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Help CenterSteel Flap Gate From Wuhan, Hubei. Round Gate for Water Stop and Backflow Prevention
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Supplier of 500 flap gates. Cast iron flap gates, prices of 400 cast iron flap gates. Screw hoists use worm gears, worms, or gears to drive the screw and pull the gate up and down. A gate hoist that uses a transmission mechanism to drive the screw and pull the gate up and down. Installation steps of the screw hoist: 1. When installing the screw hoist, make sure to keep the base foundation layout plane horizontal at 180o; the contact area between the hoist base and the foundation layout plane should reach ***; the screw axis should be perpendicular to the horizontal plane of the crossbeam on the sluice platform; it should be aligned and perpendicular to the lifting lug hole of the sluice gate to avoid the screw tilting and causing local stress and damage to the machine parts. Stainless steel flap gates, steel flap gates, PM-cast iron flap gates, steel floating box flap gates, sleeve-type flap gates, fiberglass flap gates, composite material flap gates are mainly installed at the end of the drainage pipeline. They are a kind of one-way valve at the outlet of the drainage pipe by the river. When the river tide level is higher than the outlet of the water pipe and the pressure is greater than the pressure inside the pipe, the flap gate panel automatically closes to prevent the river tide from flowing back into the drainage pipeline. Currently, flap gates are divided into models such as suspension type, single/double door, and energy-saving type. They are check valves with the function of preventing external water from flowing back.
[Main features of the flap gate]
1. Simple structure and good sealing performance;
2. Lightweight structure and small opening and closing resistance;
3. Large buoyancy, large opening angle, can effectively reduce water resistance and save energy;
4. Lightweight and small rotational inertia;
5. Good strength and stiffness;
6. Hydraulically opened and automatically closed, saving human and electrical energy resources;
7. Flange connection, easy to install;
8. The gate leaf is a sealed cavity structure with a relatively small specific gravity;
9. No need to hang and configure counterweights.
[Projects where the flap gate is used]
Fiberglass flap gates are widely used in water conservancy projects such as channels, pipelines, irrigation, canals, ponds, sewage treatment plants, and metallurgical plants. They open and close naturally through the pressure difference inside and outside the flap gate and are in a free-fall state. The main functions are water supply and drainage, interception, overflow, and non-return.
[Test requirements for the flap gate]
1. Strength test: Before leaving the factory, the fiberglass flap gate undergoes a strength test in the factory. The test pressure is 1.5 times the rated pressure, and the pressure is maintained for 5 minutes. It is considered qualified if there is no leakage and no structural damage.
2. Sealing test: Before leaving the factory, the fiberglass flap gate undergoes a sealing performance test in the factory. The test pressure is 1.1 times the rated pressure, and the pressure is maintained for 5 minutes. It is considered qualified if there is no leakage phenomenon.
3. Painting: Before painting, the outer surface of the fiberglass flap gate is derusted according to the GB8923 standard to remove oil stains and the adhesion layer, and then it is all painted with anti-rust primer and topcoat to prevent the outer surface from rusting after contact with air.
4. Execution standards: Adhesion → GB1720 standard, toughness → GB1731I standard, impact strength and hardness → GB1730 standard.
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