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Figure 1-3:
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Open position
As pipeline pressure increases, the combined force of the spring and nitrogen gas pressure
is overcome and the valve opens.
Figure 1-4:
User manual
Closed position
The oil reservoir is supplied with two sight gauges. When the valve is closed the oil
level in the reservoir will show oil covering the lower sight glass only.
Oil visible in both the lower and upper sight gauges indicates that the valve is in the
open position.
Absence of oil in the lower sight gauge indicates that proper oil capacity has not
been reached or that reservoir oil is leaking into the product system. (See below.)
Open position
Introduction
7
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