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Hy-Lok Tube Fittings |
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| Design and Manufacture ▼ |
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Hy-Lok flareless tube fittings have been designed and manufactured with great care to
meet the specifications required for wide to meet the specifications required for wide
range of applications in chemical, petro-chemical, oil refinery, power generation,
shipbuilding, pulp and papers, micro-electronics, tec. Each Hy-Lok tube fitting
consists of four parts; body, front ferrule, back ferrule, and nut. The two-ferrule design,
front and back, compensates for any tolerances in tube O.D., wall thickness, material
hardness and always ensures outstanding leak-tight connections.
Hy-Lok tube fittings
are manufactured under Hy-Lok Corporation's strict quality control program covering A
to Z, which enabled Hy-Lok to obtain ASME certificate for quality system and ISO
9001. |
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| Torque and Distortion during Installation ▼ |
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When the nut is tightened, the back and front ferrules move axially. This axial
movement does not allow any torque transfer form the fitting to the tubing, and the
mechanical properties of tubing is maintained.
During makeup, the back ferrule moves
in such a controlled manner that the tubing is not overstressed and the tubing ID is not
excessively reduced, resulting in safe operation under high pressure or vibration. The
front ferrule does not force the body to expand, which allows the nut to be back off
easily for disassembly and allows remakes many times. |
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| Construction and Tube End Dimensions ▼ |
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The construction and tube end dimensions of both fractional and metric sizes are
shown below with nut in finger tight position. These dimensions are applicable to all
the fittings throughout this catalogue and also to all Hy-Lok ends used as end
connections of Hy-Pro ball valves, needle valves, valve manifolds, check valves, and
relief valves, etc. |
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| Materials ▼ |
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Hy-Lok tube fittings are available as standard in stainless steel, brass and monel.
Straight fittings are machined from cold finished bar stock and shaped bodies from
forgings. Specifications for fitting materials and tubings are listed below. For special
applications, contact your local distributors. |
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Fitting
Material |
Bar
Stock |
Forging |
Tubing |
S.Steel
Type 316 |
ASTM A479
ASTM SA479
ASTM A276
Project 70 - ASTM A276
ASTM A479
jis G4303 |
ASTM A182 F316
ASTM SA182 F316 |
ASTM A269
ASTM A213
ASTM A249
ASME SA213
MIL-T-8504
MIL-T-8506 |
Brass |
ASTM B16 Alloy
360
ASTM B453 Alloy 345 |
ASTM B124 Alloy
377
QQ-B626 Alloy 377 |
ASTM B68
ASTM B75
ASTM B88
ASME SB75 |
Monel
400™
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QQ - N - 281 Alloy
405
QQ - N - 286 Alloy K500
ASTM B |
QQ - N281 - Alloy
400
ASTM B |
ASTM B |
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| Pressure Ratings ▼ |
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Hy-Lok tube fittings are rated to the maximum working pressure of tubings
recommended for use with Hy-Lok tube fittings. The maximum working pressure of
tubings are listed in MAWP Table on the following pages. |
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