Series TH and FH use closed impellers in order to minimize power consumption and to optimize hydraulic pump efficiencies.

In addition, the TH series offers high pressures at short immersion depths.

Inline pumps of the series FH can be used as boosting pumps if provided with positive inlet pressure. This inlet pressure can be provided by the central coolant supply or a feed pump. In such a setup, pumps of the series FH can raise the incoming pressure by up to 375 PSI (26 bar).

For alternating machining using internally and externally cooled tools, these models are available with Y/YY-connfigured pole-changing motor (Dahlander) for optional changeover to half speed operation.

A frequency alternator can be supplied for special applications or for matching the pump characteristic to a specific duty point.

See page "Control/Regulation" in the Technical Information section of this catalog for further information.

Applying TH/FH pumps in grinding applications

Grinding versions TH/FH pumps (-E).
TH/FH series pumps can be supplied upon request in a special grinding version for applications with heavy loads of abrasive particles (>50 HRC).
Ordering description: e.g. TH45/540-E

In this version pumps are supplied without internal diffusor gaskets in order to prevent increased wear caused by the abrasive particles in the fluid. As a result, however, the internal losses of the pump increase and the pump curves are reduced by the following percentages (valid for water based coolants).
The delivery height of the pumps will decrease as follows (valid for water based coolants):

• TH/FH45:   18%
• TH/FH90:   14%
• TH/FH180:   8%
• TH/FH360:   5%