BENDIX MC-12 MODULATOR CONTROLLER ASSY Guida alla Risoluzione dei Problemi Scaricare il pdf (Pagina 23)

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Quick Release, Ratio Valves

Quick R elease Valves

The function of the quick release valve is to speed

up the exhaust of air from the air chambers. It is

mounted close to the chambers it serves. In its

standard conﬁ guration, the valve is designed to deliver

within one psi of control pressure to the controlled

device; however, for special applications the valve is

available with greater differential pressure designed

into the valve.

Several styles of quick release valves are available

and are functionally the same. The QRV

™

quick

release valve is the oldest design and utilizes a die

cast metal body with an internal diaphragm, spring

and spring seat. The QR-1

quick release valve

also has a die cast body and diaphragm, but does not

employ a spring or spring seat. The (non-serviceable)

QRN-2

™

quick release valve is a nonmetallic version

of the QR-1

quick release valve. The QR-L

™

quick

release valve is an inline device.

Ratio Valves

Historically, valves such as the LQ-2

™

, LQ-4

™

and

LQ-5

™

ratio valves (not shown) were used in the

front axle delivery line of vehicles. During normal

service brake applications, these valves were used to

automatically reduce application pressure to the front

axle brakes, however, as brake application pressure

was increased the percentage of reduction was

decreased until at approximately 60 psi (depending

upon valve design) full pressure was delivered.

QRV

™

Quick

Release Valve

QRN-2

™

Quick

Release Valve

QR-1

Quick

Release Valve

QR-L

™

Inline

Quick

Release Valve

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 69 70

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BENDIX MC-12 MODULATOR CONTROLLER ASSY Guida alla Risoluzione dei Problemi Pagina 23

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