초록 ▼

A normally closed valve system for sealing off low pressure gas flow through a pipe. The valve comprises an inflatable bladder which blocks relatively low pressure flow through the pipe and permits relatively high pressure flow through the pipe. In one form, the invention comprises a fail-safe bypas

A normally closed valve system for sealing off low pressure gas flow through a pipe. The valve comprises an inflatable bladder which blocks relatively low pressure flow through the pipe and permits relatively high pressure flow through the pipe. In one form, the invention comprises a fail-safe bypass monitor and method for measuring air inleakage in a steam turbine. The monitor selectably bypasses low volumetric flow rates from a pipe for measurement and admits flow through the pipe whenever the flow rate exceeds a predetermined value.

대표청구항 ▼

Method for sealing off a normally low pressure gas flow through a segment of pipe with an inflatable bladder, the bladder being selectably connected in fluid communication with either a gas source or a vent by means of a two position valve, the method comprising the steps of: (a) securing the bladde

Method for sealing off a normally low pressure gas flow through a segment of pipe with an inflatable bladder, the bladder being selectably connected in fluid communication with either a gas source or a vent by means of a two position valve, the method comprising the steps of: (a) securing the bladder along the interior of a tube; (b) positioning a first end of the tube for receiving gas flow; (c) connecting a second end of the tube to the pipe segment; (d) positioning the valve to place the bladder in fluid communication with the gas source; (e) inflating the bladder to a predetermined pressure which blocks relatively low pressure gas flow through the tube to the pipe segment and which permits relatively high pressure gas flow through the pipe segment; and (f) collapsing the bladder when gas flow pressure in the tube exceeds a preselected value.