Emerson Y692VB Bedienerhandbuch PDF herunterladen (Seite 4)

Y692VB Series

between the equipment and the downstream shut-off

valve nearest to it. All pressure between these shut-off

valves is released through the open vent valve.

Maintenance

Vacuum breaker parts are subject to normal wear

and must be inspected and replaced as necessary.

Inspection frequency and replacement of parts

depends on the severity of service conditions,

applicable codes, government regulations, and

company standards.

WARNING

To avoid personal injury, property

damage, or equipment damage

caused by sudden release of pressure

or explosion of accumulated gas,

do not attempt any maintenance or

disassembly without rst isolating the

vacuum breaker from system pressure

and relieving all internal pressure.

Body Area

The following procedure is for gaining access to the

disk assembly, orice, and body gasket. Release all

pressure from the diaphragm case before performing

the following steps. Key numbers are referenced in

Figures 3 and 4.

1. To inspect and replace the disk holder assembly

(key 25) or orice (key 27), loosen the union nut

(key 19). Tip the diaphragm casing (key 20)

toward the outlet and separate it from the body

(key 28).

2. Remove and inspect the body gasket (key 16).

3. Inspect the orice (key 27) and replace it if

necessary. Lightly grease the orice threads and

install it using 29 to 37 foot-pounds (39 to 50 N•m)

of torque.

4. Remove the cotter pin (key 14) if it is necessary to

replace the disk holder assembly (key 25).

Note

The disk holder assembly (key 25) is

comprised of the disk and disk holder.

A washer (key 46) and machine screw

(key 47) are required to complete

the assembly.

5. Install the disk holder assembly (key 25). Use the

cotter pin (key 14) to secure it to the valve stem

(key 13).

6. If necessary, install a replacement body gasket

(key 16) into the body (key 28).

7. Slide the union nut (key 19) onto the diaphragm

casing (key 20) as far as it will go. Install both

halves of the split ring (key 17) into the slots of

the diaphragm casing and secure them by sliding

the union nut over the split ring.

8. Install the diaphragm casing (key 20) by tightening

the union nut (key 19) until the diaphragm casing

is secure on the body (key 28).

Diaphragm and Spring Case Area

This procedure is for gaining access to the control

spring, diaphragm assembly, valve stem, and stem

O-ring. Release all pressure from the diaphragm case

before performing the following steps.

Type Y692VB

Key numbers are referenced in Figure 3.

1. Remove the closing cap (key 3) and turn the

adjusting nut (key 2) counterclockwise until all

compression is removed from the control spring

(key 1). If the only further maintenance is to

change the control spring (key 1), skip to step 11.

2. Remove the cap screws (key 21) and hex nuts

(key 22) and lift off the spring case assembly

(key 23).

3. Remove the diaphragm (key 5) and attached parts

by tilting it so that the pusher post (key 8) slips

off the lever assembly (key 9). To separate the

diaphragm from the attached parts, unscrew the

diaphragm hex nut (key 37). If the only further

maintenance is to replace the diaphragm parts or

change the control spring (key 1), skip to step 8.

4. To replace the lever assembly (key 9), remove the

machine screws (key 11).

5. To replace the valve stem (key 13), perform Body

Area Maintenance procedure steps 1 through 4

and pull the valve stem out of the diaphragm casing

(key 20).

6. Install the valve stem (key 13) into the diaphragm

casing (key 20) and perform Body Area

Maintenance procedure steps 5 through 8.

1 2 3 4 5 6 7 8

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