US Patent: 2,287,433
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| System for Safeguarding the Operation of Steam Boilers
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Patentee:
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| Erling Klafstad (exact or similar names) - Melrose, Middlesex County, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Mar. 21, 1938 |
| Granted: |
Jun. 23, 1942 |
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Patent Pictures:
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Joel Havens
"Vintage Machinery" entry for Crosby Steam Gage & Valve Co.
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Description: |
| Abstract:
It is the purpose and object of the invention to provide adequate assurance that in a steam system provided with a steam bailer and super-heater, failure or cutting down of steam demand or a steaming rate greater than the demand shall result in prompt and adequate venting of both the steam boiler drum and the main steam line beyond the superheater either before damage is done to the system through the excessive pressure generated therein or to the superheater because of cessation of flow therethrough.
Claim:
Means for safe guarding a steam system having a boiler and superheater, comprising a safety valve venting directly from the drum of the steam boiler at a predetermined pressure, a second and spring-loaded safety valve venting from the steam line at the delivery side of the superheater and set to vent through the spring load at a predetermined and lower pressure than the drum safety valve, an independent pilot valve connected with the steam drum and set to operate at a Predetermined pressure lower than the setting of the drum safety valve, a pressure chamber associated with the superheater safety valve, connections for delivering steam from the drum to the pressure chamber when the pilot valve opens, and a piston within the chamber and connected with the spindle of the superheater safety valve and of sufficient area to augment the lifting pressure exerted by the superheated steam and invariably cause operation and venting of the superheater safety valve independent of the spring load upon opening of the pilot. |
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