Patent ID: 7036441

Claim:
A safety system for a mobile anhydrous ammonia fertilizer system having a nurse tank, an ammonia applicator, and a flexible hose releasably coupled therebetween, the applicator being configured for connection to a tractor for pulling the applicator and nurse tank through a field, the safety system comprising: a) a shutoff valve connected between the nurse tank and the hose, the shutoff valve being operable between open and closed positions to allow and prevent flow from the nurse tank to the applicator, respectively; b) a release lever located on the tractor and movable between first and second positions associate with said shutoff valve open and closed positions; c) a release cable connected between the shutoff valve and the release lever to enable closing of the shutoff valve with the release lever; and d) a shear section provided in the release cable in-line between the shutoff valve and the release lever for separation of the cable in the event of separation in the fertilizer system.