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| Machining a slide valve in the 4 jaw. The design is to use a balance slide valve which requires a hole in the top of the valve for the balance piston to sit in. | A valve and valve buckle. The O ring will be fitted to the balance piston. |
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| Machining the holes in the buckle for the valve rods. The threaded bar was used to ensure that the centres of the holes matched up. | A finished valve assembled in the valve chest. |
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