PVC pipes and PVC, and they can enter between PVC molecules, thereby reducing the force between PVC molecules. Promote PVC plasticization, external lubrication has poor compatibility with PVC, it reduces the friction between the material and the equipment, and improves the fluidity to push PVC plasticization.
We are a professional manufacturer of PVC pipes. All countries in the world use our pvc pipes for piping projects.
The plastic ball valve is suitable for the interception of the conveying process with corrosive medium, and the temperature is -14℃～100℃, -40℃～140℃ according to different materials. All parts are assembled by RPP or PVDF injection molded parts, and the plastic ball valve has excellent corrosion resistance. The sealing ring adopts F4. Excellent corrosion resistance and prolong service life. Flexible rotation and easy to use. Plastic ball valve The integral ball valve has few leakage points, high strength, and the connection type ball valve is easy to assemble and disassemble. Classification of plastic ball valves: flanged plastic ball valves, threaded plastic ball valves, socket plastic ball valves, double-Yoring plastic ball valves.
Plastic ball valves have lightweight and strong corrosion resistance and are used in many fields, such as general pure water and raw drinking water piping systems, drainage and sewage piping systems, saltwater and seawater piping systems, acid-base and chemical solution systems, etc. In many industries, quality has been recognized by the majority of users.
The plastic ball valve is mainly used to cut off or connect the medium in the pipeline. It can also be used for fluid adjustment and control. Compared with other valves, it has the following advantages. 1. The fluid resistance is small, and the ball valve is the smallest fluid resistance of all valves. Even with the reduced diameter ball valve, its fluid resistance is quite small. The UPVC ball valve is a new material ball valve product developed in recent years according to the needs of various corrosive pipeline fluids. Product advantages: lightweight, strong corrosion-resistance, compact and beautiful appearance, lightweight and easy installation of the body, strong corrosion resistance, wide application range, hygienic and non-toxic materials, wear resistance, easy disassembly, simple maintenance. In addition to UPVC ball valve, plastic ball valves also include RPP ball valves, PVDF ball valves, PPH ball valves, CPVC ball valves, and PPR ball valves.
The plastic ball valve has the characteristics of simple structure, small size, lightweight, low material consumption, small installation size, rapid switching, 90° reciprocating rotation, and small driving torque. It is used to cut off, connect and adjust the medium in the pipeline. Good fluid control characteristics and closing and sealing performance.
The plastic ball valve can transport mud, and the liquid accumulation in the pipe mouth is the least. Under low pressure, good sealing can be achieved. Good adjustment performance. The streamlined design of the plastic ball valve makes the fluid resistance loss small, which can be described as an energy-saving product.
Structural features
The valve stem is a through-rod structure, after quenching and tempering, it has good comprehensive mechanical properties, corrosion resistance, and scratch resistance. When the ball valve is opened and closed, the valve stem only rotates and does not move up and down, the packing of the valve stem is not easy to be damaged, and the sealing is reliable. It is fixed with the butterfly plate cone pin, and the extended end is designed to prevent the valve from breaking out, so as to prevent the valve stem from collapsing when the connection between the valve stem and the butterfly plate is accidentally broken. The connection methods include flange connection, butt connection, butt welding connection, and lug butt connection. The driving forms include manual, worm gear transmission, electric, pneumatic, hydraulic, electro-hydraulic linkage, and other actuators, which can realize remote control and automatic operation. The disadvantages of ball valves are as follows:
1. The working pressure and working temperature range are small.
2. Poor airtightness.
Working principle
The relationship between the opening of the plastic ball valve and the flow rate basically changes linearly. If it is used to control flow, its flow characteristics are also closely related to the flow resistance of the piping. For example, two pipelines are installed with the same valve diameter and form, but the pipeline loss coefficient is different, and the flow rate of the valve will also be very different.
If the valve is in a state with a large throttle range, the back of the valve plate is prone to cavitation, which may damage the valve. Generally, it is used outside 15°.
When the plastic ball valve is in the middle opening, the shape of the opening formed by the valve body and the front end of the butterfly plate is centered on the valve shaft, and the two sides are formed to completely different states. The front end of the butterfly plate on one side moves in the direction of the flow of water, and the other side is counter to the direction of the flow. Therefore, one side of the valve body and the valve plate form a nozzle-like opening, and the other side is similar to a throttle opening. The nozzle side has a much faster flow rate than the throttle side, and negative pressure will be generated under the throttle side valve. Rubber seals often fall off.
