Air valve type VENTEX SR (without isolating system) - Reinforced
version
The Ventex SR air valves are without shutter gasket.
The air valves protect the main:
The device evacuates great air amounts during the filling of the main:
allows the inlet of great air amounts (in order to avoid a vacuum effect) during the emptying of the main
evacuates small air amounts that are accumulated in the high points of the main during normal working conditions
The Ventex SR air valves are without shutter gasket. They are less bulky and easier to handle. They therefore do not include isolating system.
The air valves are in conformance with EN 1074-4 and have a certificate of sanitary conformity.
Warning: in order to allow the maintenance, the air valves must be installed with a concentric butterfly valve Lug type or an isolating valve Euro 20 type between the network and the air valve.
Range
Air Valves Type VENTEX SR exist in a range stretching from DN50 to 200, for pressure PFA10, PFA16 and PFA25.
,
| DN Air valve | E | F | H | h1 | a | s |
|---|---|---|---|---|---|---|
| mm | mm | mm | mm | mm | mm | mm |
| 50-65 | 390 | 200 | 258 | 165 | 20 | 15.3 |
| 80-100 | 467 | 244 | 300 | 215 | 20 | 15,3 |
| 150 | 656 | 405 | 492 | 285 | 24 | 18,5 |
| 200 | 737 | 448 | 580 | 330 | 29 | 20,7 |
,,
| Working pressure (bar) | 10 | 16 | 25 |
| Diameter (mm) for DN Air valve 65 | 2.2 | 1.7 | 1.4 |
| Diameter (mm) for DN Air valve 80 to 200 | 3 | 2.4 | 1.9 |
,
Connecting flange: 65 type double air valve is fitted with an ISO PN10-16 or ISO PN25 DN60 rotatable flange
Other flanges available:
ISO PN10-16 or ISO PN25 rotatable DN65 flange
DN50 fixed flange.
Technical design
| 50 | 10 | 25 | * |
| 50 | 16 | 25 | 252926 |
| 50 | 25 | 25 | 252931 |
| 60 | 10 | 25 | * |
| 60 | 16 | 25 | * |
| 60 | 25 | 25 | * |
| 65 | 10 | 27 | 252936 |
| 65 | 16 | 27 | 252923 |
| 65 | 25 | 27 | * |
| 80 | 10 | 40 | 252935 |
| 80 | 16 | 40 | 252922 |
| 80 | 25 | 40 | 252930 |
| 100 | 10 | 40 | 252934 |
| 100 | 16 | 40 | 252921 |
| 100 | 25 | 40 | 252929 |
| 150 | 10 | 115 | 252933 |
| 150 | 16 | 115 | 252890 |
| 150 | 25 | 115 | 252928 |
| 200 | 10 | 186 | 252932 |
| 200 | 16 | 186 | 252887 |
| 200 | 25 | 186 | 252927 |
Features
Allows during the emptying of the main with a speed 1m/s
| Main | DN ≤ 250 | DN300-600 | DN700-900 | DN1000-1200 | DN1200-1800 |
|---|---|---|---|---|---|
| Air Valve | DN50, 60, 65 | DN80,100 | DN150 | DN200 | 2 DN200 |
This Ventex choice allows, in case of break main, to limit maximal pressure drop 0,3 Bar for a flow rate with a part full gravity pipeline on a given slope: See paragraph Performances.
Material and coating
| Item | Designation | Material |
|---|---|---|
| 10, 11 | Body, Bonnet | FGS 400/15 ou 500-7 coated epoxy 300 µ mini acc. EN 1563 |
| 2-1, 2-2, 2-3 | Body-bonnet: bolts and washers | Stainless steel A4 |
| 3 | Body-bonnet gasket | EPDM Rubber acc. EN681-1 |
| 4-1 | Large orifice seat | NBR rubber encapsulated SG 400/15 ductile iron acc. EN 1563 |
| 4-2+4-3+4-4 | Seat: bolts and washers | Stainless steel A4 |
| 5 | Nozzle and nozzle control | Cu Al 10 Ni3 Fe2 alu-bronze type |
| 6-1 and 6-2 | Float balls | EPDM rubber encapsulated Core in steel DC03 or DC04 to EN 10130 and DD11 or DD13 to EN 10111 steel type |
Performances
Water flow in case of break
Examples of Use: for a main DN600 laid inclined 4mm/m flow water around 1800 m3/h , flow which will not create a depression higher than 0,3b according to graph air flow large orifice below
Air flow large orifice
Air Flow output by large orifice in m3/h (with the pressure of main: air flow = water flow) - Air Flow input by large orifice in m3/h (with the pressure of main: air flow = water flow)
Nozzle air flow
Constant Flow from 1 bar (10MCE)
| PFA in Bar | 10 | 16 | 25 | |||
|---|---|---|---|---|---|---|
| DN in mm | 50-65 | 80-200 | 50-65 | 80-200 | 50-65 | 80-200 |
| Ø nozzle in mm | 2,2 | 3 | 1,7 | 2,4 | 1,4 | 1,9 |
| Flow in m3/h | 2,7 | 5 | 1,6 | 3,2 | 1,1 | 2 |
Hydraulic
Small and large Float balls: External leakage
No leakage in low pressure from 0,3 bars
Marking
The marking of the valves manufactured by Saint-Gobain refers to the EN 1074-2 and EN 19 international standards.
Markings are either integral markings, cast in the body, or markings made on plates, securely fixed to the body, in accordance with the EN 19 standard specifications.
| EN 19 Specifications | Saint-Gobain valves process | ||
|---|---|---|---|
| Table 1 – Valve markings | Requirements | ||
| 1 | DN |
EN 19 § 4.2.1 Mandatory markings Shall be integral markings or on a marking plate |
Integral |
| 2 | PN | Integral | |
| 3 | Material | Integral | |
| 4 | Manufacturer's name or trademark | Plate | |
| 11 | Reference to Standard |
EN 19 § 4.3 Supplementary markings Items 7 to 21 in Table 1 are optional |
Plate |
| 12 | Melt identification | Integral | |
| 16 | Quality test | Printed on body | |
| 18 | Manufacturing date | Plate | |
| 21 | Closing direction | Plate + sticker on body | |
Installation
Mounting with gate valve (Concentric LUG Butterfly valve or Euro 20 NG type 23 with or without reducing flange): only for a repairing without water cut: operating system or shutter gasket insert gate valve
- Standard Mounting with Concentric LUG Butterfly Valve
- Mounting with EURO 20 NG type 23
- Mounting with two air valves DN200: for pipes DN1400 up to DN1800: to realize according to sketch on a tee 3 equal socket and a special Blank flange
Related products :
- Concentric LUG butterfly valve
- Gate valve Type Euro 23 for PFA10, 16 - Gate valve Type RVOM for PFA25
