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Model of worm and rack valve, c.1870.

Model of Hicks valve, c.1912.

Sectioned model (scale 1:24) of a Pickering purifier valve

Model of Walker Duplex purifier valve.

Model of coke oven valve, c.1915.

Model of rack and pinion valve, c.1847.

Model of Baurer valve, 1919.

Model of 3-way gas valve.

Western valve model.

Model of a sectioned gas valve

Model of Cripps Duplex hydaulic main valve.

Ball-plug valve, type M (sectioned).

Model of Walker Trinity valve

Model of Milbourne Duplex purifier valve.

Waller "Phoenix" double-gate valve cutaway travelling salesman's model

Model of 4-way rack and pinion valve, 1902.

1902

Model of purifier centre valve.

Model (1.8) of Walker patent 189 centre valve for 4 gas purifiers in fitted box