If you’re having trouble connecting hydraulic quick couplers on your machinery or skid steer attachments, residual pressure trapped in the lines is likely the culprit. When hydraulic fluid heats up or is confined without an outlet, it builds pressure that resists reconnection of quick couplings. Even a slight temperature change can dramatically increase pressure – a mere 1°F increase can spike internal pressure by approximately 100 psiin a sealed hydraulic line.
In this comprehensive guide, we’ll explain why trapped pressure occurs, the safety and downtime consequences of connecting under pressure, and how specially designed connect-under-pressure (CUP) hydraulic couplers solve these problems.
We’ll cover best practices, Stucchi’s innovative CUP products, including connect-under-pressure flat-face hydraulic couplers, thread-to-connect couplings, and multi-coupling solutions. We’ll provide answers to frequently asked questions about connecting under pressure in real-world scenarios, and show you a product matrix for CUP technologies in specific applications. Finally, we’ll ensure that you understand how working pressure, burst pressure, and pressure drop all impact hydraulic systems, as well as how to select the most suitable CUP coupling technologies for your process.
Why Residual Pressure Makes Quick Couplers Hard to Connect
Hydraulic quick couplers are meant to enable fast, tool-free connection and disconnection of hydraulic attachments. However, residual pressure, fluid pressure trapped in one side of the circuit after a line is disconnected, can make it nearly impossible to push couplers together.
This often occurs when an attachment is left in the sun or under working conditions after disconnection; the thermal expansion of the fluid raises its pressure inside the closed circuit.
Even when machinery is off, a change in ambient temperature or heat absorbed during operation can cause the fluid to expand and pressurize the line. The result? The male and female coupler halves cannot overcome the opposing force of that trapped oil pressure, preventing connection.
There are a few common causes for residual pressure:
Thermal Expansion:As temperatures fluctuate (sunlight heating an implement, or fluid warming during operation, then cooling), the trapped fluid expands. Since hydraulic fluid is nearly incompressible and hoses are rigid, even a slight temperature rise causes a significant increase in pressure in a closed circuit.
Incomplete Pressure Relief on Shutdown: When an attachment or implement is disconnected without entirely relieving pressure, fluid under load remains in the lines. Later, when you try to reconnect, that residual pressure pushes back, preventing the male and female couplers from mating.
Actuator Load or Gravity:A hydraulic cylinder or motor under load (e.g., an attachment resting on the ground) can generate pressure in the lines even after the pump is off. Similarly, from a still-pressurized source (pump/accumulator), it will obviously prevent connection; however, here we focus on the static residual pressure that remains once the system is shut off.
Weather/Environmental Effects: Daily temperature fluctuations or exposure to sunlight on stored attachments can lead to pressure buildup. For example, skid steer attachments left in the sun often develop trapped pressure by afternoon, making them hard to hook up.
Leaving fluid in lines overnight: Ambient temperature swings occur overnight. As mentioned, 1°F of temperature rise can add ~100 psi, so a hot afternoon can leave very high static pressure in an attachment that was disconnected in the cool morning.
When an operator tries to connect couplers under these conditions, the flat mating faces won’t budge. No matter how much you push, the internal valves can’t open against the residual pressure. This defeats the purpose of quick couplers; instead of a fast swap, you’re stuck fighting the coupler or resorting to messy workarounds. Connect under pressure hydraulic couplers help to combat connection problems during these circumstances.
The Physics Behind Built-Up Pressure in Hydraulic Systems
When an attachment is disconnected and left sitting, especially in the sun or warm conditions, the hydraulic oil trapped inside its hoses heats up.
As the oil expands, the pressure inside the closed line rises. This thermal expansion creates residual (trapped) pressure in the attachment side of the circuit.
When that pressure is present, standard quick couplers cannot be reconnected by hand. The internal valve is being held closed by the pressurized fluid pushing against it, preventing the coupler halves from locking together.
