Process interface valve assembly

摘要

A valve assembly includes a valve body having a fluid access passage extending from a process fluid port to an access port, a block valve disposed in the fluid access passage and movable between open and closed conditions, an access blocking device disposed in the fluid access passage between the access port and the block valve, and a valve interlock arrangement. The access blocking device is movable from an access blocking condition in which access to the block valve through the access port is blocked, to an access permitting condition in which access to the block valve through the access port is permitted. The valve interlock arrangement is configured such that the block valve is prevented from being moved to the closed condition when the access blocking device is in the access permitting condition.

主权项

1. A valve assembly comprising: a valve body having a process fluid access passage extending through the valve body from a process fluid port to an access port; a block valve disposed in the fluid access passage, said block valve being operable between open and closed conditions; and an access blocking device disposed in the process fluid access passage between the access port and the block valve, the access blocking device being moveable from an access blocking condition in which access to the block valve through the access port is blocked, to an access permitting condition in which access to the block valve through the access port is permitted;
wherein the access blocking device includes an internal passage comprising a central cylindrical bore and first and second notches intersecting bore edges at opposite ends of the internal passage, wherein the first and second notches provide an increased contact area between the access blocking device and a probe inserted through the central cylindrical bore.