Gas flow responsive signal output means
First Claim
1. Signal output means responsive to gas flow, comprising a gas conduit having first and second pressure-datum valves arranged in downstream order and forming a chamber therebetween, the second pressure-datum valve being arranged to open at a lower pressure difference than is required for opening the first pressure-datum valve;
- and a flueric amplifier having a power jet port connected with the gas conduit on the upstream side of the first pressure-datum valve, opposed control pressure ports connected respectively with the chamber in the gas conduit between the first and second pressure-datum valves and with the gas conduit downstream of the second pressure-datum valve, and a vent port also connected to the gas conduit downstream of the second pressure-datum valve.
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Accused Products
Abstract
Signal output means (11) responsive to gas flow and particularly suited for use in gas flow indicator apparatus (10), has first and second pressure-datum valves (24, 25) arranged in downstream order in a gas conduit (16), the second pressure-datum valve (25) being arranged to open at a lower pressure difference than the first pressure-datum valve (24). A flueric amplifier (15) has a power jet port (28) connected to the gas conduit (16) on the upstream side of the first pressure-datum valve (24), opposed control pressure ports (26, 27) connected respectively to a chamber (22) formed between the first and second pressure-datum valves (24, 25) and to the gas conduit (16) downstream of the second pressure-datum valve (25), and a vent port (30) also connected to the gas conduit (16) downstream of the second pressure-datum valve (25). A pressure signal output by the flueric amplifier (15) in response to gas flow through the conduit (16) may be used to trigger a visual or audio warning device (14).
21 Citations
8 Claims
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1. Signal output means responsive to gas flow, comprising a gas conduit having first and second pressure-datum valves arranged in downstream order and forming a chamber therebetween, the second pressure-datum valve being arranged to open at a lower pressure difference than is required for opening the first pressure-datum valve;
- and a flueric amplifier having a power jet port connected with the gas conduit on the upstream side of the first pressure-datum valve, opposed control pressure ports connected respectively with the chamber in the gas conduit between the first and second pressure-datum valves and with the gas conduit downstream of the second pressure-datum valve, and a vent port also connected to the gas conduit downstream of the second pressure-datum valve.
- View Dependent Claims (2)
- 3. Gas flow indicator apparatus comprising a manifold having first and second pressure-datum valves arranged in downstream order and forming a chamber therebetween, the second pressure-datum valve being arranged to open at a lower pressure difference than is required for opening the first pressure-datum valve, a flueric amplifier having a power jet port connected with the manifold on the upstream side of the first pressure-datum valve, opposed control pressure ports respectively connected with the manifold chamber between the first and second pressure-datum valves and with the manifold downstream of the second pressure-datum valve, a vent port also connected with the manifold downstream of the second pressure-datum valve, and output pressure signal ports connected to a pressure responsive switch having electrical connection with an indicator device.
Specification