Safety of machinery standard AS 4024.2006 demands use of safety rated pneumatic valve or monitored pneumatic valve for fail safe pneumatic energy isolation. XSZ range use integral air logic incorporated into the pilot supply air system. Therefore no moving parts exist. Both main valve poppets are monitored on each cycle by an air chamber and orifice. This design feature eliminates the need for electrical monitoring of the valve. The XSZ Valves have been assessed as conforming to AS 4024.2006 and may be used in applications to the level of Risk Category 4.