and the reg is set to ZERO.Ī ZERO GOVERNOR is exactly that: It regulates fuel gas pressure to zero. It'll flow, because you're applying LESS THAN ZERO to it's output. Now put your lips over the hose and SUCK ON IT. IF you put your thumb over it, and squeeze strong, you'll hold back that 20psi, right? you grab the handle, twist it backwards, which relieves pressure on a spring, and the OUTPUT PRESSURE Gauge drops to 20psi. Let's say you've got somewhere between 80psi and 2500psi in the tank, but you need to feed out at no more than 20psi. To do that, you'd need a special fuel-pressure regulator.Ĭonsider the pressure regulator on your air compressor, torch tank. Imagine for a moment, that instead of drawing up liquid fuel, you draw up gaseous fuel. changes with respect to two things: THROTTLE POSITION and MANIFOLD VACUUM. Just downstream of the divergent zone is a throttle plate, and with all this in place, the suction in that tube. This happens to be the point where a little suction tube drops down into a float bowl, and because of the difference between venturi-divergent pressure (top of the tube) and atmospheric (in the bowl), there's a natural suction of liquid fuel up into the tube. As air coming through the constriction enters the divergent zone, airflow slows down, and in the process, there is a PRESSURE DIFFERENTIAL between exterior (atmosphere) and the venturi divergent zone. on the other side of the venturi, is a divergent segment. As the airflow approches the narrow spot (the convergent side), airspeed MUST increase. The device which modulates fuel delivery, is called by several names: "negative regulator", "Zero Governor", or "Fuel Controller", and the principle is simple:Ī common liquid-fuel carbeurator consists of a passage where incoming airflow is constricted through a narrow venturi. A vacuum-fuel lockoff is a fuel shutoff valve that opens only when vacuum is present. Manifold vacuum on a gaseous system is only used for one purpose: Fuel lockoff. When manifold vacuum is low, either the throttle is open wide, and the engine is heavily loaded, or the engine's not running. Think about this: When engine is running fast, and you close the throttle, manifold vacuum skyrockets, and fuel demand actually goes to nothing. Manifold vacuum is NOT used to determine 'how much' fuel to send, as it is actually OPPOSITE of demand. Vaporizers are also called 'coverters' or 'evaporators'. Vaporizers do exactly as the name suggests: They evaporate liquid propane, into gaseous.
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