1. A GaN green LED drive device comprising:
a bias current output unit for outputting a pulse-like bias current having a predetermined low level value higher than a zero value; and
a peaking unit for peaking said bias current outputted from said bias current output unit to make rise of said bias current higher than a high level value and make fall of said bias current lower than said low level value to thereby obtain a peaked bias current supplied to a GaN green LED,
wherein said bias current output unit selectively sets said low level value of said bias current based on a predetermined correlation between a set acting speed of the GaN green LED and the bias current.
2. A GaN green LED drive device comprising:
a bias current output unit for outputting a pulse-like bias current having a predetermined low level value higher than a zero value; and
a peaking unit for peaking said bias current outputted from said bias current output unit to make rise of said bias current higher than a high level value and make fall of said bias current lower than said low level value to thereby obtain a peaked bias current supplied to a GaN green LED,
wherein said bias current output unit selects said low level value of said bias current to be higher as a set acting speed of said GaN green LED increases.
3. A GaN green LED drive device according to claim 1, wherein said bias current output unit outputs a pulse-like bias current having a low level value of not lower than 4 mA.
4. An optical transmission device having a GaN green LED drive device defined in claim 1.
5. A GaN green LED drive device according to claim 2, wherein said bias current output unit outputs a pulse-like bias current having a low level value of not lower than 4 mA.
6. A GaN green LED drive device according to claim 1, wherein said bias current output unit selects said low level value of said bias current to be higher as the set acting speed of said GaN green LED increases.
7. A GaN green LED drive device according to claim 2, wherein said bias current output unit selectively sets said low level value of said bias current based on a predetermined correlation between the set acting speed of the GaN green LED and the bias current.
8. A GaN green LED drive device according to claim 1, wherein said predetermined correlation between said set acting speed of the GaN green LED and the bias current is based on a fall time and a rise time of said GaN green LED.
9. A GaN green LED drive device according to claim 1, wherein said predetermined correlation between said set acting speed of the GaN green LED and the bias current is based on a fall time and not a rise time of said GaN green LED.
10. A GaN green LED drive device according to claim 1, wherein said bias current output unit outputs a pulse-like bias current having a low level value of not lower than 5 mA.
11. A GaN green LED drive device according to claim 1, wherein said bias current output unit outputs a pulse-like bias current having a low level value of not lower than 6 mA.
12. A GaN green LED drive device according to claim 1, wherein said bias current output unit outputs a pulse-like bias current having a low level value of not lower than 7 mA.
13. A GaN green LED drive device according to claim 1, wherein said bias current output unit outputs a pulse-like bias current having a low level value of not lower than 8.5 mA.
14. A GaN green LED drive device according to claim 1, wherein said bias current output unit outputs a pulse-like bias current having a low level value of not lower than 10 mA.
15. An optical transmission device having a GaN green LED drive device defined in claim 2.
16. A GaN green LED drive device comprising:
a GaN green LED;
means for outputting a pulse-like bias current having a predetermined low level value higher than a zero value; and
means for peaking said bias current outputted from said means for outputting to make rise of said bias current higher than a high level value and make fall of said bias current lower than said low level value to thereby obtain a peaked bias current supplied to the GaN green LED,
wherein said means for outputting selectively sets said low level value of a bias current based on a predetermined correlation between a set acting speed of the GaN green LED and the bias current.
17. The GaN green LED drive device according to claim 16, wherein said means for outputting selectively sets said low level value of said bias current to be higher as the set acting speed of said GaN green LED increases.
