Page 3 - Parker - Technical Data

Catalog HY15-3502/US
Technical Information Technical Data

CV
SEAL MATERIAL SELECTION Thus, the “D”-Ring outperforms standard polyurethane
o-rings, especially when using high water content fluids
You should match the seal compatibility to the tem-
at elevated temperatures. The “D”-Ring is compatible Check Valves
perature and fluid being used in your application.
with most water-glycol, water/oil emulsions, and high
Parker offers three seal materials to meet your applica- SH
grade petroleum based hydraulic fluids at tempera-
tion requirements. Parker’s standard material is a 4301
tures between -45°C to +93°C (-50°F to +200°F)
Polyurethane RESILON™ material “D”-Ring. We also
offer Fluorocarbon and Nitrile seals. A brief synopsis of The unique shape of the Parker “D”-Ring also provides Shuttle Valves
each seal material is given below to help you choose a variety of design advantages. The seal is molded into
the best seal for your application. a “D” shape where the seal is higher in the middle and LM
lower on the ends. This prevents the seal edge from
“D”-Ring (4301 Polyurethane RESILON™ Material) Load/Motor
folding over on a corner inside the manifold during Controls
The “D”-Ring is the standard seal material on the
installation. In addition, this design has a minimal lip,
Winner’s Circle threaded cartridge valves. The “D”-
thus, friction is reduced. Another unique feature of the FC
Ring is molded of a special 4301 Polyurethane
“D”-Ring is its symmetrical design, resulting in no
RESILON™. Polyurethane materials exhibit better
performance degradation from the reverse direction, or
wear resistance and tensile strength than standard Controls
worry of backward installation. The “D”-Ring is also Flow
Nitrile or Fluorocarbon material. In addition, it has an
equipped with “pressure pedestals” to reduce the
excellent resistance to compression set. This in- PC
effects of “blow-by” common in reverse cycling. The pres-
creased strength eliminates the need for back-rings
sure pedestals increase the sealing capability of the
and simplifies installation.
“D”-Ring, by reducing the radial pressure forces that Pressure Controls
The 4301 compound is a Parker exclusive material compress the sealing face of the o-ring. The drawing
designed to prevent hydrolysis at high temperatures. below depicts the shape and highlights the features. LE
No Backup Rings 4301 RESILON™ Material Logic Elements
The increased wear resistance and Specially designed Parker exclusive
strength of polyurethane eliminates 4301 Polyurethane RESILON™
the need for backup rings, thus prevents hydrolosis better than other DC
Directional Controls
minimizing installation issues. polyurethane materials.

MV

Manual Valves
“D” Shape
Unique “D” shape provides
sealing in the critical areas Pressure Pedestals Reduced Lip SV
while reducing the chance Specially molded pressure The unique shape reduces
of a seal being cut during pedestals help reduce the the lip and thus the amount
Solenoid Valves
manifold installation. effects of “blow-by” of wear due to friction.
Nitrile Fluorocarbon PV
Nitrile o-rings are also compatible with most water- Fluorocarbon o-rings are compatible with most phos-
glycol, water/oil emulsions, and high grade petroleum phate ester fluids and phosphate ester blends. Parker Proportional
based hydraulic fluids. Parker only recommends Nitrile only recommends Fluorocarbon seals for temperatures Valves
o-rings for temperatures between -40°C to +93°C between -32°C to +121°C (-25°F to +250°F). Fluoro-
(-40°F to +200°F). Nitrile o-rings do require a full back- carbon o-rings do require a full back-up ring, or two CE
up ring, or two half back-ups. half back-ups.
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Bodies & Cavities

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Technical Data

TD2 Parker Hannifin Corporation
Hydraulic Cartridge Systems