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Type EZR
MaIn VaLVE
MaIn SPRIng PaRT
BODY SIZE,
nUMBER anD
nPS / Dn
COLOR CODE
19B2400X012, Light Blue
1 and 1-1/4 x 1 /
GE12727X012, Black
25 and 32 x 25
19B2401X012,
Black with White Stripe
19B2400X012, Light Blue
19B2401X012,
Black with White Stripe
2 x 1 / 50 x 25
GE12501X012,
Red Stripe
19B0951X012, Yellow
18B2126X012, Green
2 / 50
18B5955X012, Red
GE05504X012, Purple
T14184T0012, Yellow
3 / 80
19B0781X012, Light Blue
19B0782X012, Black
T14184T0012, Yellow
4, 6 x 4 and, 8 x 4 /
100, 150 x 100
18B8501X012, Green
and 200 x 100
18B8502X012, Red
19B0364X012, Yellow
6, 8 x 6 and
12 x 6 /
150, 200 x 150
19B0366X012, Green
and 300 x 150
19B0365X012, Red
GE09393X012, Yellow
8 / 200
GE09396X012, Green
GE09397X012, Red
1. See Table 1 for structural design ratings, Table 3 for pilot ratings and Table 10 for maximum pressure ratings.
2. The white and yellow springs are only recommended for inlet pressures under 100 psig / 6.9 bar.
3. The red, black, purple, red stripe and black with white stripe springs are only recommended for applications where the maximum inlet pressure can exceed 500 psig / 34.5 bar.
4. 18B5955X012 (Red) is used on constructions with travel indicator while GE05504X012 (Purple) is used on non-travel indicator constructions.
Principle of Operation
As long as the outlet (control) pressure is above the
outlet pressure setting, the pilot valve plug or disk
remains closed (Figure 2). Force from the main spring,
in addition to inlet pressure bleeding through the
Type 112 restrictor (the restrictor is integral in the
PRX Series pilots), provides downward loading
pressure to keep the main valve diaphragm and plug
assembly tightly shutoff.
When the outlet pressure decreases below the pilot
outlet pressure setting, the pilot plug or disk assembly
opens. Loading pressure bleeds downstream through
the pilot faster than it can be replaced through the
Type 112 restrictor. This reduces loading pressure on
4
Table 4. Main Valve Minimum Differential Pressures
DIaPHRagM
MaTERIaL
17E68 and 17E88
17E97
17E68 and 17E88
17E88 and 17E97
(3)
17E68 and 17E88
17E97
17E68 and 17E88
17E97
(3)
17E68 and 17E88
(2)
17E97
17E68 and 17E88
(3)(4)
17E88 and 17E97
(3)(4)
17E68 and 17E88
(2)
17E97
17E68 and 17E88
17E88 and 17E97
(3)
17E68 and 17E88
(2)
17E97
17E68 and 17E88
17E88 and 17E97
(3)
17E97
(2)
17E88
17E97
17E88
17E88 and 17E97
(3)
(2)
17E97
(3)
MInIMUM DIFFEREnTIaL, PERCEnT OF CagE CaPaCITY
FOR 90% CaPaCITY
100% Trim
60% Trim
30% Trim
psi
bar
psi
bar
psi
24
1.7
29
2.0
31
35
2.5
38
2.7
42
30
2.1
35
2.4
39
43
3.0
50
3.4
56
24
1.7
29
2.0
31
43
3.0
50
3.4
56
43
3.0
50
3.4
56
68
4.7
73
5.0
88
12
0.83
15
1.0
15
24
1.7
25
1.7
26
18
1.2
20
1.4
22
29
2.0
29
2.0
31
16
1.1
19
1.3
24
23
1.6
23
1.6
23
21
1.5
22
1.5
28
32
2.2
33
2.3
43
10
0.69
12
0.83
14
16
1.1
17
1.2
21
16
1.1
17
1.2
20
21
1.5
24
1.7
26
10
0.69
11
0.76
14
10
0.69
13
0.90
13
14
0.97
22
1.5
22
17
1.2
21
1.5
21
23
1.6
29
2.0
29
16
1.1
20
1.4
- - - -
- - - -
26
1.8
top of the main valve diaphragm and plug assembly.
The force imbalance on the diaphragm allows the inlet
pressure to overcome the loading pressure and main
spring force and open the Type EZR diaphragm and
plug assembly.
As the outlet pressure rises toward the outlet pressure
setting, it compresses the pilot diaphragm against the
pilot control spring and allows the pilot valve plug or
disk close. Loading pressure begins building on the
Type EZR diaphragm and plug assembly. The loading
pressure, along with force from the main spring,
pushes the diaphragm and plug assembly onto the
tapered-edged seat, producing tight shutoff.
(1)
FOR 100% CaPaCITY
100% Trim
60% Trim
bar
psi
bar
psi
bar
2.2
24
1.7
31
2.2
2.9
35
2.5
39
2.7
2.7
30
2.1
36
2.5
3.9
43
3.0
53
3.7
2.2
24
1.7
31
2.2
3.9
43
3.0
53
3.7
3.9
43
3.0
53
3.7
6.1
72
5.0
81
5.6
1.0
12
0.83
25
1.7
1.8
24
1.7
30
2.1
1.5
19
1.3
26
1.8
2.1
31
2.1
35
2.4
1.7
23
1.6
23
1.6
1.6
23
1.6
23
1.6
1.9
28
1.9
28
1.9
3.0
38
2.6
38
2.6
0.97
25
1.7
25
1.7
1.5
34
2.3
34
2.3
1.4
30
2.1
30
2.1
1.8
40
2.8
40
2.8
0.97
12
0.83
16
1.1
0.90
12
0.83
21
1.5
1.5
19
1.3
29
2.0
1.5
20
1.4
36
2.5
2.0
30
2.1
41
2.8
19
1.3
23
1.6
- - - -
30
2.1
30% Trim
psi
bar
40
2.8
52
3.6
52
3.6
68
4.7
40
2.8
68
4.7
68
4.7
102
7.0
20
1.4
37
2.6
28
1.9
43
3.03
29
2.0
25
1.7
33
2.3
50
3.4
25
1.7
34
2.3
30
2.1
40
2.8
16
1.1
21
1.5
29
2.0
36
2.5
41
2.8
- - - -
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