A new and improved subsurface safety valve which is inserted into well tubing without requiring removal of the tubing,Safety Valves and which replaces worn, deteriorated and fully or partially inoperative safety valves in the well tubing to prevent blow-outs in wells. The replacement subsurface safety valve may be subsequently removed after insertion without requiring removal of the well tubing.Balance Valves In the prior art, safety valves have been mounted with well tubing to control subsurface well pressure and prevent blowouts which caused pollution of the environment, particularly on offshore wells, as well as damage to expensive equipment by explosion,MULTI-FUNCTIONAL WATER PUMP CONTROL VALVE fire and the like. Sand and other abrasive materials in the oil passing through the tubing caused wear and deterioration of the valves rendering them defective and ineffective, and necessitating replacement of the defective valves. Certain of the prior art safety valves were mounted in well tubing, requiring the well to be shut-in and the tubing removed to replace the defective valve. Removal of the well tubing was expensive and time-consuming and caused reduced production capacity due to the well being shut-in. Further, there was always a risk that the shut-in well might "sand up" or become blocked, requiring reworking of the well before production could be resumed. The present invention provides a new and improved safety valve for well tubing which is inserted into the well tubing to replace a defective safety valve and form an apparatus for preventing blow-outs. The replacement safety valve is mounted in the well tubing adjacent the defective valve and is operated to open and close in response to the controls of the defective valve permitting production in the well to continue without requiring that the well tubing string be removed. Once mounted in the tubing string, the replacement safety valve may be tested and operated in place in the well tubing, and retrieved and replaced by a new replacement valve should it become defective.

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