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ADVANCED TRANSFER AND CONNECTION SOLUTIONS
Fluid and Gas
封面
In the field of precision machining, there is a group of craftsmen
who relentlessly pursue perfection, expressing the beauty of
industry through their skilled hands. For more than a decade,
our founding team has been dedicated to the manufacturing of
fluid valves, deeply cultivating the European and American
markets, and earning the trust of overseas customers with outstanding quality.
in recent years, the company has undergone a strategic
upgrade in its development direction, shifting its focus to the
research, development, and production of dry disconnect
couplings and breakaway couplings. Guided by the belief that
true expertise comes from focus, we are committed to building
the influence of the SOTUS brand.
Craftsmanship Shapes Quality,
Global Vision Shapes the Future
About SOTUS
01
Our Advantages
Exquisite Precision Machining
Technology:
We possess world-class precision machining equipment and
technologies, enabling us to produce high-quality fluid connection devices with exceptional dimensional accuracy and reliable
performance. From design to production, every stage undergoes strict quality control and rigorous testing to ensure that our
products meet — and often exceed — customer expectations.
Forward-Looking Safety Philosophy:
Keeping pace with industry trends, we are committed to minimizing harmful emissions and preventing leaks of both liquid and
vapor phases during the transfer and distribution of VOCs. Our
goal is to ensure efficient and safe fluid handling across industrial
applications.
Extensive Industry Experience:
With years of export experience, we have developed a deep
understanding of the requirements and standards of the European and American markets. SOTUS is well-versed in the
refined production practices and certification standards of
these regions, allowing us to provide products and services
that fully comply with international norms.
02
Application Fields for Dry Disconnect
and Breakaway Couplings
PETROCHEMICAL
INDUSTRY
Top and bottom loading/unloading of tank trucks and tank containers
Manifolds and feed/discharge pipelines in chemical mixing systems
Internal transfer and distribution of chemicals within plants
Transfer between dual-fuel vessels, bunkering ships, and liquid cargo terminals
Liquid and fuel transfer operations for PSV and PSO.
Marine IBCs and pipeline systems on vessels
Storage, transfer, and fueling of rocket liquid fuels and propellants
Aviation kerosene and SAF applications in airport fueling systems
Vehicle test benches and performance testing systems
Other Industrial Applications
MARINE & OFFSHORE
INDUSTRY
AEROSPACE
INDUSTRY
03
Our products can be
installed on :
Transfer hoses, including metal, composite, and rubber hoses
Loading arms equipped with swivel joints
Fueling skids and metering skid modules
IBC tanks and tank containers
04
Breakaway Couplings In the connected state, the breakaway coupling allows liquids or gases to flow normally with minimal
flow resistance. The two halves of the valve body are sealed by an O-ring at the mating surface,
ensuring zero leakage during transfer.
When subjected to an excessive load, the break studs shear and release the two valve halves,
simultaneously activating the spring-loaded poppets, which close the flow path instantly. The pressure of the transferred liquid or gas remains contained within both valve halves until the pipeline is
depressurized or drained. At that point, the breakaway coupling can be inspected for damage, and
a service kit can be installed to restore it to full functionality. Once new break studs are fitted, the
coupling can be returned to operation.
The SBAC Series Breakaway Couplings utilize break studs as the core separation mechanism.
Safety is at the heart of their design — they are engineered to protect fluid transfer systems from
damage while minimizing product loss.
This series combines optimized flow performance with an innovative poppet design. In the event of
an accidental drive-off or unexpected movement of a vehicle or vessel, the break studs activate
under tension or shear force, causing the coupling to separate into two halves. Both valve halves
instantly close, preventing the leakage of potentially hazardous substances.
05
Connected State Diagram
Disconnected State Diagram
06
Easy on-site reset — quick and simple to reassemble with minimal downtime,
saving both time and cost.
Dual-cone poppet support — enables high flow capacity while preventing
deformation under stress.
Pressure-independent spring design — the spring mechanism remains unaffected
by pressure fluctuations and does not interfere with the flow path
ADVANTAGES
HIGHLIGHT
Technical Specification
Size
Material Options
Sealing Materials
End Connections
Test Pressure
Release Angle
1” (DN25) - 4” (DN100)
Up to 40 bar
0?90°
Aluminum alloy, stainless steel, special alloys
FKM (Viton), EPDM, FFKM (Perfluoroelastomer)
NPT / BSP / PN25/40 / ANSI 150 / 300 / TTMA
The tri-star poppet features a conical support frame combined with a coneshaped valve core, forming a dual-cone valve structure with a self-tightening
effect. This design provides excellent pressure-bearing performance and
compared with traditional flat poppets, significantly reduces turbulence and
minimizes flow resistance. It also prevents axial displacement of the poppet
caused by asymmetric pressure, thereby avoiding flow reduction and ensuring
stable, high-efficiency operation.
