Weight-actuated spring-biased valve

A weight-actuated spring-biased valve device for controlled fluid-mixing, comprising:

• a spring-loaded valve mechanism including a flow valve, a valve operating lever that pivots between a closed position and an open position, and a valve spring element that biases the valve operating lever to the closed position;
• and
• a spring-loaded valve-release control mechanism that locks the valve operating lever in the open position and selectively releases the valve operating lever from the open position to move under the biasing force of the valve spring element to the closed position, wherein the control mechanism includes a pivotal release lever having an engagement arm and an opposite load arm, and a release spring device that biases the release lever from a blocking position with the engagement arm retaining the valve operating lever in its open position to a release position with the valve operating lever free to pivot past the engagement arm and to the closed position under the biasing force of the valve spring element, wherein the release-lever load arm includes an additive-container support that supports a load of an additive fluid to be mixed with a carrier fluid whose flow is controlled by the flow valve,
• wherein in use, upon removal of the additive-fluid load on the load arm from depletion of the additive fluid, the biasing force of the release spring device is then greater than the load of the additive fluid, so the release lever pivotally displaces under the biasing force of the release spring device from its blocking position toward its release position to disengage from the valve operating lever, which in turn then pivots from its open position to its closed position under the biasing force of the valve spring element, and
• wherein the carrier fluid is water, the additive fluid is a chemical sanitizer concentrate fluid, and the spring-loaded valve-release control mechanism operates the spring-biased valve mechanism to shut off flow of the water upon depletion of the chemical sanitizer concentrate fluid to ensure a predetermined mixture ratio results.