초록 ▼

A normally closed valve system for sealing off low pressure gas flow through a pipe. The valve system 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-saf

A normally closed valve system for sealing off low pressure gas flow through a pipe. The valve system 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 ▼

A fail-safe bypass monitor for measuring the volumetric flow rate of normally low pressure air inleakage evacuated from a steam turbine condenser and exhausted through a segment of vent pipe, comprising: (a) bypass flowmeter means, positioned between the condenser and the vent pipe segment to receiv

A fail-safe bypass monitor for measuring the volumetric flow rate of normally low pressure air inleakage evacuated from a steam turbine condenser and exhausted through a segment of vent pipe, comprising: (a) bypass flowmeter means, positioned between the condenser and the vent pipe segment to receive air from the condenser and to exhaust air through the vent pipe segment, for providing a first signal indicative of volumetric air flow rate from the condenser; (b) a tube having a first end for receiving air flow from the condenser and a second end connected to the vent pipe segment; (c) an inflatable bladder positioned within said tube for sealing off relatively low pressure air flow through the vent pipe segment to divert the air flow to said flowmeter means and for permitting relatively high pressure air flow through the vent pipe segment when air pressure between the condenser and said inflatable bladder exceeds a preselected value; (d) means for providing a second signal when air pressure between the condenser and said inflatable bladder exceeds the preselected value; (e) mechanical means for inflating and deflating said bladder; and (f) control means responsive to the first and second signals for controlling said mechanical means.