Plastic ball valves and butterfly rods have no self-locking capability. For the positioning of the butterfly plate, a worm gear reducer must be installed on the valve rod. The use of a worm gear reducer can not only make the butterfly plate self-locking and stop the butterfly plate at any position but also improve the operating performance of the valve.
The operating torque of the plastic ball valve has different values due to the opening degree and the valve opening and closing direction. The horizontal ball valve, especially the large diameter valve, due to the depth of water, the torque produced by the difference between the upper and lower water heads of the valve shaft cannot be ignored. In addition, when an elbow is installed on the inlet side of the valve, a bias flow is formed and the torque will increase. When the valve is in the middle opening, the operating mechanism needs to be self-locking due to the action of the water flow torque.
The plastic ball valve has a simple structure, consisting of only a few parts, and saves material consumption; small size, lightweight, small installation size, small driving torque, simple and rapid operation, only need to rotate 90 ° to quickly open and close; and At the same time, it has good flow regulation function and closing and sealing characteristics. In the application field of large and medium caliber, medium and low pressure, the plastic ball valve is the dominant valve form. When the ball 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 small, so it has better flow control characteristics. The ball valve has two sealing types: 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 butterfly plate.
Valves with metal seals generally have a longer life than valves with elastic seals, but it is difficult to achieve a complete seal. The metal seal can adapt to higher working temperature, while the elastic seal has the defect of being limited by temperature. If the ball valve is required to be used as alow control, the main thing is to correctly select the size and type of the valve. The structural principle of the ball valve is particularly suitable for making large-caliber valves. Ball valves are not only widely used in general industries such as petroleum, gas, chemical, water treatment, etc., but also used in cooling water systems of thermal power stations.
Commonly used ball valves include wafer butterfly valves and flange butterfly valves. Wafer-type ball valves are connected between two pipe flanges with stud bolts. Flange-type ball valves are equipped with flanges on the valve. The flanges on both ends of the valve are connected to the pipe flanges with bolts. The strong performance of the valve refers to the ability of the valve to withstand the pressure of the medium. The valve is a mechanical product that bears internal pressure, so it must have sufficient strength and rigidity to ensure long-term use without cracking or deformation.
With the application of anti-corrosion synthetic rubber and polytetrafluoroethylene, the performance of the ball valve can be improved and meet different working conditions. In the past ten years, metal-sealed ball valves have developed rapidly. With the application of high temperature, low temperature, strong corrosion-resistance, strong erosion resistance, and high-strength alloy materials in butterfly valves, metal sealed ball valves have become It has been widely used under other working conditions and partially replaced the globe valve, gate valve, and ball valve.
Our professional plastic ball valve manufacturer, if you need to buy plastic ball valve, please contact me.
PVC pipe is a kind of pipe made of special materials. Because of its thermal insulation effect, it is sometimes used as a hot water pipe. At the same time, because of its thermal insulation performance, it is commonly used by us. Regarding how the PVC pipe achieves the thermal insulation effect, this is also our topic today, so that we can have a certain understanding of how its performance is reflected.
1. The raw material of PVC pipe is sanitary polyvinyl chloride resin, which is widely used in indoor water supply in residential areas, urban water supply pipelines, marine aquaculture, etc. The insulation of PVC water supply pipes and equipment should be carried out after the anti-corrosion and water pressure tests are qualified. If the insulation layer is required, the joints and welds of the pipes should be set aside, and the joints should be insulated after the water pressure test is qualified. 2. If the building’s ceiling and pipe well need to be insulated pipes, they should pass the anti-corrosion pressure test, and the civil works can be closed after the completion of the insulation test. Reversing the process is prohibited. 3. It is necessary to clean up the debris in the trench pipe well before heat preservation. The debris left in the construction process should be cleaned up at any time to ensure that the trench is cleared. 4. Pay attention to the mortar protective shell during the heat preservation operation, and the PVC water supply pipe should have anti-freezing methods during the winter application. The PVC pipes with thermal insulation effect allow us to use warm water at all times in the cold season, so that we no longer have to use cold water passively, making our water more convenient.
PVC pipe is a pipe product with strong toughness, good heat resistance, and good ductility. It consists of three parts: the upper layer, the middle layer, and the lower layer. The upper layer of the PVC pipe is a layer of the paint film, which plays the role of waterproof and anti-aging; the middle layer is the polyvinyl chloride layer, which is the main base layer; and the lower layer is the back-coated adhesive. There are many types of PVC pipe specifications because its uses can be divided into water pipes and line pipes, so there are many categories of products, so you must understand the specifications of PVC pipes when purchasing. The following editor will introduce the classification and size model of PVC pipes.
