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To help fetch subsurface devices that have fishing necks.
The RB2 Standing Valve consists of nine components:
2. Spring Sleeve
4. Core Spring
5. Shear Pin Cover
7. Dog Spring
8. Dog Washer
Used when there is a need to jar up or shear off of a subsurface tool and/or fish when a jar down tool is not desired. The core may be easily changed out in the field to allow for deeper orshallower reach depending on application.
Care should be taken to inspect the dogs, skirt, and fishneck for damage such as metal . fatigue, cracking , or deformity of the metal.