Download - Product for Safe System From Norgren
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Products for Safe Systems
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Legislation Problems
are solved with
a helping handand productsfor safesystems
Factory
InspectorateRisk
Assessment
MachineryDirective
EN Standards
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Emergency stop valves EN 418 4.1.11 & 4.1.12
3/2 normally open valve
Large easy to operate redbutton
Once pushed the valve ismechanically latched on
Reset method options:
twist button
unlatch with a key
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Two hand control EN 574 Two hand control
devices
Single fault tolerant Buttons must be pushed
in synchronisation
Output signal on only
while both buttons arepushed
If either button is releasedthe signal is lost so the
system must fail safe
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EN 983
Switching-on hazard
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Switching-on hazard Start from exhausted
system and cylinder at
mid stroke When air is turned on
there is no back pressureto control cylinder speed
Piston will slam to theend of stroke
Click the illustration to start and stop animation
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Soft start valve Pressure is built up
gradually
Pre-exhausted cylinderswill move gently toposition
Snap point is reached
Full flow and pressure
Soft start valve output
10 20 30 40 50 60 70 80 90 1000
0
2
4
6
8
10
12
14
Time (seconds)
bar
snap point
10
1
2
3
12
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Hazard solved System pressure is
re-applied
When the soft startvalve is turned on,flow is restricted sothat pressure builds
up gradually The cylinder will move
to the end of itsstroke gently
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EN 983
Switching off hazard
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Switching off hazard Emergency stop valve will
dump pneumatic power
Piston will outstroke dueto its load
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Passive piston rod lock Use a cylinder fitted with
a passive piston rod lock
Pressure normallyapplied to to hold the lockoff
When pressure is
dumped the lock springson to prevent movementunder load
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Hazard solved Emergency stop valve
dumps air
Lock clamps the pistonrod
The load is supported
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Rodless cylinder with brake Rodless cylinder with a
passive brake to hold the
carriage in position
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Blocking fittings Blocking fittings lock air
into a cylinder if the main
air supply fails Fitted directly to the
cylinder ports
Pressure applied to the
signal port holds thevalve open
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Blocking fittings When the supply air is
removed the two blocking
fittings spring closed The cylinder will stop
A load will be held inbalance
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Further Safety Products for EN 983
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Pressure relief valves EN 983 5.1.2
Protection against over
pressurisation Air relieved or dumped
Adjustable relief pressure
Exhaust can be piped
away to prevent a hazard
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Tamper-resistant kits EN 983 5.3.5.2
For pressure regulators
and lubricators Tamper resistant clamps
to prevent useradjustment
Can be wired and sealedor padlocked
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Locking ball valve EN 983
Shut off ball valve
Isolates upstream supplypressure
Exhaust feature vents thedownstream pressure
Can be locked in theclosed position with apadlock
Cannot be locked in the
open position
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Silencers EN 983
Exhaust port silencers
Heavy duty robustconstruction to withstandknocks and abrasion
Efficient noise reduction
Wide range of port sizes External and internal
threads
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Coalescing exhaust silencer EN 983 5.1.9.
All exhausts from a
system can be piped toone or more of theseunits
The sub-micron element
removes oil mist andsolid particles
Continuous draining of oilto collection bowl
Dramatically reducesexhaust noise
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Other Safety Products
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Pre-set pressure regulators Pressure reliably held and
not user adjustable
Supply to blow guns andbreathing air sets aretypical examples
The miniature regulator
shown is factory pre-setand sealed in a tamperresistant housing
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Air fuse An air fuse is fitted at the
supply end of a hose
Will detect a severedhose or failed joint
Air flow is automaticallyclosed down to prevent
the hose from whippingabout
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Blow guns Limited width central air
jet
Wide surrounding jet tominimise particle blowback
Vent holes to spill air if
the nozzle is placed tooclose to the skin or otherobject
Supply only with cleandry un-lubricated air
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Monitored dump valve Monitored Dump Valve
(MDV) is a 3/2 solenoid
operated valve Used to dump air for
safety critical systems
Incorporates a switch to
monitor the position ofthe valve spool
Monitoring can beperformed by a Pilz safetyrelay
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Monitored dump valve Door closed, air supply on
Door open, air dumped
If the spool of one of thedump valves jams on, theair will be dumped by theother
The faulty valve will notremake the monitoring loop
The safety relay will notenergised either valve againuntil the faulty valve isreplaced
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End