Oil/Air Cooler ■ Maintenance friendly design ■ Broad performance range ■ Rugged cooling matrix Buhler Technologies GmbH Internet: www.buehler-technologies.com e-mail: [email protected]

There are basically two main concepts in the development of fluid power systems. One is to design systems without using a cooler, and if operational conditions show that the system needs a cooler, install it later at additional costs. The other concept recognises that a system originally designed with an integrated cooler is more compact, needs less installation space and is more reliable due to the stabilized temperature of the fluid. Today's requirements for an oil/air cooler demand for an effective and compact design with low noise emission and very easy maintenance. The development of the...

Sizing the right Cooler The determination of a cooler follows two steps: determination of cooler size determination of expected pressure loss specific cooling performance (see performance curves) PS| specific heat capacity of oil (approx. 2.0 kJ / kgK) Calculation Example: Oil flow rate (Q) 80 l/min 3. Required specific performance: Pressure loss curves determined with an 4. Using the graph, select a cooler at 80 l/min with: BLK 2.2, or alternatively BLK 3.4, this cooler is larger but has the lower noise emission Temperature/viscosity table Correction factor k(visc) Attention: If the coolers...

General Data Material/surface protection Cooling matrix motor console aluminium, varnished mild steel powder coated Oil/water emulsion HFA/HFB according to CETOP RP 77 H Water glycol HFC according to CETOP RF 77 H Phosphate ester HFD-R according to CETOP RP 77 H Operating pressure Operating temperature Electrical motors Insulation class Protection class higher viscosities upon Part no. Type Motor Full load current Motor Weight Volume Noise emission power output at 400V poles (kg) (I) db(A)* The part numbers for BLK 2 -5 are 50/60 Hz versions, for BLK 6-10 the 50 Hz versions only, the 60 Hz versions...

some types have consoles to support motor connection G 14 for temperature switch connection M14 x1,5 for temperature switch BLK 1 cooler type

Function Schemes Flow direction optional from left to right or vice versa. Flow direction optional from high left to low right or vice versa. Other ports must be plugged. Internal by-pass IB/ITB (BLK 3-9) With by-pass valve Oil inlet and outlet are always at the same side. Ports on opposite side must be plugged. Oil inlet is always from low port, outlet on opposite side. Other ports must be plugged. With temperature operated by-pass valve With temperature switch

The cooler must be located in such a way that the air flowing through the matrix has free flow on entry and exit. The distance between air intake or air outlet to the nearest surrounding obstacle should be a minimum of half the height of the matrix (dimension B). Free air flow must be provided. If the cooler is to be sited near to working personnel the effect of hot draught and noise emissions must be taken into If the ambient air is carrying impurities or other particulates the cooling matrix could become clogged thus reducing the cooling efficiency. If this situation is unavoidable we recommend...