This is why operators often end up resorting to unsafe and messy workarounds, such as:
Cracking a fitting loose to bleed pressure
Using improvised “pressure release” tools
Striking the coupler body to force a connection
These methods pose risks of oil spray, contamination, component damage, and operator injury. The challenge is especially pronounced with flat-face couplers due to basic fluid mechanics.
The force resisting the connection is determined by:
Force = Pressure × Surface Area
Poppet-style couplers have a small, pointed valve seat, which reduces the area resisting pressure.
Flat-face couplers have a wide, flat sealing surface, allowing the same amount of pressure to act over a much larger surface area.
More surface area = more force resisting connection.
This is why even mild residual pressure can make a flat-face coupler feel “locked” and impossible to connect.
The proven solution is to use a Connect Under Pressure (CUP) coupler. CUP couplers incorporate built-in decompression mechanisms that automatically relieve or equalize pressure during the connection process. This allows the operator to make a clean, safe, by-hand connection without tools, without forcing anything, and without releasing oil.
Consequences of Connecting Hydraulic Couplers Under Pressure
Attempting to connect or disconnect quick couplings under residual pressure is not only frustrating but also dangerous and damaging. Some serious consequences include:
Personal Injury:Forcing a connection under pressure can lead to sudden releases of hydraulic fluid or a violent burst of oil. High-pressure oil injections can penetrate skin and cause toxic, painful injuries requiring surgery or amputation (hse.gov.uk). Even pinhole leaks under pressure create a delicate, high-velocity spray that can cause cuts or burns. If fluid jets out when a coupler finally gives way, it puts workers at risk of injection injuries or burns from hot oil. Fluid at typical operating temperatures (150°F+) will burn on contact, and a pressurized oil spray can ignite into a torch-like fireball if it comes into contact with a spark.
The safety hazards of not addressing residual pressure are severe. Never attempt to open a fitting or strike a coupler to relieve pressure; the results can be catastrophic.
Do not underestimate the danger of hydraulic fluid under pressure.
Equipment & Environmental Damage: Forcing couplers can damage the O-rings and seals, potentially leading to leaks once the connection is made. Repeated struggling causes excessive wear (brinelling) on coupler heads, shortening their lifespan. And when couplers leak upon disconnect, you get messy spills. Hydraulic oil on the ground is an environmental hazard requiring costly cleanup. Leaking couplers on machinery can coat the equipment in oil, attract dirt, and contaminate the job site.
Downtime and Lost Productivity: If couplers won’t connect, the attachment changeover comes to a halt. Operators often end up wasting time trying to relieve pressure or find tools to open a fitting. This unscheduled downtime delays the work and frustrates crews. In industries like municipal snow plowing or roadside mowing, delays can even impact public services. Repeating this scenario frequently undermines one of the most significant advantages of quick couplings – the ease and speed of changing tools.
Improvised Fixes Create Hazards: In practice, many operators resort to loosening a fitting or cracking a coupler open to bleed pressure. Not only is this messy, but it’s also risky – one wrong move and that pent-up oil can spray out. Failing to release pressure properly before maintenance is a key operator error that can lead to injection accidents. Thus, ad-hoc methods of relieving pressure can violate safety protocols and should be avoided whenever possible.
Hot Oil Sprays:Pressurized disconnections or leaks can spray hydraulic oil, a hazardous fluid. Hot oil can cause burns, and any fluid injected under the skin is a medical emergency. Even on a smaller scale, leaking couplers can create slip hazards and lead to environmental contamination. Standard old-style couplers (e.g., ball-poppet types) often spray oil upon disconnect, whereas modern flat-face couplers eliminate most spillage. Minimizing unintended discharges is both a safety and environmental priority.
Bottom line: Never assume a hydraulic line is depressurized. Treat it as if pressure could be present and seek proper solutions rather than brute force. Next, we’ll cover the right ways to handle residual pressure.
