In hydronic heating, to control where heated water goes to various sections of a building, the system might rely on two or more zone valves. A zone valve opens or closes based on demand from a ...

February 13, 2009 Technology capable of generating electricity by extracting energy from heat that is otherwise just wasted is a fairly new branch of renewable technology. A typical co-generation ...

With the introduction of the new 5.0L, Four-Valve Coyote motor, the original Two-Valve has taken yet another step back in terms of popularity. The Three- and Four-Valve variants get all the publicity ...

Time was when a valve job was done with some valve-grinding compound and a vacuum cup on a stick. But no more. Today's high performance engines require the same machining precision in the valves that ...

Why is it that the Three-Valve, Four-Valve, and (especially) Shelby GT500s get all the modular love, when the Two-Valve motors are arguably the workhorse of the family? I know-the Four-Valve motors ...

A heat pump functions as a typical air conditioning system in the cooling mode — absorbing heat from indoors and rejecting it outdoors. In heating mode, the coils reverse their functions. The outdoor ...