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LicenseThis image is released under a CC BY-NC-SA 4.0
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Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseThis image is released under a CC BY-NC-SA 4.0
Licence
Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseThis image is released under a CC BY-NC-SA 4.0
Licence
Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseThis image is released under a CC BY-NC-SA 4.0
Licence
Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseThis image is released under a CC BY-NC-SA 4.0
Licence
Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseThis image is released under a CC BY-NC-SA 4.0
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Buy this image as a print
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Science Museum Group Collection
© The Board of Trustees of the Science Museum
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Wilson Klotz, patent 1876 Duplex Safety Valve, 3 1/2" diam. Sectioned to show the spring
This safety valve, patented in 1876 by Mr. J. C. Wilson, is so constructed that the full pressure of the steam is exerted on the area of the valve even when blowing off freely, allowing it to remain open to the fullest extent possible when required by circumstances. The steam pressure is maintained under the crown of the valve by a central pipe reaching well into the steam space of the boiler, while the escaping steam passes to the lip of the valve in the ordinary way. The spring is enclosed in a metal casing to prevent its being tampered with, and also to shield it from the escaping steam.
