Filter Pressure Gage Tap.

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-

1-36

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

pressure gage.

Outlet Selector Valve. The outlet selector valve (16-Fig.8),

1-37

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),

1-38

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.

1-40

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.

1-41

Operation Under Usual Conditions.

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