The ABALOK® tube fittings are double ferrule type, this means
that they have a front ferrule and a back ferrule. Also, the hole
system is composed by the body and the respective nut.
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When the nut is tightened, both ferrules move axially, advancing
inside the body. This axial movement prevents any kind of torsion
transfer to the tube to conserve its mechanical properties. The
back ferrule constitutes the primary seal of the union, assuring
fundamentally the mechanical fixing of the tube.
During the assembling process, the back ferrule is deformed in a controlled way, obtaining by this way a radial swage on the tube, without reducing excessively its inner diameter. The front ferrule form a full faced seal, preventing the body expansion with its shoulder and allowing the free movement of the nut for further re-assemblies. |
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The ABALOK® tube fittings are manufactured by ABAC SRLThey are used in instrumentation, control systems, chromatography, petrochemistry, refineries, CNG & LPG applications and, in general, for high demanding and reliable applications.
Can be used in:
- High, medium and low pressure.
- Vacuum.
- High temperature.
- Cryogenics applications.
- Vibration applications.
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 Technical data |
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Easy assembly, with low torque |
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No torsion transmission to the tube. All the closing pressures are axially applied along the tube |
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Front ferrule with shoulder, which provides an adjustment limit and keeps the body from expansion due torque excess |
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Minimum reduction of the inner diameter tube |
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No leak risks even with very light gases like helium |
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Three tube subjection points to obtain a better vibration
resistance |
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Perfect seal between the components, after assembly and
in subsequent re-assembly |
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The stainless steel connectors are entirely of AISI 316 and
do not have chemical and/or thermic treatment that could
reduce their corrosion resistance |
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No surface treatment in back ferrules up to 1/2”. Bigger sizes are ion hardening. |
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Internal threads with silver coating to avoid engagements and to reduce the adjustment torque. |
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Design that avoids the nut engagement with the ferrule and
back ferrule kit. (The nut frees without resistance and moves back to the tube when it is unscrewed after the adjustment) |
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 Material and manufacture batch traceability in bodies and nuts.An unerasable engraved number in the pieces assures the traceability. |
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Interchangeability & intermixability
The ABALOK® tube fittings are functionally interchangeable
with other reliable international trademarks like Gyrolok®,
Parker® and Swagelok®, between others.
ABAC guarantees the interchangeability of the ABALOK® nut,
and ferrules system with Swagelok®, Parker® or Gyrolok®
bodies or backwards, without any restriction, to obtain safe,
secure & leak free results until the maximum allowed working
pressures detailed in this brochure.
However, we usually recommend not to mix the ferrules and
back ferrules of different manufacturers in heavy duty applications
with pressures of more than 250 bar, high temperatures,
vibration, etc.
Due to the improved design of the ABALOK® connectors, it can
only be assured the random intermixability without restrictions
with the Gyrolok® connectors because of their design similarity.
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Reliability
The ABALOK® tube fittings are tested under extreme pressure
and service conditions. This is guaranteed by the BVA/GEN/0275
05 certificate provided by the Bureau Veritas, wich has verified
the fulfillment of the IT472 Type Approval of Tube couplings
protocol wich is based on the BS 4368-4 standard.
To obtain this reliability level, the pieces are manufactured &
tested under strict quality assurance standards. Also the pieces
have the following controls during their process:
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- Visual control
- Dimensional control
- Destructive test
- Adjustment and re-adjustment test
All the products are delivered with its respective quality
certificate, detailing the controls performed & fulfilled and the
material traceability. |
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| Destructive test sample. |
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Materials:
- Stainless steel type 316
- Brass
- Others (by request)
Material standards:
- Stainless steel bar according to ASTM A276
- Stainless steel bodies according to ASTM A182 and CF8M
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Pressures Rating
The working pressures of the ABALOK® tube fittings are determinated by the tube characteristics where there are installed. Therefore, the maximum internal pressure limit is provided by the tube, that will collapse before than the connector.
The ends with female or male NPT threads have their own
admissible maximum working pressures. Therefore, when a
connector has ends of this kind, the union service pressure will
be given by the minimum working admissible pressure of the ends that is composed.
