Multi-valve interlock apparatus

摘要

An interlock is disclosed for permitting only one of a plurality of interrelated valve elements to be operated at one time. A transverse channel is formed in each valve element for alignment with a channel formed in the valve housing when the valve elements are moved to their respective opened positions. When any one valve element is moved to its closed position, camming surfaces formed on the valve element are positioned and shaped to cause a train of end abutting links disposed within the valve and housing channels to be displaced in a manner to lock the remaining valves in their respective open positions. The valve channels and camming surfaces are formed by very simple and inexpensive linear cutting operations thereby allowing the disclosed device to be inexpensively manufactured.