BENDIX MC-12 MODULATOR CONTROLLER ASSY Instrukcja Naprawy Pobierz pdf (Strona 16)

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Additional Charging System Related Components

A double check valve is used in the air system when a

single function or component must receive air from, or

be controlled by, the higher of two sources of pressure.

An internal disc or shuttle moves in response to the

higher air pressure and allows that air source to ﬂ ow

out of the delivery port. It is recommended that double

check valves be mounted so that the shuttle (or disc)

operates horizontally.

While not strictly part of the charging system, the

DS-2

™

double check valve and stop light switch

(shown on this page) performs the function of both a

stop lamp switch and a double check valve. In some

vehicle brake systems, it is used to detect air pressure

from either brake circuit source, and will operate the

stop lamp switch, lighting the stop lamps.

Auxiliary Systems

Vehicle auxiliary components and systems (air actuated

wipers, suspension, etc.) requiring compressed air

must wait until the reservoirs in the charging system

have reached a predefined minimum pressure,

sufﬁ cient for braking purposes. Once the system

has reached the preset minimum, pressure protection

valves open to supply auxiliary systems.

Pressure P rotection Valves

The pressure protection valve is a normally-closed

pressure sensitive control valve. These valves can be

used in many different applications but are typically

used to protect or isolate one reservoir from another,

by closing automatically at a preset pressure. The

valve is also commonly used to delay the ﬁ lling of

auxiliary reservoirs until a preset pressure is achieved

in the primary or braking reservoirs. Pressure

protection valves allow air to be “shared” between

two reservoirs above the closing setting of the valve.

The sharing ceases when pressure drops below the

closing pressure of the valve and the reservoirs are

then isolated from each other.

The PR-2

™

pressure protection valve is externally

adjustable, while the PR-4

™

pressure protection

valve (shown) has a ﬁ xed setting. Both valves are

available in various factory preset pressure settings.

The PR-3

™

pressure protection valve differs from the

two previously mentioned since its design includes a

check valve preventing air return.

DC-4

Double

Check

Valve

RV-1

™

Pressure

Reducing

Valve

DS-2

™

Double Check

and Stop Light

Switch

Pressure R educing Valves

The pressure reducing valve is used in various

applications where a constant set air pressure lower

than supply pressure is required. A typical application

is an air operated accessory that requires less than

system pressure for operation. The RV-1

™

pressure

reducing valve (shown) is available in a wide range

of pressure settings and can be manually adjusted.

The RV-3

™

pressure reducing valve is available with

factory preset pressure settings only and cannot be

manually adjusted.

Pressure

Protection

Valve

Auxiliary

PR-4

™

Pressure

Protection

Valve

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