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Tube Selection
The suitable selection of the tube is essential to have the best
performance of the connector. The stainless steel tubes must be
seamless, type SS AISI 304, 316 or 316L, according to ASTM
A269, A213 or A632 standards.
The tubes must be annealed, with hardness lower than 90 HRB (recommended 80/82 HRB), its surface has to be free of scratchs, blows and surface abrasion, the wall thickness must be according to the use requirements and be compatible with the process fluid and its temperature.
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Assembly Instructions
The tube fittings ABALOK® are delivered assembled and ready
to use. It is not necessary to disassembly the fitting before using
it because this could introduce dirtiness or strange particles into
the union.
- Cut the tube in square and eliminates the internal and external burr.
- Insert the tube through the nut until the seat bottom. The accessory must be pre-assembly with its body, ferrule and nut. Never the extreme has to be subject to external stress, e.g., traction or flexion, especially in the assembly.
- Finger-tighten the nut clockwise.
- Keep the connector’s body with a wrench and with another
wrench adjust according to the following criteria:
- 1/8” OD extreme: 3/4 turns from the finger-tighten.
- 1/4” to 1” OD extreme: 1 + 1/4 turns from the finger-tighten. For applications at very high pressure, where the fitting will be leave working with only one adjustment, was recommended to made a 1 + 1/2 turn.
For tubing sizes over 1/2”, it is recommended the use of a
pre-setting tool.
For plastic tubing installation, put the INSERT inside the tube
and then into the fitting body. Then proceed according to the
previous instructions.
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1/8” OD extreme
3/4 turn from the finger
tighten. |
1/4” to 1” OD extremes
1+1/4 turns from the
finger tighten. |
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Reassembly Instructions
The tube fitting ABALOK® could be loosening or tightening many times.
- Insert the tube with the pre-assembly ferrules into the
connector until the ferrule is fitted into the body.
- Finger-tighten the nut.
- Tight the nut with a wrench approximately 1/4 turns by going completely to the original position (will be a considerable resistance). Following, tight with the wrench lightly. The readjustment should not be more than a 1/2 turns.
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Pre-assembly
When the fittings have to be installed in uncomfortable places
or in series assembling, it should be better to pre-assembly. The
preassembly means to follow up the steps of the assembly in a
more comfortable place, using the pre-setting tool HPE.
This tool must be fixed in a clamp or similar, where the pre-
assembly has to be done following the assembly instructions.
To mount the union in its place, follow the reassembly instructions.
It is convenient to lubricate the thread of the Pre-assembly tool
at the first time and periodically to obtain a better lifetime of the
tool and to do a low torque during the ferrules swaging.
ABAC propose the use of the manual or hidraulic pre-assembly
tool in installations that have tubing of diameters that are over
1/2” in every application.
For 1” connections, or tubbing walls of more than 2mm, this
tool must be used to obtain a proper swaging of the ferrules to
assure the maximum working pressures specificated.
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Recommendations
- Make sure that the system is not pressurized when tightening or loosening an ABALOK® fitting.
- Do not loosen a ABALOK® nut when relieving or bleeding system pressure.
- Do not exceed maximum allowable working pressure for tubing and the temperature used.
- Before assembling a new ABALOK® tube fitting, loosen the
nut before inserting the tube to allow full insertion of the tube to the seat.
- Always leave a length of straight tube between the tube bend and the fitting.
- During the assembly of the ABALOK® connector, always hold the fitting with one wrench while tighten the nut with another wrench. Follow the same instruction when loosening.
- Always use a ABALOK® tube insert when assembling a ABALOK® fitting to soft, pliable plastic tubing.
- If you have any doubt or question, please, do not hesitate in contact your local ABALOK® distributor.
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WARNING
The content of this publication has different options of products and/or systems to provide the most complete information to technical experienced users.
Because of the different operative conditions and applications of this products, the proper selection of them will be responsibility of the designer and/or user to fullfill the specific application requirements and to ensure proper installation, operation and maintenance of the product. |
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