Pressure

Diaphragm seal with flange connection

For the pulp and paper industry
Model 990.23
WIKA data sheet DS 99.34

for further approvals

see page 6

Applications

■ Highly viscous, hardening or particle-laden media

■ Pulp manufacture
■ Waste-paper processing

Special features

■ Rotatable retainer flange

■ Versions with 90° pipe elbow and vibration damper

Diaphragm seal with flange connection, model 990.23

Description

Diaphragm seals are used for the protection of pressure The model 990.23 diaphragm seal has been developed
measuring instruments in applications with difficult media. In for use in pulp manufacture or waste-paper processing
diaphragm seal systems, the diaphragm of the diaphragm applications.
seal effects the separation of the instrument and the medium.
The pressure is transmitted to the measuring instrument Mounting of the diaphragm seal to the measuring instrument
via the system fill fluid which is inside the diaphragm seal may be made via a direct connection, for high temperatures
system. via a cooling element or via a flexible capillary. Furthermore,
versions with 90° pipe elbow and vibration damper are
For the implementation of demanding customer applications, available.
there are a wide variety of designs, materials and system fill
fluids available. For the material selection WIKA offers a variety of solutions,
in which the upper body of the diaphragm seal and the
For further technical information on diaphragm seals and wetted parts can be made of identical or different materials.
diaphragm seal systems see IN 00.06 “Application, operating The wetted parts can, as an alternative, be coated.
principle, designs”.

WIKA data sheet DS 99.34 ∙ 02/2021 Page 1 of 6

Data sheets showing similar products:

Diaphragm seal with flange connection; model 990.27; see data sheet DS 99.27
Specifications
Model 990.23 Standard Option
Pressure range 0 ... 0.6 to 0 ... 40 bar (0 ... 8.7 to 0 ... 580 psi)
Level of cleanliness of wetted Oil and grease free per ASTM G93-03 level F ■ Oil and grease free per ASTM G93-03 level D and
parts WIKA standard (< 1,000 mg/m²) ISO 15001 (< 220 mg/m2)
■ Oil and grease free per ASTM G93-03 level C and
ISO 15001 (< 66 mg/m²)

Origin of wetted parts International EU, CH, USA

Extension length 6.5 mm (0.256 in) 17 mm (0.669 in)

Connection to the measuring Axial weld-in connection Axial weld-in connection with G ½, G 1/4, 1/2 NPT or
instrument 1/4 NPT (female)
Type of mounting Direct mounting ■ 90° pipe elbow, rotatable through 180°
■ 90° pipe elbow, fixed
■ 90° pipe elbow and vibration damper, rotatable
through 180°
■ 90° pipe elbow and vibration damper, fixed
■ Capillary
■ Cooling element

Retainer flange Stainless steel -

Accessories - ■ Welding socket for integration into the process

line, see data sheet AC 09.20
■ Perbunan sealing

Material combinations

Upper body of diaphragm Wetted parts Maximum permissible process

seal temperature ¹⁾ in °C (°F)
Stainless steel 1.4404 (316L) Stainless steel 1.4404 / 1.4435 (316L), standard version 400 (752)
Ceramic coating wikaramic®
PFA (perfluoroalkoxy) coating, FDA 260 (500)
PFA (perfluoroalkoxy) coating, antistatic
ECTFE coating 150 (302)
Stainless steel 1.4435 (316L) Stainless steel 1.4435 (316L) 400 (752)
Stainless steel 1.4541 (321) Stainless steel 1.4541 (321)
Stainless steel 1.4571 (316Ti) Stainless steel 1.4571 (316Ti)
Duplex 2205 (1.4462) Duplex 2205 (1.4462) 300 (572)
Monel 400 (2.4360) Monel 400 (2.4360) 400 (752)

1) The maximum permissible process temperature is limited by the joining method and by the system fill fluid.

Further material combinations for special process temperatures on request

WIKA data sheet DS 99.34 ∙ 02/2021 Page 2 of 6

Example: Diaphragm seal model 990.23

Not included Sealing

in delivery Process connection

Pressure gauge

Direct mounting

Diaphragm seal
d4

Raised face k
D

Diaphragm
(welded to diaphragm seal)

Legend:

14261380.01
D Outer diameter of diaphragm seal
d4 Sealing face diameter
k Pitch circle diameter

WIKA data sheet DS 99.34 ∙ 02/2021 Page 3 of 6

Dimensions in mm (in)

Standard version

1036904.03
Version with 90° pipe elbow

1036912.03
NS

Dimensions in mm (in)
NS H
63 (2.48) 120 (4.724)
100 (3.937) 140 (5.512)
160 (6.299) 170 (6.693)

WIKA data sheet DS 99.34 ∙ 02/2021 Page 4 of 6

Version with 90° pipe elbow and vibration damper
(only for filled pressure gauges up to NS 100)

14261220.01
NS

Dimensions in mm (in)
NS H
63 (2.48) 145 (5.709)
100 (3.937) 165 (6.496)
160 (6.299) 195 (7.677)

Version with 90° pipe elbow and vibration damper, rotatable

(only for filled pressure gauges up to NS 100)
1036920.03
NS

Dimensions in mm (in)
NS H
63 (2.48) 142 (5.591)
100 (3.937) 162 (6.378)
160 (6.299) 192 (7.559)

WIKA data sheet DS 99.34 ∙ 02/2021 Page 5 of 6

 Approvals

Logo Description Country

EAC (option) Eurasian Economic Community
Pressure equipment directive
- CRN Canada
Safety (e.g. electr. safety, overpressure, ...)
- MTSCHS (option) Kazakhstan
Permission for commissioning

Certificates (option)
■ 2.2 test report per EN 10204 (e.g. state-of-the-art
manufacturing, material proof, indication accuracy for
diaphragm seal systems)
■ 3.1 inspection certificate per EN 10204 (e.g. material
proof for wetted metallic parts, indication accuracy for
diaphragm seal systems)

Approvals and certificates, see website

Ordering information
Diaphragm seal:
Diaphragm seal model / Process connection (nominal pressure) / Materials (upper body, sealing face, diaphragm, sealing)
/ Level of cleanliness of wetted parts / Origin of wetted parts / Design per NACE / Connection to the measuring instrument /
Certificates / Retainer parts / Accessories

Diaphragm seal system:

Diaphragm seal model / Pressure measuring instrument model (per data sheet) / Mounting (direct mounting, cooling
element, capillary) / Type of mounting (pipe elbow, vibration damper) / Materials (upper body, sealing face, diaphragm) / Min.
and max. process temperature / Min. and max. ambient temperature / System fill fluid / Certificates / Height difference / Level
of cleanliness of wetted parts / Origin of wetted parts / Accessories

© 04/2008 WIKA Alexander Wiegand SE & Co. KG, all rights reserved.
The specifications given in this document represent the state of engineering at the time of publishing.
We reserve the right to make modifications to the specifications and materials.
02/2021 EN

WIKA data sheet DS 99.34 ∙ 02/2021 Page 6 of 6

WIKA Alexander Wiegand SE & Co. KG

Alexander-Wiegand-Straße 30
63911 Klingenberg/Germany
Tel. +49 9372 132-0
Fax +49 9372 132-406
info@wika.de
www.wika.de