Filter Presses

Particles under pressure are uniformly deposited on the surface of the filter cloth. This initial build-up becomes the filter media. The clarified filtrate passes through the cloth and is channeled to the discharge ports. The discharge stops when the chambers fill with solids and the liquid supply pump is signaled to turn-off based on pressure differential. To remove any excess liquid remaining in the press, air blowdown is utilized. Blowdown is accomplished by introducing pressurized air into the center feed line directly where the line enters the head plate.
 
Dewatering of the solids occurs as the air forces remaining liquid toward the discharge ports at the corner of each filter plate. The plates are then separated by turning the selector switch to the “open” position, and sliding the lightweight plates apart to reveal the dried filter cakes. The removed solids are allowed to fall from the chamber recesses, through a chute and into a hopper below. The filter plates are closed by turning the selector switch to “close”, which activates a pneumatically actuated hydraulic pump to cycle on and press the plates closed. The filtration process then re-starts once the liquid supply pump is signaled to resume operation.