By the 1950s the company manufactured a range of N.C. (non chatter) locomotive steam bypass valves that were sold to many overseas railway companies. WOTA bypass valves were first produced in the 1930s and over 30,000 were made during the first 20 years of production. The valves were supplied to many countries including Burma, Egypt, India, Kenya, Pakistan, Rhodesia, South Africa, and South America.

The following images are taken from one of the company's catalogues.


A WOTA  N.C. bypass valve.

 
 
A cut-away valve showing the plunger,
plunger ring and plunger spring.

A technical drawing showing 
how the parts fitted together.


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