BENDIX PP-2 매뉴얼 - 페이지 2

{카테고리_이름} BENDIX PP-2에 대한 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. BENDIX PP-2 4 페이지. Push-pull type control valves

페이지 인쇄

AUTOMATIC

MOMENTARY

EXHAUST

PP-1

20,30,40

or 60 psi

PP-2

40 psi

PP-5

40 psi

RD-3

Must be held

PP-8

REMOVAL

Block and/or hold the vehicle by a means other than air

brakes and drain all reservoirs.

1. Drive the button roll-pin out with a punch and remove the

button.

2. Mark each air supply line and its port for easy reinstalla-

tion, then disconnect them. Remove the valve from the

panel by removing the panel mounting nut.

INSTALLING

1. Install valve in panel, securing with the panel mounting

nut.

2. Reconnect the air lines using marks made during removal

as a guide.

3. Install the operating button. Secure the operating button

by installing the button roll pin.

DISASSEMBLY: PP-1

VALVES

1. Remove the two cap screws (3) which retain the lower

cover and remove cover. Remove the sealing ring (4).

2. Insert a small punch through the roll pin hole in the stem

and remove the lock nut (5).

3. Remove inlet-exhaust valve (6) and plunger (7) and spring

(8) (if any).

4. Remove o-ring (9) from plunger.

DISASSEMBLY: PP-5

1. Perform same operations as for PP-1

2. Remove inlet seal (10) in Figure 4 from lower cover.

Remove the ring diaphragm (4) from the inlet seat.

3. Remove piston (11) Figure 4 and o-ring (2).

DISASSEMBLY: PP-2

1. Insert a small punch through the roll pin hole in the plunger

and remove the lock nut (1) from the plunger.

2. Withdraw the plunger and remove the spring (9) and

o-ring (8).

3. Remove the two machine screws (2) and remove the

lower cover (3).

PILOT TRIP

APPLY

FEATURE

AUTOMATIC

18 psi

manually

Will remain in

either position

™

, PP-8

AND RD-3

™

VALVE

™

valve.

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VALVE

4. Remove the inlet-exhaust valve (4), and piston (5).

NON-

5. Remove o-rings (6 & 7) from piston.

OPERATING AND LEAKAGE TESTS

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PP-1

, PP-8

1. An accurate test gauge should be tee'd into the supply

line and a means of controlling the supply pressure pro-

vided. Apply a 120 psi air source to the supply port. A

small volume reservoir (e.g. 90 cu. in.) with a gauge

should be connected to the delivery port.

2. With 120 psi supply pressure, and the button pulled out

(exhaust position), leakage at the exhaust port should

not exceed a 1" bubble in 5 seconds; at the plunger

stem a 1" bubble in 5 seconds. There should be no leak-

age between upper and lower body.

3. Push the button in (applied position). Leakage at the ex-

haust port should not exceed a 1" bubble in 3 seconds; at

the plunger a 1" bubble in 3 seconds. (The RD-3

will have to be manually held in this position.)

4. Reduce the supply pressure. At a pressure from 60 to

20 psi depending on the spring installed the button should

pop out automatically, exhausting the delivery volume.

(This does not apply to the RD-3

™

PP-1

valve's).

PP-5

™

VALVE

1. Proceed as for PP-1

2. Connect a modulated source of air pressure to the pilot

™

air inlet. With the button pushed in (applied position)

with 125 psi supply pressure and a gradually increasing

pressure applied at the pilot air port the valve should

move to the release position with a pilot pressure of not

more than 18 psi. Leakage in this mode should not

exceed a 1" bubble in 3 seconds at the exhaust port

and a 1" bubble in 5 seconds at the plunger stem.

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PP-2

VALVE

1. Proceed as for PP-1

2. With the button pulled out (exhaust position), leakage

at the brake valve port or at the plunger stem should not

exceed a 1" bubble in 5 seconds.

3. Push the button in. Supply pressure should be present

in the delivery volume. Leakage at the exhaust port or

around the plunger stem should not exceed a 1" bubble

in 5 seconds.

4. Pull the button out and apply supply pressure at the

brake valve port. Supply pressure should be present in

the delivery volume and leakage at the exhaust port

should not exceed a 1" bubble in 5 seconds.

Note: If any of the above push-pull valves do not function as

described or if leakage is excessive, it is recommended

they be returned to our nearest authorized distributor for a

factory rebuilt or new valve.

™

, RD-3

VALVE

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valve through Step 3.

™

valve through Step 1.

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valve

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, PP-8

™

or some