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
(1 pages)
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