The Bell & Gossett® snap zone valve is a compact four-wire thermoelectrically operated on-off zone valve designed for heating and cooling systems. Featuring an innovative compact design and an adapter ...

The Zone Sentry™ zone valve’s patented technology uses a microcircuit-based logic to control a gear-driven electronically actuated ball valve to control fluid flow. The advanced design uses 93 percent ...

Recently I wrote in this column that every component in a controls circuit is a power supply, a switch or a load — no other possibilities. And that means that every control, hydronic or otherwise, is ...