PVC pipe specifications and classification
PVC pipes can be divided into soft PVC drainage pipes and hard PVC pipes according to their different properties. The main difference is whether they contain plasticizers. The soft PVC pipe contains softener, so the physical properties are relatively weak, it is not easy to store, can not withstand certain water pressure, and the scope of use is limited. Therefore, soft PVC pipes are usually used on ceilings, floors, and leather surfaces, and are often used as line pipes.
Rigid PVC pipe does not contain plasticizer, it is easy to shape during production, not easy to be brittle, non-toxic and pollution-free, has long storage time, and has very good physical properties. Hard PVC pipes are usually used as drainage pipes and water delivery pipes, which have great development and utilization value.
The market share of soft PVC pipes is only one-third, while hard PVC pipes occupy two-thirds. The raw material of PVC pipe is not completely environmentally friendly, but environmentally friendly additives can be used to make it a non-toxic and tasteless environmentally friendly product.
A detailed explanation of PVC pipe specifications
The size of the PVC pipe should be distinguished according to its type. The nominal outer diameter of different types of PVC pipes is different. The nominal diameter of the soft PVC pipe is 50mm, which generally does not exceed this size. The nominal diameter of hard PVC pipes can be made larger, even 50cm in size.
The size of soft PVC pipe is implemented according to GB/T13527.1-1992 standard, and the size of hard PVC pipe is implemented according to GB/T13020-1991 standard. Commonly used are 2.5mm, 3mm, 4mm, 5mm, 6mm, etc.
The larger sizes are 400mm, 450mm, 500mm, 560mm, 630mm, 710mm, 800mm, 900mm, 1000mm.
PVC pipes have different pressure levels. Commonly used ones are: 0.2Mpa, 0.3Mpa, 0.6Mpa, 1.0Mpa, 1.6Mpa, and regular products are marked with this value on the pipe wall.
PVC pipe specifications and models
1. PVC pipes are often used as threading pipes. Soft PVC pipes are usually used. The pipes have good toughness and good ductility. Common sizes are 16mm, 20mm, 25mm, 30mm, 40mm, 50mm. 2. PVC pipes are also widely used as water pipes, which can be used in household environments, commercial places, and industrial fields. The water delivery pipe is a hard PVC pipe, which has good strength, strong aging resistance, and long service life. The nominal diameter of the water supply pipe is larger than that of the threaded pipe but not as large as the drain pipe. Usually there are 20mm, 25mm, 32mm, 40mm, 50mm, 63mm, 75mm, 90mm, 110mm, 200mm, etc. Smaller ones are used in the home environment, and large amounts of water are sent in the industrial environment. 3. The performance requirements of PVC drainage pipes as drainage pipes are high, not only having a good surface hardness, meeting safety factors, and high tensile strength and aging resistance requirements. In order to meet industrial discharge requirements, PVC drainage pipes must also have a certain degree of acid and alkali resistance. The nominal diameter of the drainage pipe is larger than all PVC drainage pipes. Generally, a diameter below 160mm can be used in the household environment. The main drainage pipe and industrial sites can choose 200mm, 250mm, 315mm, 400mm, 500mm, and other sizes.
PE water supply pipe is a flexible pipe made of high-density polyethylene (HDPE) as raw material, which is extruded and vacuum-formed, and has smooth inner and outer walls. It is mainly used for the construction of urban water pipe networks. As a tap water pipe network construction requirements are very strict, it is checked by various departments, there must be advantages that other pipelines do not have!
1. The pe tube connection is very reliable
The PE water supply piping systems are connected by hot-melt socket and hot-melt butt joints. The strength of the joint is higher than the strength of the PE water supply pipe itself; the polyethylene pipe and other pipes are connected by flanges, which is convenient and quick.
2. Good impact resistance at low temperature
The low-temperature embrittlement temperature of polyethylene is extremely low, and it can be used safely in the temperature range of -60℃-60℃. During winter construction, because the polyethylene pipe has good impact resistance, it will not be embrittled.
3. Has strong resistance to stress cracking
It has low notch sensitivity, high shear strength, and excellent scratch resistance, and its resistance to environmental stress cracking is also very outstanding.
4. Good chemical resistance
PE water supply pipe can withstand the corrosion of a variety of chemical media, and the chemical substances in the soil will not cause any degradation to PE water supply pipe.
