Pages from A1-565AC-410-000_2023-05-11_08-35-46.pdf

A1-565AC-410-000 001 00

Change 3 Page 13

29. Supply and External Port Leakage Test.

a. Connect pressure regulator (12, figure 6), shutoff valve (8), and pressure gauge (9) to cold air inlet using adapter (19). Connect cold air measuring section with shutoff valves (6 and 7) around shutoff valve (8).

b. Connect pressure. regulator (5) and pressure gauge (13) to warm air inlet using adapter (21).

NOTE

Ensure shutoff valve (11) is closed for the following test. If shutoff valve (11) cannot be completely closed, modify test setup for this test only, by capping the mixed outlet port downstream of pressure gauge (10).

c. Adjust pressure regulator (5) to obtain 93 to 97 psig indicated on pressure gauge (13).

d. Open shutoff valve (8). Adjust pressure regulator (12) to obtain 162 to 172 psig indicated on pressure gauge (9). Open shutoff valves (6 and 7) and slowly close shutoff valve (8).

e. Measure the external leakage indicated at the cold air measuring section. Record external leakage as reading B. Mixed outlet pressure gauge (10) shall not exceed 88 to 92 psig. (QA)

f. Open shutoff valve (16) and adjust pressure regulator (1) to obtain 14 to 16 psig indicated on pressure gauge (2). Open shutoff valves (15 and

17) and slowly close shutoff valve (16). Adjust current to 100 to 108 milliamperes to electro-magnetic control valve (14).

g. Measure port leakage indicated at supply port leakage measuring section. Record as reading C.

h. Add recorded readings A, B, and C. Total external leakage shall not exceed 0.40 lb/min. (QA)

i. Adjust pressure regulators (1, 5, and 12) to reduce pressure to zero psig on pressure gauges (2, 9, and 13). Close all shutoff valves (6, 7, 15, and 17). Reduce current to zero milliamperes on the electro-magnetic control valve (14).

j. Disconnect air supply source, pressure regulators (1, 5, and 12), shutoff valves (4, 6, 7, 8, 11, 15, 16, and 17), pressure gauges (2, 3, 9, 10, and 13), adapters (19, 20, 21, and 22), and electrical cable.

30. FINAL TESTING.

a. If the number of washers (45, figure 10) is adjusted during TESTING AND TROUBLESHOOTING, perform the following:

(1) Remove cover assembly (31), screws (38), washers (36, 37, and 39), and nuts (35) from valve body (50).

ADHESIVE SEALANT 1

RTV-3145 (GRAY)

(2) Apply a thin, even coat of adhesive to diaphragm (42) mating surfaces of valve body (50).

(3) Reinstall cover assembly (31) to valve body (50) with the vent port oriented as shown in figure 10 while still wet.

(4) Install nuts (35), washers (36, 37, and 39), and screws (38).

(5) Torque screws (38) 10.5 to 11.5 in-lbs above run-on torque.

b. Perform Cold Air Poppet Functional Test and Supply and External Port Leakage Test.

31. TROUBLESHOOTING.

NOTE

The following troubleshooting procedures relate to malfunctions found during testing of the valve. When reference is made to inspect a particular part, refer to INSPECTION, DISASSEMBLY or ASSEMBLY paragraphs. If troubleshooting procedures necessitate any disassembly, removal, or replacement of valve components, all testing and adjustment procedures shall be performed before returning the valve to service.

a. If unable to meet the requirements for the insulation resistance and dielectric tests, replace electro-magnetic control valve (1, figure 10).

CUI

A1-565AC-410-000 001 00

1 Pressure Regulator 12 Pressure Regulator 2 Pressure Gauge 13 Pressure Gauge 3 Pressure Gauge 14 Electro-Magnetic Control Valve 4 Shutoff Valve 15 Shutoff Valve 5 Pressure Regulator 16 Shutoff Valve 6 Shutoff Valve 17 Shutoff Valve 7 Shutoff Valve 18 Position Indicator 8 Shutoff Valve 19 Adapter PN 18D11644-1 9 Pressure Gauge 20 Adapter PN 18D11644-2

10 Pressure Gauge 21 Adapter PN 18D11644-3 11 Shutoff Valve 22 Adapter PN 18D11644-4

Figure 6. Vent Suit Temperature – Test Setup Port Leakage Test