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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