Specifications

Pneumatic Tie Rod Cylinders
Series VE
Parker Hannifin Corporation
Cylinder Division
Des Plaines, Illinois USA
www.parker.com/cylinder
15
Catalog HY08-0948-3/NA
Cylinder Safety Guide
Before selecting or using Parker Hannifin Corporation (the Company) cylinders
or related accessories, it is important that you read, understand and follow the
following safety information. Training is advised before selecting and using the
Company’s products.
1.0 General Instructions
1.1 Scope–Thissafetyguideprovidesinstructionsforselectingandusing
(including assembling, installing, and maintaining) cylinder products. This
safety guide is a supplement to and is to be used with the specific Company
publications for the specific cylinder products that are being considered for
use.
1.2 Fail Safe–Cylinderproductscananddofailwithoutwarningformany
reasons. All systems and equipment should be designed in a fail-safe mode
so that if the failure of a cylinder product occurs people and property won’t be
endangered.
1.3 Distribution–Provideafreecopyofthissafetyguidetoeachperson
responsible for selecting or using cylinder products. Do not select or use
the Company’s cylinders without thoroughly reading and understanding this
safety guide as well as the specific Company publications for the products
considered or selected.
1.4 User Responsibility–Duetoverywidevarietyofcylinderapplications
and cylinder operating conditions, the Company does not warrant that any
particular cylinder is suitable for any specific application. This safety guide
does not analyze all technical parameters that must be considered in select-
ing a product. The hydraulic and pneumatic cylinders outlined in this catalog
are designed to the Company’s design guidelines and do not necessarily
meet the design guideline of other agencies such as American Bureau of
Shipping,ASMEPressureVesselCodeetc.Theuser,throughitsown
analysis and testing, is solely responsible for:
 • Makingthefinalselectionofthecylindersandrelatedaccessories.
 •Determiningifthecylindersarerequiredtomeetspecificdesignrequire-
ments as required by the Agency(s) or industry standards covering the
design of the user’s equipment.
 •Assuringthattheuser’srequirementsaremet,OSHArequirementsare
met, and safety guidelines from the applicable agencies such as but not
limited to ANSI are followed and that the use presents no health or safety
hazards.
 •Providingallappropriatehealthandsafetywarningsontheequipmenton
which the cylinders are used.
1.5 Additional Questions–CalltheappropriateCompanytechnicalservice
department if you have any questions or require any additional information.
See the Company publication for the product being considered or used, or
call 1-847-298-2400, or go to www.parker.com, for telephone numbers of the
appropriate technical service department.
2.0 Cylinder and Accessories Selection
2.1 Seals–Partoftheprocessofselectingacylinderistheselectionof
seal compounds. Before making this selection, consult the “seal information
page(s)” of the publication for the series of cylinders of interest.
The application of cylinders may allow fluids such as cutting fluids, wash
down fluids etc. to come in contact with the external area of the cylinder.
These fluids may attack the piston rod wiper and or the primary seal and
must be taken into account when selecting and specifying seal compounds.
Dynamic seals will wear. The rate of wear will depend on many operating
factors. Wear can be rapid if a cylinder is mis-aligned or if the cylinder has
been improperly serviced. The user must take seal wear into consideration in
the application of cylinders.
2.2 Piston Rods–Possibleconsequencesofpistonrodfailureor
separation of the piston rod from the piston include, but are not limited to are:
 •Pistonrodandorattachedloadthrownoffathighspeed.
 •Highvelocityfluiddischarge.
 •Pistonrodextendingwhenpressureisappliedinthepiston
retract mode.
Piston rods or machine members attached to the piston rod may move
suddenly and without warning as a consequence of other conditions
occurring to the machine such as, but not limited to:
 •Unexpecteddetachmentofthemachinememberfromthepistonrod.
 •Failureofthepressurizedfluiddeliverysystem(hoses,fittings,valves,
pumps, compressors) which maintain cylinder position.
 •Catastrophiccylindersealfailureleadingtosuddenlossofpressurized
fluid.
 •Failureofthemachinecontrolsystem.