Relieve Residual Pressure Safely Before Disconnecting (Manual Method)
The ideal approach is to relieve the pressure in the attachment lines before disconnecting the implement. Many modern machines provide a procedure or a valve to do this. For example, on a skid steer, you might: turn off the engine, cycle the hydraulic controls with the engine off (to allow the fluid to return to the tank), and press any pressure release button or knob provided on newer models. This drains most fluid pressure from the lines. Additionally, ensure that any load on attachments is released (place the attachments on the ground so that cylinders are not holding weight).
If your equipment lacks an external pressure release, the typical method involves:
Shut off the machine’s engine and remove power.
Move the hydraulic control levers or joystick through all positions to bleed pressure. (This opens the valves so any trapped pressure can flow back into the machine’s reservoir.)
On skid steers, disengage the parking brake and attempt to wiggle the attachment to consume any residual energy in the lines.
Caution: Keep your hands and face away from couplers when doing this, and wear gloves. If the coupler was under pressure, a small amount of oil might eject as you disconnect.
Following this process will usually allow an easy reconnection later. However, pressure can build back up. If the detached implement sits and heats in the sun or is jostled (e.g., a heavy attachment rolling slightly, compressing a cylinder), the fluid can become pressurized again. Thus, even diligent operators may occasionally face a pressurized line despite proper disconnect procedures.
Bottom line: Always attempt to relieve pressure first, but be prepared with a better solution for when you must connect with residual pressure present.
Use Connect-Under-Pressure Hydraulic Couplers for Effortless Quick Connection
The more robust and time-saving solution is to install quick couplers designed for connection under pressure from the start. Rather than manually bleeding lines each time, these couplers integrate special mechanisms (valves or thread designs) that allow coupling even when one or both sides arepressurized. In other words, the coupler itself takes care of pressure relief during the connection process, without spillage.
Types of Connect-Under-Pressure (CUP) Technologies
Several CUP approaches are used across mobile and industrial hydraulic systems. Each addresses residual pressure differently and is suited for specific equipment setups.
1. Flat-Face Couplers with Internal Pressure Relief
These resemble standard ISO 16028 flat face couplers, but incorporate internal relief mechanisms that allow the male and female halves to equalize pressure during connection.
Useful when:
Only one side of the connection is typically under residual pressure (e.g., stored attachments, handheld tools).
Zero-spill performance is essential for protecting the environment, maintaining shop floors, and ensuring the cleanliness of hydraulic fluid.
These couplers use a threaded sleeve to generate mechanical advantage, enabling connection even when both sides of the circuit are pressurized. The threaded engagement also locks the coupler against vibration, preventing brinelling and premature wear.
Useful when:
Equipment experiences shock loads, vibration, or cyclical high-pressure spikes.
Attachments are swapped frequently, and hoses regularly experience trapped pressure.
3. Lever-Actuated Multi-Coupling Plates
For equipment that connects multiple hydraulic lines simultaneously, multi-coupling plates enable several circuits to connect in a single motion. Integrated cam or lever mechanisms overcome pressure resistance across all lines, even when several lines are pressurized simultaneously.
Useful when:
Operators work in extreme cold and need fast, repeatable connections.
Equipment requires 4, 6, or more lines to be connected reliably (common in municipal fleets, industrial molding lines, and specialized attachments).
4. Attachment-Mounted Pressure-Relief Manifolds
These systems mount directly on the implement and provide a dedicated manual pressure-bleed function. Before hooking up, the operator simply opens the relief valve to route trapped fluid to a low-pressure return. This allows standard flat-face couplers to reconnect without force.
Useful when:
Attachments are frequently stored in the sun or left pressurized between uses.
The operator requires a simple “on-attachment” pressure relief device without modifying the carrier machine.
Connect-under-pressure hydraulic couplers simplify hookups while improving safety, reliability, and operating uptime. Connect-under-pressure hydraulic couplers simplify hookups while also enhancing safety, reliability, and operating uptime.
