Emerson Y695VR Bedienerhandbuch PDF herunterladen (Seite 3)

Y695VR Series

WARNING

Equipment operation within ratings does not preclude

the possibility of damage from debris in the lines

or from external sources. This equipment should

be inspected for damage periodically and after any

overpressure condition.

Note

If this equipment is shipped mounted on

another unit, install that unit according

to the appropriate instruction manual.

1. Only personnel qualied through training and

experience should install, operate, and maintain

this equipment. For Y695VR Series equipment

that is shipped separately, make sure that there is

no damage to or foreign material in it. Also

ensure that all tubing and piping have been

blown free.

2. This equipment may be installed in any position

as long as the ow through the body is in the

direction indicated by the arrow attached to

the body. If continuous operation is required

during inspection or maintenance, install a

threeway bypass valve around the equipment.

This equipment may vent some gas

to the atmosphere. In hazardous or

ammable gas service, vented gas may

accumulate and cause personal injury,

death, or property damage due to re or

explosion. Vent equipment in hazardous

gas service to a remote, safe location

away from air intakes or any hazardous

area. The vent line or stack opening

must be protected against condensation

or clogging.

Principle of Operation

The Y695VR Series vacuum regulators (Figure 2)

are used to maintain a constant vacuum at the

regulator inlet. A decrease in this vacuum (increase

in absolute pressure) beyond this value registers on

the diaphragm and opens the disk. This permits a

downstream vacuum of lower absolute pressure than

the upstream vacuum to restore the upstream vacuum

to its original pressure setting. On the Type Y695VR,

pressure registers underneath the diaphragm. The

Type Y695VRM has a control line connecting the

diaphragm casing to the vacuum line and an O-ring

stem seal blocking the throat.

Startup and Adjustment

All Y695VR Series equipment can be placed in

operation by slowly introducing inlet vacuum or

pressure. This equipment takes control when control

vacuum is established. This equipment is suitable for

the pressure range stamped on the nameplate

(key 46).

Shutdown

First close the nearest upstream shutoff valve and then

close the nearest downstream shutoff valve to vent

the equipment properly. Next, open the vent valve

between the equipment and the downstream shutoff

valve nearest to it. All pressure between these shutoff

valves is released through the open vent valve.

Maintenance

Equipment parts are subject to normal wear and must

be inspected and replaced as necessary. The

frequency of inspection and replacement of parts

depends on the severity of service conditions and

upon applicable codes and government regulations.

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 regulator from

system pressure and relieving all internal

pressure from the equipment.

Body Area

These procedures are for gaining access to the disk

assembly, and body gasket. All pressure must be

released from the diaphragm case before the following

steps can be performed.

Key numbers are referenced in Figures 3 and 4.

1. To inspect and replace the disk holder assembly

(key 13), remove the body cap assembly (key 43).

2. If it is necessary to replace the disk holder

assembly (key 13), remove it from the disk spacer

(key 44).

3. To inspect and replace the orice (key 5) or throat

seal (key 31) and machine screw (key 33),

remove the cap screws (key 2), and separate the

diaphragm casing (key 4) from the body (key 1).

1 2 3 4 5 6 7 8

Y695VR Series 1

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