Circle Valve Technologies Inc.
1533 Gehman Road
Harleysville, PA 19438

Toll Free:800-645-6733
Phone: 267-933-6300
Fax: 267-933-6305
Email: [email protected]
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Features
  • Popoff or inline valves
  • Adjustable crack pressure
  • Zero leakage
  • Accurate set pressure
  • Tamper-proof adjustment
  • 100% seat leakage tested
  • PED certifications and CE marking available for most models
Circle Seal Relief Valve 500 Series Popoff
Unit of Measure
Items Circle Seal Aluminum Relief Valve 500 Series
D520A-2M
Popoff Valves
List Price QUOTE
 Circle Seal Aluminum Relief Valve 500 Series
D520A-3M
Popoff Valves
List Price QUOTE
 Circle Seal Aluminum Relief Valve 500 Series
D520A-4M
Popoff Valves
List Price QUOTE
 Circle Seal Aluminum Relief Valve 500 Series
D520A-6M
Popoff Valves
List Price QUOTE
 Circle Seal Aluminum Relief Valve 500 Series
D520A-8M
Popoff Valves
List Price QUOTE
Series N/A 500
Type N/A Relief Valve
Variation N/A Popoff with deflector cap
Body Material N/A Aluminum
Seal Material1 N/A Teflon®
Valve Size N/A 1/4 in N/A 3/8 in N/A 1/2 in N/A 3/4 in N/A 1 in
End Connection N/A Pipe Thread Male
Operating Pressure N/A 0.5 to 150 psig0 to 10 bar
Cracking Pressure N/A 0.5 to 150 psig
Cracking Pressure Tolerance N/A ±5%
Operating Temperature N/A -100 to 400 ºF
Spring Material N/A
Dim. L N/A 1.38 in N/A 1.43 in N/A 1.98 in N/A 2.31 in N/A 3.16 in
Dim. L1 N/A 1.20 in N/A 1.25 in N/A 1.74 in N/A 2.07 in N/A 2.86 in
Hex N/A 5/8 in N/A 3/4 in N/A 1 in N/A 1.125 in N/A 1 1/2 in
Dia. D (max.) N/A 0.90 in N/A 1.21 in N/A 1.45 in N/A 1.45 in N/A 1.89 in
Weight N/A .03 lbs N/A .04 lbs N/A .08 lbs N/A .13 lbs N/A
Optional End Connections N/A M - Male NPT S - British Taper Pipe (Male) X - British Taper Pipe (Female)
  • 1 520 Series: -100° F to +400° F (-73°C to +204°C) Teflon® o-ring
    K520 Series: -320° F to +165° F (-196°C to +74°C) Polished Teflon® o-ring, cryogenic testing and serialization
    580 Series: Polished Teflon® o-ring