1. A system, comprising:
a data receiving arrangement receiving, from a data source, information corresponding to an airport;
a data comparing arrangement comparing the received information to noise rules; and
an alert generating arrangement generating a noise alert based on the comparison of the received information to the noise rules.
2. The system of claim 1, further comprising:
a web server distributing the noise alert.
3. The system of claim 1, further comprising:
an electronic mail application distributing the noise alert via an electronic mail.
4. The system of claim 1, wherein the noise alert is one of a flight alert and a trend alert.
5. The system of claim 4, wherein received information is flight information and the flight alert is based on the flight information.
6. The system of claim 4, wherein the received information is data for a plurality of flights and the trend alert is based on the data for the plurality of flights.
7. The system of claim 4, wherein the flight alert is generated one of before the flight takes off, while the flight is in-route and after the flight has landed.
8. The system of claim 1, further comprising:
a user interface receiving the noise rules.
9. A method, comprising:
receiving noise information corresponding to an airport;
comparing the noise information to noise rules for the airport; and
generating a noise alert based on the comparison of the noise information to the noise rules.
10. The method of claim 9, further comprising:
distributing the noise alert.
11. The method of claim 10, wherein the distributing of the noise alert is via one of a web page, an electronic mail and a phone call.
12. The method of claim 9, wherein the noise alert is one of a flight alert and a trend alert.
13. The method of claim 12, wherein the noise information is flight information and the flight alert is based on the flight information.
14. The method of claim 12, wherein the noise information is data for a plurality of flights and the trend alert is based on the data for the plurality of flights.
15. The method of claim 13, wherein the flight alert is generated one of before the flight takes off, while the flight is in-route and after the flight has landed.
16. The method of claim 9, further comprising:
receiving the noise rules.
17. The method of claim 9, wherein the noise information is received from a passive secondary surveillance radar system.
18. The method of claim 9, wherein the noise information includes one of a runway configuration, a flight schedule, and a flight path.
19. A system comprising a memory storing a set of instructions and a processor for executing the instructions, the set of instructions being operable to:
receive noise information corresponding to an airport;
compare the noise information to noise rules for the airport; and
generate a noise alert based on the comparison of the noise information to the noise rules.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A gas pressure regulating valve provided at an opening portion of a tank and configured to regulate pressure of a fuel gas filled in the tank and output the fuel gas, the gas pressure regulating valve comprising:
a housing including a valve passage connected to a primary port and a secondary port;
a valve body provided in the housing and configured to move between a closed position where the valve body closes the valve passage and an open position where the valve body opens the valve passage to adjust an opening degree of the valve passage;
a return spring configured to bias the valve body toward the closed position;
a valve body driving unit provided in the opening portion of the tank and configured to apply a driving force corresponding to an applied voltage or an applied current to valve body against the biasing of the return spring to cause the valve body to move toward the open position;
a pressure return chamber formed in the housing and connected to the secondary port;
a bearing member provided in a gap between the valve body and the housing and configured to slidingly support the valve body;
first and second sealing members respectively provided on both sides of the bearing member and configured to respectively seal both sides of the gap; and
a seal rod inserted in the valve body from a base end of the valve body so as to be movable relative to the valve body and configured to form a back pressure chamber connected to the primary port, the back pressure chamber being formed between the seal rod and the valve body, wherein:
the first sealing member receives pressure of the pressure return chamber in a direction against the driving force and causes the valve body to move toward the closed position in accordance with the received pressure;
a communication passage connected to the secondary port is formed between the seal rod and the valve body so as to be closer to a base end side of the valve body than the back pressure chamber; and
a third sealing member is provided between the communication passage and the back pressure chamber so as to seal therebetween.
2. The gas pressure regulating valve according to claim 1, wherein:
the valve body includes a first pressure receiving surface configured to receive primary pressure at the primary port toward the open position and a second pressure receiving surface configured to receive pressure of the back pressure chamber toward the closed position; and
a pressure receiving area of the first pressure receiving surface is equal to a pressure receiving area of the second pressure receiving surface.
3. The gas pressure regulating valve according to claim 1, wherein:
the valve body includes a first pressure receiving surface configured to receive primary pressure at the primary port toward the open position and a second pressure receiving surface configured to receive pressure of the back pressure chamber toward the closed position; and
a pressure receiving area of the first pressure receiving surface is smaller than a pressure receiving area of the second pressure receiving surface.
4. The gas pressure regulating valve according to claim 1 wherein:
the first sealing member is a diaphragm seal; and
the second sealing member is a low-pressure seal having low frictional resistance.
5. The gas pressure regulating valve according to claim 1, wherein the third sealing member is a high-pressure seal which has low frictional resistance and in which a difference between starting resistance and sliding resistance is small.
6. The gas pressure regulating valve according to claim 1, wherein the gas pressure regulating valve is a normally closed valve configured such that when the applied voltage or the applied current applied to the valve body driving unit is zero, the valve body is located at the closed position by the return spring.