vacuum breaker safety valve - alma valves · model 795 vacuum breaker safety valve the valve acts...
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Model 795
Vacuum breaker safety valve
The valve acts as an automatic regulator of pressure drops and preventsthe creation of a vacuum inside pressurised installations or vessels.In compliance with the ATEX 94/9/CE directive “Protective equipment andsystems for use in potentially explosive atmospheres”.
Specifications—aActivated by direct action helicoid spring.
—aSimplicity of construction ensuring minimum maintenance. .
—aInternal body designed to offer favourable flow profile.
—aSoft seals giving greater tightness then that required by EN 12266-1, as long as the valve, in non operating conditions, is under—aequal or greater pressure than atmospheric pressure.
—aGreat discharge capacity.
—aAll the valves are supplied sealed at the set depressurising re-—aquested, simulating operational conditions, and are vigorously tes-—ated.
—aAll components are numbered, registered and checked. If re-—aquested in advance, material, casting, test and efficiency certi-—aficates will be enclosed with the valve.
N°. PIECE PIECEMATERIAL
BRASS STAINLESS STEEL
01
02
03
04
05
06, 8
07
09
10
11
12
13
Body
Spring press
Spring
Shaft
Plug
Washer
Seal
Nut
Sealing wire
Charactetistic plate
Seal
Deflector
Brass (EN-CW617N)
Brass (EN-CW617N)
Stainless steel (EN-1.4310)
Stainless steel (EN-1.4305)
Brass (EN-CW617N)
Stainless steel (EN-1.4401)
Fluorelastomer (Vitón) (2)
Silicone's rubber (3)
Stainless steel (EN-1.4401)
Sealing wire
Aluminium
Plastic
Stainless steel (EN-1.4401)
Stainless steel (EN-1.4401)
Stainless steel (EN-1.4305)
Stainless steel (EN-1.4310)
Stainless steel (EN-1.4305)
Stainless steel (EN-1.4401)
Stainless steel (EN-1.4401)
Fluorelastomer (Vitón) (2)
Silicone's rubber (3)
Stainless steel (EN-1.4401)
Sealing wire
Aluminium
Plastic
Stainless steel (EN-1.4401)
DN
PN
PRESSURE IN bar
MAXIMUM TEMP. IN °C (1)
MINIMUM TEMP. IN °C
OPERATINGCONDITIONS
(1) For temperatures upper 150°C special seal. For temperatures upper 300°C special seal and spring.(2) Recommended temperature field -30°C to + 150°C. Maximum pressure of service 12 bar.(3) Recommended temperature field -50°C to + 115°C. Maximum pressure of service 9 bar.
3/8" to 1"
16
-50
16
120
12
150
16
-50
16
120
12
150
1
2
IMPORTANT
1.- Fluorelastomer (Vitón) seals or Silicone's rubber, achieving leakage levels less than .
1.- as long as the valve, in non operating conditions, is under equal or greater pressure than atmos-1.- pheric pressure.Depending on demand:
1.- Buna-nitryls seals, Butyl, Natural rubber, E.P.D.M., Chlorosulphonate polyethylene (Hypalon),1.- Neoprene, ...etc.
2.- The intake deflector prevents the entry of foreign bodies in the valve which will affect later2.- operation. (Specially designed for moving transport).
3.- Possibility of manufacture in other types of material, for use in special working conditions (high3.- temperatures, fluids,... etc.).
0,3 x 10-3 Pa cm3
sec.
AIR
5
pd [bar]
0 0,1 0,2 0,3 0,4 0,5 0,6 0,7
1"
pd = Relative set depressurising [bar].
10
15
20
25
30
35[Nm3/h]
3/4"
1/2"
3/8"
• Stainless steel (EN-1.4401).
CONNECTIONS
d0
H
A
B
D
S
R
20,00
275,68
105
24,00
9,50
65
40 (41) •
0,78
0,80
5101
5102
Whitworth gas-tight cylindrical male thread ISO 228/1 1978 (DIN-259)
3/8" 1/2" 3/4" 1"
16,50
180,64
90
21,00
8,00
65
35 (36) •
0,46
0,51
5341
5342
12,50
89,53
81
16,50
5,50
65
32
0,36
0,34
5021
5022
9,50
51,25
64
13,00
4,25
40
24
A0 = (d02 - d1
2)π4
BRASS
STAINLESS STEEL
BRASS2002-795.
STAINLESS STEEL2002-795.
0,15
0,19
5381
5382
R
3/8"
1/2"
3/4"
1"
64
81
90
105
A
13,00
16,50
21,00
24,00
C
51,00
64,50
69,00
81,00
L
09
12
15
18
E
13,90
17,80
22,00
27,50
F
20,00
25,50
34,00
42,00
D
40
65
65
65
K
063
080
095
106
G
24
32
40
50
J
12,00
15,50
20,00
25,00
H
Example of installation
R
0,40
0,05
56199
56200
56201
56202
20,00
7,20
0,36
3/8" 1/2" 3/4" 1"
0,40
0,05
56195
56196
56197
56198
16,50
5,94
0,36
0,40
0,05
56191
56192
56193
56194
12,50
4,50
0,36
0,40
0,05
56187
56188
56189
56190
9,50
3,42
0,36
MAXIMUM
MINIMUM
CODE
CODE
CODE
CODE
0,05 to 0,10
0,09 to 0,20
0,19 to 0,30
0,29 to 0,40
SETDEPRESSURISINGIN bar
AIR
2,5
10
OVERDEPRESSURE FACTORS
Overdepressure in %
Multiply the absortion capacityobtained from the graphic, bythe correction factor, in orderto obtain the absortioncapacity at requiredoverdepressure.
% Δ pd
15 20 25 30 35 40
2,0
1,5
1,0
α d
AIR0,20
0,15
0,10
pd [bar]
0 0,1 0,2 0,3 0,4 0,5 0,6 0,7
1/2"3/4"3/8"1"
pd = Relative set depressurising [bar].
d0
h
h/d0
Informative brochure, without obligation and subject to our General Sales Conditions.
89136/14
Founded in 1914
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