07
API Dry Couplers
The SOTUS DCA Series Semi-Automatic Dry Couplers comply with the API RP 1004 8th Edition
(2003) bottom loading coupling standard.
Compared with manual dry disconnect couplings, the semi-automatic version offers a higher degree
of automation, enabling faster connection and disconnection while reducing the risk of human error,
ensures a tight and reliable seal at the connection point, effectively preventing leakage and ensuring
safe, efficient fluid transfer.
?Easy seal replacement — the main nose seal can be replaced without removing the
coupling from the loading arm.
?No pins or threads — quick and simple disassembly and maintenance via Type-B
retaining pins.
?Four truly interlocking stainless steel claws guarantee a secure, non-loosening connection.
?Stainless steel shell and hard-anodized body reflect exceptional durability and long
service life.
?Proven sealing design ensures extremely low residual spillage upon disconnection.
Features of the DCA Series Dry Couplers: 08
Fully stainless-steel API couplers are available for applications requiring higher pressure ratings.
Available Seal Options
Operating Pressure
6 bar ( 87 PSI )
Test Pressure
9bar (131 PSI)
Design Pressure
25bar (363 PSI)
As the temperature drops, does your confidence in the sealing performance ?
In the past, during cold weather,the only frustrating solution to leakage problems was simple: wait for
warmer temperatures.
SOTUS now offers low-temperature O-rings designed to perform reliably even in extreme cold climates,
maintaining flexibility and tight sealing performance under severe freezing conditions.
FKM (Fluoroelastomer)
EPDM (Ethylene Propylene
Diene Monomer Rubber)
FFKM (Perfluoroelastomer)
FKM-LT / FFKM-LT (Low-Temperature Grades)
09
Mounting Interface:
Size: 4 inches (100 mm) TTMA flange Bolt Holes: 8 holes, each approximately ?11 mm
Bolt Circle Diameter (BCD): approximately 149 mm Flange Outer Diameter: approximately 168 mm
Dimensional Diagram
Fluid Flow Connection Diagram
10
API Bottom Tanker Adaptor
(Discharge Valve)
The DCA-A Bottom Tanker Adaptor (Discharge Valve) is designed for bottom loading and gravity unloading
operations on road tankers, in full compliance with the API RP 1004 standard. It is used in conjunction with the
API dry couplers. Flat-bottom design to ensure complete drainage of liquid products during unloading.
The discharge valve effectively prevents product
leakage during disconnection, minimizing loss
and environmental contamination.
Excellent sealing capability — even when not
connected to the API dry disconnect coupling —
ensuring that no product escapes from the
tanker.
Body Materials:
Hard-Anodized Aluminum Alloy Stainless Steel
PREVENTION OF
MATERIAL LEAKAGE
RELIABLE SEALING
PERFORMANCE
Designed to withstand the internal pressure of
the tanker, the discharge valve ensures safe and
leak-free operation during both loading and
unloading processes.
Once the opening angle is set, unloading or
sampling operations can be performed without
the need to connect the API dry disconnect
coupling.
PRESSURE
RESISTANCE
DISCHARGE
VALVE HANDLE
01 02
03 04
11
The SOTUS DCS STANAG 3756 Dry Disconnect Coupling is designed for safe, quick, and leak-free connection
and disconnection of fluid transfer lines.
Originally developed for military applications—such as rapid refueling of aircraft, vehicles, and ground equipment—it has since been widely adopted in civilian industries due to its outstanding performance. Today, it is
extensively used in sectors requiring high safety and reliability, including chemical processing, new energy
liquid fuels, and offshore platforms.
SOTUS DCS Series Dry Disconnect Couplings
Dry Disconnect Couplings
Key Features of the DCS Dry Disconnect Coupling:
Manufactured from
high-strength,
corrosion-resistant
materials, with
wear-resistant
components at key
points for extended
service life.
Some models
feature a visual
indication of
connected or
disconnected status,
helping operators
confirm coupling
positions easily and
safely.
Modular design
enables quick
replacement of
components,
simplifying service
operations.
Fully interchangeable
with equivalent models
from major brands such
as TODO, MannTek,
St?ubli.
High Reliability
and Durability
Clear Status
Indication
Easy Mainte- nance
Excellent
Compatibility
12
The following figure shows the coupling between the
male and female halves.
Working Principle:
After inserting the female coupler into the male adapter, turn it 15° clockwise — the two halves are now
positioned and sealed, During the subsequent 90° rotation, the valves open gradually until reaching the
fully open position. Disconnection is achieved by turning 105° counterclockwise.
