Model of rack and pinion valve, c.1847.
Model of Baurer valve, 1919.
Model of worm and rack valve, c.1870.
Model of 3-way gas valve.
Model of Hicks valve, c.1912.
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
Western valve model.
Model of 4-way rack and pinion valve, 1902.
1902
Model of Walker Duplex purifier valve.
Model of purifier centre valve.
