OPERATING AND LEAKAGE TESTS

OPERATING TEST

Two accurate air gauges are necessary to perform these

tests. Depending upon installation, it may be necessary to

remove valve to properly test it. Correct opening pressures

of the valve should be known before beginning tests; consult

vehicle manual.

1. Install an accurate gauge in the common control and

supply line; install another gauge in the delivery port.

2. Gradually apply air pressure to the common supply and

control line. As common supply and control pressure

increases, note at what pressure delivery of air through

valve is made and compare with specifications in vehicle

manual.

3. Slowly decrease pressure in the common supply and

note at what pressure delivery line pressure is vented;

compare with vehicle manual.

4. Pay particular attention to the exhaust check valve in

the exhaust port if so equipped (note figure 3). Make

certain it is free of contamination and the rubber valve is

free to function. Replace this item as necessary.

LEAKAGE TEST

1. With 120 psi air pressure present in supply, control and

delivery ports:

- Apply a soap solution around control port cap nut and

supply port cap nut. No leakage is permitted.

- Apply soap solution to the exhaust port; leakage must

not exceed a 1" bubble in less than 5 seconds (100

sccm).

Excessive leakage would indicate a faulty o-ring, inlet/

exhaust valve or piston exhaust seat.

2. Plug the delivery port and apply 10 psi to the supply port

only. Apply soap solution to the exhaust port:

-For the SV-1

™

valve - leakage must not exceed a 1"

bubble in less than 5 seconds (100 sccm).

-For the SV-3

™

& SV-4

™

valve - leakage must not exceed

a 1" bubble in less than 10 seconds (50 sccm).

Excessive leakage would indicate a faulty inlet valve or

inlet valve seat.

If the valve does not function as described or if leakage is

excessive, it is recommended that it be replaced with a new

unit, or repaired with genuine Bendix parts available at Bendix

outlets.

REMOVING AND INSTALLING

REMOVING

1. Block and hold vehicle by means other than air brakes.

2. Drain air brake system.

3. Identify the air lines to facilitate reinstallation, disconnect

the lines, remove the mounting bolts, and then the valve.

INSTALLING

1. Mount the valve securely.

2. Check and clean air lines; identify air lines and connect

to valve.

DISASSEMBLY

1. Remove the control port cap nut and its o-ring. Remove

the o-ring from the cap nut.

2. Remove the piston from the valve body. Remove the large

and small piston o-rings from the piston.

3. Remove the piston return spring from the body.

4. Remove the supply port cap nut and its o-ring. Remove

the o-ring from the cap nut.

5. Remove the inlet/exhaust valve stop (SV-1

™

valve) or the

spring guide (SV-3

™

& SV-4

™

valve), then the inlet/

exhaust valve spring.

Note: The SV-4

™

valve contains a check valve which is

installed in the opposite end of the inlet/exhaust

valve return spring.

6. Remove the inlet/exhaust valve.

7. Remove the exhaust check valve if so equipped.

CLEANING AND INSPECTION

1. Using good commercial grade of solvent, clean and

thoroughly dry all metal parts. Do not damage bores

with metal tools.

2. Inspect the interior and exterior of all metal parts that

will be reused for severe corrosion, pitting and cracks.

Superficial corrosion and/or pitting on the exterior portion

of the body and cap nuts is acceptable. Replace the

entire valve if the interior of the body or cap nuts exhibit

signs of corrosion or pitting.

3. Inspect the body bore and the check valve seat in the

supply port cap nut of the SV-4

™

valve for deep scuffing

or gouges. Replace the entire valve if either are found.

4. Inspect the pipe threads in the body and cap nuts. Make

certain they are clean and free of thread sealant.

5. Inspect all springs for signs of corrosion, pitting and

cracks. Replace as necessary.

6. Inspect all air line fittings for corrosion and replace as

necessary. Make certain to remove all old thread sealant

before reuse.

7. Inspect the exhaust check valve making certain all

passages are clear and open.

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Instrukcje obsługi i podręczniki użytkownika dla Macierze dyskowe ATTO Technology Diamond Storage Array S-Class.
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