Complies With EU Pressure Equipment Directive 2014/68/EU (PED)
Safety Requirements
Size
Material
Seals
End Connection
Working Pressure
Test Pressure
1” (DN25) - 8” (DN200)
up to 25 bar
Working Pressure + 50%
Aluminum Alloy, Stainless Steel, Nickel-based Corrosion-resistant Alloy
FKM, EPDM, FFKM
NPT / BSP / PN25/40 / ANSI 150 / 300
Technical Parameters: 13
Examples of applications in different sizes
SOTUS 1” DN25, Φ56 mm:
SOTUS 2” DN 50, Φ 70 mm SOTUS 3” DN 80, Φ 119 mm
Compact size allows one-hand operation, with extremely low spill volume during disconnection, ideal for confined spaces
Transfer and dispensing of small batches of high-value chemicals, such as laboratory reagents
or specialty chemicals
Small-scale systems or equipment, including tank units, mobile refueling systems, and small
reactors
Suitable for medium-flow applications:
Transfer of chemical products such as acids, alkalis, and solvents
Petrochemical products such as refined oil, gear oil, and lubricants
Transfer of paints, coatings, and thinners
For loading and unloading tank trucks or tankers
Transfer of electrolytes, coolants, and alkane-based media
SOTUS 4” DN100 Φ164 mm SOTUS 6” DN150 Φ238 mm
Typically used for railway tankers and high-flow marine and offshore applications:
Offshore vessels and platforms for fuel, potable water, and chemicals
Ship-to-ship and ship-to-shore bunkering of methanol, ammonia, etc.
Loading and unloading of large oil or chemical tankers at ports and terminals
Aircraft refueling and railway tanker loading/unloading
14
SOTUS DCT Series Dry Disconnect Couplings
— Safe · Efficient · Zero Leakage
Enhanced Performance And Efficiency
Optimized flow path design for lower pressure drop and higher flow rate
Excellent vibration resistance to ensure stable operation
Designed for long-term performance under demanding industrial conditions
Flat-face design prevents air ingress and eliminates medium spillage during disconnection
Dual-sealing throughout the process protects both operators and the working environment
Effectively prevents resource waste and environmental risks
Size
Materials
Seals
End Connections
Working Pressure
Test Pressure
1” (DN25) - 3”(DN 80)
up to 25 bar
Working Pressure +50%
Stainless Steel, Nickel-based Corrosion-resistant Alloy
FKM (Viton?), EPDM, FFKM (Perfluoroelastomer)
BSP Thread / PN25/40 / ANSI 150 / 300 Flange
Zero
Leakage
Zero 0 0 Contamination
Push and twist — connect or disconnect in just two seconds
Clockwise rotation of 110° opens the valves simultaneously
Counterclockwise rotation triggers instant valve closure
Simple Operation
Fast and Safe
Technical Specifications:
15
Flow path without moving parts, lower pressure drop
Mechanical components are completely isolated from the medium
Designed for quick cleaning and easy maintenance.
Rugged construction with high-grade stainless steel for extended
service life.
Remains reliable even under pressure and vibration conditions.
Petrochemical applications such as toluene, ethylene oxide, acrylic acid, and electrolyte solutions.
Pharmaceutical and fine chemical industries, as well as nuclear power and other high-risk media environments.
Safety Assurance,
Multiple Protections
Compatibility: Can be interchanged and coupled with equivalent products from
MannTek and St?ubli.
16
Time-Saving
High Reliability
Long Service Life
Economic
Zero Contamination
No need for draining — operate directly.
No spillage throughout the process.
Protects both the environment and operator.
Well-engineered design with robust construction.
Premium materials ensure minimal wear and extended durability.
Why Choose DCT Dry
Disconnect Couplers?
Not just an industrial coupling — but a trusted partner that
ensures safe operations, improves work efficiency, and
supports environmental compliance.
SOTUS has always focused on the design
and manufacturing of precision fluid couplings, building on a foundation of professionalism and responsibility, and continuously pursuing excellence in manufacturing
quality. The company brings together a
team of highly experienced technicians
who are skilled in CNC lathes and machining center processes, ensuring precise
control over every step to guarantee product stability and consistency.
All dry disconnect couplings and breakaway valves undergo 100% pressure testing and are provided with traceable serial
codes.
17
SOTUS places great emphasis on sustainable development and social responsibility. The company
ensures the quality of every weld while strictly adhering to green development principles. By
optimizing production processes, reducing resource consumption, and minimizing carbon emissions, SOTUS actively promotes the digitalization and green transformation of traditional manufacturing.
A comprehensive inventory and spare parts management system enables SOTUS to provide
customers with efficient and reliable supply services. Guided by the philosophy of “Focus on Today,
Vision for Tomorrow,” the company continuously pursues technological innovation and product
breakthroughs.
In terms of quality control, SOTUS adheres to strict standards to evaluate its manufacturing
capabilities. High-precision inspection equipment, including coordinate measuring machines,
vision measurement systems, and handheld spectrometers, provides comprehensive quality
assurance throughout production. Every detail undergoes rigorous inspection.
The use of high-quality cutting tools, combined with efficient machining processes, ensures that
components not only achieve exceptional surface finish but also maintain high dimensional
consistency. 18
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