990.26

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WIKA · Pressure measurement · Family 990

Diaphragm seal with flange connection

Name: Diaphragm seal with flange connection
Brand: WIKA

Diaphragm seal with flange connection, model 990.26, with internal diaphragm for aggressive, viscous, crystallising or hot media in process industry.

Range

0.4…400 mbar

EACCRNMTSCHS

Price

On request

Depends on configuration

Request a quote

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Description

Diaphragm seals are used for the protection of pressure measuring instruments in applications with difficult media. In diaphragm seal systems, the diaphragm of the diaphragm seal effects the separation of the instrument and the medium. The pressure is transmitted to the measuring instrument via the system fill fluid which is inside the diaphragm seal system.

For the implementation of demanding customer applications, there is a wide variety of designs, materials and system fill fluids available.

For further technical information on diaphragm seals and diaphragm seal systems, see IN 00.06 'Application, operating principle, designs'.

Diaphragm seal with flange connection, model 990.26

The model 990.26 diaphragm seal is particularly well suited for use with small process connections. Due to the internal diaphragm low measuring ranges can be realised. The large diameter of the diaphragm effects a lower deviation at the measuring instrument when the temperature changes.

Mounting of the diaphragm seal to the measuring instruments may be made via direct mounting, for high temperatures via a cooling element or via a flexible capillary.

For the material selection, WIKA offers a variety of solutions, in which the upper body of the diaphragm seal and the wetted parts can be made of identical or different materials. The wetted parts can, as an alternative, be coated.

Special features

Flange with internal, all welded diaphragm
Compact design

Identification

Model	990.26
Product family	990
Subcategory	Diaphragm seal with flange connection

Measuring range

Pressure ranges

400…400 mbar · 6…6 bar · 0.4…400 mbar

Process conditions

Process connection	DN 15DN 20DN 251"DN 15ADN 20ADN 25A½"¾"1/2"3/4"
Process temperature	≤ +400 °C

Materials

Case material	Stainless steel 1.4404 (316L), Stainless steel 1.4539 (904L), Stainless steel 1.4541 (321), Stainless steel 1.4571 (316Ti), Stainless steel 1.4435 (316L), Duplex 2205 (1.4462), Superduplex (1.4410), Hastelloy C22 (2.4602), Hastelloy C276 (2.4819), Inconel 600 (2.4816), Inconel 625 (2.4856), Incoloy 825 (2.4858), Monel 400 (2.4360), Nickel 201 (2.4068), Nickel 200 (2.4060, 2.4066), Titanium grade 2 (3.7035), Titanium grade 7 (3.7235), Titanium grade 11 (3.7225)
Wetted parts material	Stainless steel 1.4404 (316L), Stainless steel 1.4539 (904L), Stainless steel 1.4541 (321), Stainless steel 1.4571 (316Ti), Tantalum, Hastelloy C22 (2.4602), Hastelloy C276 (2.4819), Inconel 600 (2.4816), Inconel 625 (2.4856), Incoloy 825 (2.4858), Monel 400 (2.4360), Nickel 201 (2.4068), Nickel 200 (2.4060, 2.4066), Titanium grade 2 (3.7035), Titanium grade 7 (3.7235), Titanium grade 11 (3.7225), Stainless steel 1.4435 (316L), PTFE lining, PFA coating, Duplex 2205 (1.4462), Superduplex (1.4410), PFA (perfluoroalkoxy), PFA(perfluoroalkoxy) coating, FDA, PFA(perfluoroalkoxy) coating, antistatic
Sealing material	PTFE, PFA

