Cleaver-Brooks Profire E Series, Установка, эксплуатация и обслуживание, Страница: 32 / 84

Installation
2-8
750-297
Profire E/LNE Series Manual
FIGURE 2-6.
Typical Oil Supply Loop
2.7 — Oil Circulating Loop Operation
An oil circulating pump provides continuous oil circulation to the circulation loop. A back pressure valve holds
10 to 15 psi on the loop system. With the oil supply line connected only to the oil metering pump inlet, all oil
must pass through the pump. During pre-purge, unmetered oil flows through a bypass section of the oil metering
pump. Metered oil passes through the metering section to a de-energized 3-way oil valve (common port). Both
unmetered and metered oil must pass through the back pressure valve and return to an oil storage tank. The oil
metering pump will only meter oil. It will not serve as a circulating pump. At trial for main flame (main fuel), the
3-way oil valve is energized admitting metered oil to the nozzle for atomization and fast smooth ignition.
Unmetered oil continues to flow through the bypass section of the oil metering pump and returns to an oil
storage tank.