Pressure Filters

Contaminated coolant is collected in the dirt tank and then pumped to the sealed filter chamber above the endless nylon belt. Contaminants are collected on the belt. Clean fluid flows through the belt, and the supply pump returns clean fluid to the machine tool. As contaminants build up to form a filter cake, the differential pressure across the belt increases until it reaches a preset limit. When this occurs, incoming flow is stopped, and the filter cake is dried by compressed air. The chamber then opens, and the filter belt conveys the cake into the dirt container.

Hoffmann Automatic Pressure Filters are ideally suited for use in highly automated, machine-tool applications. These filters are opened and closed by two air cylinders, ensuring that the filter remains tightly closed, even in the event of a pressure loss.

Automatic Pressure Filter Options
Hoffmann Automatic Pressure Filter Systems are available with these options:

Automatic Pressure Filter Advantages
Advantages of the Hoffmann Automatic Pressure Filter Systems are listed below:

Hoffmann Automatic Pressure Filter Systems are the most versatile filtration systems for the metal working industry. Due to the variety of filter units, flow rates as low as 100 gpm to over 4000 gpm are possible. All automatic pressure filter systems use an endless nylon belt that eliminates the need for filter media. However, for special applications, the units may utilize disposable filter roll media or cellulose, pre-coated on the nylon belt. Applications may range from entire transfer lines, groups of machining centers or grinders, as well as block hone lines. Additional fine filtration or wedge wire pre-filtration and coolant temperature stabilization may be added to complete the system to the customer requirements.

Automatic Pressure Filters

Pressure Filters 
Hoffmann Filter offers Automatic Pressure Filters as well as Compact Pressure Filters.