Annual Maintenance; Disassembly And Assembly - Emerson Fisher ACE95 Series Instruction Manual

Table 3. Type ACE95 Diagnostics Table: C
ACTUAL INLET SUPPLY
PRESSURE TO VALVE,
psig / bar
25 / 1.7
30 / 2.1
35 / 2.4
40 / 2.8
45 / 3.1
50 / 3.4
Table 4. Type ACE95 Diagnostics Table: C
ACTUAL INLET SUPPLY
PRESSURE TO VALVE,
psig / bar
51 / 3.5
60 / 4.1
70 / 4.8
80 / 5.5
90 / 6.2
100 / 6.9
110 / 7.6
120 / 8.3

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.

Disassembly and Assembly

Before removing the valve from the line,
ensure that it is isolated from the gas
supply pressure and that all pressure
has been released from the valve. (The
drain on the inlet filter is convenient
to bleed off gas.) All tank connections
must be closed or sealed in accordance
with your plant's operating and safety
procedures. If installed, electrical
connections to the explosion proof
switch must be deactivated before
1 through 4, Inlet Pressure Range Spring 25 to 50 psig / 1.7 to 3.4 bar
v
When Pilot Starts to Open,
psig / bar
24 / 1.7
29 / 2.0
34 / 2.3
39 / 2.7
44 / 3.0
49 / 3.4
1 through 4, Inlet Pressure Range Spring 51 to 120 psig / 3.5 to 8.3 bar
v
When Pilot Starts to Open,
psig / bar
50 / 3.4
59 / 4.1
69 / 4.8
79 / 5.4
89 / 6.1
99 / 6.8
109 / 7.5
119 / 8.2
CAUTION
DIAGNOSTIC PORT PRESSURE
When Main Valve Starts to Open,
psig / bar
9 / 0.62
13 / 0.90
16 / 1.1
20 / 1.4
24 / 1.7
28 / 1.9
DIAGNOSTIC PORT PRESSURE
When Main Valve Starts to Open,
psig / bar
29 / 2.0
36 / 2.5
43 / 3.0
51 / 3.5
59 / 4.1
66 / 4.6
74 / 5.1
81 / 5.6
opening the enclosure or disconnecting
the wiring (in accordance with codes
and safety practices).
It is recommended that all seals and diaphragms be
replaced as a matter of good practice whenever a
valve is disassembled and re-assembled. Parts kits
are available through your local Sales Office.
If you are performing disassembly or assembly operations
on a Type ACE95Sr valve, refer to the Parts List and see
Figure 9. If you are working on a Type ACE95 valve, refer
to the Parts List and see Figure 8.
Have your model number, serial number,
inlet pressure and set pressure range,
C value, and tank vent/relief setting
v
available when ordering parts. Valve
information is on the nameplate (on the
upper actuator case).
Disassembly
!
To avoid personal injury resulting from
sudden release of pressure, isolate the
valve from all pressure and cautiously
release trapped pressure from the pilot
or valve before attempting disassembly.
ACE95 Series
When Main Valve is Fully Open,
psig / bar
2 / 0.14
6 / 0.41
9 / 0.62
13 / 0.90
17 / 1.2
21 / 1.4
When Main Valve is Fully Open,
psig / bar
5 / 0.35
12 / 0.83
19 / 1.3
27 / 1.9
34 / 2.3
42 / 2.9
50 / 3.4
57 / 3.9
Note
WARNING
7