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What is Hydraulic Screen(Sieve Bend Screen)?

What is Hydraulic Screen(Sieve Bend Screen)?

Hydraulic screen (also known as Sieve Bend Screen or Pressure Curved Screen) is a simple, efficient and easy-to-maintain pollution interception device that uses perforated material (wedge-shaped wire) to intercept suspended solids in liquids. It is suitable for removing solid suspended impurities from low-concentration solutions.

Commonly used materials for hydraulic screens:
The screen material of hydraulic screen (hydraulic screen) is now often made of stainless steel wedge-shaped wire mesh that is not easy to rust. The wedge-shaped wire mesh has high mechanical strength, is easy to clean dirt after filtering, is not easy to block, and has a long service life.

It is often used for industrial filtration and screening of printing and dyeing wastewater, poultry processing, petrochemical and other industrial wastewater treatment, as well as urban sewage treatment and recovery of useful solid debris.

Hydraulic screening is divided into fixed flat hydraulic screen, fixed curved hydraulic screen and hydraulic rotating screen.

Advantages of wedge wire curved hydraulic screen:

Simple and efficient
Economical (low capital expenditure)
Easy to install
High filtration efficiency

Hydraulic performance of hydraulic screen:

1. Hydraulic performance of hydraulic screen under clean water conditions
Under the same water flow rate, the local head loss of a high-mesh hydraulic screen (mesh) is greater than the local head loss of a low-mesh hydraulic screen (mesh), and the energy loss is larger. The main reason is that the pore size of the high-mesh screen filter is smaller, the water flow is greatly affected by boundary conditions, the friction and violent collision between particles increase the consumption of mechanical energy, and the flow rate of the water flow through the mesh increases as the pore size decreases.
2. Hydraulic performance of hydraulic screen under conditions of contaminants
Under the same water flow rate, the greater the sand content at the water inlet, the greater the local head loss of the system.
The fundamental cause of liquid energy loss is liquid viscosity. Due to viscosity, the liquid generates frictional resistance during the flow process, causing a loss of mechanical energy in liquid motion, which is local head loss. In a high-sand-containing flow state, the viscosity coefficient of the flow increases with the increase of the sand content, which is greater than the viscosity coefficient of clear water at the same temperature. The friction within the flow consumes more mechanical energy and increases water loss. Therefore, under the same flow rate, the local head loss of the system increases with the increase of sand content, and is higher than the local head loss of clear water.

Quality requirements:

Removal rate: The removal rate of particles greater than the filtration precision specified by the process is greater than 90%.

Under normal operating conditions, the service life of the filter unit is greater than 5 years.

Under normal operating conditions, the main body has a service life of 20 years.

Panel Frame: Painted carbon steel for freshwater applications, stainless steel for saltwater applications.

Screen mesh: all made of Wedge Wire Screen or stainless steel and other suitable materials.

 

 

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