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]
All Categories > Relief Valves > 500 Series Relief Valves 0.5 to 150 psig > Item # D520A-6M  


Item # D520A-6M, Popoff Valves
List Price QUOTE

Features
  • Popoff or inline valves
  • Adjustable crack pressure
  • Zero leakage
  • Optional factory preset
  • Accurate set pressure
  • Wide range of cracking pressure
  • Tamper-proof adjustment
  • 100% seat leakage tested
  • PED certifications and CE marking available for most models
Note: Proper filtration is recommended to prevent damage to sealing surface.
Repair Kit:

‘D’ Variation: Prefixed part number is supplied with a cap which diverts high pressure blasts from personnel and instruments, and serves as a rain and dust shield.





Specifications  · Leakage  · Applications  · Safety

Specifications

Series
500

Variation
Popoff with deflector cap

Body Material
Aluminum

Seal Material1
Teflon®

Valve Size
3/4 in

End Connection
Pipe Thread Male

Operating Pressure
0.5 to 150 psig
0 to 10 bar

Cracking Pressure
0.5 to 150 psig

Cracking Pressure Tolerance

 View
±5%

Operating Temperature
-100 to 400 ºF

Proof Pressure
400 psig

Rated Burst Pressure
500 psig

Dim. L
2.31 in

Dim. L1
2.07 in

Hex
1.125 in

Dia. D (max.)
1.45 in

Weight
.13 lbs

Optional Body Material
303 stainless steel
316 Stainless Steel
Aluminum
Brass

Optional End Connections
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


Leakage
Leakage, Ascending Pressure
Standard seals: 0 to 95% of cracking pressure
Silicon & EPR: 0 to 80% of cracking pressure
Teflon®:
Cracking pressures up to 2.4 psi: 4cc/min at 0 to 50% of cracking pressure Cracking pressures 2.5 psi and higher: 1cc/min at 0 to reseat pressure, 10cc/min from reseat to 90% of cracking pressures

Leakage at Reseat Pressure
All elastomeric seals: Zero
Teflon®: 1cc/min for cracking pressures 2.5 psi and higher


Applications
  • System overpressure protection
  • Storage tanks
  • Freon® recovery systems
  • Medical equipment
  • Refrigeration & heating equipment
  • Measuring & dispensing pumps
  • Communications equipment
  • Process control instruments
  • R&D pilot plants
  • Vacuum pump safety


Safety
For Your Safety
It is solely the responsibility of the system designer and user to select products suitable for their specific application requirements and to ensure proper installation, operation, and maintenance of these products. Material compatibility, product ratings and application details should be considered in the selection. Improper selection or use of products described herein can cause personal injury or property damage.



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