When attachments or hydraulic circuits build pressure due to heat, load, or storage conditions, CUP technology allows re-connection without cracking lines or forcing couplers together.
Connect-under-pressure hydraulic couplers enhance safety, reliability, and operating uptime by making connections easier and more efficient. CUP quick couplings enable operators to reconnect attachments or hydraulic circuits even when pressure has built up due to heat, load, or storage conditions, eliminating the need to crack lines or force couplers together.
Key advantages of connect under pressure hydraulic couplers include:
Reduced Downtime
CUP connection eliminates the lost time that occurs when hoses won’t reconnect due to trapped pressure. Equipment returns to operation faster, and fleets stay productive when response time matters.
Improved Operator Safety
CUP couplers and mechanisms prevent high-pressure oil spray and reduce the physical strain of forcing connections. Technicians work more safely, with far lower risk of burns, slips, or hydraulic injection injuries.
Elimination of Risky Workarounds
No more loosening fittings, cracking lines, tapping couplers, or using pry tools to bleed pressure. CUP technology provides a built-in, controlled pressure equalization method.
Longer Component Service Life
Smooth, controlled connection reduces stress on couplers, cylinders, pumps, seals, and hose assemblies. The result is fewer leaks, fewer replacements, and lower maintenance costs throughout the equipment’s lifespan.
Faster Attachment Changeovers
Whether swapping a skid steer attachment, excavator tool, snowplow blade, or industrial mold, CUP systems shorten changeover time and support consistent, repeatable workflows.
Cleaner, More Reliable Hydraulic Systems
Flat-face CUP designs prevent oil loss on disconnect and block contaminants from entering the hydraulic circuit. Cleaner systems reduce component wear and maintain fluid integrity.
CUP couplers aren’t a convenience upgrade; they are a performance, safety, and uptime solution for any hydraulic system exposed to temperature fluctuations, heavy-duty cycles, or frequent changeovers. Stucchi offers CUP quick coupling solutions for safe connections that optimize hydraulic flow.
Stucchi Connect-Under-Pressure Hydraulic Coupler Solutions and CUP Product Highlights
Stucchi designs multiple connection systems that allow hydraulic lines to be connected safely and quickly, even when trapped or residual pressure is present. These solutions are utilized across various industries, including construction, municipal fleets, snow removal, agriculture, manufacturing, mining, oil & gas, and industrial production.
Each Stucchi product family below supports leak-free connection, pressure control, and contamination reduction, with different designs suited for specific operating demands.
The APM Series replaces standard male ISO 16028 flat-face couplers in applications where only the attachment side may retain pressure (commonly caused by thermal expansion when attachments sit idle in the sun, cold, or load shift).APM male couplers utilize a triple-valve system to relieve internal pressure, making them ideal for skid steer attachments, handheld hydraulic tools, or any situation where one side (usually the implement side) is pressurized due to thermal expansion. Check out the quick video on the product page to see how the APM internal valve works to depressurize quick couplers.
Connects by hand, even when internal pressure is present
Zero-spill flat-face design prevents oil leakage during disconnect
Ideal for: skid steer & compact loader attachments, auxiliary hydraulic tools, field service equipment
By replacing the standard male tip with an APM, you can usually connect by hand to a regular female coupler, even if the male side has residual pressure. The flat-face design means zero spill on disconnect, keeping equipment and the environment clean.
Use Case: An attachment stored in the cold and then moved into direct sunlight rapidly builds pressure. A contractor leaves a hydraulic post driver attachment in the sun; with Stucchi’s APM connect under pressure flat face hydraulic couplers, the operator can make quick and easy connections without cracking lines or forcing couplers. With APM, they can quick connect without hassle and without fluid leaks.
Learn more about ISO 16028 and how Stucchi’s flat face coupling design set the industry standard.
A-HD couplers support manual CUP without allowing any oil discharge during quick connect or disconnect, crucial in environmentally sensitive work zones and indoor industrial settings.
