Hand Pumps 700 bar

Build-up and description of the Yale hand pumps

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 by millimetre increments lifting and lowering even by the highest loads. The fact that sometimes hundreds of tons are controlled by the hand wheel, underlines the importance of this detail.

Sturdy “all-metal-design”

The robust pump head and the absence of any plastic 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 wih a convenient carrying handle.

Pressure relief valve

All Yale hand pumps are equipped with two pressure relief valves. They are easily adjustable from ouside 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 to use 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” incl. hydraulic oil.

“Easy-maintenance-design”

There is no need to disassamble 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 interchangeability of all the components. Therefore spare part stocks can be kept to an absolute minimum. Only one spare part kit is necessary to service all hand pumps.

Excellent suction properties

Yale 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 advantageous 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.

Pressure gauges

Appropriate pressure gauges with the corresponding adaptors are available.

Hand pumps for double-acting cylinders with relief valve and 4/2-way directional valve (in combination)

Unlike conventional pumps, all Yale hand pumps of the type HPH (with 4/2-way directional 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.

Further advantage of this design:

The pressure gauge shows the pressure as pushing and as pulling force.

Hand pump type: HPH...
with integrated pressure gauge GGY - 631 and gauge adaptor set GA - 704