Circle Seal L5349B Relief Valve
5300 Series: 400 to 10,500 psig Relief Valves
Features:
- Zero leakage: up to 95 of cracking pressure
- No chatter or squeal: completely balanced; smooth, quiet operation at all flows; no chatter or squeal from pressure changes or surges downstream
- Positive reseal: repeatedly reseals at high percentage of the cracking pressure
- Virtually no pressure rise with increasing flow: design utilizes system back pressure on poppet to increase lift, providing excellent flow characteristics with little or no pressure rise
- Accurate set pressure: valves crack repeatedly at preset pressure with minimal variation; o-ring breakaway friction is overcome before valve opens
- Externally adjustable: external adjustment permits changes in cracking pressure to meet circuit requirements; interchangeable springs permit change of cracking pressure range
- PED certifications and CE marking available for most models: add “PED” prefix to the valve part number if required
Circle Seal L5349B Relief Valve Technical Data:
- Description: Relief Valve, 1/4″ or 1/2″ FNPT connections, constructed in Brass with Buna-N seal, cracking pressures 400 to 10500 psig (depending on size)
- Operating Pressure: 400 to 10,500 psig
- Service Type: Liquid
- Body Material: Brass
- Seal Material: Buna-N
- Poppet Material: CRES 440C
- Seat Material: 17-4PH Stainless Steel
- Spring Material: 17-7PH Stainless Steel
- Backup Rings: PTFE
- Cracking Pressure (REQUIRED SET PRESSURE MUST BE SPECIFIED):
- 1/4″ FNPT Connections: 420 to 10,500 psig
- 1/2″ FNPT Connections: 400 to 10,500 psig
- Temperature Range: -65F to +250F
- Cracking Pressure Tolerance: ±5%
- Flow at Cracking Pressure: 5 cc/min gas
- Reseal Pressure:
- Cracking pressures between 400-599 psi: 80% of cracking pressure
- Cracking pressures between 600-899 psi: 85% of cracking pressure
- Cracking pressures between 900-5999 psi: 90% of cracking pressure
- Cracking pressures above 6000 psi: 95% of cracking pressure
- Leakage at Reseal Pressure:
- Ascending Pressure: 5 cc/min max to 95% of cracking pressure
- Descending Pressure: 15 cc/min max at reseal pressure
Dimensional Information:
Notes:
- Air and Hydraulic flow curves are available in the product catalog.
- In normal service, the only parts which may require replacement are the seals. A repair kit may be ordered by placing a “K/” in front of the complete valve part number (i.e. K/5349B-2PP-3000).
- To specify PED certification, add “PED” prefix to the part number. For PED applications, Brass and 303SS bodies are limited to a max temp of +100F.
- Standard connection type is FNPT; many alternative connection types are available upon special request (contact Sales for assistance).
- Any back pressure above atmosphere reduces the cracking pressure by 0.35 psi for each 1.0 psi of back pressure.
- Cracking pressure on initial crack after standing un-actuated for a prolonged period will be higher than the set pressure.
- Proper filtration is recommended to prevent damage to sealing surfaces.
- 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 these products can cause personal injury or property damage.
Please contact our Sales Department for assistance in selecting the right products for your application.
Product Catalog: Circle Seal 5300-Series Relief Valves
Service Information Sheet: Circle Seal 5300-Series Relief Valves
