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The significance of cast iron flap gates and anti-rust and anti-corrosion measures Flap gates are commonly used in sluice gates and are essential accessories for sluice gate operation. Sluice gates are now widely used in projects such as chemical, petroleum, and water conservancy hubs, and are important components of hydraulic structures. Therefore, the use of flap gates is particularly important. In the production of flap gates, the treatment of anti-rust technology is relatively important. The spraying materials for the anti-rust and anti-oxidation film on the surface of the flap gate should be strictly controlled. This is the first line of defense against rusting of the flap gate. Attention should be paid to the anti-rust maintenance of flap gates. If a flap gate is not used for a long time, it should be stored in a dry environment, and regular cleaning and maintenance of dirt should be carried out to avoid rusting caused by moisture. For flap gates in use, when they are out of service, dirt can be wiped off, lubricating oil can be applied, and they should be kept dry before being put back into use. The garbage inside the flap gate should be cleaned up in time to ensure the flexibility between components. Hinge structure design of cast iron flap gates: The upper part of the large flap gate is connected to the body of the rapid multi-leaf flap gate through two hinges. In the past, the hinges of flap gate design were cylindrical hinges. This structure has the problem of poor water sealing. That is, when the water level difference of the flap gate for water retention is small, the water pressure acting on the flap gate is not enough to overcome the reaction force of the compression of the top water seal of the flap gate, which may result in poor contact between the bottom water seal and the water seal seat surface. If good contact between the bottom water seal and the water seal seat is to be ensured, when the water level difference of the flap gate for water retention is large, the sealing effect of the top water seal is not good due to no compression. Therefore, in the design of the flap gate hinge, the hinge structure was optimized, and a horizontal oblong hole and a cylindrical shaft structure were adopted, ensuring that the water seals around the flap gate can be in uniform contact with the water seal seat surface under any water level difference, so that the water sealing is always in a good state. At the same time, the water sealing surface is designed to be inclined, and the angle between the inclined surface and the vertical surface is 5°, so that the flap gate can be in close contact with the water seal by its own weight. Overview: Pump station drainage - steel flap gates belong to the check valve products. The door panel is opened by the medium pressure, and the closing and sealing are realized by the self-weight of the door panel. This product is independently developed by Hebei Yangyu Hydraulic Machinery Co., Ltd. on the basis of absorbing the technology of the swing check valve of the American AS company. This product complies with the company's technical standard Q/TF - B2771; it is tested according to the requirements of GB/T13927; the nominal pressure (PN) of the equipment is 0.25 - 1.6Mpa; the nominal diameter (DN) is 200 - 2000mm. Installation and use of pump station drainage - steel flap gates 1. The flap gate can be installed by flange connection, pre - embedded, or permanently inserted. 2. When using a weighted flap gate, if the forward hydraulic force is insufficient to open the door leaf, counterweight devices of different weights can be set according to the installation position requirements. 3. During the use of the floating box flap gate, the specific gravity of the door leaf can be changed by injecting or discharging water into or from the sealed cavity of the door leaf to achieve the best opening effect. 4. When multiple flap gates are installed, if installation in sections is required due to lifting conditions, attention should be paid to marking. Since the connection between the door seat and the door leaf of each flap gate is a matched pair, they cannot be interchanged. 5. The angle a between the installation axis of the wall - penetrating pipe and the horizontal direction should be greater than or equal to zero (see Figure 4). 6. After the flap gate is installed, it is normal that there is a gap of about 3mm between the door seat and the door leaf. When the door leaf bears a certain reverse pressure, the gap will decrease or even disappear. Connection dimensions of floating box flap gates The flap gates currently produced by our factory are mainly suitable for circular water outlets with one - way water flow. The connection dimensions are shown in Table 1. If users need flap gates suitable for square water outlets or the connection dimensions do not match those in Table 1, they can be customized from our factory.
