Watts 5300A User Manual
Series 530c, Calibrated pressure relief valves, Series 53
Dimensions
Size (DN)
Height
Width
Weight
Model
in.
mm
in.
mm
in.
mm
lbs.
gm.
53
1
⁄
2
or
3
⁄
4
15 or 20 2
7
⁄
8
73
1
3
⁄
4
44
.5
227
Series 530C
Calibrated Pressure Relief Valves
Features
• Calibrated adjustment feature for setting valve to relief
pressure required
• Adjustable range 50 - 175 psi (3.45 - 12.06 bars)
• All bronze construction
• All stainless steel springs
• Buna-N disc on machined body seat
Specifications
• Sizes
1
⁄
2
" and
3
⁄
4
" (15 & 20mm)
• Inlet (bottom) male threaded, NPT
• Outlet (side), female threaded, NPT
Design
• The Watts Series 530C are spring operated bronze relief
valves designed to be used only as protection from the build
up of excessive pressure in systems containing water, oil or air.
• The Watts Series 530C are not ASME approved safety
relief valves and should not be used in system applica-
tions with this requirement.
• Incorporate a calibrated adjustment feature for
setting the valve to the relief pressure required.
Application
• Ideally suited for bypass thermal expansion pressure relief
• Not an ASME approved safety relief valve
Temperature & Pressure
Maximum Pressure: 300 psi (20.67 bars)
Maximum Temperature: 180
°
F (82
°
C)
Spring Ranges Available
Size
1
⁄
2
" or
3
⁄
4
": 50 - 175 psi (3.45 - 12.06 bars)
Size
3
⁄
4
": 100 - 300 psi (6.89 - 20.67 bars)
ES-530C
Job Name ______________________________________________
Contractor ______________________________________________
Job Location ___________________________________________
Approval ________________________________________________
Engineer _______________________________________________
Contractor’s P.O. No. ____________________________________
Approval _______________________________________________
Representative __________________________________________
For Residential, Commercial and Industrial Applications
Dimensions
Size (DN)
Height
Width
Weight
Model
in.
mm
in.
mm
in.
mm
lbs.
gm.
530C
1
⁄
2
or
3
⁄
4
15 or 20
3
76
1
5
⁄
8
41
.63
286
0
5
10
15
20
25
30
35
40 gpm
19
38
57
76
95
114
133
152 lpm
Capacity (530C)
X = Set Point
1
⁄
2
",
3
⁄
4
"
(13,19mm)
psi bars
300 20.7
275 18.9
250 17.2
225 15.5
200 13.8
175 12.1
150 10.3
125
8.6
100
6.9
75
5.2
50
3.4
25
1.7
Inlet Pressure
1
⁄
2
",
3
⁄
4
"
(13,19mm)
Flow
No.
Part
Material
1
Body
Bronze casting
2
Bonnet
F.C. brass
3
Disc Holder
F.C. brass
4
Disc
Buna-N
5
Adjustable Spring
Stainless steel
6
O-Ring
Buna-N
7
Spring Washer
Sheet brass
Watts product specifications in U.S. customary units and metric are ap-
proximate and are provided for reference only. Watts reserves the right to
change or modify product design, construction, specifications, or materi-
als without prior notice and without incurring any obligation to make
such changes and modifications on Watts products previously or subse-
quently sold.
Series 53
Pressure Relief Valve
For pressure relief only, furnished without a test
lever. For test lever see Model 53L on back. Male
inlet sizes
1
⁄
2
" and
3
⁄
4
" have
1
⁄
2
" female drain. Pres-
sure range 75-175 psi (5.17-12.06 bars). Standard
settings 75, 125, and 150 psi (5.17, 8.61 and
10.34 bars). Also, specially available at 50 psi
(3.45 bars) setting.
7
3
2
6
5
4
1