Safe control of power is not just limited to electrical systems.

Fluid powered machinery needs to be designed to the same requirements.

For the highest levels of risk, pneumatic and hydraulic systems require the same dual channel architecture and high diagnostic coverage as an electrical system would to achieve functional safety up to Category 4, SIL 3 or PLe.

What can go wrong with hydraulics and pneumatics?

Fluid power through hydraulics and pneumatics is a reliable and highly accurate method to apply, move and remove loads. With all systems, a level of risk is presented as fluid power holds a load in the transition between motions; the primary motion to apply the load and the secondary motion to remove that load. 

If hydraulic and pneumatic pressure is lost during this transition, failure modes can result in unexpected and unpredictable motion and if operators are nearby, serious injury.

The most common causes of failure in pneumatic and hydraulic systems are:

• Hydraulic fluid or internal wear generated contamination
• General abrasion
• Heat aging
• Moisture and condensation
• Poor lubrication

How can unpredictable and unexpected motion be prevented with safety valve technology?










Benefits of our Fortress solution

To meet Category 4, ISO 13849-1 states that the safety related parts of the control system (SRP/CS) then change SRP to SRP/CS shall be designed such that a single fault in any SRP does not lead to a loss of safety function…

ISO 4413 & 4414 detail how functional safety is the advised method to mitigate risks associated with fluid power processes. Whilst fluid power has been a reliable and powerful method to provide motion in industrial processes, when things go wrong, they can be unpredictable.

Fortress Fluidsentry offers a range of market-leading safe pneumatic and hydraulic isolation products designed for Category 4 Performance Level e applications.

The Fortress Fluidsentry range is designed with redundancy in mind for every component.

ANSI B11.26 states how pneumatic and hydraulic systems shall be designed such that any failure to a system will result in that system moving to a ‘safe state’.

The fluid power for hydraulic and pneumatic energy often comes from one supply line.

Isolating the entire supply unnecessarily can be expensive and a huge inefficiency to productivity. Safety valves can be used to zone your supply lines via a control system to vent and exhaust downstream pressure to the local area surrounding the hazard.

Localised isolation maximises productivity whilst one zone is ‘out of action’ to minimise the effect of downtime.

Designed with redundancy on every component.

Fortress Fluidsentry products use patented technology to ensure pressure is safely exhausted and vented through redundant means in cases where an exhaust channel is blocked.

The manifold within all Cat. 4 PLe valves have a series ported cross-linked manifolds to provide the additional surety that your are in the safest hands.

Benefits of our Fortress solution

Explore our fluid safety options

Watch Fluidsentry in action

Fluidsentry systems can be retrofitted into existing Hydraulic and Pneumatic based systems to enable the highest level of safety function to Cat. 4, SIL 3, PLe.

Watch our quick animation to learn more about the dangers of fluid power and how fluid power safety can allow you to rest easy.

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Easily link safe isolation systems to networked controls

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for your machinery safety applications.