A gate valve bonnet closure which can be quickly and safely serviced with common tools. The valve bonnet fits within the valve body. Lock elements in contact with the bonnet fit into an annular groove in the body. The lock elements are of a size and configuration so as to allow location within the groove for substantially the full extent of the annular groove or, spaces between adjacent lock elements can be filled by retaining plates preferably bolted to the bonnet to prevent movement of the lock elements. Pressure sensing vents or bolts are preferably used to prevent opening of the valve when there is pressure in the valve body. The pressure sensing bolts holding retaining plates in place include a hollow bore which is sealed when the bolt is fully seated but is exposed when the bolt is rotated a small number of times to indicate and bleed off pressure within the valve. A seal located in a between the valve body and the bonnet is accessible upon removal of the lock elements to allow servicing or replacement of the seal without removal of the valve gate and bonnet. A fitting to inject sealing material is included to seal minor leaks if necessary.
