Instruction Manual

ManualsBrandsBendix Commercial Vehicle Systems ManualsEquipmentSV-1 SYNCHRO/SV-3 TRAILER RELEASE

SD-03-4020

Bendix

SV-1

™

Synchro Valve SV-3

™

& SV-4

™

Trailer Release Valve

FIGURE 1 - SV-1

™

SYNCHRO VALVE

FIGURE 2 - SV-3

™

& SV-4

™

TRAILER RELEASE VALVE

1/4" P.T.

DELIVERY

PISTON

VALVE

BODY

CAP NUT

VALVE

SPRING

O-RING

SPRING

GUIDE

1/4" P.T.

CONTROL

1/8" P.T.

EXHAUST

O-RING

CAP NUT

O-RING

PISTON

SPRING

1/4" P.T.

SUPPLY

CONTROL

EXHAUST

SUPPLY

DELIVERY

CONTROL

EXHAUST

SUPPLY

DELIVERY

DESCRIPTION

The SV-1

™

synchro valve and the SV-3

™

trailer release valve

are pilot operated, non-graduating pneumatic control valves.

These valves are used to control air from a remote supply,

have set opening and closing pressures and can be used to

delay or sequence the action of other pneumatic devices.

GENERAL

The SV-1

™

synchro valve (figure 1) and SV-3

™

& SV-4

™

trailer

release valves (figure 2) are air controlled, “On-Off” (non-

graduating) control valves that are primarily used to delay or

sequence various devices and events in the air brake system.

These valves can be operated either in an automatic or

manual mode using different air connection methods.

Two .28 inch mounting holes are provided in the die cast

aluminum body for panel or frame mounting. Two hex cap

nuts at the ends of the cylindrical valve body retain the internal

1/4" P.T.

DELIVERY

PISTON

VALVE

BODY

CAP NUT

VALVE

SPRING

O-RING

SPRING

GUIDE

1/4" P.T.

CONTROL

1/8" P.T.

EXHAUST

O-RING

CAP NUT

PISTON SPRING

1/4" P.T.

SUPPLY

O-RING

CHECK VALVE

DETAIL OF SV-4

™

VALVE

SV-4

™

VALVE

SV-3

™

VALVE

DETAIL OF SV-3

™

VALVE

Summary of content (6 pages)

PAGE 1
SD-03-4020 ® Bendix® SV-1™ Synchro Valve SV-3™ & SV-4™ Trailer Release Valve CONTROL CONTROL EXHAUST EXHAUST DELIVERY DELIVERY SV-3™ VALVE SUPPLY SUPPLY 1/4" P.T. CONTROL 1/4" P.T. CONTROL CAP NUT O-RING O-RING PISTON SV-4™ VALVE CAP NUT O-RING PISTON O-RING PISTON SPRING PISTON SPRING O-RING 1/8" P.T. EXHAUST O-RING BODY 1/8" P.T. EXHAUST 1/4" P.T. DELIVERY 1/4" P.T.
PAGE 2
components. The air connection ports for SV-1™, SV-3™ & SV-4™ valves are the same and are located in relatively the same position on each model. All connections are pipe thread. Lettering embossed in the valve body identifies two of the four connection ports in these valves. Refer to the chart below and figure one. Air Connection Air Supply Delivery Control Exhaust Body Ident.
PAGE 3
AUTOMATIC (self actuating at a pre-set pressure) There are two methods for accomplishing automatic operation of an SV valve. 1. One method for affecting automatic operation is to connect the SV valve control port to its supply port using a pipe or tubing tee. This is referred to as “common control and supply” since the pressure at the supply and control port is the same.
PAGE 4
OPERATING AND LEAKAGE TESTS OPERATING TEST Two accurate air gauges are necessary to perform these tests. Depending upon installation, it may be necessary to remove valve to properly test it. Correct opening pressures of the valve should be known before beginning tests; consult vehicle manual. 1. Install an accurate gauge in the common control and supply line; install another gauge in the delivery port. 2. Gradually apply air pressure to the common supply and control line.
PAGE 5
ASSEMBLY Prior to assembly, lubricate the piston, o-rings and body bores with Dow-Corning 55-M pneumatic grease (Bendix Pc. No. 291126). 1. Install the inlet/exhaust valve in the body. 2. Install the inlet valve spring and valve stop (SV-1™ valve) or spring guide (SV-3™ & SV-4™ valve). NOTE: Install the check valve in the small diameter end of the inletexhaust valve return spring of the SV-4™ valve before installing in the body. 3.