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  1. Hydraulics - Pneumatics
  2. Pipe, Tube and Fitting
  3. Vacuum sight glass
  4. ACI Industriearmaturen GmbH
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Vacuum sight glass Type 390V
stainless steelborosilicate glassweld-on

Vacuum sight glass - Type 390V - ACI Industriearmaturen GmbH - stainless steel / borosilicate glass / weld-on
Vacuum sight glass - Type 390V - ACI Industriearmaturen GmbH - stainless steel / borosilicate glass / weld-on
Vacuum sight glass - Type 390V - ACI Industriearmaturen GmbH - stainless steel / borosilicate glass / weld-on - image - 2
Vacuum sight glass - Type 390V - ACI Industriearmaturen GmbH - stainless steel / borosilicate glass / weld-on - image - 3
Vacuum sight glass - Type 390V - ACI Industriearmaturen GmbH - stainless steel / borosilicate glass / weld-on - image - 4
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Characteristics

Specifications
for vacuum, stainless steel, borosilicate glass, weld-on
DN

Min.: 15 mm
(0.6 in)

Max.: 350 mm
(13.8 in)

Temperature

Min.: 80 °C
(176 °F)

Max.: 200 °C
(392 °F)

Operating pressure

Min.: 0 bar
(0 psi)

Max.: 16 bar
(232 psi)

Description

Overview
  • Type 390V circular sight glass fitting designed for observation and optional illumination of the interior of containers and pipelines in vacuum applications up to positive pressure.
  • Welded to a pipe socket or container wall; borosilicate sight glass (DIN 7080) clamped between two stainless steel flanges with selected gaskets.


Main features
  • Application range: vacuum to positive pressure (typical range −0.9 barg to max. 16 barg).
  • Material: stainless steel 1.4571 (316Ti) for flanges and housing.
  • Standard glass: borosilicate glass according to DIN 7080 (or customer specification).
  • End connection: welding ends according to DIN EN 1092-1 type 11.
  • Sealing: D‑ring or O‑ring gaskets; gasket materials include PTFE (Teflon®), NBR, silicone, EPDM, FKM.
  • Temperature resistance: up to 200 °C (various temperature ratings available).


Options
  • LED illumination (available for Ex and Non-Ex areas).
  • FEP or Halar® coating to protect the borosilicate glass against aggressive chemicals or alkalis.
  • Custom designs and special materials on request.


Accessories (examples)
  • FEP protective screen / coating for additional chemical protection of the sight glass plate.
  • LED lights in different designs for interior illumination.


Construction / components (exploded view)
  • Screws
  • Cover flange
  • Glass cushion
  • Sight glass
  • D‑ or O‑ring
  • Base flange
  • Nuts


Dimensions (PN 16 and related PS rows) — table rows
  • PN 16 — DN 15: Da 95 mm; Di 17 mm; A 21,3 mm; s 2 mm; Seal design: D‑ring DIN 11851; Weight: 1,6 kg
  • PN 16 — DN 20: Da 105 mm; Di 22 mm; A 26,9 mm; s 2,3 mm; Seal design: D‑ring DIN 11851; Weight: 2,3 kg
  • PN 16 — DN 25: Da 115 mm; Di 28 mm; A 33,7 mm; s 2,6 mm; Seal design: D‑ring DIN 11851; Weight: 2,7 kg
  • PN 16 — DN 32: Da 140 mm; Di 37 mm; A 42,4 mm; s 2,6 mm; Seal design: D‑ring DIN 11851; Weight: 4,0 kg
  • PN 16 — DN 40: Da 150 mm; Di 43 mm; A 48,3 mm; s 2,6 mm; Seal design: O‑ring; Weight: 4,4 kg
  • PN 16 — DN 50: Da 165 mm; Di 54 mm; A 60,3 mm; s 2,9 mm; Seal design: O‑ring; Weight: 5,3 kg
  • PN 16 — DN 65: Da 185 mm; Di 70 mm; A 76,1 mm; s 2,9 mm; Seal design: D‑ring DIN 11851; Weight: 6,5 kg
  • PN 16 — DN 80: Da 200 mm; Di 83 mm; A 88,9 mm; s 3,2 mm; Seal design: D‑ring DIN 11851; Weight: 8,4 kg
  • PN 16 — DN 100: Da 220 mm; Di 107 mm; A 114,3 mm; s 3,6 mm; Seal design: D‑ring DIN 11851; Weight: 9,8 kg
  • PN 16 — DN 125: Da 250 mm; Di 132 mm; A 139,7 mm; s 4 mm; Seal design: D‑ring DIN 11851; Weight: 13,3 kg
  • PN 16 — DN 150: Da 285 mm; Di 160 mm; A 168,3 mm; s 4,5 mm; Seal design: O‑ring; Weight: 17,1 kg
  • PS 10¹ — DN 200: Da 340 mm; Di 207 mm; A 219,1 mm; s 6,3 mm; Seal design: O‑ring; Weight: 25,1 kg
  • PS 6¹ — DN 250: Da 405 mm; Di 260 mm; A 273 mm; s 6,3 mm; Seal design: O‑ring; Weight: 37,4 kg
  • PS 6¹ — DN 300: Da 460 mm; Di 310 mm; A 323,9 mm; s 7,1 mm; Seal design: O‑ring; Weight: 49,3 kg
  • PS 6¹ — DN 350: Da 520 mm; Di 340 mm; A 355,6 mm; s 8 mm; Seal design: O‑ring; Weight: 70 kg


Characteristics / specifications
  • Model: Type 390V
  • Application: vacuum to max. 16 barg (typical range −0.9 barg to 16 barg)
  • Nominal pressure (standard): PN 16 (additional PS rows available as per table)
  • Nominal sizes: DN 15 – DN 350
  • Face-to-face / connection: welding ends (DIN EN 1092-1 type 11)
  • Body material: stainless steel 1.4571 (316Ti)
  • Glass material: borosilicate glass (DIN 7080) or per customer specification
  • Seal types: D‑ring (DIN 11851) or O‑ring; gasket materials: PTFE (Teflon®), NBR, silicone, EPDM, FKM
  • Optional coatings: FEP or Halar®
  • Optional illumination: LED lights (Ex and Non-Ex variants)
  • Temperature rating: up to 200 °C (various temperature options listed)
  • Suitable media: liquid and gaseous media
  • Custom designs and accessories available on request

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.