Page 476 - 4300 Catalog Cover.pdf

U24

Parker Hannifin Corporation

Tube Fittings Division

Columbus, Ohio

4300 Catalog

General Technical

Dimensions and pressures for reference only, subject to change.

Fitting and Adapter Pressure

Ratings

Pressure Ratings

Pressure ratings shown on the product pages of this catalog are

for dynamic systems.Avastmajorityof systemswhereour fittings

are used fall in this category. However, there are applications,

suchas hydraulic jacks, where the systempressure is essentially

static once it is pressurized. For this type of an application the

fittings can be used at higher pressures.

The dynamic and static systems can be defined as follows:

Dynamic:

Asystem inwhich theoperatingpressurefluctuates, in

accordance with load, up to a maximum pressure limited by the

relief valve. In addition, the systemmay also experience shocks,

vibration and temperature excursions. Example: A backhoe.

Static:

A system, once pressurized, is essentially free of pres-

sure fluctuations, shock, vibration and temperature excursions,

with such pressurizations not exceeding 30,000 in the life of the

system. Example: A hydraulic jack.

The dynamic pressure ratings are based on a minimum design

factor of 4. In other words, the fitting is capable of holding a

pressure equal to 4 times the rated pressure before leakage

or failure. For static applications, the design factor can be 3.

Hence, the static rating can be determined by multiplying the

dynamic rating by 1.33.

Static pressure rating = 1.33 x Dynamic pressure rating

Example: Static pressure rating for a fitting rated at 6000 psi =

1.33 x 6000 = 8000 psi

Higher (dynamic) Ratings

Some parts are capable of performing at higher pressures than

those shown on the product pages. For information on higher

rating