BENDIX DOUBLE CHECK VALVES Manual

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Bendix

Double Check Valves

SUPPLY

DELIVERY

O-RING

CAP

BODY

FIGURE 1 - DC-4

™

DOUBLE CHECK VALVE (SHUTTLE TYPE)

DESCRIPTION

Double check valves are used in an air brake system to

direct a flow of air into a common line from either of two

sources, whichever is at the higher pressure. They may be

used for directing air flow for specific functions or to select

the higher pressure of either of two sources of air as a

supply source.

Bendix manufactures two types of double check valves:

shuttle and disc. Although the valves are somewhat different

physically, the same function is performed by both types.

The difference in the design of the two valves is that the

shuttle type has a movable shuttle to seal off the lower

pressure source, whereas the disc type has a movable disc.

SUPPLY

O-RING

SHUTTLE

VALVE

CAP

SHUTTLE

GUIDE

FIGURE 2 - DOUBLE CHECK VALVE (DISC TYPE)

OPERATION

As air under pressure enters either end of the double check

valve (inlet port) the moving shuttle or disc responds to the

pressure and seals the opposite port, assuming it is at a

lower pressure level than the other. The air flow continues

out the delivery port of the double check valve. The position

of the shuttle or disc will reverse if the pressure levels are

reversed. Double check valves are designed so that the

shuttle or disc can never impede the backflow of air in the

exhaust mode.

Figure 3 (see page 2) illustrates a typical use of a double

check valve to control a given device, such as trailer brakes,

from either of two control sources.

Figure 4 (see page 2) illustrates a typical use of a double

check valve to supply air to a system or systems from either

of two separate sources, whichever is at the greater pressure

level. In this type of installation the pressure differential to

which the valve is subjected may under certain conditions

be minimal. It is therefore suggested that performance of

the double check valve will be optimized if it is mounted in

the horizontal position.

DELIVERY

SUPPLY

VALVE

GUIDE

SUPPLY

DELIVERY

VALVE

DISC

BODY