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Gravity Sand Filter and Strainer

Valve & Allied

Valve & Allied has over 30 years of experience in supplying low cost, minimal maintenance and highly reliable automatic backwashing screen filters, autonomous sand filters and associated products. We serve clients worldwide.

Valve & Allied can supply individual units and/or design, supply, install and commission complete turnkey liquid filtration systems for industrial, commercial and municipal clients worldwide. 



The Kleerflo water filter/strainer is a self-cleaning water filter for use in a broad range of applications including, but not limited to, cooling towers, heat exchangers, refrigeration systems, wire drawing, and mineral processing. The Kleerflo is light and compact and can be installed in any orientation and is thus particularly suitable for retrofitting in established plants.

The Kleerflo's uniqueness lies in its uncomplicated design and few moving parts that not only makes it virtually maintenance free but also allows for an upgrading in design to accommodate a wide range of specific applications. It can withstand high pressures and will not jam if unusually large solids or unexpected surges in dirt loads are encountered.



The gravity filter was developed for the filtration of water that is not suited to the use of conventional screen or sand filters. Its operation makes it very suitable for the filtration of raw water containing large quantities of organic or fibrous material.



The self cleaning valveless autonomous gravity sand filter consists of a 3-compartment vertical steel tank and operates entirely without any outside energy supply, water is purified solely through the process of sand filtration. 

Backwashing occurs on the loss-of-head principle and eliminates the human error factor - all operations, including backwashing are determined and controlled by the filter itself.



The Girosand is a continuously operating sand filter. Availability is maximised by eliminating the need to take the unit out of service for backwashing, the sand being cleaned continuously by means of a simple washing system.

There are no storage tanks, pumps or automatic valves; operation is therefore straightforward and reliable. The filter has no moving parts. The GiroSand delivers filtrate of a uniformly high quality and is designed to purify highly contaminated waters.



Sandkleer filters are pressurised units, designed to remove fine suspended solids from drinking, process, cooling and irrigation water. 

They are available in a wide range of sizes and configurations to cope with specific conditions and flow rates of up to 1500 m³/hr. 

A unique control system allows for automatic backwashing. The backwashing cycle can be initiated by pressure differential, by a timer, an external command or manually.



A complete dosing, settling and filtration plant is designed to suit the specific conditions of the application. This plant is designed to be very low maintenance, compact in size with a high level of availability. 

These Plants are especially suited for rural water treatment applications.



Valve & Allied manufactures reliable and compact Lamellae Plate Settling Systems.



A range of conical bottom clarifiers with either concrete shell with steel internals, or fully steel construction, depending on diameter, are available in sizes to compliment our range of AGF autonomous gravity sand filters.

Valve & Allied supplies the following products:
  • Automatic Backflush Strainer
  • Automatic Water Filters
  • Commercial Water Filtration System
  • Filter and Strainers
  • Filters
  • Filters: Back wash Filter
  • Filters: Backwashing Filters
  • Filters: Steel Pressure Filters
  • Filtration
  • Filtration System Design
  • Filtration Systems
  • Fully Automatic Backwashing Filters
  • Fully Automatic Backwashing Strainers
  • Fully Automatic Gravity Sand Filters
  • Gravity Filters
  • Gravity Sand Filters
  • Industrial Filter System
  • Industrial Sand Filter
  • Industrial Strainers
  • Industrial Water Filter
  • Industrial Water Filtration
  • Industrial Water Filtration Systems
  • Inline Filters
  • Inline Strainers
  • Inline Water Strainer
  • Moving Bed Sand Filters
  • Pressure Filtration
  • Pressure Filtration System
  • Pressure Sand Filters
  • Process Water Filtration
  • Sand Filters
  • Sand Filters : Automatic
  • Self Cleaning Filter
  • Self Cleaning Inline Filters
  • Self Cleaning Screen Filters
  • Self Cleaning Valveless Autonomous Gravity Sand Filters
  • Self Cleaning Water Filters
  • Water Filter System
  • Water Filters
  • Water Filtration Systems


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