Automatic degassing Air Valve Type 100

Type 100

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Type 110

Type 111

Type 111

Type 112

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Type 113

Automatic degassing Air Valve Type 100

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Main features

DN 40-50-60-65 or 80-100 : flange for multi DN

Material and coating

ItemDesignationMaterialCoatings

1

Body

Ductile iron GS 400-15

Blue Epoxy 250 microns

2

Cover

3

Screw

Stainless steel A2

4

Washer

Stainless steel A2

5

Float

ABS

6

Nozzle

Polyamide

7

Nut

Polyamide

8

Gasket

EPDM

9

O ring

EPDM

10

Gasket

EPDM

11

Adjusting screw

Stainless steel A2

12

Pin

Stainless steel A2

13

Air valve

Brass

Performances

Applicable Standards

Hydraulic test

Every single air valve is subjected to hydraulic test in accordance with the prescription EN 1074:

  • Test of float at minimum declared pressure according to EN 1074-1 standard (0,5 bar).

Product test

  • Control of coatings: test of thickness, holiday test, impact test, MIBK test.

Conformity to the standards

Product:

  • EN 1074-1
  • EN 1074-4

Flanges connection:

  • EN 1092-2
  • ISO 7005-2

Suitability for potable water:

  • D.M. 174 for applicable parts (ex : C.M. 102 du 02/12/78)
  • Conformity with foreign norms: KTW (Germany), WRC (UK), ACS (France)

Marking

On the body:

  • Type of ductile iron
  • Model code
  • Manufacturer's logo
  • Fusion date

On the labels:

  • Nominal diameter in mm (DN)
  • Nominal pressure in mm (PN)
  • Maximum operating pressure (PFA)
  • Production number
  • Manufacturer's logo

Valves selection

The operating pressure value (PFA) is defined depending on the pressure of the pipeline. Moreover this is important to verify that the operating temperature is between 0° C and 40°C.

The maximum flow allowable depends on air valve PFA and is calculated using the formula:

Q = v*A; where “v” is the outlet air speed from a small orifice (measured: 195 m/s) with pressure more than 1,3 bar.

PFA

Orifice Diameter (mm)

Max Flow (m3/h)

25

1,75

1,69

16

2,25

2,79

To evaluate if a single vent is enough, it must be check the air flow which is to be evacuated, which depends on the devices fitted on the pipe (i.e. pump thrust, etc…) and the solubility of air in water (Bunsen coefficient, function of temperature and pressure).

Instructions for use

Storage

The air valve will have to be stored (if possible) in covered places, as possible protected from the sun and from the rain and generally from the atmospheric agents. Moreover it will have to be avoided that the seal of the air valves are in contact with dust or gravel.

Installation

The automatic degassing air valve is installed where the pipe have a slope variation, for eliminating the air balls which can be accumulated in the higher points or moving inside the duct.

Maintenance

In order to grant the possibility of future inspections, it is necessary during the installation to fit a manual sectioning device (i.e. gate valve or butterfly valve) between the pipe flange and the air valve. In this way it will be possible to maintain without interrupting service. It is important to make sure that air valve can be dissembled while the pipe is still in service.

Solutions