Emerson ACE95Sr Instruction Manual download pdf (Page 6)

ACE95 Series

Diagnostics are an optional feature of the ACE95 Series

Tank Blanketing valves that aid in evaluating valve

operation. The diagnostic analysis relies on the

relationship of pilot pressure and pressure in the main

valve chambers (see Figure 3). The basic relationships

are as follows:

In order to evaluate a valve, examine the valve

nameplate to determine the C

and inlet pressure

range main valve spring. The inlet pressure gauge

indicates actual pressure supplied to the valve.

Follow these steps and refer to the diagnostics tables

on the following pages to evaluate a valve under

actual operating conditions:

1. Select the Table (Tables 3 through 8) that

corresponds to the C

and inlet pressure range of

your valve.

2. Determine the actual valve operating inlet

pressure in the rst column of the diagnostics table.

3. In the second column of the table, determine the

pressure of the pilot as it opens.

4. Determine the diagnostic pressure for the start to

open pressure of the main valve in the third column.

5. The fourth column displays the diagnostic

pressure for the full open pressure of the main valve.

There are four pressures involved in evaluating a

valve: actual inlet pressure, pressure to start opening

pilot valve, pressure to start opening main valve, and

pressure to fully open main valve.

: The gas pressure supplied

to the inlet of the valve. This is the maximum

diagnostic pressure.

: The

diagnostic pressure drops to this value as the valve

senses decreasing tank pressure. The main valve

remains closed at this pressure.

: The

diagnostic pressure drops to this level as the tank

pressure decreases and reaches the valve setpoint.

The pilot is fully open at this pressure.

: At this point,

both the main valve and pilot valve are fully open and

supplying gas to the tank.



Valve 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 the requirements

of local, state, and federal regulations. Due to the

care Emerson

takes in meeting all manufacturing

requirements, use only replacement parts

manufactured or furnished by Emerson.

All O-rings, gaskets, and seals should be lubricated with

a good grade of general purpose lubricant and installed

gently rather than forced into position. Suggested

lubricant, sealant, and adhesive are as follows:

: Dow Corning

111 or equivalent

: Loctite

PST #592,

Polytetrauoroethylene (PTFE) Tape or equivalent

: Loctite #222 or equivalent

Be certain that nameplates are updated to accurately

indicate any eld changes in equipment, materials,

service conditions, or pressure settings.

Monthly Maintenance

1. Visually inspect the unit to ensure tight connections,

tight seals, and safe operation.

2. Observe the blanketing pressure.

3. Inspect the inlet pressure for the proper pressure

range (stamped on the valve nameplate).

Annual Maintenance

1. Visually inspect the unit to ensure tight connections,

tight seals, and safe operation.

 2. Observe the blanketing pressure.

3. Inspect the inlet pressure for the proper pressure

range (stamped on the valve nameplate).

4. Visually inspect valve for any external wear.

5. If there is evidence of leakage or unstable

internal motion, a rebuild with seal replacement

and relubrication may be in order.







Equal to inlet supply pressure

Pilot and main valves are closed.

Tank at or above set pressure.

Slightly below inlet supply pressure

Pilot valve supplies gas to tank.

Tank pressure is just below

set pressure.

Well below inlet supply pressure

Pilot and main valves are both

supplying gas to the tank. Tank

pressure is below setpoint.

Table 2. Diagnostic Analysis Pressure Ranges

1 2 3 4 5 6 7 8 9 10 11 ... 15 16

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Emerson ACE95Sr Instruction Manual Page 6

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