Abstract: A retrieving device for the assembly and disassembly of probes into process pipes and tanks comprising a hydraulically activated cylinder attached to a nipple and ball valve mounted on the wall of a pipe or tank and the cylinder may be operated by applying a suitable pump. A pair of pistons are inserted within the cylinder and these pistons are arranged in telescoping fashion. A piston rod attached to one of the pistons is constructed so that it can securely attach to a probe or other device. a fluid pressurizing means which includes a pair of hydraulic tubes are attached to the upper and lower ends of the hydraulic cylinder so that hydraulic pressure can be applied to extend the pistons and insert the probe or retract the pistons and remove the probe. The ball valve is closed and the retrieving device can then be removed from the valve to service and replace the probe. When the probe is inserted within the nipple a sealing device seals the probe against fluid leakage from the pipe or tank.

Abstract: A device for inserting or removing a plug and probe (13) which is subjected to high pressure in a process pipe or a tank. A nipple (12) is attached to the pipe (11) or the tank. The nipple can be secured by a cover (14). After removing the cover a ball valve (15) can be attached to the nipple. A hydraulic cylinder (16) is then externally connected to the ball valve. A piston in the cylinder can be connected to the probe through the ball valve. This piston can be used to pull the plug out or push it in through the ball valve. Once the plug has passed through the ball valve, the plug can be removed from the cylinder and replaced, if necessary.