Pilot Operated Safety Valves from the High Efficiency product group are especially suitable for applications with high pressure and offer optimal tightness right up to set pressure.  They meet all the requirements of API 526 and therewith offer 100% compatibility.  LESER offers pilot operated safety valves with rapid or proportional opening characteristics.      

The supplementary loading system for the High Efficiency product group uses external air pressure to guarantee better tightness up to set pressure. 

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link:http://www.leser.com/fileadmin/content/Download/broschueren&kataloge/Kataloge/High%20Efficiency/High_Efficiency_Extended_Catalog_EN.pdf