Item # 524A-8M, Popoff Valves On Circle Valve Technologies Inc.

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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 | Leakage | Applications | Safety

Specifications

Series	N/A 500
Variation	N/A Popoff
Body Material	N/A Aluminum
Seal Material¹	N/A Silicone
Valve Size	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 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 3.16 in
Dim. L1	N/A 2.86 in
Hex	N/A 1 1/2 in
Dia. D (max.)	N/A 1.89 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