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 Body Ident. Thread Size

Air Supply SUP 1/4" PT

Delivery DEL 1/4" PT

Control None 1/4" PT

Exhaust None 1/8" PT

IMPORTANT: An exhaust check valve should be installed in

the threaded exhaust port of these valves when they are

mounted outside the cab in unprotected environments.

SV-1

™

Synchro Valve

The SV-1

™

valve is a general purpose valve used in a variety

of applications on trucks, buses, tractors, trailers and

converter dollies. The SV-1

™

valve is the base valve from

which both the SV-3

™

and SV-4

™

valves are derived. It is

offered in a variety of pressure settings to accommodate

applications where automatic operation is required. It is easily

distinguished from the SV-3

™

and SV-4

™

valve by its smaller

size.

SV-3

™

Trailer Release Valve

While originally designed for automatic operation to

accomplish brake release on trailers without spring brakes,

the SV-3

™

valve can be used in any installation where its

single automatic pressure setting is advantageous. The

SV-3

™

valve is very similar in appearance to the SV-4

™

valve

but can be distinguished by measuring the length and

diameter of the supply hex cap nut (1/4" PT supply port).

See the comparison chart for the dimensions.

SV-4

™

Trailer Release Valve

The SV-4

™

valve was designed primarily for use on trailer

converter dollies to minimize the possibility of false charging.

Like the SV-3

™

valve it can be used in other applications.

The SV-4

™

valve is the combination of two valves; an SV-3

™

valve and a single check valve. A typical installation is

illustrated in figure 4. The SV-4

™

valve can be distinguished

from the SV-3

™

valve using the dimensions given in the

comparison chart. In addition, the tip of the check valve

contained in the SV-4

™

valve is visible at the bottom of the

¼" PT supply port.

SV-3

™

/SV-4

™

Valve Comparison

Supply Cap Nut Dimensions

Diameter Length

SV-3 .8125" 1.162"

SV-4 .94" 1.062"

OPERATION

GENERAL

The SV-1

™

, SV-3

™

, & SV-4

™

valves all operate in a similar

fashion. All can be connected in the air system so that other

valves control them. When connected in this non-automatic

mode the valve serves as a remote mounted, On-Off control.

They can also be installed so that they function automatically

or self actuate at a preset pressure. Automatic operation is

the most common application. Regardless of how they are

connected the internal valve operation is the same.

NON-AUTOMATIC (valve controlled remotely by another

valve)

With no air pressure present at the control port, supply port

air pressure and the inlet/exhaust valve spring hold the inlet

valve on its seat in the body. The piston is held away from

the inlet/exhaust valve by the piston spring, and the delivery

line is vented to atmosphere through the hollow exhaust

stem of the piston.

When sufficient air pressure is applied to the control port,

the control piston moves against the resistance of its return

spring. As the control piston moves, it contacts the exhaust

valve portion of the inlet and exhaust valve which seals the

hollow exhaust passage in the piston stem. Continued piston

movement drives the inlet valve from its seat and allows

supply air to flow through the body and out the delivery port.

When air pressure is removed from the control port, the

piston return spring and delivery port air pressure move the

piston away from the inlet/exhaust valve. As the piston moves,

the inlet valve re-seats itself preventing air flow to the delivery

port. Continued movement unseats the hollow exhaust

passage in the piston stem allowing delivery air to flow

through the stem and out the exhaust check valve.

FIGURE 4 - TRAILER CONVERTER DOLLY

SV-1

™

SYNCHRO

SINGLE CHECK VALVE

Note: An SV-4

™

valve can be used in place of the

SV-1

™

valve and single check valve shown here.

FIGURE 3 - EXHAUST CHECK VALVE STYLES

1/8" PIPE THREAD

Note: Either style may be installed in the

SV-1

™

, SV-3

™

or SV-4

™

valves

1 2 3 4 5 6

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