3
Type FL
Figure 2.
Type FL Relief Valve or Backpressure Regulator Operational Schematic
Table 2.
Pilot Set Pressure Build Up
INLET PRESSURE
OUTLET PRESSURE
LOADING PRESSURE
ATMOSPHERIC PRESSURE
PORT B
EXHAUST
SPRING
CASE VENT
PORT A
PORT L
PORT S
PORT B
EXHAUST
SPRING
CASE VENT
PORT A
PORT L
PORT S
M1205
PILOT TYPE
SET PRESSURE CONTROL
RANGE, SPRING PART NUMBER
AND COLOR
SET PRESSURE
(1)
BUILD-UP OVER
SET PRESSURE
NEEDED TO BEGIN
OPENING VALVE
(2)
BUILD-UP 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
PRX/182
29 to 116 psig / 2.0 to 8.0 bar
GD25522X012
Black
30
2.1
1.2
0.08
2.8
0.19
1.0
0.69
60
4.1
1.7
0.12
3.7
0.26
1.0
0.69
80
5.5
1.9
0.13
4.0
0.28
1.0
0.69
100
6.9
2.8
0.19
5.0
0.35
1.0
0.69
73 to 290 psig / 5.0 to 20.0 bar
GD25520X012
Gold
75
5.2
2.3
0.16
5.1
0.35
2.1
0.14
100
6.9
2.5
0.17
5.9
0.41
2.1
0.14
150
10.3
3.5
0.24
6.8
0.47
2.1
0.14
200
13.8
4.0
0.28
8.0
0.55
2.1
0.14
250
17.2
4.0
0.28
8.9
0.61
2.1
0.14
217 to 609 psig / 15.0 to 42.0 bar
GD25519X012
Red
225
15.5
4.0
0.28
10.2
0.70
2.7
0.19
300
20.7
4.0
0.28
10.5
0.72
2.7
0.19
400
27.6
4.1
0.28
10.7
0.74
2.7
0.19
450
31.0
4.3
0.30
11.0
0.76
2.7
0.19
PRX-AP/182
435 to 1160 psig / 30.0 to 80.0 bar
GD27379X012
Clear
450
31.0
4.3
0.30
11.0
0.76
3.3
0.23
500
34.5
4.5
0.31
11.1
0.77
3.3
0.23
600
41.4
5.1
0.35
11.1
0.77
3.3
0.23
1050
72.4
5.1
0.35
11.1
0.77
3.3
0.23
1. Set Pressure is defi ned as the pressure at which the pilot starts-to-discharge.
2. Crack Point Pressure of the main valve of the inlet pressure build-up over the set pressure at which the main valve starts audible fl ow.
3. Inlet pressure build-up over the set pressure for the main valve to achieve wide-open fl ow capacity.
