Data Sheet

Bulletin 71.4:LR128
8
Table 4. Build-up Pressure Needed to Begin Opening and Fully Open Main Valve and Pressure Drop Needed to Reseat Pilot
SPRING RANGE SPRING,
PART NUMBER AND
SPRING COLOR
SET PRESSURE
(1)
BUILDUP OVER SET
PRESSURE NEEDED TO
BEGIN OPENING OF
MAIN VALVE
(2)
BUILDUP OVER SET
PRESSURE NEEDED TO
FULLY OPEN
MAIN VALVE
(3)
PRESSURE DROP BELOW
SET PRESSURE NEEDED
TO RESEAT PILOT
psig bar psig bar psig bar psig bar
25 to 75 psig / 1.7 to 5.2 bar
ERAA01910A0
(Green)
25 1.7 1 0.07 1 0.07 2 0.14
50 3.4 1 0.07 1 0.07 2 0.14
75 5.2 1 0.07 6 0.41 2 0.14
70 to 140 psig / 4.8 to 9.7 bar
ERAA01911A0
(Red)
70 4.8 1 0.07 4 0.28 5 0.34
100 6.9 1 0.07 10 0.69 5 0.34
125 8.6 1 0.07 13 0.90 5 0.34
140 9.7 1 0.07 16 1.1 5 0.34
130 to 200 psig / 9.0 to 13.8 bar
ERAA02889A0
(Blue)
130 9.0 1 0.07 14 0.97 6 0.41
150 10.3 1 0.07 14 0.97 6 0.41
175 12.1 1 0.07 17 1.2 6 0.41
200 13.8 1 0.07 17 1.2 6 0.41
150 to 375 psig / 10.3 to 25.9 bar
1N943427142
(Unpainted)
150 10.3 1 0.07 9 0.62 7 0.48
200 13.8 1 0.07 10 0.69 7 0.48
250 17.2 1 0.07 11 0.76 7 0.48
300 20.7 1 0.07 15 1.03 7 0.48
350 24.1 1 0.07 15 1.03 7 0.48
375 25.9 1 0.07 25 1.7 7 0.48
1.Setpressureisdenedasthepressureatwhichthepilotstarts-to-discharge.
2.Crackpointpressureofthemainvalveoftheinletpressurebuildupoverthesetpressureatwhichthemainvalvestartsaudibleow.
3.Inletpressurebuildupoverthesetpressureforthemainvalvetoachievewide-openowcapacity.
Figure 4. Cavitation Sizing for Water
CAVITATION PREDICTION
OUTLET PRESSURE (P2)
psig / bar
375 /
26.0
335 /
23.1
295 /
20.3
450 /
31.0
405 /
27.9
360 /
24.8
315 /
21.7
270 /
18.6
225 /
15.5
180 /
12.4
135 /
9.3
255 /
17.6
215 /
14.8
175 /
12.1
135 /
9.3
95 /
6.6
55 /
3.8
15 /
1.0
90 /
6.2
45 /
3.1
0
INLET PRESSURE (P1)
psig / bar
CONTINUOUS SERVICE REGION
INTERMITTENT SERVICE REGION
FULL CAVITATION REGION