Patent ID: 8375982
Filing Date: 2013-02-19
Classification: G05D,Y10T

Abstract:
1. A multifunction fluid valve for governing flow within a fluid passage, comprising: a valve means, having its proportion of opening to fluid flow within the fluid passage being responsive at least in part to the action of fluid flow across the valve means; an actuator, including a first biasing means for establishing a first, principal biasing force for opposing opening of the valve means by action of fluid flow in a first direction across the valve means; and establishing an actuation state of the valve means that establishes a transitional valve opening position beyond which position the first biasing means is active to oppose further opening of the valve means by action of flow in the first direction across the valve means, and below which the first biasing means is not active; and a second biasing means providing a second biasing force opposing the opening of the valve means by action of fluid flow across the valve means, wherein the second biasing force is substantially smaller than the first, principal biasing force.