1. A gas valve comprising: a valve body defining an upper valve seat region and a lower valve seat region; a main valve disposed within the valve body, the main valve comprising an upper main plate and a lower main plate; and a control valve coaxially aligned with the main valve, the control valve comprising an upper control plate and a lower control plate; wherein the main valve and the control valve are independently actuatable.
2. The gas valve of claim 1, wherein the upper valve seat region is configured to accommodate the upper main plate and the upper control plate and the lower valve seat region is configured to accommodate the lower main plate and the lower control plate.Water Control valves
3. The gas valve of claim 1, wherein the upper valve seat region comprises an upper main valve seat adapted to interact with the upper main plate and an upper control valve seat adapted to interact with the upper control plate.
4. The gas valve of claim 1, wherein the lower valve seat region comprises a lower main valve seat adapted to interact with the lower main plate and a lower control valve scat adapted to interact with the lower control plate.
5.Water Power Control Valves The gas valve of claim 1, wherein the main valve is adapted to override and close the control valve.
6. The gas valve of claim 1, wherein the main valve provides shut-off functionality.
7. The gas valve of claim 1, wherein the control valve provides flow control functionality.
8. A gas valve comprising: a valve body defining an upper valve seat region and a lower valve seat region; a main valve disposed within the valve body, the main valve comprising an upper main plate, a lower main plate, and a hollow main valve shaft; API CAST STEEL VALVESand a control valve coaxially aligned with the main valve, the control valve comprising an upper control plate, a lower control plate, and a control valve shaft slidingly disposed within the hollow main valve shaft.
9. The gas valve of claim 8, wherein the control valve comprises a sealing ring disposed on the lower control plate that interacts with the main valve to stop gas flow through the main valve hollow shaft.
10. A balanced port gas valve comprising: a valve body; a dual shut-off valve disposed within the valve body comprising a main shaft and a main plunger secured to the main shaft, the main plunger providing first and second main plates adapted to interact with the valve body to permit or stop gas flow; and a dual control valve coaxially aligned with the dual shut-off valve comprising a control shaft and first and second control plates secured to the control shaft, the first and second control plates adapted to interact with the valve body to adjust gas flow; wherein the main shaft and the control shaft are actuated from opposing directions.

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2011-11-29

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