Maintains a clean hydraulic circuit
Protects operators from oil spray
Suitable for mobile and fixed equipment where strict leak control is required
These are suited for applications where even a few drops of oil released are unacceptable (environmentally sensitive or safety-critical). They address situations of static pressure buildup (thermal or otherwise) and protect the operator by not spraying oil during the connection process.
Thread-to-Connect | Flat-Face | High Reliability Under Pressure
Connects even when both the male and female couplers are pressurized
The threaded sleeve provides the mechanical advantage needed to overcome trapped pressure
Prevents brinelling and wear caused by vibration or pressure spikes
The VEP features a patented internal valve, allowing for connection under high pressure with no fluid loss. The heavy-duty VEPHD version is constructed from higher-grade steel with QPQ plating and is designed to withstand severe duty cycles. The VEPHDL even includes a lock ring for extra security, ensuring the threaded sleeve cannot back off under vibration.
Often used on: Excavators, demolition attachments, mulchers, quarry equipment, and industrial tools require high impulse durability.
Use case: A demolition excavator frequently switches between a hammer and a crusher attachment. Standard couplers struggled due to pressure and were damaged by vibration. Switching to VEPHD threaded couplers solved the connection issues and provided a robust, leak-free link even under hammering impulses. This Case Study highlights how Stucchi’s hydraulic solutions for demolition kept this project on task and secured future work for this contractor.
Automatic locking sleeve prevents accidental disconnect under vibration
Supports CUP on both sides
Useful for mobile hydraulics exposed to constant movement, rotation, or impact
The auto-locking feature is beneficial in applications with high vibration or pressure pulsations, as the sleeve lock prevents accidental disconnection. The VP series is a reliable CUP coupler that handles high residual pressures and is often used in heavy-duty mobile hydraulics, hydraulic mining equipment, or anywhere “both sides” may be pressurized. Learn more about Stucchi’s Leak-Free High-Pressure Quick-Release Coupling.
Designed for equipment that requires 4–10 hydraulic lines (or hydraulics + electrical) to connect simultaneously.
The single-lever action connects all lines simultaneously, even under residual pressure.
Ensures correct port matching, eliminates cross-connection errors
Reduces setup time and operator exposure in severe weather or factory environments
Ideal Applications: Injection molding die changeovers, municipal snow plow fleets, mining equipment, forestry head attachments, and industrial processing machinery.
Use Case: Multi-Coupling Plates (GR, DP Series) with FAP Couplers: These plate systems excel in applications where multiple hydraulic lines (and often electrical connectors or other fluid lines) must be connected quickly. Stucchi’s designs utilize a lever or cam-action to multiply force, connecting multiple pressurized lines in a single motion.
Each connect under-pressure hydraulic coupling on the plate has a special valve to relieve pressure as you engage the plate, so even trapped pressure doesn’t stop the connection. Industries such as drilling, mining, and injection molding utilize multi-coupling plates to reduce setup times significantly. Changing a die on an injection press can go from an hour of connecting hoses down to minutes with a multi-coupling plate. If you frequently connect bundles of hoses and find it cumbersome, a multi-coupling solution streamlines efficient, quick-connect processes.
The Saturn Block is a direct field replacement manifold mounted on attachments (e.g., mulcher heads, planers, grapples) that have multiple hoses. It allows the operator to turn a pressure relief manifold, routing all lines to a low-pressure return line, to bleed pressure before connection.
Turn the relief knob → pressure vents safely to return line
Enables easy hookup to any standard ISO flat-face coupler
Best for attachments that frequently sit in temperature swings (mulchers, planers, grapples, cold-stored snow attachments)
Once the pressure is bled, standard flat-face couplers on the block can be easily connected to the machine. Saturn Blocks are available in models designed to handle 3-line or 5-line setups (typically 2 or 4 high-pressure lines plus 1 case drain line) and are sized to accommodate standard flow rates. Stucchi also offers the Saturn Block HD, designed for heavy-duty flow CUP coupling technology.
