Abstract: A vacuum actuated valve assembly includes a valve body housing a butterfly valve configured to be connected to a vapor containing fluid source having a static pressure; a linear rack and pinion assembly; an externally exhausted pneumatic actuator having a body with a first end and a second end, an internal piston, an external piston rod shaft having a third end away from the body of the actuator, and a spring located over the external piston rod shaft and fitted in between the second end and a stopper near the third end. The externally exhausted pneumatic actuator is configured to be operated by the static pressure of the vapor in the fluid source. The rack and pinion assembly is coupled to the third end of the external piston rod shaft, and configured to operate the butterfly valve.

Abstract: A flexible bag assembly includes a body which has a first end and a second end; a closure system for opening or closing of the body between the first end and the second end along a seam; and at least one tubular section on at least one end of the body. The tubular section is configured to wrap around a pipe portion connected to a container. Systems and methods of using such flexible bag assembly for environmental process containment are disclosed herein.