Safety flow sight glass type 585 with double glazing

Safety sight glass with double glazing

The ACI flow sight glass Type 585 with double glazing has the same seal in force shunt as our Type 580 but is fitted with two glass panes per viewport.

The viewing panels made of borosilicate glass according to DIN 7080 are sealed with corrugated ring gaskets encased with PTFE in accordance with DIN 28121. The holder is screwed so that the metal parts touch all around the glass fitting and ensure the best possible protection of the glass panel. In addition, the glass fittings have O-ring seals to prevent a leak in the case of glass breakage. Type 585 thereby significantly increases operational safety, as even if the inner glass panel fails, no process medium can leak from the fitting.

In case the seal’s relatively low maximum operating temperature of up to 200°C is not sufficient for your usage, it is possible for our Type 585 sight glass to use graphite compound seals instead of the standard corrugated ring gasket, so that the maximum temperature range of the glass panel of 280°C can be fully exploited. For an additional extended temperature range, we also offer sight glass panels made of quartz or sapphire glass, so that type 585 can meet any challenge.

The casing material can be selected from our comprehensive range of steel and stainless steel alloys with pressure equipment approval, according to your requirements. Apart from standard alloys such as P265GH or 1.4571, we can also supply special materials such as Hastelloy or other nickel-based alloys that meet the highest standards.

Type 585 sight glass fittings with safety double glazing are built up and sized so that the permissible operating pressure can be withstood fully by each of the individual viewing panels alone. Pressure sealing is therefore also ensured if one of the two viewing panels should fail. Between the base and intermediate flange, an O-ring or a flat seal seals towards the atmosphere in case the inner glass panel should fail. It is therefore a true safety model.

Contact our competent sales team to find the perfect solution for you!

Technical data


Body made of P235GH, P265GH, 1.4404 or 1.4571

Glass plates of borosilicate glass DIN7080 or soda lime glass DIN8902, quartz glass, METAGLAS

PTFE enveloped corrugated ring system + O-rings according to customer requirements


straight flow sight glasses with security double glazing

Nominal size:

DN50 - 200

Nominal pressure:

PN16 / 25


max. 200°C


Optional versions are possible.

Request an offer
+49 (0) 2461 91634 00
Offer request Offer
Data sheet download Data sheet
Productvideo Productvideo
Safety flow sight glass type 585