Gorman-Rupp Pumps 16D60-F3L 1270259 thru 1318306 - Manual (Page 13)

OM--05534 10 SERIES
PAGE B -- 6 INSTALLATION
off valve may cause a pump which has
lost prime to continue to operate with-
out reaching prime, causing dangerous
overheating and possible explosive
rupture of the pump casing. Personnel
could be severely injured.
Allow an over-heated pump to cool be-
fore servicing
. Do not remove plates,
covers, gauges, or fittings from an over-
heated pump. Liquid within the pump
can reach boiling temperatures, and va-
por pressure within the pump can cause
parts being disengaged to be ejected
with great force. After the pump cools,
drain the liquid from the pump by re-
moving the casing drain plug. Use cau-
tion when removing the plug to prevent
injury to personnel from hot liquid.
AUTOMATIC AIR RELEASE VALVE
When properly installed and correctly adjusted to
the specific hydraulic operating conditions of the
application, the Gorman-Rupp Automatic Air Re-
lease Valve will permit air to escape through the by-
pass line, and then close automatically when the
pump is fully primed and pumping at full capacity.
Theory of Operation
Figures 3 and 4 show a cross-sectional view of the
Automatic Air Release Valve, and a corresponding
description of operation.
Figure 3. Valve In Open Position
During the priming cycle, air from the pump casing
flows through the bypass line, and passes through
the Air Release Valve to the wet well (Figure 3).
Figure 4. Valve In Closed Position
When the pump is fully primed, pressure resulting
from flow against the valve diaphragm com-
presses the spring and closes the valve (Figure 4).
The valve will remain closed, reducing the bypass
of liquid to 1 to 5 gallons (3,8 to 18,9 liters) per min-
ute, until the pump loses its prime or stops.
Some leakage (1 to 5 gallons or [3,8 to
19 liters] per minute) will occur when
the valve is fully closed. Be sure the by-
pass line is directed back to the wet well
or tank to prevent hazardous spills.
When the pump shuts down, the spring returns the
diaphragm to its original position. Any solids that
may have accumulated in the diaphragm chamber
settle to the bottom and are flushed out during the
next priming cycle.
NOTE
The valve will remain open if the pump does not
reach its designed capacity or head. Valve closing
pressure is dependent upon the discharge head of
the pump at full capacity. The range of the valve
closing pressure is established by the tension rate
of the spring as ordered from the factory. Valve clos-
ing pressure can be further adjusted to the exact
system requirements by moving the spring retain-
ing pin up or down the plunger rod to increase or
decrease tension on the spring. Contact your Gor-
man-Rupp distributor or the Gorman-Rupp Com-
pany for information about an Automatic Air Re-
lease Valve for your specific application.