Operating environment

Weight

1 kg

Certifications and approvals

Certifications

EACCRNMTSCHS

Additional details

Datasheet languages

Tables from datasheet

Model 990.26	Standard	Option
Pressure range	From 400 mbar [5.8 psi] depending on diaphragm diameter For diaphragm seal systems with pressure gauges from 6 bar [87 psi]
Level of cleanliness of wetted parts	Oil- and grease-free per ASTM G93-03 level FWIKA standard (< 1,000 mg/m 2 )	Oil- and grease-free per ASTM G93-03 level D and ISO 15001 (< 220 mg/m 2 )
Origin of wetted parts	International	EU, CH, USA
Connection to the measuring instrument	Axial connection adapter	Axial connection adapter with female thread G½, G¼, ½NPTor¼NPT
Mounting type	Direct mounting	■ Capillary ■ Cooling element
Version per NACE	-	■ MR0175 ■ MR0103
Vacuum service (see IN 00.25)	Basic service	■ Premium service ■ Advanced service
Instrument mounting bracket (only for capillary option)	-	■ Form H per DIN 16281, 100 mm, aluminium, black ■ Form H per DIN 16281, 100 mm, stainless steel ■ Bracket for pipe mounting, for pipe Ø20 ... 80 mm, steel (see data sheet AC 09.07)

Standard	Flange size	Sealing face
		Standard	Option
In line with DIN EN 1092-1	DN 15	Form B1	Form B2
DN 20
DN 25
In line with ASME B16.5	½"	RF 125 ... 250 AA	RFSF
¾"
1"
In line with GOST 33259	DN 15	Type B	-
DN 20
DN 25
In line with JIS B 2220	DN 15A	RF	-
DN 20A
DN 25A

Upper body of diaphragm seal	Wetted parts	Maximum permissible process temperature 1)
Raised face insert	Diaphragm	in °C [°F]
Stainless steel 1.4404 (316L)	Stainless steel 1.4404 (316L)	Stainless steel 1.4435 (316L)	400 [752]
Stainless steel 1.4404 (316L)	Stainless steel 1.4404 (316L)
Stainless steel 1.4539 (904L)	Stainless steel 1.4539 (904L)
Stainless steel 1.4541 (321)	Stainless steel 1.4541 (321)
Stainless steel 1.4571 (316Ti)	Stainless steel 1.4571 (316Ti)
Stainless steel 1.4404 (316L) with PTFE lining	PFA (perfluoroalkoxy) coating, FDA	260 [500]
Stainless steel 1.4404 (316L) with PTFE lining	PFA (perfluoroalkoxy) coating, antistatic
Hastelloy C22 (2.4602)	Hastelloy C22 (2.4602)	260 [500]
Hastelloy C276 (2.4819)	Hastelloy C276 (2.4819)	400 [752]
Inconel 600 (2.4816)	Inconel 600 (2.4816)
Inconel 625 (2.4856)	Inconel 625 (2.4856)
Incoloy 825 (2.4858)	Incoloy 825 (2.4858)
Monel 400 (2.4360)	Monel 400 (2.4360)
Tantalum	Tantalum	300 [572]
Stainless steel 1.4435 (316L)	Stainless steel 1.4435 (316L)	Stainless steel 1.4435 (316L)	400 [752]
Stainless steel 1.4539 (904L)	Stainless steel 1.4539 (904L)	Stainless steel 1.4539 (904L)
Stainless steel 1.4541 (321)	Stainless steel 1.4541 (321)	Stainless steel 1.4541 (321)
Stainless steel 1.4571 (316Ti)	Stainless steel 1.4571 (316Ti)	Stainless steel 1.4571 (316Ti)
Duplex 2205 (1.4462)	Duplex 2205 (1.4462)	Duplex 2205 (1.4462)	300 [572]
Superduplex (1.4410)	Superduplex (1.4410)	Superduplex (1.4410)
Hastelloy C22 (2.4602)	Hastelloy C22 (2.4602)	Hastelloy C22 (2.4602)	400 [752]
Hastelloy C276 (2.4819)	Hastelloy C276 (2.4819)	Hastelloy C276 (2.4819)
Inconel 600 (2.4816)	Inconel 600 (2.4816)	Inconel 600 (2.4816)
Inconel 625 (2.4856)	Inconel 625 (2.4856)	Inconel 625 (2.4856)
Incoloy 825 (2.4558)	Incoloy 825 (2.4858)	Incoloy 825 (2.4858)
Monel 400 (2.4360)	Monel 400 (2.4360)	Monel 400 (2.4360)
Nickel 201 (2.4068)	Nickel 201 (2.4068)	Nickel 201 (2.4068)
Nickel 200 (2.4060, 2.4066)	Nickel 200 (2.4060, 2.4066)	Nickel 200 (2.4060, 2.4066)
Titanium grade 2 (3.7035)	Titanium grade 2 (3.7035)	Titanium grade 2 (3.7035)
Titanium grade 7 (3.7235)	Titanium grade 7 (3.7235)	Titanium grade 11 (3.7225)
Titanium grade 11 (3.7225)	Titanium grade 11 (3.7225)	Titanium grade 11 (3.7225)

