Appendix
X
Appendices
Parker Hannifin Corporation
Quick Coupling Division
Minneapolis, MN
www.parker.com/quickcouplings
Air Inclusion:
The ambient atmosphere forced into the system
during the connection of the quick disconnect halves.
Break-Away:
Automatic disconnection of a coupling when an
axial separation force is applied.
Brinelling:
Dimples or grooves worn into the shoulder of a
male half by the locking balls in the female half.
Burst Pressure:
The pressure at which a device loses the
capability to retain pressure.
Case Hardening:
Hardening the surface of low carbon steel.
Cold Flow:
Continued deformation under load.
Connect Under Pressure:
Ability to connect coupling halves
with internal line pressure applied to either both sides or
one side.
Coupling, Female Half:
Other nomenclature “coupler”,
“
socket”, “body”.
Coupling, Male Half:
Other nomenclature “nipple”, “plug”,
“
adapter”.
Coupling, Quick Disconnect:
A component which can
quickly join or separate a fluid line without the use of tools
or special devices.
Differential Pressure (ÆP):
The difference in pressure
between any two points of a system or a component.
Double-Acting Sleeve:
Permits push-to-connect and pull-to-
disconnect convenience on implement line when female half
is clamp mounted and connected with a hose.
Dust Cap:
Dust or dirt repelling enclosure for both halves.
Dust Plug:
Dust or dirt repelling enclosure both halves.
Flow Checking:
Occurs when a nipple valve closes during
flow conditions, such as when quickly lowering a heavy
implement.(Also called Check Off, Back Checking or Lock-up.)
Flush Position (Valve):
When the coupler valve is fully open,
allowing maximum oil flow.
Force to Connect:
Axial and/or rotational force required to
make a complete connection.
Force to Disconnect:
The reverse of the above.
Induction Hardening:
Localized hardening of medium
carbon steel.
Peak Pressure:
Maximum momentary pressure encountered
in the operation of a component.
Pressure Cap:
Cap which incorporates a seal capable of
withstanding the rated pressures on the male half.
Pressure Impulse Test:
Subjecting a component to a specified
pressure at a specified rate of increase or decrease for a
specified time limit.
Pressure Operating:
The pressure at which a system
is operated.
Pressure Plug:
Plug which incorporates a seal capable of
withstanding the rated pressures on the female half.
Proof Pressure:
The non-destructive test pressure in excess
of the maximum rated operating pressure.
Push To Connect (Auto Lock):
Locking arrangement which
permits one handed connection by pushing the nipple into
the coupler.
Rated Pressure:
The maximum pressure at which a product
is designed to operate.
Single-Acting Sleeve:
Permits pull-to-disconnect convenience
on implement line when female body is clamp mounted.
Making connection requires manually pulling female body
forward, inserting male tip, then allowing body and tip to return
to original position in the clamp.
Sleeve Lock:
Arrangement which provides an additional
lock which must be actuated before the locking sleeve can
be retracted.
Spillage:
The fluid removed from the system due to
disconnection of a coupling assembly. This is the fluid
trapped between the mating seal and the valve seal of the
coupling halves.
Surge Pressure:
The pressure existing from surge conditions.
Surge Flows:
A rapid increase in fluid flow.
Thermal Build-Up:
Hydraulic pressure caused by expansion of
the fluid due to heat from an external source such as sunlight.
Trapped Pressure:
Pressurized hydraulic fluid trapped behind
closed coupling valve.
Twist Lock:
A locking arrangement which requires a rotational
actuation to unlock the mating halves.
Types of Quick Disconnect Coupling Valve:
Straight-Thru (ST):
This provides straight through flow.
Double Shut-off Valve (DSO):
A valve in the female half and a
valve in the male half.
Single Shut-off Valve (SSO):
Generally, a valve in the female
half with no valve in the male half.
NOTE:
Refer to Parker’s Publication No. 3800-B1.0: Safety
Guide for Selecting and Using Quick Action Couplings and
Related Accessories.
Glossary of Terms