Automatic Cylinder Cocks
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Automatic Cylinder Cocks
by Steve Adler, Vancouver Island Model Engineers
Retrieved from archive.org
These cylinder cocks cost practically nothing and can be easily made in an evening. They vent condensate and snap shut on stream. Additionally, they become sifting valves when drifting. Water moves slowly in these cocks and steam more quickly. The stainless steel ball is pushed against the lower "A" outlet. After fabrication, take a mouthful of water and blow into the upper "A" inlet. The water will exit and the following air will snap the cylinder cocks shut. Dimensions are not critical.
| 1 inch Scale | 1-1/2 inch Scale |
|---|---|
| A: 0.0785 inch No. 47 drill 2 places | A: 0.120 inch No. 31 drill 2 places |
| B: 0.159 inch No. 21 drill | B: 0.213 inch No. 3 drill |
| C: 10-32 | C: 1/4-28 |
| D: 1/8 inch stainless steel ball | D: 5/32 inch stainless steel ball |
| E: 5/16 inch round or hex | E: 9/16 inch round or hex |
| F: 7/16 inch | F: 5/8 inch |