Logo	Description	Country
	EAC (option) Pressure Equipment Directive	Eurasian Economic Community
-	CRN Safety (e.g. electr. safety, overpressure, ...)	Canada
-	MTSCHS (option) Permission for commissioning	Kazakhstan

View all (13)

DN	PN	Dimensions in mm[in]	x	Weight in kg [lbs]
Mb	D	b	d 2	f	k	d₄
15	10-40	40 [1.575]	95 [3.74]	22 [0.866]	14 [0.551]	2 [0.079]	65 [2.559]	45 [1.772]	4	1 [2.2]
20	10-40	40 [1.575]	105 [4.134]	22 [0.866]	14 [0.551]	2 [0.079]	75 [2.953]	58 [2.283]	4	1.3 [2.9]
25	10-40	52 [2.047]	115 [4.528]	22 [0.866]	14 [0.551]	2 [0.079]	85 [3.346]	68 [2.677]	4	1.5 [3.3]

Flange material	DN	PN	Maximum allowable pressure in bar [psi] at ambient temperature 21 °C [60.8 °F]
Nickel 200 (2.4066)	15, 20, 25	10	7.4 [107]
	16	11.9 [172]
	25	18.6 [269]
	40	29.7 [430]
Nickel 201 (2.4068)	15, 20, 25	10	6.2 [89]
	16	10 [145]
	25	15.6 [226]
	40	25 [362]

DN	Class	Dimensions in mm[in]	x	Weight in
		Mb	D	b	d 2	f	k	d₄		kg [lbs]
½"	150	32 [1.26]	90 [3.543]	22 [0.866]	16 [0.63]	2 [0.079]	60.3 [2.374]	34.9 [1.374]	4	1 [2.2]
	300	40 [1.575]	95 [3.740]	22 [0.866]	16 [0.63]	2 [0.079]	66.7 [2.626]	34.9 [1.374]	4	1 [2.2]
¾"	150	40 [1.575]	100 [3.937]	22 [0.866]	16 [0.63]	2 [0.079]	69.9 [2.752]	42.9 [1.689]	4	1.1 [2.4]
	300	40 [1.575]	115 [4.528]	22 [0.866]	19 [0.748]	2 [0.079]	82.6 [3.252]	42.9 [1.689]	4	1.6 [3.5]
1"	150	52 [2.047]	110 [4.331]	22 [0.866]	16 [0.63]	2 [0.079]	79.4 [3.126]	50.8 [2]	4	1.4 [3]
	300	52 [2.047]	125 [4.921]	22 [0.866]	19 [0.748]	2 [0.079]	88.9 [3.5]	50.8 [2]	4	1.7 [3.7]

DN	PN	Dimensions in mm[in]	x	Weight in kg [lbs]
Mb	D	b	d 2	f	k	d₄
15	10-40	40 [1.575]	95 [3.74]	22 [0.866]	14 [0.551]	2 [0.079]	65 [2.559]	47 [1.85]	4	1 [2.2]
20	10-40	40 [1.575]	105 [4.134]	22 [0.866]	14 [0.551]	2 [0.079]	75 [2.953]	58 [2.283]	4	1.3 [2.9]
25	10-40	52 [2.047]	115 [4.528]	22 [0.866]	14 [0.551]	2 [0.079]	85 [3.346]	68 [2.677]	4	1.5 [3.3]

