DELIVERY VALVE ASSEMBLY TEST (50)

TESTS AND ADJUSTMENTS (CONTINUED)

DELIVERY VALVE ASSEMBLY TEST (50)

Assemble delivery valve assembly (l), spring (2), and holder

(3) to valve test adapter (TSE 76226). Torque adapter to

VALVE TEST ADAPTER

lb- ft.

NOTE

Make sure all external connections are tight and

test stand is in good working order.

Attach valve test adapter

manually operated nozzle test

stand.

NOTE

Leaking delivery valve assembly can be corrected

by lapping valve seat to corresponding seat in de-

TEST STAND

livery valve body with

amount of lapping

compound (item 23, Appx C). Lapping compound is

VALVE TEST ADAPTER

to contact valve and body seats only. Thoroughly

clean

assembly following lapping operation.

Slowly increase pressure to 300 psi. A rapid pressure drop

indicates leakage past delivery valve seat.

Slowly increase pressure until valve opens. Valve must

open between 300 and 600 psi. If not, replace delivery valve

spring and test assembly again.