5. Anti-aging and long service life
Polyethylene pipes containing 2-2.5% evenly distributed carbon black can be stored or used outdoors for 50 years, and the polyethylene pipes will not be damaged by ultraviolet radiation.
6. Good wear resistance
The comparison test of the wear resistance of PE water supply pipes and steel pipes shows that the wear resistance of PE water supply pipes is 4 times that of steel pipes. In the field of mud transportation, compared with steel pipes, PE water supply pipes have better wear resistance, which means The PE water supply pipe has a longer service life and better economy.
7. Has the good winding ability
The flexibility of the PE water supply pipe makes it easy to bend. In engineering, obstacles can be bypassed by changing the direction of the PE water supply pipe. In many cases, the flexibility of the PE water supply pipe can reduce the amount of polyethylene water delivery pipes for agricultural irrigation and reduce installation costs.
8. Small resistance to water flow
The PE water supply pipe has a smooth inner surface, and the PE water supply pipe has a Manning coefficient of 0.009. The smooth surface and non-adhesive characteristics of the PE water supply pipe ensure that the pipe has a higher transmission capacity than traditional pipes, and also reduces the agricultural irrigation polyethylene transmission. The pressure loss of water pipes and the energy consumption of water delivery.
9. Easy to carry
PE water supply pipes are lighter than concrete pipes, galvanized pipes, and steel pipes. It is easy to handle and install and has lower manpower and equipment requirements, which means that the installation cost of polyethylene pipes is greatly reduced.
10. Various construction methods
PE water supply pipeline has a variety of construction technologies. In addition to traditional excavation methods, it can also use a variety of new non-excavation technologies such as pipe jacking, directional drilling, lining pipes, and split pipes. Some sites that do not allow excavation are the only option!
The main raw material of the PVC-U pipeline series is PVC resin, with appropriate stabilizers, lubricants, fillers, and toners added. Rapid extrusion or injection molding Compared with traditional pipes, various all-plastic products have the advantages of a lightweight, corrosion resistance, low water resistance, energy-saving, quick installation, and low cost.
PVC-U drainage pipe is a series of drainage pipe products with mature technology, which has been widely used at home and abroad. The product has the advantages of long life and corrosion resistance than cast iron pipes can’t match; it is lighter in construction, easy to handle, and easy to connect; it is widely used in civil construction drainage, chemical drainage, rainwater, and other fields.
PVC-U drainage pipe is a kind of plastic pipe with the largest consumption in water supply and drainage projects. The installation of drainage pipes generally depends on the slope of the pipeline to achieve the flow effect. Since the inner wall of the PVC-U drainage pipe is very smooth, its roughness coefficient is 0.008~0.009, so under the same inner diameter.
The flow rate of PVC drainage pipes is much greater than that of metal pipes, and the long-term use of the pipe will not adhere to scale, so the flow rate will not be reduced. In addition, the acid, alkali, and corrosion resistance characteristics of PVC drainage pipes are added. It is one of the most practical pipes for sewer engineering pipelines.
Features of PVC-U drainage pipe
1. Strong corrosion resistance, not affected by corrosive soil and various drinking water: 2. The inner wall is smooth, and the friction resistance is smaller than that of conventional materials; 3. Pipes and fittings will not rust, so there will be no changes in corrosion and shrinkage inside: 4. The exterior wall of the building will not be polluted due to the rest of the pipeline, ensuring that the value of the building will not be damaged: 5. There are many styles and completeness of pipe fittings, which can be suitable for various design and installation requirements; 6. Easy to install, no need for regular maintenance; 7 The weight is one-fifth to one-sixth of the cast iron pipe, easy to transport and operate: 8. Adopt glue bonding, simple, fast, economical, and efficient; 9. Tasteless, odorless, non-toxic; 10. Cheaper than conventional materials; 11.The life span can reach more than 50 years under normal use conditions!
Pipeline socket connection procedure operation
1.Wipe clean the pipe sockets and pipe fitting sockets before bonding and connecting. 2.Measure the depth of the socket and mark the pipe port. 3.Apply adhesive, first coat the socket and then the socket, the coating is even and appropriate. 4.Align the direction, insert into the marking part at a time, and rotate 1/4 turn. 5.Wipe off the remaining adhesive on the socket. 6.Let the bonded pipe standstill until the joint is cured.
Adhesive safe use specification
1. Adhesives and detergents should be used as soon as they are opened, and non-operators are not allowed to use them. 2. There should be no open flame at the glue point and good ventilation. 3. It is not suitable for construction below -10℃, and the bonding points should not be baked with fire. 4. Construction personnel should be equipped with gloves. When the adhesive gets into the eyes, rinse immediately with plenty of water and send to the hospital for treatment.
