Type 310,311

Change Over Valves



Change-over Valves are used when a plant shutdown is impossible or undesirable for process engineering or commercial reasons. With change-over valves, it is possible to switch over between parallel safety valves without interrupting operation, so as, for example, to perform maintenance work. The design of the change-over valves ensures: low pressure losses on discharge flow (3% criterion) adequate open passage in any position during the change-over process stable operation of the downstream safety valves The combination of LESER change-over and safety valves has been comprehensively tested on full flow test labs.

There are two series available:
Type 310:
Cast construction DN 25...50/ NPS 1"...2"
Applications:
Continuously Functioning Plant
Bitumen refineries
Oilfields
Ethylene plants
Application Required by National Standards
TRB 801 Nr. 14 for refrigeration systems
TRB 801 Nr. 26 for technical gases below -10C (14F)
TRB 801 Nr. 27 for liquid gas systems

Type 311:
Welded construction DN 80...400/ NPS 3"...16"
Non-Drainable Systems
Natural gas caverns, large storage facilities
Storage tanks for technical gases (e.g. ehtylene reservoirs)

Type 310:

Cast construction DN 25...50/ NPS 1"...2"

Type 311:

Welded construction DN 80...400/ NPS 3"...16"

Applications:  

Continuously Functioning Plant

Bitumen refineries
Oilfields
Ethylene plant

Non-Drainable Systems

Natural gas caverns, large storage facilities
Storage tanks for technical gases (e.g. ehtylene reservoirs)

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