The risk of a PST causing an unintended plant shutdown is a major reason many plant personnel dislike PST. A test intended to enable more plant ‘up’ time resulting in an un-necessary plant shutdown is definitely not desirable. For this reason, the patented TripGuard System based on the Camtorc Actuator was developed. Using the unique design of the Camtorc Actuator, TripGuard enables a PST to be performed without any risk of an unintended valve closure occurring but also maintain full shutdown availability of the valve. Now the benefits of PST can be easily realized without any of the associated risks.