Type 310 311

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"

Type 311

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

Applications
Continuously Functioning Plant
Bitumen refineries
Oilfields
Ethylene plants

Non-Drainable Systems
Natural gas caverns
Large storage facilities
Storage tanks for technical gases (e.g. ehtylene reservoirs)

Application Required by National Standards

TRB 801 Nr. 14 for refrigeration systems
TRB 801 Nr. 26 for technical gases below -10°C (14°F)
TRB 801 Nr. 27 for liquid gas systems