Use case:A skid steer forestry mulcher has two high-pressure feeds and a case drain. The operator was experiencing difficulties with every hookup due to residual pressure, resulting in oil squirts and connection issues. Installing a Saturn Block on the mulcher allows him to twist the relief knob to depressurize the head before connecting, eliminating struggles and mess, and eliminating the need to climb in and out of the cab multiple times.
This Case Study highlights how Stucchi’s Saturn Block HD, combined with VEP heavy-duty couplers, improved performance and reduced cost for this mulching operator.
Application / Stucchi CUP Product Matrix
Attachment / Machine Type
Pressure Issue
Recommended Stucchi Solution
Skid Steer Attachments
Thermal expansion on the attachment side
APM
Loader/Excavator with Pressure on Both Sides
Full CUP needed
VEP / VP
Forestry / Demolition / High Impact
Vibration, impulse pressure
VEPHD
Multi-Line Snow Plow or Molding Press
Multiple hoses to connect
GR / DP Plates
Any Attachment Stored in Cold/Heat
Pressure trapped in hoses
Saturn Block
Stucchi’s connect under pressure hydraulic couplers underpin many of the above solutions. For example, the triple-valve system in the APM and the design of the VEP couplers are part of this CUP innovation. These features automate pressure relief and make hydraulic connections “plug-and-play” even in harsh, pressurized conditions.
Stucchi offers a host of auxiliary hydraulic kits for excavators, mini-excavators, skid steer equipment, track loaders, and other mobile equipment. We offer specialized hydraulic solutions for brand equipment with brand-compatible auxiliary hydraulic solutions. Contact one of our friendly hydraulic specialists to discover the solution that protects your equipment and ensures safety while optimizing your process.
Selecting CUP Couplers: Pressure Ratings & System Performance Requirements
The performance of a connect-under-pressure hydraulic coupler is only effective when the coupler is correctly matched to the hydraulic system. To specify the right solution, three core considerations matter: working pressure, burst pressure, and pressure drop. The following guidance helps clarify what each means and why it affects connection reliability in real-world use.
Working Pressure vs. Burst Pressure — What’s the Difference?
Every hydraulic coupler is rated for:
Rating
Definition
Practical Meaning
Working Pressure
The maximum continuous pressure the coupler can safely handle during regular operation
Must exceed the system’s maximum load and duty cycle
Burst Pressure
The point at which the component will mechanically fail
Typically ~4x the working pressure for a safety margin
Why do coupler pressure ratings matter?
Hydraulic pressure isn’t static; spikes occur during load changes, direction shifts, and actuator reversals. Couplers must handle not only average pressures but also short-duration surges.
Many manufacturers publish three different ratings:
Female half alone
Male half alone
Connected pair (both halves mated)
This matters because geometry and valve support differ between halves.
If you’ve ever seen a coupler that theoretically meets system pressure but still wears out prematurely, this is often the reason.
Yes, always. Hydraulic circuits routinely experience transient spikes beyond the average operating pressure. These spikes are common in:
Forestry and land-clearing attachments
Mining or demolition hammers
Snow and ice fleets operating in uneven terrain
Rapid cycling actuators in industrial presses
A coupler that is rated just barely above system pressure can:
Deform seals
Brinell valve surfaces
Cause connection difficulty
Lead to internal leakage or valve hang-up
In practice, know the maximum pressure your system actually experiences, not just the nominal specification on the nameplate for reliable connect under pressure solutions.
Pressure Drop & Flow: Why It Affects CUP Performance
Pressure drop is often overlooked because it’s not a connection problem until it becomes one. If a coupler restricts flow, the system must work harder to maintain performance. This can lead to:
Increased fluid temperature
Greater thermal expansion inside the hydraulic lines
More residual pressure is trapped when the machine shuts down
Harder reconnections and slower attachment swaps
Many operators notice this first as “the attachment feels sluggish,” or “it was working fine this morning, but now the lines are hard to connect.”
