VALVES



VALVES

Physical Dimensions :  Physical Dimensions of Single Air Valve (Small Orifice S2):

size(mm)

B(Height) Min

CSQ (Width)

Suitable for Main Size

25

202

164

Up to 100

40

237

180

Upto 100

50

287

180

 125 to 200

Double Air Valve :   Physical Dimensions of Double Air Valve :

Valve size(mm)

A (Width) Min

B   (min)

C (Height)(Min)

Suitable for Main Size

40

442

210

371

Up to 100

50

442

210

407

125 to 200

80

504

236

431

225 to 350

100

634

280

501

400 to 500

150

860

430

620

600 to 900

200

988

506

735

1000 to 1200

Dimensions: Body Thickness : 

 Valve size

Single Air Valve

 Double Air Valve  (DS12)

Kinetic Air Valve (DK)

Small Orifice

Large Orifice

 

PN 1.0

PN 1.6

PN 1.0

PN 1.6

PN 1.0

PN 1.6

PN 1.0

PN 1.6

15

6

8

--

--

--

--

--

--

25

6

8

6

8

--

--

--

--

40

8

10

8

10

8

10

8

10

50

--

--

9

10

9

10

9

10

80

--

--

--

--

10

12

10

12

100

--

--

--

--

10

12

10

12

150

--

--

--

--

13

16

13

16

200

--

--

--

--

14.5

18

14.5

18

Kinetic Air Valve  (DK) : Physical Dimensions of Kinetic Air Valve  (DK):

Valve size (mm)

A (Width) Min

B(min)

C (Height) (Min)

Suitable for Main Size

40

260

196

324

Up to 100

50

280

211

352

125 to 200

80

305

236

373

225 to 350

100

360

280

424

400 to 500

150

487

450

674

600 to 900

200

700

506

739

1000 to 1200

Tests to be conducted on Reflux Valves :

Hydraulic test:

High Pressure Orifice Seat Test:

Subsequent to high pressure on fice performance test, hydraulic pressure shall be reduced up to half of the working pressure to check leakage of orifice seat for a duration of three minutes.

Low Pressure Orifice Seat Test:

Subsequent to high pressure orifice performance test, hydraulic pressure shall be reduced up to half of the working pressure to check leakage of orifice seat for a duration of three minutes.

Body Test:

The valve body (without cover, ball floats) shall be covered by a blank flange, keeping isolating  valve/cock open. Hydrostatic pressure of 1.5 times the pressure rating of the valve shall be applied for a duration of 5 min to check the water tightness of the body.

Float Diameter:

Valve size

Single Air Valve

Double Air Valve (DS1 & 2)

Kinetic Air Valve (DK)

 

Small Orifice

Large Orifice

Small Orifice

Large orifice

Small  Orifice

  Large orifice

15

75

40

--

--

--

--

25

100

75

--

--

--

--

40

100

75

100

75

90

55

50

100

75

100

75

100

75

80

--

--

100

100

115

100

100

--

--

125

125

125

125

150

--

--

125

200

150

200

200

--

--

140

250

150

250

Resilient Seated Cast Iron:  

MARKING :

 Each valve body shall be permanently marked with a plate securely fixed to the body with the following information:

a) Nominal size;

b) Nominal pressure rating:

c) Type of valve:

i) Single air valve S1, S2, etc

ii) Double air valve OS1, DS2, etc

iii) Kinetic air valve (DK)

d) Manufacturers name or trade-mark; and

e) Sl No. and year of manufacture.

NOMINAL PRESSURES:

Reflux valves shall be designated by nominal pressure (PN) defined as maximum permissible gauge working pressure (MPa). The nominal pressure for the various sizes shall be as follows:

Nominal Pressure (PN)

MPa

 

Types

 

Nominal Sizes mm

 

PN 1.0 &

PN 1.6

 

Single air valve (S1)

(Small orifice type) 15, 25, 40 mm

Single air valve (S2)

(Large orifice type) 25,40,50 mm

Double air valve  (DS 1,2)

(All types) 40, 50, 80,100,150,200 mm

Kinetic air valve (DK) 

40, 50, 80, 100, 150 and 200 mm

 Physical Dimensions of Single Air Valve (Small Orifice S1):

Valve size   (mm)

B(Height)      Min

CSQ (Width)

Suitable for Main Size

15

196

118

Up to 100

25

255

158

Upto 100

40

290

158

 Upto 100

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