Claims
- 1. A valve for handling a hot fluid material, particularly, a fine particulate material such as the coal dust formed in the smelting of direct reduced iron ore, comprising:
- an upper valve portion defining an upper passageway for receiving the hot fluid material;
- a lower valve portion defining a lower passageway for expelling the hot fluid material;
- a valve closure member which is slidably positionable in a closed position to block a flow of the hot fluid material from said upper passageway to said lower passageway, and in an open position wherein the flow of the hot fluid material from said upper passageway to said lower passageway is allowed;
- said valve portions including a sleeve region which is proximate to said passageways and an outer valve region which is distal from said passageways, said sleeve region and outer valve region substantially surrounding said passageways and defining at least one annular cavity therebetween which also substantially surrounds said passageways;
- said at least one annular cavity being adapted to receive a non-fluid insulating medium such as a ceramic material which heat-insulates said valve while maintaining a temperature difference between said sleeve region and said outer valve region;
- a valve passage positioned to carry an elongated shaft having two opposite ends, one end of said shaft being attached to said valve closure member, and the other end of said shaft being adapted for securement to a means for causing said slidable positioning of said valve closure member;
- said elongated shaft including a passage formed therein for carrying a fluid for cooling said elongated shaft in such a manner that the cooling fluid is confined to said elongated shaft.
- 2. The valve of claim 1 wherein the ceramic insulating material comprises kaowool.
- 3. The valve of claim 1 further comprising:
- at least two oppositely located side walls and at least one lid closable opening in one of said side walls, through which opening access may be had to the inside of the valve body for inspection and/or maintenance purposes.
- 4. The valve of claim 3 wherein:
- the valve includes two of said lid closable openings and corresponding lids which are located in said opposite side walls, said two openings and lids being identical in size and configuration except that one of the lids is adapted to house said elongated shaft by means of which said valve closure member can be operated from outside the valve.
- 5. The valve of claim 1, wherein:
- said sleeve region comprises at least one of boiler plate and mild steel.
- 6. The valve of claim 1, wherein:
- said outer valve region comprises at least one of boiler plate and mild steel.
- 7. The valve of claim 1, wherein:
- said upper valve portion includes an inner lining which communicates directly with the hot fluid material in said upper passageway for heat-protecting said sleeve.
- 8. The valve of claim 7, wherein:
- said inner lining comprises a sleeve of stainless steel.
- 9. The valve of claim 1, wherein:
- said valve passage and elongated shaft extend substantially transversely to a flow direction of said hot fluid material in said valve.
- 10. The valve of claim 1, wherein:
- said cooling fluid comprises water.
Priority Claims (1)
Number |
Date |
Country |
Kind |
95/2615 |
Mar 1995 |
ZAX |
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Parent Case Info
This application is a continuation of commonly assigned, U.S. patent application Ser. No. 08/544,990 filed Oct. 30, 1995, now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1389405 |
Jan 1965 |
FRX |
Continuations (1)
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Number |
Date |
Country |
Parent |
544990 |
Oct 1995 |
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