If the flow capacity is too low, the coupler can cause the very residual pressure problem it is meant to solve. If the pressure rating is too low, the coupler will connect, but it will not last.
Connect-under-pressure technology solves how you connect. Correct ratings and flow sizing determine how reliably that connection performs over time.
Check Stucchi’s Coupler Specifications table for product coupler sizes and port threads. Specific coupler information, including coupler pressure drop, maximum operating, and residual pressure ratings, is listed on each product’s respective page.
Q: Do you have a solution to quick-connect hydraulic tools and attachments under residual pressure?
Yes. Connect-under-pressure quick couplers are specifically designed for situations where pressure remains trapped in the attachment side. They equalize pressure internally, allowing a smooth connection by hand without bleeding lines or releasing fluid. → Read more
Q: I need a quick coupler that holds up under severe pressure impulses and hose rotation in heavy-duty work. What should I use?
For high-impact applications (e.g., breakers, drilling attachments, forestry heads), use thread-to-connect couplers engineered to resist vibration and shock loading. These maintain a secure seal where standard push-to-connect couplers cannot. → Read more
Q: Our right-of-way mowing equipment couplers are hard to connect and leak on disconnect. How can we fix this?
Switching to flat-face, connect-under-pressure couplers helps eliminate fluid drips and allows operators to connect attachments easily, even when the implement side is pressurized. This upgrade enhances reliability and prevents contaminants from entering the hydraulic system. → Read more
Q: Do you have a quick coupler that can connect easily when both sides are under pressure?
Yes. Thread-to-connect flat-face couplers provide the mechanical advantage to overcome pressure on both halves of a circuit and connect safely without external bleeding or tools. → Read more:
Q: We are an equipment manufacturer and would like to specify connect-under-pressure couplers. Where should we start?
Manufacturers commonly standardize on connect-under-pressure male couplers for the attachment side, ensuring field compatibility and reducing support issues. Consultation helps determine the correct series based on operating pressure, flow, and duty cycle. → Read more
Q: We continually struggle to connect under pressure, and it slows down our operation. How do we fix this?
Residual pressure is predictable and solvable. Upgrading to CUP couplers or adding a pressure-relief block removes delays, reduces operator fatigue, and prevents damage to seals and tips caused by forcing connections. → Read more
Q: Does the Saturn Block include an integrated pressure relief valve? How is it used?
Yes. The block features a manual relief mechanism that vents trapped pressure from all lines simultaneously, allowing for easy reconnection. The operation takes only a few seconds and is glove-friendly. → Read more
Connect Under Pressure Hydraulic Solutions
Residual pressure will always be part of hydraulic systems, but it should never hinder your operation. With the right connect-under-pressure solutions, equipment stays productive, changeovers become faster, and operators work safely, without force-fitting, bleeding lines, or dealing with hydraulic spray. Stucchi provides engineered couplers and connection systems that make clean, controlled connections possible in the field, on the jobsite, or on the production floor. Upgrading to CUP technology ensures consistent performance, reduced downtime, and a safer working environment across all equipment.
Stucchi’s hydraulic specialists design and engineer hydraulic connection solutions that maintain safety, reliability, and performance in demanding environments. We provide leak-free, connect-under-pressure flat-face couplers, threaded CUP assemblies, and multi-connection systems designed to improve productivity and protect your equipment. Contact us today to learn more about pressurized connection solutions featuring Connect Under Pressure hydraulic couplers.
Scott Rolston
Scott Rolston is President of Stucchi, Inc., a subsidiary of Stucchi SPA. He has devoted 28 years to the fluid power industry in sales, management, and leadership roles within the industry. For the past 20 years he has been with Stucchi, Inc. beginning with it’s organic start-up to its current market leading position within the flat face coupler category. As part of the leadership team he is responsible for the strategy, execution, and delivery of solutions that provide value to multiple segments of the marketplace.
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