[Equipment Overview]

The steel gravity type valve free filter series products are widely used in surface water purification, groundwater iron and manganese removal, circulating water bypass filtration, suspended impurities removal from production wastewater, subsequent filtration of organic wastewater after biochemical treatment and secondary sedimentation tank treatment, and indoor swimming pool water filtration. It is an ideal water treatment equipment.

Gravity type valve free filter/filter tank is a fast filter tank that does not require valves. During operation, the water level of the effluent remains constant, while the water level of the influent continuously rises inside the suction pipe as the filter layer head loss valve increases. When the water level rises to the top of the siphon pipe and forms a siphon, automatic backwashing of the filter layer begins, flushing the wastewater out of the tank along the siphon pipe.

The inlet, outlet, flushing, and drainage of gravity type valve free filters/filter tanks do not require valves. They operate automatically by hydraulic action, with low operating costs, convenient management, safety automation, and integrated equipment. The inlet water tank, filter, backwash water tank, and other components are assembled together in a compact structure. Users only need to make the equipment foundation and connect the inlet and outlet pipes as required to put it into operation. At the same time, the filter series products are all equipped with a top cover, providing good hygiene and protection conditions. They can be set up outdoors and have a smaller weight compared to reinforced concrete filters. They use asphalt sand flexible foundations.

[Working Principle]

The raw water is sent into the filter through the inlet pipe and filtered from top to bottom through the filter layer. The clean water is then injected into the storage tank through the connecting pipe for storage. After the tank is filled, the water enters the clean water tank through the outlet pipe. The continuous interception of suspended solids by the filter layer leads to a gradual increase in the resistance of the filter layer, thereby causing the water level inside the siphon tube to continuously rise. When the water level reaches the mouth of the siphon auxiliary pipe, water falls from the pipe and takes away the air in the siphon downcomer through the suction pipe. When the vacuum degree reaches a certain value, siphon action occurs. At this point, the water in the pipe flows from bottom to top through the filter layer, backwashing the filter material. When the water level of the flushing water tank drops to the siphon breaking pipe, air enters the siphon pipe, breaking the siphon effect. The backwashing of the filter is completed and the next cycle of work is entered. Therefore, gravity type valve free filters do not need to be equipped with backwash pumps and backwash water towers like other filters.

[Equipment Features]

1. Gravity type valve free filter is the earliest valve free filtration device in China that cleverly utilizes the siphon principle to achieve automatic operation without valves and control instruments. It can automatically flush and has the advantages of no manual operation, low energy consumption, low operating costs, safety and reliability, and convenient management compared to other filtration equipment.

2. The gravity type valve free filter is assembled from a water distribution tank, filter, U-shaped inlet pipe, drainage tank, etc. It has a compact structure, and users only need to prepare the equipment foundation and connect the inlet and outlet pipes according to requirements before it can be put into operation.

3. Gravity type valve free filters are made of carbon steel (or according to user requirements), with strict anti-corrosion, high processing accuracy, and easy installation.

4. No water pressure, electricity, or compressed air is required to provide power, and all working processes are controlled by the filter itself.

5. There is a forced flushing system in the valve free filter tank. If the loss of water head in the filter tank has not reached the allowable value and needs to be flushed in advance for some reason, manual forced flushing can be carried out.

6. The valve free filter is maintenance free and has no wear and tear.

[Equipment Usage]

Valveless filter is mainly suitable for the purification treatment of various surface water. It can treat water with a turbidity of less than 3000 milliliters per liter and supply it to domestic or industrial water. It can also purify industrial wastewater such as cooling water, mine water, and circulating water before reuse, improving the reuse rate of water.

1. Used for side filtration treatment of circulating cooling water in industries such as petroleum, chemical, pharmaceutical, metallurgy, power plants, light industry, textile, printing and dyeing, and dyeing and finishing;

2. Used for surface water purification and underground water iron and manganese removal;

3. Used for filtration treatment in urban and township water plants;

4. Pre treatment for softening and desalination treatment;

5. Used for purification treatment of swimming pools and fountain water features;

6. Used for removing suspended solids from production wastewater, biochemical treatment of organic wastewater, and subsequent filtration after secondary sedimentation tank treatment;

[Scope of Application]

1. When using a gravity type valve free filter for filtration treatment in a water plant, the suspended solids in the inlet water should be less than 15mg/l, and the suspended solids in the outlet water should be less than 3mg/l;

2. When gravity type valve free filters are used for circulating cooling water side filtration treatment, the suspended solids in the inlet water are generally 15-30mg/l, and the suspended solids in the outlet water are generally less than 5mg/l;

3. Gravity type valve free filters are used for "adding coagulants for treatment", with inlet suspended solids at 50-100mg/l and outlet suspended solids generally less than 5mg/l.

[Technical Parameters]

1. Average filtration rate: 10 meters per hour

2. Average backwash intensity: 15 liters per square meter per second

3. Backwash duration: 5 minutes

4. End of term head loss value: 1.70 meters

5. Backwash expansion height: 800 × 40% plus 100mm safety height

6. Filter layer height: 800mm Support layer thickness 200mm

7. Inlet turbidity: not greater than 15 degrees (used for surface water purification)

8. Turbidity of effluent: not greater than 3 degrees (used for surface water purification)

[Equipment Usage]

Valveless filter is mainly suitable for the purification treatment of various surface water. It can treat water with a turbidity of less than 3000 milliliters per liter and supply it to domestic or industrial water. It can also purify industrial wastewater such as cooling water, mine water, and circulating water before reuse, improving the reuse rate of water.

1. Used for side filtration treatment of circulating cooling water in industries such as petroleum, chemical, pharmaceutical, metallurgy, power plants, light industry, textile, printing and dyeing, and dyeing and finishing;

2. Used for surface water purification and underground water iron and manganese removal;

3. Used for filtration treatment in urban and township water plants;

4. Pre treatment for softening and desalination treatment;

5. Used for purification treatment of swimming pools and fountain water features;

6. Used for removing suspended solids from production wastewater, biochemical treatment of organic wastewater, and subsequent filtration after secondary sedimentation tank treatment;