Circle Valve Technologies Inc.
307 Derstine Ave, Suite 204
Lansdale, PA 19446

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
  • 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.

‘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.

Not available over 74.9 psi (5 bar)
Unit of Measure

Specifications

Series

 N/A 500

Variation

 N/A Inline

Body Material

 N/A 316 Stainless Steel
Seal Material1 N/A Silicone

Valve Size

 N/A 1 1/4 in

End Connection

 N/A Pipe Thread Male/Female

Operating Pressure

 N/A 0.5 to 150 psig0 to 10 bar

Cracking Pressure

 N/A 0.5 to 74.9 psig

Cracking Pressure Tolerance

 N/A ±5%

Operating Temperature

 N/A -70 to 450 ºF

Proof Pressure

 N/A 400 psig

Rated Burst Pressure

 N/A 500 psig

Dim. L

 N/A 4.67 in

Hex

 N/A 1 7/8 in

Optional Body Material

 N/A 303 stainless steel 316 Stainless Steel Aluminum Brass

Optional End Connections

 N/A M - Male NPT S - British Taper Pipe (Male) X - British Taper Pipe (Female)

Leakage

N/A 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

N/A

  • 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

N/A 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.

  • 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