Watts 530C User Manual
For Commercial, Institutional and Industrial Applications
ES-530C
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Series 530C
Calibrated Pressure Relief Valves
Sizes: 1⁄2" or 3⁄4" (15 or 20mm)
Series 530C Calibrated Pressure Relief Valves are spring
operated brass valves designed for use only as protection
from the build up of excessive pressure in systems containing water, oil or air. Series 530C valves incorporate a calibrated adjustment feature for setting the valve to the relief
pressure required. These valves are ideally suited for bypass
thermal expansion relief.
Features
• Calibrated adjustment feature for setting valve to relief
pressure required
• Adjustable range 50 – 175psi (3.4 – 12.1 bar)
• All brass construction
• All stainless steel spring
• Buna-N disc on machined body seat
• Inlet (bottom), male NPT threaded
• Outlet (side), female NPT threaded
Pressure – Temperature
Maximum Temperature: 180°F (82°C)
Spring Ranges
1
⁄2" or 3⁄4" (15 or 20mm): 50 – 175psi (3.4 – 12.1 bar)
3
⁄4" (20mm): 100 – 300psi (6.9 – 20.7 bar)
Application Note: The Watts Series 530C are not ASME
approved safety relief valves and should not be used in system application with this requirement.
3
⁄4"
(20mm)
1
⁄2"
(15mm)
X = Set Point Flow
0 5 10 15 20 25 30 35 40 gpm
19 38 57 76 95 114 133 152 lpm
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
Capacity (530C)
2
7
6
5
4
3
1
Model 530C
MODEL SIZE (DN) DIMENSIONS WEIGHT
Height Width
in. mm in. mm in. mm lbs. kg.
530C1⁄2 or 3⁄4 15 or 20 3 76 15⁄8 41 .37 0.17
Materials
1. Body Brass
2. Bonnet Brass
3. Disc Holder Brass
4. Disc Buna-N (Nitrile)
5. Adjustable Spring Stainless Steel
6. O-ring Buna-N (Nitrile)
7. Spring Washer Brass
Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without
prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
ES-530C 0630 ©Watts Regulator Company, 2006
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.watts.com
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca
Water Safety & Flow Control Products
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