Follow the recommendations of the “Piston Rod Selection Chart and Data”
in the publication for the series of cylinders of interest. The suggested piston
rod diameter in these charts must be followed in order to avoid piston rod
buckling.
Piston rods are not normally designed to absorb bending moments or loads
which are perpendicular to the axis of piston rod motion. These additional
loads can cause the piston rod to fail. If these types of additional loads are
expected to be imposed on the piston rod, their magnitude should be made
known to our engineering department.
The cylinder user should always make sure that the piston rod is securely
attached to the machine member.
On occasion cylinders are ordered with double rods (a piston rod extended
from both ends of the cylinder). In some cases a stop is threaded on to one
of the piston rods and used as an external stroke adjuster. On occasions
spacers are attached to the machine member connected to the piston rod
and also used as a stroke adjuster. In both cases the stops will create a pinch
point and the user should consider appropriate use of guards. If these
external stops are not perpendicular to the mating contact surface, or if debris
is trapped between the contact surfaces, a bending moment will be placed
on the piston rod, which can lead to piston rod failure. An external stop will
also negate the effect of cushioning and will subject the piston rod to impact
loading. Those two (2) conditions can cause piston rod failure. Internal stroke
adjusters are available with and without cushions. The use of external stroke
adjusters should be reviewed with our engineering department.
The piston rod to piston and the stud to piston rod threaded connections are
secured with an anaerobic adhesive. The strength of the adhesive decreases
with increasing temperature. Cylinders which can be exposed to tempera-
tures above +250°F (+121°C) are to be ordered with a non studded piston
rod and a pinned piston to rod joint.
2.3 Cushions–Cushionsshouldbeconsideredforcylinderapplications
when the piston velocity is expected to be over 4 inches/second.
Cylinder cushions are normally designed to absorb the energy of a linear
applied load. A rotating mass has considerably more energy than the same
mass moving in a linear mode. Cushioning for a rotating mass application
should be review by our engineering department.
2.4 Cylinder Mountings–Somecylindermountingconfigurationsmayhave
certain limitations such as but not limited to minimum stroke for side or foot
mounting cylinders or pressure de-ratings for certain mounts. Carefully review
the catalog for these types of restrictions.
Always mount cylinders using the largest possible high tensile alloy steel
socket head cap screws that can fit in the cylinder mounting holes and torque
them to the manufacturer’s recommendations for their size.
2.5 Port Fittings–Hydrauliccylindersappliedwithmeteroutordecelera-
tion circuits are subject to intensified pressure at piston rod end.
The rod end pressure is approximately equal to:
operating pressure x effective cap end area
effective rod end piston area
Contact your connector supplier for the pressure rating of individual
connectors.
3.0 Cylinder and Accessories Installation and Mounting
3.1 Installation
3.1.1 –Cleanlinessisanimportantconsideration,andcylindersare
shipped with the ports plugged to protect them from contaminants enter-
ing the ports. These plugs should not be removed until the piping is to
be installed. Before making the connection to the cylinder ports, piping
should be thoroughly cleaned to remove all chips or burrs which might
have resulted from threading or flaring operations.
Safety Guide for Selecting and Using Hydraulic, Pneumatic Cylinders and Their Accessories
WARNING: FAILURE OF THE CYLINDER, ITS PARTS, ITS MOUNTING, ITS CONNECTIONS TO OTHER OBJECTS,
OR ITS CONTROLS CAN RESULT IN:
 •Unanticipatedoruncontrolledmovementofthecylinderorobjectsconnectedtoit.
 •Fallingofthecylinderorobjectsheldupbyit.
 •Fluidescapingfromthecylinder,potentiallyathighvelocity.
THESE EVENTS COULD CAUSE DEATH OR PERSONAL INJURY BY, FOR EXAMPLE, PERSONS FALLING FROM
HIGH LOCATIONS, BEING CRUSHED OR STRUCK BY HEAVY OR FAST MOVING OBJECTS, BEING PUSHED INTO
DANGEROUS EQUIPMENT OR SITUATIONS, OR SLIPPING ON ESCAPED FLUID.