Vacuum Butterfly Valve — Eccentric Disc Type

Quarter-turn isolation valve for transformer oil lines: between tank and conservator, on radiator and cooler circuits, and at filter/drain connections. The eccentric disc seals progressively against the seat, holding vacuum during oil filling and maintenance — so the conservator can be isolated without a full oil drain.

Bore sizes
DN 40 – DN 200 (7 sizes)
Type
Vacuum eccentric (disc) butterfly valve
Function
Oil line isolation, vacuum-holding
Application
Tank–conservator, radiators, coolers
MOQ
Small trial orders accepted
  • DN40
  • DN50
  • DN80
  • DN100
  • DN125
  • DN150
  • DN200

* Flange drilling, body material and seal compound are confirmed per order against factory datasheets — request the dimensional PDF with your inquiry.

Vacuum butterfly valve bodies for power transformer oil lines

Technical Data

Bore sizeTypical use
DN 40 / DN 50Gauge, relay and breather take-off lines
DN 80 / DN 100Radiator and small cooler circuits
DN 125 / DN 150 / DN 200Main tank–conservator oil line, large coolers
Flange pattern / body & seal materials / torque dataTBD* — per factory datasheet, PDF on request

* To be confirmed per order. Tell us the pipe diameter and mating flange standard (e.g. GB, DIN, ANSI) — we match before quoting.

Frequently Asked

Will it match our existing pipe flanges?

Send us the bore size and a photo or drawing of the mating flange — we confirm the drilling pattern and gasket before you order.

Can we mix valve sizes in one shipment?

Yes — mixed sizes are common on transformer projects and ship consolidated with your other accessories (relay, PRV, gauge, breather) in one consignment.

Need DN80 butterfly valves for a retrofit?

Send the bore size and flange standard — priced offer within 24 hours.

Request a Quote