720A720A½”-2”½”-2”

Modification OverviewModification Overview Production of the 720A began in 1984 and Production of the 720A began in 1984 and

is current.is current.

In 2010 the test cocks were moved from In 2010 the test cocks were moved from the body to the inlet and outlet shutoff the body to the inlet and outlet shutoff valves.valves.

Canopy RemovalCanopy Removal The canopy is The canopy is

secured by three secured by three screws.screws.

Bonnet Removal Bonnet Removal The bonnet is The bonnet is

threaded into the threaded into the body and sealed by body and sealed by an o-ring and a plastic an o-ring and a plastic washer.washer.

Unscrew the bonnet Unscrew the bonnet counter clockwise.counter clockwise.

There is no spring There is no spring load.load.

Float Poppet Removal Float Poppet Removal The float is free once The float is free once

the bonnet has been the bonnet has been removed.removed.

Float Poppet ServiceFloat Poppet Service To replace the upper To replace the upper

disc, unscrew the disc, unscrew the guide stem from the guide stem from the poppet.poppet.

Check Valve Spring RemovalCheck Valve Spring Removal The check spring is The check spring is

held in place by a held in place by a groove in the body.groove in the body.

Work the spring until Work the spring until it clears the body and it clears the body and lift out.lift out.

Check Disc ReplacementCheck Disc Replacement AKA spider assembly.AKA spider assembly. The check poppet is The check poppet is

free once the spring is free once the spring is removed.removed.

The disc is free once The disc is free once the screw and guide the screw and guide are removed.are removed.

Check Seat ReplacementCheck Seat Replacement The check seat is part The check seat is part

of the body.of the body. If the seat is damaged If the seat is damaged

the assembly must be the assembly must be replaced.replaced.

Reassembly NotesReassembly Notes Reassemble in Reassemble in

reverse order.reverse order. Place the small end of Place the small end of

spring down in the spring down in the body.body.

Make sure the large Make sure the large end of the spring is end of the spring is secured in the body secured in the body groove.groove.

Lubricate the bonnet Lubricate the bonnet o-ring.o-ring.