DN	PN	Dimensions in mm[in]	x	Weight in kg [lbs]
Mb	D	b	d 2	f	k	d₄
15	10K - 20K	40 [1.575]	95 [3.74]	21 [0.827]	15 [0.591]	1 [0.04]	70 [2.756]	51 [2.008]	4	1 [2.2]
20	10K - 20K	40 [1.575]	100 [3.937]	21 [0.827]	15 [0.591]	1 [0.04]	75 [2.953]	56 [2.205]	4	1.3 [2.9]
25	10K - 20K	52 [2.047]	125 [4.921]	21 [0.827]	19 [0.748]	1 [0.04]	90 [3.543]	67 [2.638]	4	1.7 [3.7]

Flange material	DN	PN	Maximum allowable pressure in MPa [psi] at ambient temperature 21 °C [60.8 °F]
Nickel 200 (2.4066)	15, 20, 25	10K	0.7 [101]
16K	1.4 [202]
20K	1.8 [261]
Nickel 201 (2.4068)	15, 20, 25	10K	0.9 [130]
16K	1.7 [246]
20K	2.1 [304]
Monel 400 (2.4360)	15, 20, 25	10K	1 [145]
16K	1.8 [261]
20K	2.3 [333]
Inconel 600 (2.4816)	15, 20, 25	10K	1 [145]
16K	1.9 [275]
20K	2.4 [348]
Incoloy 825 (2.4558)	15, 20, 25	10K	1.2 [174]
16K	2.4 [348]
20K	3 [435]
Titanium grade 2 (3.7035)	15, 20, 25	10K	1.2 [174]
16K	2.3 [333]
20K	2.9 [420]
Titanium grade 7 (3.7235)	15, 20, 25	10K	1.2 [174]
16K	2.3 [333]
20K	2.9 [420]

Material	Unified numbering system (UNS)
Stainless steel 316L (1.4404 or 1.4435)	S31603
Stainless steel 904L (1.4539)	N08904
Stainless steel 321 (1.4541)	S32100
Stainless steel 316Ti (1.4571)	S31635
Stainless steel 1.4466 (urea grade)	S31050
Duplex 2205 (1.4462)	S31803
Superduplex 1.4410	S32750
Tantalum (also lining)	R05200
Hastelloy C276 (2.4819)	N01276
Hastelloy C22 (2.4602)	N06022
Inconel 600 (2.4816)	N06600
Incoloy 825 (2.4858)	N08825
Inconel 625 (2.485)	N06625
Monel 400 (2.4360)	N04400
Nickel 200 (2.4066)	N02200
Nickel 201 (2.4068)	N02201
Titanium 3.7035 (class 2)	R50400
Titanium 3.7235 (class 7)	R52400
Zirconium GR702	R60702

Designation	Identi- fication number	Solidi- fication point	Boiling/ degradation point	Density at 25 °C	Kin.Viscosity at 25 °C	Remark
KN	°C	°C	g/cm³	cSt
Silicone oil	2	-45	+300	0.96	54.5	Universal application
Glycerine	7	-35	+240	1.26	759.6	FDA 21 CFR 182.1320
Silicone oil	17	-90	+200	0.92	4.4	Low temperatures
Halocarbon	21	-60	+175	1.89	10.6	Oxygen 1) and chlorine
Methylcyclopentane	30	-130	+60	0.74	0.7	For very low temperatures
High-temperature silicone oil	32	-25	+400	1.06	47.1	For high temperatures
Neobee® M-20	59	-35	+260	0.92	10.0	FDA 21 CFR 172.856, 21 CFR 174.5
DI water	64	+4	+85	1.00	0.9	For ultrapure media
Silicone oil	68	-75	+250	0.93	10.3
DI water/propanol mixture	75	-30	+60	0.92	3.6	For ultrapure media
Medicinal white mineral oil	92	-15	+260	0.85	45.3	FDA 21 CFR 172.878, 21 CFR 178.3620(a); USP, EP, SP

Maximum temperature	Maximum oxygen pressure
to 60 °C	50 bar
> 60 °C to 100 °C	30 bar
> 100 °C to 175 °C	25 bar