Series 820Direct Acting Steam PRV
SPECIFICATIONS
Diaphragm chamber
Grey iron, ductile iron or steel construction.Standard sizes: 6", 8", 10" and 15", according to required response (sensitivity).
Bonnet
Provides support to diaphragm and guides valve spring.
Spring
Heat treated and color codified to offer optimum response and broad calibration range.
Gasket Teflon gasket minimizes friction for stem smooth vertical movement and assures zero-leakage.
Bonnet supportLateral orifices allow rapid extraction from body to check sealing surfaces.
Metal disc
Stainless steels, smoothed surfaces to assure optimum seal in gases or steam.
SeatSmoothed stainless steel, high erosion resistance to ensure long operating life.
BodyIron or steel forged body for heavy duty. Flanged connection may be manufactured upon client request.
GENERAL INFORMATION
MODEL SIZE CONNECTIONS BODY MATERIAL
TRIM MATERIAL
MAX.INLET PRESSURE
MAX. TEMP
821
822
823
1" - 3 "
1" - 3 "
1" - 3 "
Threaded NPT
ANSI 150 #
ANSI 300 #
Iron ASTM A126
Steel ASTM A216 Steel ASTM A216
Steel Inox: AISI304
Steel Inox: AISI304
Steel Inox: AISI304
250
250
300
308 ℉
350 ℉
120 ℉
Main Advantages
1. Compact, durable design for higher flow requirements.2. Range of sizes after required sensitivity.3. Serviciable in line.4. Quality assurance:5. Metalography, spectometry and individual hydrostatic and leakage testing.6. Complete product traceability through test register in product data sheet.
OPERATING PRINCIPLE
Steam passes through pilot line until it reaches actuation chamber were it condenses, filling the chamber and pilot line up to siphon, thus outlet pressure (P2) is communicated to diaphragm.
Inlet pressure (P1) is regulated to outlet pressure (P2) by positioning metal disc to seat depending on required demand.
FOR CERO FLOW
When outlet pressure (P2) is at its maximum, spring compresses forcing metal disc descent until complete seal is achieved.
FOR MAXIMUN FLOW
When outlet pressure (P2) is at its minimum, force of spring is greater than force generated by diaphragm, therefore complete lift of metal disc is obtained.
MODULATING FLOW
Spring force is greater than intermediate pressure between maximum and minimum range. To minimize variation a bigger diaphragm chamber and a black spring is selected.
3
Actuation chamber
siphon
Spring force
Spring
Pilot line
Needle valve
Apparatus line
Seat
Disc
P2
P2
P1
Regulator sizing and selection must not be subject to piping size, as it depends on required capacity and differential pressure .
Cv is the accepted terminology to define the capacity of any valve. Cv is the quantity of water in GPM that passes through the valve for a 1 PSI decrease in pressure through the valve. The following Cv correspond to the standard 820 series valve sizes:
SIZING
Valve capacity increases as regulated pressure decreases. As valve reaches full flow capacity regulating in greater deviation from set point pressure (P2). Valve capacity should considered according to process flow to minimize mendored deviation.
Example: Point on the graph shows that a pressure 1(Droop) of 4.5 PSI will occur when a 1 1/2" regulator valve with a 10" chamber is working at full capacity (Cv). In the other hand, a decrease in regulated pressure (Droop) of 1.5 PSI will occur when the same valve is working at 50% capacity (point ).
CAPACITY CV
DRO
OP P
SI
1
1
2
SIZE 1" 2" 3"
Cv 10 20
With the use of the following formulas, and using the Cv value as input, valve capacity for steam can be calculated:
4
25 40 50
CRITICAL FLOW
Capacity "W" is defined as:
In these conditions flow is throttled and outlet pressure (P2) does not affect flow.
SUBCRITICAL FLOW
When outlet pressure (P2) increases, flow reduces and when outlet pressure (P2)
decreases flow increases.
Capacity "W" is defined as:
P2 ≤ ½ P1 P2 ≥ ½ P1
Body material Connections Chamber Spring
820
Iron ASTM A126
Steel ASTM A216 Steel ASTM A216
821822
821
822
823
Class Cód. Kind Cód.
