A-1, B-1, and C-1 equalizing subs equalize differential pressures across slickline-retrievable subsurface controls before retrieving the controls from the tubing string. These subs all feature compact construction and simple design, differentiated by the size of the internal bore. All are designed for sweet to moderately corrosive environments.
These equalizing subs have a spring-loaded dart that protrudes into the bore of the sub. When a prong attached to the pulling tool is run into the sub, the dart is pushed off its seat. This permits pressures to equalize across the assembly before unsetting the lock.
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