Schoolhill Hydraulic Engineering
Image of machined parts

What we do
Cleaning and Flushing

Performance of hydraulic equipment is very dependant on cleanliness, the Company operates a posistive pressure “Clean Room” which contains intergrated hydraulic test and flush facilities. This controlled environment is used to assemble parts where a high level of cleanlines is required.

Flushing normally takes place within the clean rooms. Fluids are constantly monitored and particle counts made, until target cleanliness levels are achieved. Schoolhill will undertake flushing to NAS1638 class level 4.

It must be noted that cleanliness begins with design, not cleaning or flushing - in order to maintain cleanliness in operation, the design must be capable of sustaining the desired cleanliness level. For example the selection of correct materials for sliding contact and bearing loads is essential. Steel to steel moving parts are not acceptable - this is of paramount importance at Schoolhill but is often overlooked by other manufacturers.

Parts must be thoroughly deragged and cleaned prior to their assembly and documented procedures are used to control the cleaning and preparation of critical components. Schoolhill have ultrasonic bath cleaning facilities, and this type of cleaning, is essential for the longevity of hydraulic cylinders and valves.


Schoolhill Engineeering, 4 Greenbank Place, Tullos, Aberdeen AB12 3RJ
Tel: +44 1224 871086 Fax: +44 1224 897135