Table 1. Table of common flap gate connection dimensions: Precautions for the installation of floating box flap gates. 1. Before installing the flap gate, first check whether the bolts at each connection part are loose due to transportation and handling. If they are loose, tighten them. 2. Check whether the water stop surfaces on the connection between the main vertical frame and the horizontal frame are misaligned. If there is misalignment, loosen the connection bolts and adjust the water stop surfaces to be on the same plane. 3. When installing the flap gate, it should be installed as a whole. It is prohibited to install the gate frame and the gate plate separately to prevent the gate frame from deforming. 4. Before the second-phase pouring, hoist the whole gate into place, find the correct front-back and left-right positions, and then adjust the bolts and weld them firmly with the engineering reinforcement. 5. Before the flap gate leaves the factory, in order to make the gate plate and the gate frame fit more tightly and reduce the gap after installation, for gates over 2 meters, pressure plate clamping irons are installed on the upper and lower horizontal frames, and jackscrews are added to the inclined irons of the vertical frame. Note that after adjusting the gap, remove the jackscrews on the clamping irons and the inclined irons to enable the gate to open and close. 6. When pouring concrete, the mortar flowing into the gaps between the gate plate, the gate frame, the inclined irons and the baffle plates should be removed to prevent the mortar from solidifying and affecting the opening and closing. VII. Common faults and troubleshooting methods of floating box flap gates. Common faults, Cause analysis, Troubleshooting methods. I. The opening angle of the flap gate leaf is not large during system operation. 1. Whether the flap gate bolt is worn or rusted. 1. Replace the flap gate bolt. 2. Whether the floating box type flap gate leaf has too much water storage and a large specific gravity. 2. Drain water to reduce weight. 3. Whether the counterweight of the counterweight type flap gate is too small. 3. Increase the counterweight. 4. Whether the empty box of the floating box type flap gate leaf leaks. 4. Weld the pressure cloth of the gate leaf. 5. Whether the hinge of the flap gate leaf and the gate seat is damaged or deformed. 5. Replace the flap gate. II. The flap gate leaks after closing. 1. Whether the sealing rubber triangular belt is damaged. 1. Replace the rubber belt. 2. Whether the upper flange of the gate seat is deformed. 2. Replace the gate seat. 3. Whether the sealing end face of the gate leaf is deformed. 3. Replace the gate leaf. 4. Whether the cylinder body of the gate seat is rusted through. 4. Replace the gate seat. 5. Whether the gate leaf is rusted through. 5. Replace the gate leaf. III. The gate leaf cannot return after opening. 1. The opening angle is too large and the limit block falls off. 1. Weld the limit block. 2. Whether the flap gate bolt is rusted. 2. Replace the flap gate bolt. 3. Whether the hinge of the gate leaf and the gate seat is deformed. 3. Replace the flap gate. 4. The counterweight of the counterweight type flap gate is too large. 4. Reduce the weight and unload. Flap gates are divided into fiberglass flap gates, composite material flap gates, cast iron flap gates, flap gate valves, floating box flap gates, and circular flap gates. Flap gate: It is mainly installed at the end of the drainage pipeline and is a check valve with the function of preventing backflow of external water. Traditionally, the material of the flap gate is various metal products, and now it has developed into a variety of composite materials. The flap gate is mainly composed of four parts: the valve seat, the valve plate, the sealing ring, and the hinge. The shapes are divided into circular and square. Cast iron flap gates are used for pipelines or water outlets with one-way water flow. They have a simple structure, reliable operation, and do not require manual operation. They are equipped with standard flanges and can be connected to various pipelines. The pressure-bearing capacity in the reverse water direction is ≤0.1Mpa. This product can be divided into circular flap gates (YPM) and square flap gates (FPM). The bolts or expansion screws of the cast iron flap gate are made of stainless steel or carbon steel with anti-corrosion treatment, and the sealing parts are made of rubber or rubber gaskets. The nominal pressure of the cast iron flap gate is 0.1MPa - 1.0MPa, and the applicable temperature is ≤50℃. The allowable deviation between the center of the cast iron flap gate and the center of the flow channel should not be greater than 3.0 mm; there should be an installation space of 400 mm around the flap gate, and a 1:5 slope should be made below the outlet of the flap gate. The cast iron flap gate can be installed by flange connection or concrete pouring. The cast iron flap gate is suitable for the water conservancy system, municipal sewage, urban flood control and drainage, sewage treatment plants, water supply plants, etc. Main performance parameters of the cast iron flap gate: Nominal pressure: 0.1MPa. Applicable medium: water, river water, sewage, sea water. Applicable temperature: ≤50℃. Material of main parts: gray cast iron. Common faults and troubleshooting methods of the cast iron flap gate (Common faults, Cause analysis, Troubleshooting methods). Fault I. The opening angle of the flap gate leaf is not large during system operation: Possible reasons. 1. Whether the flap gate bolt is worn or rusted -------- Solution: Replace the flap gate bolt. 2. Whether the floating box type flap gate leaf has too much water storage and a large specific gravity ----------- Solution: Drain water to reduce weight. 3. Whether the counterweight of the counterweight type flap gate is too small -------------- Solution: Increase the counterweight. 4. Whether the empty box of the floating box type flap gate leaf leaks ------------ Solution: Weld the pressure cloth of the gate leaf. 5. Whether the hinge of the flap gate leaf and the gate seat is damaged or deformed----------- Solution: Replace the flap gate. Performance requirements and functions of square steel flap gates. The manufacturers of square steel flap gates point out that square steel flap gates are essential devices for major water conservancy and hydropower projects, used to control the lifting of various cast iron gates and steel gates to achieve opening and closing.