Application field
The drainage network of the building. Construction of sewage pipe network. The pipe network is used for the piping system of the water treatment plant. Irrigation pipe network, normal industrial drainage.
Pipes and fittings made of PVC-U have many advantages. They are a safe choice for drinking water transportation, light and easy to operate and at a reasonable price. Technical characteristics include high mechanical properties, high durability, high chemical resistance, and resistance to ultraviolet radiation. In addition, PVC-U pipes have good environmental protection characteristics and are recyclable.
UPVC industrial pipe has the characteristics of corrosion resistance, impact resistance, non-deformation, smooth inner wall, non-scaling, good heat insulation, non-conductive, convenient bonding, and long service life. So, what are the reasons for brittle failure when using this product? Let’s get to know it together.
1. Reason introduction:
1. Impact of air hammer: UPVC fails to discharge the air in the pipe or improper setting of the exhaust valve. When there is gas in the pipeline, it is easy to generate air pockets in the pipeline. Although the airbags in the pipeline do not directly cause water hammer, they can cause damage through water hammer. Under normal circumstances, the water flow in the pipeline can be approximately regarded as a constant flow. 2. The impact of scratches: During installation and transportation, the surface of the UPVC industrial pipe is damaged by scratches and bumps. According to the crack theory of brittle failure, these scratches will concentrate the stress on the top part of the scratch, which is much higher than the average stress of the pipe. When the stress reaches and exceeds a certain critical value, the crack will grow. Because UPVC industrial pipe is a brittle material, cracks expand rapidly, leading to brittle failure.
2. Matters needing attention:
1. The pipes of upvc industrial pipes should be concealed on the ground and positioned according to the design drawings. If there are any changes in site construction, graphic records should be provided. 2. Indoor exposed pipes should be carried out after the civil engineering powder is completed. Before installation, holes or casings should be embedded correctly in conjunction with civil engineering. 3. When penetrating through walls, steel casing pipes should be installed in line with civil construction. When the cold water pipe passes through the wall, a hole can be reserved, and the size of the hole is 50 mm larger than the outer diameter of the pipe. The above introduction is about the cause of the brittle failure of the upvc industrial pipeline. According to the content of the above editor, the brittle damage of this product is mainly caused by air hammer and scratches. Please follow the above precautions when using
Upvc hydroponic pipes can be divided into Upvc perforated square pipes and Upvc perforated round pipes.
Upvc perforated pipe
We are a professional manufacturer of Upvc water piping, we researched and invented the
openable UPVC perforated square pipe
Many vegetable manufacturers are using UPVC pipes for the production of hydroponic vegetables.
PVC-U hydroponic pipe products can be accepted by the majority of users because of the following advantages:
1. Excellent corrosion resistance and chemical resistance: PVC-U hydroponic tube has excellent acid resistance, alkali resistance, and corrosion resistance. It is very suitable for growing vegetables.
2. Low fluid resistance: The wall of the PVC-U pipe is very smooth, and the fluid resistance is small. Under the same caliber, the flow rate of PVC-U pipe is larger than other pipes, and it does not adhere to scale. It will reduce green during hydroponic production. The formation of algae makes hydroponic cultivation easier.
3. Does not affect water quality: The results of the dissolution experiment proved that the PVC-U pipe does not affect the water quality and is suitable for growing hydroponic vegetables.
4. Good water tightness: PVC-U pipe joints, regardless of the use of looper sockets or TS socket joints, have good water tightness. Although the water supply pipeline has had water pressure over the years, there will be no water leakage.
We provide all the products of UPVC hydroponic pipe racks, including UPVC water piping and accessories.
Our UPVC water piping rack adopts a unique water supply structure so that the oxygen content in the nutrient solution is higher, and the plants grow better! The flow of nutrient solution can be adjusted, which is safer and more convenient.
Use hard pipes for water supply to reduce the probability of green algae produced by hose water supply. The nutrient solution is supplied by the sleeve tube, and the water tank cover can be easily opened and supplemented with the nutrient solution. The valve can adjust the water flow, and the pipe clamp and the metal bracket are fixed with screws, which are more firm. The opening is smooth, without burrs, and does not hurt your hands. It can also be used as a child’s science teaching material. It is easy to operate, easy to observe, convenient for children to participate, and improves children’s observation and hands-on skills!
We are a professional manufacturer and wholesaler of PVC water piping, and our products are exported to various countries all over the world.
