SECTION I (Con' t.)
from the inlet to the outlet side of the low pressure filter, there-
by determining the condition of the filter element.
The filter pressure gage tap (13-
Filter Pressure Gage Tap.
Fig.8), extending through the test stand control panel, provides a
means of connecting a test gage to check the accuracy of the filter
Outlet Selector Valve. The outlet selector valve (16-Fig.8),
mounted on the test stand control panels is a 4-way, plug-type valve,
providing a means of selecting either the 1/2 in. or 3/4 in. outlet
connections of the test stand.
Fluid Temperature Gage. The fluid temperature gage (2-Fig.8),
centrally located at the top of the test stand control panel, is a
needle-indicating, direct-reading, temperature gage graduated from
-20 to 250 degrees Fahrenheit in increments of 2 degrees. During
operation the indicated fluid temperature should never exceed 160° F.
1-39 Pressure Regulator Valve.
The pressure regulator valve (8-Fig.
7B) is located in the 1 inch return line between the bulkhead hose
connection and the low pressure filter manifold. The valve is a
spring loaded, direct-acting diaphragm type, preset to maintain the
rated output of the high pressure pump at the same time that the in-
let fluid pressure to the stand is varied throughout the range of 16
inches HG absolute to 110 psig pressure without damage to the pump.
Low Pressure Relief Valve.
The low pressure relief valve
(10-Fig.7B), located in the manifold between the low pressure filter
and the pressure regulator valve, protects the high pressure pump
from excessive inlet pressure in the event that the pressure regulat-
or valve should malfunction.
Operation Under Usual Conditions.