# Diaphragm seal with threaded connection — 990.31

> Diaphragm seal with threaded connection, plastic version for aggressive, corrosive or environmentally hazardous media.

- Catalog code: 990_31
- Model: 990.31
- Category: Pressure measurement › Diaphragm seals
- Product page: https://avigan.com.ua/wika/en/products/990_31
- Price: on request
- Supplier: AVIGAN (TOV VIKA Prylad), official WIKA partner in Ukraine

## Overview

For aggressive media in completely plastic design: 990.31 diaphragm seals with threaded connection for plant construction, electroplating, wastewater ...

## Applications

- For aggressive, corrosive or environmentally hazardous media
- Plant construction for chemical products
- Electroplating
- Wastewater treatment

## Special features

- All-plastic version

## Specifications

| Parameter | Value |
|---|---|
| model | 990.31 |
| product family | 990 |
| short description | Diaphragm seal with threaded connection, plastic version for aggressive, corrosive or environmentally hazardous media. |
| subcategory | Diaphragm seal |
| certifications | EAC; CRN; MTSCHS |
| ambient temp | 10 … 40 °C |
| languages in datasheet | en |
| pressure ranges | 0 … 2.5 bar; 0 … 10 bar; 0 … 36 psi; 0 … 145 psi |
| process connections | G ¼ female; ¼ NPT female; G ½ female; ½ NPT female; G½ female; ½NPT female; G1/4; G1/2; 1/4NPT; 1/2NPT |
| case material | PP (polypropylene), glass-fibre reinforced, blue RAL 5022; PP(polypropylene), glass-fibre reinforced, blue RAL 5022; PP(polypropylene), grey RAL 7032; PVDF(polyvinylidene fluoride), opaque,yellowish-white |
| wetted parts material | PVC-U (polyvinyl chloride without plasticiser), grey RAL 7011; PP (polypropylene), grey RAL 7032; PVDF (polyvinylidene fluoride), opaque, yellowish-white; PVDF (polyvinylidene fluoride); PVC-U(polyvinyl chloride without plasticiser), grey RAL 7011; EPDM, media side with PTFE foil |
| sealing material | EPDM, media side with PTFE foil; EPDM |
| process temp | -40 … 140 °C |

## Datasheet tables

| Model 990.31 | Standard | Option |
|---|---|---|
| Pressure range | 0 ... 2,5 bar to 0 ... 10 bar [0 ... 36 psi to 0 ... 145 psi] |  |
| Operating pressure and process temperature | See pressure-temperature diagrams from page 4 |  |
| Origin of wetted parts | EU | - |
| Connection to the measuring instrument | ■ G¼female ■ G½female | ■ ¼NPTfemale ■ ½NPTfemale |
| Process connection | ■ G ¼ female ■ G½female | ■ ¼ NPT female ■ ½NPTfemale |
| Type of mounting | Direct mounting | Capillary |
| 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 outer Ø20 ... 80 mm, steel (see data sheet AC 09.07) |

| G | DN 1) | d |
|---|---|---|
| G ¼ | 20 [0.787] | 25 [0.984] |
| G½ | 25 [0.984] | 32 [1.260] |
| ¼ NPT | 20 [0.787] | 25 [0.984] |
| ½NPT | 25 [0.984] | 32 [1.260] |

| 1 | 2 | 3 |
|---|---|---|
| Upper body of diaphragm seal | Wetted parts |  |
|  | Lower body of diaphragm seal | Diaphragm with sealing |
| PP (polypropylene), glass-fibre reinforced, blue RAL 5022 | PVC-U (polyvinyl chloride without plasticiser), grey RAL 7011 PP (polypropylene), grey RAL 7032 PVDF (polyvinylidene fluoride), | EPDM, media side with PTFE foil |

| 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 |

| 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 |

## Documents

- [ds_ds9902_en_co_16a4f3](https://avigan.com.ua/wika/docs/wika/ds_ds9902_en_co.pdf) — PDF, 554 KB, en
- [ds_in0006_en_co_af8b01](https://avigan.com.ua/wika/docs/wika/ds_in0006_en_co.pdf) — PDF, 1239 KB, en