KAESER EPC Series, Service Manual

Page: 65 / 110

10.11 Testing the pressure relief valve
➤ To check the valve activating pressure, it must be removed from the machine by a KAESER
Service Technician and installed in a test rig.
Further information See chapter 2.8 for the activating pressure of the valve.
10.11.1 Pressure relief valves on the cylinder head, collecting pipe and air cooler
To prevent the relief valve from sticking it should be activated at regular intervals or at least once a
year.
The valve opens to protect the machine if the maximum permissible working pressure is ex‐
ceeded.
➤ Never operate the machine without a correctly functioning pressure relief valve.
➤ Do not adjust the pressure relief valve.
Precondition Machine running under LOAD.
Fig. 27 Checking the pressure relief valves on the cylinder head, collecting pipe and air cooler
1
Pressure relief valve
2
Knurled knob
A
Cylinder head relief valve
B
Pressure relief valve in the collecting pipe
C
Air cooler relief valve
WARNING
The pressure relief valve may blow off at any time!
Excessive noise is caused when the pressure relief valve blows off!
There is danger of injury from bursting components and compressed air!
➤ Wear ear and eye protection.
1. Turn the knurled knob on the pressure relief valve anticlockwise until air blows off.
2. Then turn the knurled knob back to its original position.
Pressure relief valve does not blow off?
➤ Have the defective relief valve replaced by KAESER Service.
10.11.2 Air receiver pressure relief valve
To prevent the relief valve from sticking, activate it at regular intervals or at least once a year.
The valve opens to protect the machine if the maximum permissible working pressure is ex‐
ceeded.
➤ Never operate the machine without a correctly functioning pressure relief valve.
➤ Do not adjust the pressure relief valve.
10 Maintenance
10.11 Testing the pressure relief valve
No.: 9_9431_02 E
Service Manual 2-stage piston compressor
EPC
55