Model of rack and pinion valve, c.1847.
Model of 4-way rack and pinion valve, 1902.
1902
Model of Walker Duplex purifier valve.
Model of purifier centre valve.
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
Sectioned model (scale 1:24) of a Pickering purifier 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
