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)
Air valve type VENTEX - Reinforced version
|
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 air valves are in conformance with EN 1074-4 and have a certificate of sanitary conformity. |
Range
Air Valves Type VENTEX exist in a range stretching from DN50 to 200, for pressure PFA10, PFA16 and PFA25.
Fast choice of Ventex
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 Performance.
Material and coating
Item |
Designation |
Material |
10, 11, 12, 13, 14, 15, 16, 17 |
Body, Bonnet, fixing flanges, Shutter |
FGS 400/15 coated epoxy 300 µ mini |
1-1 |
Operating stem |
Stainless steel X5CrNiCuNb 16-4 type |
1-2 |
Operating nut |
Cu Al 10 Ni3 Fe2 alu-bronze type |
1-3 |
Locked wash |
Polyamide type 6-6 |
2-1 ; 2-2 , 2-3 |
Body-bonnet: bolts and washes |
Stainless steel A4 |
3 |
Body-bonnet gasket |
EPDM Rubber |
4-1 |
Large orifice seat |
NBR rubber encapsulated SG 400/15 ductile iron |
4-2+4-3+4-4 |
Seat : bolts and washes |
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 |
7 |
Shutter gasket |
EPDM Rubber |
8 |
Ring VAN O FRA |
EPDM Rubber G 7005 |
9 |
V Ring |
NBR Rubber |
18, 19 |
Operating system bolts and washes |
Stainless steel A4 |
20 |
Operating square (or hand wheel) |
FGS 400/15 coated polyurethane |
21 |
Baffle |
Stainless Steel Z6 CN 18-8 type |
22 |
Baffle cover |
Steel S235JR type coated Epoxy 300 µ |
Performances
Water flow in case of break main
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 |
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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 |
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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 on tee: central operating system allows, without water cut of sector, the regular maintenance of Ventex in particular change of the floats ball |
| Mounting with reducing flange |
| Mounting with gate valve: only for a repairing without water cut: operating system or shutter gasket insert gate valve |
| 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 |
Gate valve Type Euro 23for PFA10, 16 - Gate valve Type RVOM for PFA25