In-Line Seals

Description

Application
In-line seals models RDM 7690 bis 7695.1, flange type and cellular
type (“pancake”) are to be integrated directly into the process pipe. This offers the very best prerequisite for perfect production proces-
ses. In-line seals are especially suitable also for circulating, highly viscous media and such that are inclined to swirl, and for often
changing media, since in-line seals are very well cleanable.
Further more, the thermal behaviour of in-line seals is of remarkable
advantage in comparison to diaphragm seals.
Pressure gauges, pressure switches, pressure transmitters and
pressure transducers can be mounted.

In-line seals for food industry, biotechnis and pharmacy are to find
in data sheet 7630.

Important information about advantages, applications, and features
can be found in our model overview 7000 where you will also find
an overview of our other chemical seal series.
Please note especially the explanations about the influences of
temperature and other special operating conditions, and the
requirement of detailed ordering information resp. inquiries.
Please use our check list for pressure measuring instruments with
chemical seal to ensure the completeness of all required ordering
information (for download to find at our website, PDF-Download).
You can receive the check list in printed version with mail upon
request.

Construction
The diaphragm tube is flush welded to the cylindrical body.
The complete measuring system is evacuated, completely filled with
a suitable filling liquid and hermetically sealed.

Standard Configurations
Process Connections
Norm Sealing Face Nom. Size Model

Cellular type: DIN EN PN 16-100:

DIN EN 1092-1

PN 160-400:
DIN 2526 Form E DN 20…100 RDM 7690

ASME ASME B 16.5 RF 1″…4″ RDM 7695

Flange type: DIN EN DIN EN 1092-1

Form B1 DN 20…100 RDM 7690.1

ASME ASME B 16.5 RF DN 1″…4″ RDM 7695.1

Body
Stainless steel 316 L (1.4435)

Diaphragm
Diaphragm tube 316 L (1.4435) welded to the cylindrical body

Nominal Pressure
PN 16 to 400 bar and 150 to 2500 lb/sq.in., dependent on model and
size, see page 2

Instrument Connection1)
G 1⁄2 female (1⁄2″ BSP-F), stainless steel 316 L (1.4435)

Filling Liquid
Silicone oil (FA1)

1)Separately delivered standard RDM (not mounted to a measuring instrument)
are provided with a filling port at the instrument connection piece.

Pressure Ranges Measuring Instrument
Pressure gauge: 0-1 bar resp. 0-2.5 bar up to PN, dependent on
model and size, compare table page 2
(also corresponding pressure/vacuum compound ranges)
Minimum pressure ranges for other measuring instruments upon request

Reference Temperature
+20 °C ( +68 °F), dial inscription for pressure gauges: tA 20 °C

Sealings
Not part of our standard supply

Special Options
• Female instrument connection G 1⁄4 (1⁄4″ BSP-F), 1⁄2″NPT, 1⁄4″NPT,
others upon request
• Other materials diaphragm tube and/or body upon request
• Working temperature differing from +20 °C (+68 °F)
• Other filling liquid, e. g. high temperature oil (FA3)
• Tongue or groove DIN EN 1092-1 / DIN 2512, ring groove ASME
B 16.5 form RJF
• Other nominal sizes ( compare page 2) upon request
• Special fitting length
• Capillary line between diaphragm seal and instrument (length
limit upon request), or cooling element, see data sheet 7002,
strongly recommended for medium temperatures >+100 °C (>+212 °F)