Components of an hydraulic system
How to choose a cilynder?
It’s necessary to have some essential information to choose the correct cylinder, this information includes:
– TYPE OF CYLINDERS IN RELATION TO THEIR USE
And also some further information as:
– REQUIRED OIL VOLUME
– OPERATIONAL SPEED
In the USEFUL PAGES you may find some calculation examples.
There are three main types of cylinders:
Load return, in which the piston is retracted by the weight of the load (or any other external force). The minimum force required to retract the piston is approximately 0,2% of the rated cylinder nominal push value. These cylinders are the most economic solution for an application that does not require quick removal of the cylinder after the load has been lowered.
The cylinders of the CGG, CGR, CGS ranges belong to this group.
Spring assisted return, in which the piston is retracted by means of an internal compression or a tension spring inside the cylinder. These cylinders are proposed whenever it is necessary to remove the cylinder quickly once the load has been lowered.
The cylinders of the CMC, CMF, CMI, CML, CMP, CMT ranges belong to this group.
Oil Return, (double acting): the piston is retracted hydraulically by pumping oil into the anular chamber of the cylinder. The ideal usage of these cylinders is in production applications where a fast cycle time is required. When being used in a lifting application, the lowering of the load can be controlled by adding a pilot check valve and one-way flow distributor into the circuit. The return pressure can be set at a lower value when it is only the retracting the piston is required.
The cylinders of the COF, COG, COI, COL, COS ranges belong to this group. When it is necessary to exert a pulling force, we recommend cylinders belonging to the COD, COJ ranges.These cylinders are supplied with the required threads and connections and may also be operated at the maximum working pressure on both sides of the piston.
# # #
# # #
Pushing force in t
N = Standard
Stroke in mm
F = with base mounting holes
Cylinder, spring return with 20 t force, N version,100 mm stroke.
Load return cylinder with safety nut, 200 t force, N version, 250 mm stroke with fixing holes at the base and tilt saddle.
How to choose a pump?
– Reservoir capacity
– Cylinder extension speed
PUMP SELECTION BASED ON ITS TANK CAPACITY
After having selected the most suitable cylinder and determined the oil volume required for the stroke, it is now necessary to choose the most suitable pump based upon the required oil volume. This volume can be defined by 1.2 multiplication of the oil volume required for the selected cylinder(s). In the case of double acting cylinders the retraction oil volume shall be subtracted from the volume of oil required to extend the cylinder. It’s also important to take into account the quantity of oil needed to fill the flexible hoses which is 32 cm³ for meter length.
The following tables allows an easy choice.
The coloured zones represent the maximum utilization limits for each pump type.
PUMP SELECTION BASED ON CYLINDER SPEED.
The data in the following chart refers to the piston stroke in mm for each pump handle stroke.
MOTOR DRIVEN PUMPS.
The data in the following chart refers to the piston speed in mm for second
Europress quality certification
All EUROPRESS products are covered by a one year guarantee against any defects in materials or workmanship. This guarantee does not cover normal wear and tear, improper use or any applications not in compliance with our recommended instructions, or where the equipment is used with unsuitable fluids, modifications and/ or alterations (including those resulting from repair or attempted repair by persons not authorized by EURO PRESS PACK), or damage caused by transportation.
To report any flaw, defect, non conformity, and/or to claim action under this guarantee, the Customer shall inform EURO PRESS PACK in writing within 5 days after receipt of the goods, or in case of hidden defect, within 5 days after such defect has been discovered. Before returning the goods to EURO PRESS PACK for possible remedy under guarantee, the purchaser shall have received EURO PRESS PACK’s authorization . If EURO PRESS PACK is firmly convinced that its own product is defective, EURO PRESS PACK will provide free of charge for repair or replacement. The transport costs to and from EURO PRESS PACK are at the customer’s charge.
If the intervention of EURO PRESS PACK personnel or of our authorized distributors is requested on the site for installation of the replaced items (provided it is ascertained that they are covered by this guarantee) the costs of transfer of such personnel, their travelling hours and travel expenses are at the Customer’s charge, whereas only the actual working hours will be at the charge of EURO PRESS PACK or of its authorized distributor.
THE ABOVE GUARANTEE IS THE ONLY GUARANTEE ACKNOWLEDGED AND RECOGNIZED BY EURO PRESS PACK AND IT REPLACES ANY AND ALL OTHER EXPLICIT OR IMPLICIT GUARANTEES REGARDINGTHEPRODUCTSMANUFACTURED AND MARKETED BY EURO PRESS PACK, AS TO THEIR MARKETABILITY OR SUITABILITY FOR SPECIFIC APPLICATIONS.
IT IS HEREBY EXPRESSLY STATED THAT ANY CHARGES AND/OR LIABILITY OF EURO PRESS PACK ARE EXCLUDED REGARDING:
- ANY ACCIDENTAL OR CONSEQUENTIAL DAMAGES CAUSED BY DEFECTIVE OR NON CONFORMING PRODUCTS, BY NEGLIGENCE OR OTHERWISE;
- DAMAGE DUE TO OTHER CAUSES INCLUDING, BUT NOT LIMITED TO NEGLIGENCE OF EURO PRESS PACK;
- ANY OTHER OBLIGATION OR LIABILITY DERIVING FROM BREACH OF CONTRACT OR OF GUARANTEE.
THIS GUARANTEE WILL NOT BE EFFECTIVE IN CASE OF EVEN PARTIAL DEFAULT IN PAYMENT FOR THE SUPPLIED GOODS, INCLUDING INVOICES FOR TECHNICAL ASSISTANCE SERVICES.
The maximum amount payable by EURO PRESS PACK for damages will at all events be limited to the actually paid purchase price and shall therefore never exceed this price.
Euro Press Pack has always been a Company very attentive to quality norms. This means that both the design of our products than their manufacturing are planned considering the Good Manufacturing Practice.All necessary controls are made to grant our customers the highest possible quality standard. In this way the final product is produced and checked according to the defined procedures and this assures that the quality system is efficient, controlled and proved.
QUALITY SYSTEM CERTIFICATE ISO 9001
Certification for design, manufacturing, marketing and repair of high pressure components.
ENVIRONMETAL SYSTEM CERTIFICATE ISO 14001
System certification for design and manufacture, through the various step of cutting, mechanical machining, surface treatments, painting, assembly, testing, packing and dispatch, sales and service of high pressure hydraulic fluid components.
All cylinders comply to the standard laid down by the American National Standards institute (apart from CGS#P#, CGG#P#, and CGR cylinders).
The electric parts of the machines are made according the standard of EN 60204-1.
The 700 bar hoses exceed this norm.
Direttive CE 2006/42/CE – CE 2006/95/CE – CE 2004/108/CE
All our power packs conform the CE norm on the machine directive, low tension and electromagnetic compatibility.
All EUROPRESS products meet the European safety directives. Except certain systems or utensils which are designed for a specific use and are certified as machineries, all the cylinders, pumps and power packs of generic purpose are accompanied by certificates. The CE certification is responsibility of the construction of the machinery in which all the components are assembled.