NPI
ANSI 125#
ANSI 250#
ANSI 150#
ANSI 300#
11
5
4
3
2
1
2
3
4
6"
8"
10"
15"
150
100
200
250
300
Cód.Thread NPT
1"
1½
2"
2½
3"
Size Cód. Color Cód.
Green
Black
V
N
Wmax. = Cv (P + 14,7) 0.547
= Cv (P + 14,7) W MAX. = 2,1Cv 1 2 P( P + P )
Size
PRODUCT ID REFERENCE GUIDE
820 series regulator valve
Pressure gauge (P2)
Pressure gauge (P2)
steam trap
Safety relief valve
INSTALLATION
1"½ 2"½
CHAMBER AND SPRING SELECTION
1"Chamber & green
color springChamber & black
color spring
Inlet pressure
6" 8" 6" 8"Regulated Pressure (PSIG)
Min. Min. Min. Min.Max. Max. Max. Max.
20
37
34
25
25
148
145
120
97
152
29
26
23
17
34 74
70
67
63
59
28
26
23
21
17
67
64
62
58
57
12
11
9
8
7
32
30
29
28
27100
200
175
150
125
Green Spring
6" chamber
8" chamber
Black Spring
8" chamber
6" chamber
Chamber & green color spring Chamber & black color spring 1½ "
6" 8" 10" 6" 8" 10"
Regulated Pressure (PSIG)
Green Spring Black Spring
Inlet pressure
32
38
44
50
97
108
112
117
12
15
18
21
58
60
63
65
6
8
9
10
20
20
22
23
35
40
47
54
84
89
94
100
16
19
21
25
37
40
42
45
5
7
8
9
13
15
16
18
Chamber & green color spring Chamber & black color spring 2 "
6" 8" 10" 6" 8" 10"
Regulated Pressure (PSIG)Inlet pressure
56
65
72
79
86
98
120
145
149
153
20
24
27
30
34
42
46
50
54
58
10
13
15
18
21
25
27
30
33
35
35
42
50
57
59
69
76
82
89
95
17
21
24
28
30
36
40
43
47
49
15
18
22
25
28
33
36
39
43
46
8" chamber
6" chamber
10" chamber10" chamber
8" chamber
6" chamber
Cv
Cv
100
125
175
150
200
10" chamber
6" chamber
8" chamber
10" chamber
8" chamber
6" chamber
Green Spring Black Spring
5
Cv Cv
Cv Cv
125
150
100
175
6
Chamber & green color spring Chamber & black color spring2½ " 6" 8" 10"
Regulated Pressure (PSIG)Inlet pressure
CHAMBER AND SPRING SELECTION
6" 8" 10"8" 10" 15" 15"10"8"6"
min. max min. min. min. min. min. min. min.max max max max max max max
56
65
72
79
98
120
145
149
19
24
28
34
44
48
53
58
25
20
30
35
35
40
45
50
4
10
12
14
8
16
18
20
33
41
50
59
64
71
79
87
16
20
25
29
27
24
31
34
15
19
23
27
29
32
36
41
4
5
7
8
7
8
10
11
86 154 43 62 40 55 16 22 68 95 34 37 31 46 9 12
Chamber & green color spring Chamber & black color spring3 " 6" 8" 10"
Regulated Pressure (PSIG)Inlet pressure
6" 8" 10"8" 10" 15" 15"10"8"6"
min. max min. min. min. min. min. min. min.max max max max max max max
40
51
62
71
71
82
93
103
27
34
41
50
46
53
60
67
41
33
49
58
48
56
64
73
12
15
18
21
17
20
23
26
45
55
67
78
60
69
79
100
35
43
48
55
51
44
59
65
36
45
54
61
64
75
86
96
16
20
23
27
22
26
30
34
79 115 60 74 66 81 24 29 96 115 62 72 69 107 30 38
15" chamber
10" chamber
8" chamber
6" chamber
15" chamber
10" chamber
8" chamber
6" chamber
Green Spring Black Spring
Cv Cv
Cv Cv
Green Spring Black Spring
100
125
150
175
200
100
125
150
175
200
100
125
150
175
200
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