Spring-loaded relief valves should be viewed as supplements and not substitutes for a safety rupture disc. The rupture disc is the primary means for protection of the operator and the vessel in case of accidental over-pressure. Spring-loaded relief valves can be added to a reactor or vessel to:
- Relieve pressures near the maximum operating pressure.
- Reseal once excess pressure has been relieved.
- Protect low pressure components at pressures below available rupture disc ranges.
The relief valves listed below can be installed on any Parr vessel. These relief valves are constructed of stainless steel and have FKM O-rings. Other valve and O-ring materials are available on special order. Relief valves with CE Certification are also available.
| Pressure Relief Valves for Low Pressures | ||||
| Part No. | Preset psi | Adjustable psi | Bar | Discharge Connection |
| A140VB2PA | 100 | 50-150 | 3.45-10.3 | 1/4″ NPT (M) |
| A140VB2P1 | 150 | 50-150 | 3.45-10.3 | 1/4″ NPT (M) |
| A140VB2P2 | 145 | 50-150 | 3.45-10.3 | 1/4″ NPT (M) |
| A140VB2PB | 200 | 150-350 | 10.3-24.1 | 1/4″ NPT (M) |
| A140VB2PC | 600 | 350-600 | 24.1-41.4 | 1/4″ NPT (M) |
| A140VB2PD | 300 | 150-350 | 10.3-24.1 | 1/4″ NPT (M) |
| Pressure Relief Valves for High Pressures | |||
| Part No. | Relief Pressure Range, psi |
Bar | Discharge Connection |
| A175VB | 750-1500 | 52-103 | 1/4″ NPT (F) |
| A175VB2 | 1500-2250 | 103-155 | 1/4″ NPT (F) |
| A175VB3 | 2250-3000 | 155-207 | 1/4″ NPT (F) |
| A175VB4 | 3000-4000 | 207-276 | 1/4″ NPT (F) |
| A175VB5 | 4000-5000 | 276-345 | 1/4″ NPT (F) |
| A175VB7 | 350-750 | 24-52 | 1/4″ NPT (F) |
| A175VB7CH (Hast C) | 350-750 | 24-52 | 1/4″ NPT (F) |
| A175VB8 | 50-350 | 3.4-24.1 | 1/4″ NPT (F) |
| A175VB8CH (Hast C) | 50-350 | 3.4-24.1 | 1/4″ NPT (F) |
*Note: When ordering any of the above relief valves, the user may specify a desired set pressure.
Accessories
4878 Automated Liquid Sampler
Catalyst Addition Devices
Catalyst Baskets
Catalyst Loading Toolkit
Catalyst Testing System
Condensers
Coned Pressure Fittings
Continuous Bulk-Solids Feeder
Controllers
Cooling Coils
Equipment for Use in Potentially Ignitable Atmospheres
External Valves and Fittings
Gas Measurement Systems
--Intermediate Supply Tanks
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--High Pressure Gas Burettes
Heaters
Insulated Electrical Glands
Liners
Liquids Charging Systems
--Liquid Metering Pumps
--Liquid Charging Pipettes
Magnetic Drives
Motors and Drives
Pressure Gages
Pressure Hose
Safety Rupture Discs
Sample Collection Vessel
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Spare Parts Kits
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