Abstract: A temperature verification device employs a coiled bimetallic strip having its temperature responsive, rotatable outer end engaged with an indicator flag which is connected with a finger-like projection spaced outwardly from the indicator flag. A stop member is provided in the path of the distal end of the finger-like member and is adapted to engage the distal end when the flag member is moved in one direction, for example, clockwise. Movement of the flag member in the opposite direction can be achieved because the resilient finger-like member will slide past the stop member. All of the structure is confined in a casing having an opening through which the flag indicator may be observed under certain conditions. The stop member can be positioned at any selected location about the periphery of the casing to function as a holding means for the flag indicator at a preselected temperature threshold.

Abstract: A valve assembly for packing removal includes a valve body having a bonnet and yoke attached to the body and a chamber extending longitudinally through the bonnet. A stem secured in the yoke extends through the bonnet chamber. Valve packing means are enclosed in the bonnet around the stem and secured by a packing gland connected to the top of the bonnet. An annular drive bushing is mounted in the bonnet chamber around the stem below the bottom of the packing means. In actuation of the drive bushing, mechanical or fluid drive means engage the bottom of the drive bushing, with the packing gland removed from the bonnet, to displace the drive bushing upwardly through the bonnet chamber for removal of the packing means therefrom.

Abstract: Tamper proof apparatus for verification that a critical temperature has been reached or exceeded includes a permanently sealed casing and cap containing a thermal element connected to a rotatable cam having a temperature indicator extending outwardly therefrom adapted to rest under a transparent window in the cap when critical temperature has been reached. Maximum and minimum temperature stops on the cap prevent movement of the indicator beyond preselected positions. An opening through the cap engages a removable shipping pin cooperating with either the maximum or minimum temperature stop to prevent movement of the indicator during shipment or storage. A locking spring connected to the cap traverses the lateral surface of the cam until the spring engages a shoulder formed in the cam. The shoulder and spring have, respectively, a first spur and a second spur that engage in permanently locked position when a critical temperature has been reached.