handtmann 33501 - 6.3 Operating Characteristics; 6.4 Valve cleaning; CIP

Safety relief valves
33501, 33502, 33503, 33521, 33601, 33602, 33603, 33621
Operation
BA(k)_033501.06_EN
2023-07-27 Albert Handtmann Armaturenfabrik GmbH & Co. KG 17 / 30
6.3 Operating Characteristics
• All the safety relief valves are checked ex works and set to the required pressure.
The setting or the set value is documented in a setting test log.
• The pressure setting occurs at ambient pressure.
• A change of the set pressure is prevented through positive locking inside the upper
valve part. An optional lead sealing provides an additional safety measure on the
outside.
CAUTION
Caution – functional impairment or material damage!
Mechanical manipulations may cause malfunctions.
– Mechanical modifications to the safety relief valves that influence the set
pressure or functionality are impermissible.
– Required modifications should only be carried out by the manufacturer.
Operating pressure:
Working pressure under normal operating conditions
(lower than set pressure)
Set pressure:
Excess pressure at which the safety relief valve starts opening
Response pressure:
Excess pressure at the safety relief valve starts opening during
operation (abnormal operating condition)
Closing pressure:
Pressure at which the safety relief valve is closed again
6.4 Valve cleaning / CIP
Safety relief valves should be cleaned within a defined time period.
• Manual safety relief valves must be disassembled.
The seat area and the seal are cleaned manually.
• Safety relief valves with pneumatic actuator are lifted via compressed air.
The seat area and the seal are cleaned within an automated CIP process.
The safety relief valve should be alternately opened and closed.
CAUTION
Caution – functional impairment or material damage!
Jamming hazard for valve seat/valve disk!
– If the safety relief valve opens upon tank overfilling, especially with viscous,
sugary media, the valve seat must always be cleaned.
Safety valves with pneumatic actuator can be opened for CIP cleaning. For this purpose, a
control air pressure of 5-7 bar are required independent of the set pressure.
Pneumatic connection G 1/8“ with plug connection for compressed air hose Ø 6/4 mm