Type ACE97
11
Table 9. Diagnostics Table: C
v
20 through 60, Inlet Pressure Range Spring 25 to 50 psig / 1,7 to 3,4 bar
ACTUAL INLET SUPPLY
PRESSURE TO VALVE
DIAGNOSTIC PORT PRESSURE
Pressure when Pilot Starts to Open Pressure when Main Valve Starts to Open Pressure when Main Valve is Fully Open
psig bar psig bar psig bar psig bar
25 1,7 24 1,7 16 1,1 5 0,21
30 2,1 29 2,0 20 1,4 9 0,62
35 2,4 34 2,3 24 1,6 14 0,96
40 2,8 39 2,7 29 2,0 18 1,2
45 3,1 44 3,0 33 2,2 23 1,6
50 3,4 49 3,4 38 2,6 27 1,9
Table 10. Diagnostics Table: C
v
20 through 60, Inlet Pressure Range Spring 51 to 120 psig / 3,5 to 8,3 bar
ACTUAL INLET SUPPLY
PRESSURE TO VALVE
DIAGNOSTIC PORT PRESSURE
Pressure when Pilot Starts to Open Pressure when Main Valve Starts to Open Pressure when Main Valve is Fully Open
psig bar psig bar psig bar psig bar
51 3,5 50 3,4 39 2,7 11 0,76
60 4,1 59 4,1 48 3,3 19 1,3
70 4,8 69 4,8 57 3,9 28 1,9
80 5,5 79 5,4 66 4,5 37 2,5
90 6,2 89 6,1 75 5,2 46 3,2
100 6,9 99 6,8 84 5,8 55 3,8
110 7,6 109 7,5 93 6,4 64 4,4
120 8,3 119 8,2 102 7,0 73 5,0
Table 11. Diagnostics Table: C
v
20 through 60, Inlet Pressure Range Spring 121 to 200 psig / 8,3 to 13,8 bar
ACTUAL INLET SUPPLY
PRESSURE TO VALVE
DIAGNOSTIC PORT PRESSURE
Pressure when Pilot Starts to Open Pressure when Main Valve Starts to Open Pressure when Main Valve is Fully Open
psig bar psig bar psig bar psig bar
121 8,3 120 8,3 103 7,1 60 4,1
130 9,0 129 8,9 111 7,6 68 4,7
140 9,6 139 9,6 120 8,3 77 5,3
150 10,3 149 10,3 129 8,9 86 5,9
160 11,0 159 10,9 138 9,5 95 6,5
170 11,7 169 11,7 147 10,1 104 7,2
180 12,4 179 12,3 156 10,8 113 7,8
190 13,1 189 13,0 165 11,4 122 8,4
200 13,8 199 13,7 174 12,0 134 9,2
Annual Maintenance
1. Visually inspect the unit to ensure tight
connections, tight seals, and safe operation.
2. Observe the pad and depad (tank blanketing
and vapor recovery) pressures.
3. Inspect the inlet pressure for the proper 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.
Pad Valve Diagnostics
Note
A pressure gauge must be installed
in the pad valve diagnostic port to
perform diagnostic analysis. See
Figures 2 through 4.
Diagnostics are an optional feature of the NPS 1 and 2
/ DN 25 and 50 Type ACE97 valves and aid in evaluating
valve operation. The diagnostic analysis relies on the
relationship of pad valve pilot pressure and the inlet
pressure of the pad valve. The basic relationships
(20 pages)
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