All About Safety Valves!
Protecting operators and their machines
All About Safety Valves!
Protecting operators and their machines
It is of vital importance that any industrial automation process is considered to provide a safe working environment for its operators and those around it.
What are Safety Valves?
Safety valves are fail-safe devices designed to protect workers and machines.
There are many, many different types of safety valves, that are suitable for different applications and requirements. In addition, certain safety criteria and national standards need to be met.
Why are Safety Valves necessary?
Compressed air is an extremely versatile and safe medium but if used incorrectly, or in the event of a failure, it can also provide a major hazard to personal safety.
When an emergency appears, the operator needs to know that machine elements are at least under controlled conditions. This is where a safety valve comes in. In many cases, a safety valve will immediately exhaust the air from a system to prevent any major component failure that may lead to damage, injury to operators, or loss of life.
Of primary importance here is the fast, effective evacuation of the air supply and the ability to keep any maintenance operatives safe during remedial work under conditions known in industry as “LOTO” – “Lock out tag out”.
What happens next?
Any such situation can then be investigated and corrected safely prior to a re-start. Once the required corrections have been made, and extensive safety checks have been completed, the system can operate again using a soft-start safety valve.
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SCVA Cross Monitored Safety Valve
In situations requiring a complex machine system to be rendered safe during an emergency, then a dual cross monitored dump valve is essential. The SCVA is a pneumatically monitored valve eliminating the need for further electronic systems in order to meet the requirements of DIN EN
ISO13849-1 “e Cat.4” or similar.
Downstream air is exhausted in the shortest possible time due to the very high reverse flow (up to 30,000 l/min).
- Four port sizes in both BSP and NPT thread forms
- Requires only 50 micron filtration for cost effective operation
- Supplied complete with highly effective exhaust silencer
- Extremely long service life even in high frequency switching application – Excellent B10 values
SCSQ10 Cross Monitored Safety Valve with Integrated Soft Start
In applications requiring a controlled re-start of the air supply, the SCSQ included a variable soft start function. This can be adjusted to suit the downstream volume and required fill rate.
Like the SCVA, the SCSQ is pneumatically monitored to meet the requirements of current safety legislation and requires no additional electronics. Performance level e Cat. 4
- Incorporates a glandless spool for extremely long life expectancy, giving best in class B10 values
- Can be mounted as part of a control system or connected to existing air preparation units via integral adaptors
- Supplies complete with highly effective exhaust silences.
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