Hand pumps are the most common power source within the area of 'High Pressure Hydraulic Tools'.
For this reason, our hand pumps have been carefully designed and equipped with many details
which make the pumps very versatile and handy in every-day applications.
Relief Valve / Hand Wheel
The fine adjustment relief valve in connection with the large hand wheel allows millimetre increments lifting and lowering even of the highest loads. The fact that sometimes hundreds of tons are controled by this handwheel, underlines the importance of detail.
Sturdy 'All Metal' design
The robust pump head and the absence of anyplastic parts result in long service life and easy maintenance over many years. Plastic reservoirs filled with oil can represent a fire danger in connection with welding or similar work.
Carrying Handle
Hand pumps in general are often carried around. All Yale hand pumps are equipped with a convenient carrying handle.
Pressure Relief Valves
All Yale hand pumps are equipped with two pressure relief valves. They are easily adjustable from outside in those cases where pumps must be re-adjusted or a lower operating pressure should not be exceeded.
Reservoir Ventilation
All hand pumps are equipped with a reservoir ventilation plug. This ensures perfect suction of hydraulic oil and allows you the total oil capacity of the reservoir.
Two Stage Output
All Yale hand pumps have two-stage design (except HPS-1/0.7). This allows an increased speed and efficient working during unloaded conditions of the hydraulic cylinder. The switch-over from the low pressure to the high pressure stage is done automatically.
Delivered 'Ready to Use'
All yale hand pumps are supplied 'ready to use' uincluding hydraulic oil.
Easy Maintenance Design
There is no need to disassemble the Yale hand pumps in case of service work. All parts like suction and pressure valves, seals, packings, etc., are accessible from the outside.
All Hand Pumps have the Same Design
The same design (build-up) for all Yale hand pumps with the exception of the reservoirs allows the interchaneability of all components. Therefore, spare part stocks can be kept to an absolute minimum. Only one spare part kit is necessary to sevice all hand pumps.
Excellent Suction Properties
Yae hand pumps suck and displace 100% of their volume per stroke. This results both in a high efficiency as well as a rapid cylinder movement.
Interchangeability
All Yale hydraulic cylinders, hand pumps and other components are fully interchangeable and can be combined with all other 700 bar hydraulic lines. All components have the standard oil port and same coupler parts.
Additional 'Return Oil Port'
All Yale hand pumps are equipped with a return port to the reservoir. This detail is very adventageous as many hand pumps are integrated in more complex hydraulic circuits.
Base Frame
On request you can get base frames for the most common hand pumps. These base frames add to the stability and protection of the hand pumps. In particular, when used in the field or on a construction site.
Hand Pumps for Double-Acting Cylinders
(with relief vale and 4/2-way directional valve in combination)
Unlike conventional pumps, all Yale hand pumps of the type HPH (with 4/2-way directinoal valve for double acting cylinders) include a precision relief valve in addition to the directional control valve. Manual directional control valves switch over abruptly, thus causing undesired pressure surges in the system under load. The additional relief valve in all HPH-hand pumps allows a precise lowering of the load without any pressure shocks.
A further advantage of this design is that the pressure gauge shows the pressure as pushing and as pulling force.
