| 摘要 |
The present invention relates to a measuring instrument installation on a process circuit capable of being subjected to a medium under high pressure, with a locking element between the measuring instrument and the process circuit. According to the invention the locking element is a ball valve 18 provided with a valve body as the ball housing and with a process circuit connection 2 and a measuring instrument connection 3. In addition a ball 7 which can be rotated back and forth between a pass position 6 and a lock position is installed in the ball housing, said ball being provided with a passage bore 8 that can be positioned in the pass position. Furthermore two ball seats 12, 13 pointing respectively in the direction of the process circuit connection 2 and of the measuring instrument connection 3 are provided, each being provided with a sliding sleeve 14, 15 spring-loaded and capable of sliding in the direction of the ball 7. Furthermore each sliding sleeve 14, 15 is connected to a sealing packing 19, 20 pressed in a ring-shaped manner against the ball 7, so that a ball space 25 which is not directly sealed off from the process circuit connection 2 and the measuring instrument connection 3 is constituted between the sealing packings 19, 20, whereby the ball housing 1 is provided in the area of the previously mentioned ball space 25 with a relief/bleed connection 26 with a connected actuated relief/bleed valve 27.
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