Pressure relief valves to atmosphere on compressor
BITZER compressors for R744 are equipped with pressure relief valves to the atmosphere on the low and/or on the high pressure side, depending on the compressor series (see table below).
They only protect the compressor against impermissibly high pressures once it is shut off on both sides.
Any modification to the compressor is the responsibility of the customer/contractor.
The pressure relief valves to atmosphere fitted to the compressor do not replace the system pressure relief valves required by EN378!
They only protect the compressor against impermissibly high pressures once it is shut off on both sides.
Any modification to the compressor is the responsibility of the customer/contractor.
Compressor:
- Ensure that these pressure relief valves can vent freely.
- In the case of compressors for subcritical applications (2NSL– 4NSL), the pressure relief valve is mounted on the suction gas shut-off valve. When operating the compressor, open the suction gas shut-off valve completely (pressure relief valve is then inactive).
- Do not connect any pipes to the outlet of the pressure relief valves.
When performing work or measurements on the maintenance connection of the discharge gas shut-off valve:
Pressures of up to 160 bar can occur at the maintenance connection of the discharge gas shut-off valve!
Standard components (e.g. pressure gauge bridges, hoses, etc.) can be damaged or destroyed.
Proceed carefully and only use components suitable for these high pressure levels!
Minimum opening pressure of the pressure relief valves to atmosphere
Compressor | Low pressure | High pressure |
|---|---|---|
2MTE– 6CTE(U) | 90 (*) | 148 |
8FTE– 8CTE | 80 (*) | 140 |
2MME– 6PME | - | - |
2NSL– 4NSL | 30 | - |
(*) The pressure relief valve on the low pressure side is not part of the standard compressor design, but is available as an option.