Page 46 - ParkerQuickCouplingCatalog38002010

Quick Coupling Division
8145 Lewis Road • Minneapolis, MN 55427
www.parker.com/quickcouplings B-2
Hydraulic Quick Couplings
B
Hydraulics
Introduction
Double Shut-Off and Straight-Thru Couplings
Parker hydraulic couplings have a wide variety of designs,
each tailored to a particular application or use. This catalog is
arranged according to those categories. In each section the
construction of a specific design will be detailed. However,
based on the valving of the coupling, hydraulic couplings
generally fall into one of two groups, either Double Shut-Off
or Straight-Thru.
Double Shut-Off couplings are used extensively when it is
important to minimize fluid loss upon disconnection. Both
halves of the coupler, the body and the nipple, contain shut-
off valves. These valves open automatically when the body
and nipple are connected, and close automatically when the
two halves are disconnected—keeping fluid loss to a
minimum.
Parker Straight-Thru couplings have no valves in either half
and are ideal for maximum flow application. Their smooth,
open bore offers the lowest pressure drop of any quick
disconnect coupling, and allows them to be thoroughly
cleaned. Since there are no valves in either half, fluid flow
should be shut off before the coupling is disconnected.
Rated Pressure
Rated pressure for the Parker hydraulic couplings range from
30 to 15,000 psi, depending on the coupling series, size and
materials. Rated pressures as shown in this catalog are
defined by ISO 5598, as “the qualified operating pressures
which are recommended for a component or a system by the
manufacturer.” Parker “Rated Pressures” have been
established on the basis of laboratory tests which include, but
are not limited to, static burst tests and multiple cycle impulse
tests. System characteristics such as high cycling rates and
high amplitude shocks either hydraulic or mechanical, can
reduce the functioning life of a coupling,
even if the system’s nominal pressure falls within the rated
pressure range of the coupling.
For assistance in analyzing your application, contact your
nearest Parker sales office or the Quick Coupling Division
in Minneapolis.
Refer to the Safety Guide at the end of this catalog for
considerations when selecting a Quick Coupling.
Refer to the Fluid Compatibility Chart (note Table of Contents)
for seal selection assistance for both Double Shut-Off and
Straight-Thru couplings.
Checklist for Selecting Quick Couplings
What are the functional requirements of the coupling?
What is the maximum working pressure of the application?
Which seals and body material are compatible with the
system’s fluid?
Is the application static or dynamic?
What size coupler is required?
What is the maximum pressure drop suitable for
the application?
Does the application require the ability to connect
and disconnect under pressure?
What is the media temperature and ambient temperature?
What end configurations are required?
Is an industry interchange coupler required?
Is air inclusion and fluid loss a concern in the application?