Flap gate performance: Nominal pressure: 0.1MPa - 1.0MPa. Applicable medium: water, river water, river water, sea water, domestic and industrial sewage. Applicable temperature: ≤50℃. Applicable scope: Suitable for the system, municipal sewage, urban flood control and drainage, sewage treatment plants, water supply plants, etc. Product specifications and categories: The specifications of flap gates are divided into circular flap gates and square flap gates, which can be designed and produced according to the size and shape of the water outlet; the categories of flap gates can be respectively hollow floating plate type flap gates and flat plate type flap gates. Flap gate installation: The flap gate can be installed in the following ways: flange connection, concrete pouring. The allowable deviation between the center of the flap gate and the center of the flow channel should not be greater than 3.0 mm. There should be an installation space of 400 mm around the flap gate, and a 1:5 slope should be made below the outlet of the flap gate. The structure of the composite material flap gate is composed of the flap gate seat, the flap gate cover, and the connecting shaft. The flap gate seat adopts a double-flange structure. The lower flange plays the role of connecting and fixing the flap gate, and the upper flange plays the role of sealing, water stop and drainage. The fixed flange of the circular flap gate adopts the standard to be compatible with the steel flanges sold in the market, and the fixed flange of the rectangular flap gate is a non-standard flange. The inclination angle of the flap gate seat is generally 75 degrees. For large flap gates, the inclination angle can be increased, generally 80 degrees. The purpose is to enable the flap gate cover to open better. Flap gate seat of the composite material flap gate: The other side flange of the flap gate seat of the composite material flap gate is a sealing and water-stop flange. There is a U-shaped groove on its surface, and a Y-shaped sealing rubber strip is embedded in it. An imported * adhesive is applied between the sealing rubber strip and the fiberglass, and the bonding is firm. It has excellent water resistance and will not fall off due to long-term immersion and frequent opening. The sealing rubber strip is made of imported rubber raw materials and is vulcanized and formed in a vulcanizing bed. Its flexibility and sealing performance have been explored and practiced by our factory for many years. After continuous improvement, its sealing effect is very ideal. Its flexibility can reduce the impact force of the flap gate cover on the flap gate seat due to instantaneous backwater, protecting the flap gate seat and the flap gate cover. Therefore, this rubber strip plays a dual role of sealing and buffering. For example, when the water pump stops, the water outlet of the flap gate suddenly lacks water and closes instantaneously. Since the weight of the flap gate cover is relatively light, most of the external force has been eliminated invisibly under the reduction of the rubber strip, so that the flap gate cover closes tightly without being damaged. The flap gate cover is a hollow floating box type, with a circular arch shape. There is a water injection hole on the upper and lower surfaces respectively. Normally, there is no need to inject water into the floating box. When the pressure difference between the inside and outside of the flap gate is small, the flap gate cover cannot close well due to water buoyancy. At this time, water must be injected into the floating box to increase the weight of the flap gate cover, so as to close the flap gate cover. For large or extra-large flap gates, since the amount of water to be injected is large, the water injection port can be connected with a centrifugal pump, and automatic conversion valves are installed at both ends of the pump, so that remote automatic control can be realized, which can reduce unnecessary manpower and other safety factors.
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