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 method of a ball valve seal replacement in a gas supply system comprising the steps of:
providing a ball valve in a gas supply system comprising:
a ball component;
a valve body defining flow passage and an interior cavity having an access opening that is independent of said flow passage and communicating with said flow passage, said access opening accepting passage of said ball component to permit installment of said half component in said flow passage to regulate flow;
said valve body defining seating ring recesses in said flow passages at both sides of said ball component;
seating rings slidably disposed in said seating ring recesses to engage said ball component to effect sealing between said flow passage and said ball component;
said seating rings including seals for effecting said sealing between said flow passage and said ball component;
closing rings engaging said scaling ring recesses to retain said seating rings;
said seating rings having flanges engaging said seating ring recesses and defining working chambers in conjunction with said seating ring recesses and said closing rings;
passages providing exterior communication with said working chambers; and
a biasing device biasing said seating rings into engagement with said ball component;
cutting off gas supply to the valve;
degassing the valve;
applying a pressurized medium to said working chambers via said passages to disengage said seating rings from said ball component permitting removal of the ball component;
removing the ball component from the interior cavity through said access opening;
removing said closing rings from said seating ring recesses and said interior cavity through said access opening;
removing said seating rings from said seating ring recesses and said interior cavity through said access opening; and
replacing said seals on said setting rings.
2. The method of claim 1 wherein said seating rings have flanges with seals engaging said seating ring recesses effecting sealing of said working chambers and said flanges define said working chambers in conjunction with said seating ring recesses and said closing rings.
3. The method of claim 2 wherein said seating rings include seals engaging said closing rings effecting sealing of said working chambers.
4. The method of claim 3 wherein said closing rings have seals effecting sealing with said valve body about said seating ring recesses.
5. The method of claim 1 wherein said seating rings include seals engaging said closing rings effecting sealing of said working chambers.
6. The method of claim 5 wherein said closing rings have seals effecting sealing with said valve body about said seating ring recesses.
7. The method of claim 6 wherein said ball valve further comprises a biasing device biasing said seating rings into engagement with said ball component.
8. The method of claim 1 wherein said closing rings have seals effecting sealing with said valve body and said seating ring recesses.
9. A ball valve comprising:
a ball component;
a valve body defining a flow passage and an interior cavity having access opening that is independent of said flow passage and communicating with said flow passage, said access opening accepting passage of said ball component to permit installment of said ball component in said flow passage to regulate flow;
said valve body defining seating ring recesses in said flow passages at both sides of said ball component;
seating rings slidably disposed in said seating ring recesses to engage said ball component to effect sealing between said flow passage and said ball component;
said seating rings including seals for effecting said sealing between said flow passage and said ball component;
closing rings engaging said sealing ring recesses to retain said sealing rings;
said seating rings having flanges engaging said seating ring recesses and defining working chambers in conjunction with said seating ring recesses and said closing rings;
said valve body defining passages providing exterior communication with said working chambers for accepting a pressurized medium to displace said seating rings apart from said ball component to permit removal thereof via said access opening; and
a biasing device biasing said seating rings into engagement with said ball component.
10. The ball valve of claim 9 wherein said seating rings have flanges with seals engaging said seating ring recesses effecting sealing of said working chambers and said flanges define said working chambers in conjunction with said seating ring recesses and said closing rings.
11. The ball valve of claim 10 wherein said seating rings include seals engaging said closing rings effecting sealing of said working chambers.
12. The ball valve of claim 11 wherein said closing rings have seals effecting sealing with said valve body about said seating ring recesses.
13. The ball valve of claim 12 wherein said seating rings include seals engaging said closing rings effecting sealing of said working chambers.
14. The ball valve of claim 9 wherein said seating rings include seals engaging said closing rings effecting sealing of said working chambers.
15. The ball valve of claim 14 wherein said closing rings have seals effecting sealing with said valve body about said seating ring recesses.
16. The ball valve of claim 15 wherein said seating rings include seals engaging said closing rings effecting sealing of said working chambers.
17. The ball valve of claim 9 wherein said closing rings have seals effecting sealing with said valve body about said seating ring recesses.
18. The ball valve of claim 17 wherein said seating rings include seals engaging said closing rings effecting sealing of said working chambers.
19. The ball valve of claim 9 wherein said seating rings include seals engaging said closing rings effecting sealing of said working chambers.