BENDIX SD-03-905 Bedienungsanleitung PDF herunterladen

Bendix

QR-N

™

Quick Release Valve

SD-03-905

MOUNTING HOLE (2)

SUPPLY PORT

FIGURE 1

EXHAUST PORT

DELIVERY

PORT

DESCRIPTION

The function of the Bendix

QR-N

™

quick release valve is to

“speed up” the exhaust of air from the actuators it serves. It

is generally mounted on the vehicle axle midway between

the two actuators connected to it.

In the standard (Refer to Figure 1) QR-N

™

valve a ﬂ at

circular diaphragm is installed between the nonmetallic

upper body and stamped steel lower body. An o-ring seals

the two body halves which are held together using four 1/4"

machine screws and ﬂ ange nuts.

In its standard conﬁ guration the QR-N

™

valve is supplied

with a 1 psi (6.9 kPa) maximum differential. For example

with supply pressure at 10 psi (68.9 kPa) delivery pressure

is 9 psi (61.8 kPa). Higher differential pressures are

available for special applications and are obtained by the

addition of a spring and diaphragm follower to the standard

QR-N

™

valve (Refer to Insert A).

Various pipe thread sizes are available for the single supply

port and two delivery ports of the QR-N

™

valve. QR-N

™

valve mounting is accomplished via two 11/32" diameter

holes on 1-1/2" centers.

OPERATION

With no air pressure applied to the QR-N

™

valve (Refer

to Figure 1), the diaphragm is slightly ﬂ exed by the upper

and lower body. In this condition the center portion of the

diaphragm rests on the exhaust port in the lower body while

the outer edge and opposite side of the diaphragm rests

against the sealing lip of the upper body.

APPLY

Air entering the supply port of the QR-N

™

valve causes the

center portion of the diaphragm to seal the exhaust port.

Simultaneously, the outer edge of the diaphragm moves

away from the sealing lip of the upper body allowing air to

ﬂ ow from the supply port out the delivery ports.

BALANCE

When air pressure on both sides of the diaphragm

is approximately equal (1 psi differential), the natural

resiliency of the diaphragm material causes the outer

edge of the diaphragm to move into contact with the upper

body sealing lip. The QR-N

™

valve exhaust remains sealed

because air pressure bears against the center portion of

the diaphragm from one side only.

UPPER BODY

DELIVERY

PORT

SEALING RING

LOCKWASHER

CAP SCREW

SPRING FOLLOWER

DIFFERENTIAL SPRING

LOWER

BODY

INSERT A

DIAPHRAGM

1 2 3 4

Inhaltsverzeichnis

Seite 1 - SD-03-905

1Bendix® QR-N™ Quick Release ValveSD-03-905MOUNTING HOLE (2)SUPPLY PORTFIGURE 1EXHAUST PORTDELIVERY PORTDESCRIPTIONThe function of the Bendix® QR-N™ q

Seite 2 - INJURY OR DEATH:

2RELEASEWhen air pressure is reduced or removed from the QR-N™ valve supply port, the air pressure on the delivery side of the diaphragm is greater th

Seite 3

34. If the QR-N™ valve does not function as described or if leakage is excessive, it is recommended that it be replaced with a new or remanufactured

Seite 4