Issue Date: 3/09
GESTRA Steam Systems
DISCO Non-Return Valves
RK 76 for Flanges PN 6/10/16/25/40, DN 15-100
ASME Class 150/300
Description
Wafer-type non-return (check) valve for sandwiching between flanges. Valve with spring for installation in any position.
Without spring only for vertical lines with upward flow. Self-centering valve body ensures accurate installation. Application
for liquids, gases and vapours. Please observe the classification according to the Pressure Equipment Directive (PED).
Pressure / Temperature Rating
RK 76 DIN, EN, ASME B16.5, Class 300
[°C] – 10 20 100 200 300
DN 15 – 100
[bar] g
Valve disc gasket t
Metal-to-metal
RK 76, DN 15-100
PTFE*) –190 250 Corrosive fluids DIN EN 12266, Class D
EPDM*) –40 150 Water, condensate, vapours DIN EN 12266, Class A
FPM*) –25 200 Mineral oils, gases, air DIN EN 12266, Class A
Please check the chemical suitability of the valve for the application in question or, if in doubt, consult us.
*) Observe pressure/temperature limits of the equipment!
49.6 49.6 42.3 35.8 31.6 metal-to-metal (standard)
49.6 49.6 42.3 35.8 31.6
[°C] t
min
–10 300 Liquids, gases, vapours DIN EN 12266, Class D
[°C] Application Leakage rate
max
Design
metal-to-metal
with Nimonic® springs
Product Range A2
RK 76
DN 15-100
End Connections
DIN ASME BS 101) JIS
EN 1092-1
PN 10/16/25/40
1
) Table D, E, DN 65, DN 80: Select DN one size smaller.
B 16.1 Class 125 FF
B 16.5 Class 150/ 300 RF
Table D, E, F, H, J
B2238
10K
Dimensions
Valve size
Face-to-face
dimensions
∅ D PN 6-40 45 55 65 75 85 98 118 134 154
Weight [kg] 0.18 0.30 0.45 0.70 0.90 1.50 2.10 3.40 5.20
2
) Short overall length according to EN 558-1, series 49
[mm] 15 20 25 32 40 50 65 80 100
[Inch] ½ ¾ 1 1¼ 1½ 2 2½ 3 4
[mm] L2) 16 19 22 28 31.5 40 46 50 60
^ DIN 3202-3, series K4)
(
=
Materials
DN 15– 100 DIN/EN ASTM Category
Body, seat and
guide ribs
Valve disc, spring retainer
Spring Austenitic stainless steel
Spiral centering ring 1.4310 Chromium steel
RK 76 1.4107 ASTM A217 CA15 Chromium steel
1.4571
Austenitic stainless steel
∅ D
L
DISCO Non-Return Valves
100
80
65
50
40
32
25
20
15
[m /h]
3
[l/s]
100
10
1
0,1
30
20
10
6
4
3
2
1
0,6
0,4
0,3
0,2
0,1
0,06
0,04
0,03
0,02
0,01
[bar]
0,01
0,02
0,03
0,04
0,06
0,1
0,2
0,3
0,4 0,5
DN
[Lmp.
Gal/min.]
0,1
400
300
200
100
60
40
30
20
10
6
4
3
2
1
0,6
0,4
0,3
0,2
[psi]
0,1
0,2 0,3
0,4
0,6
1 2
3
4
5
6 7
RK 76
for Flanges PN 6/10/16/25/40,
DN 15-100, ASME Class 150/300
Opening Pressures
Differential pressures at zero volume flowrate
DN Opening pressures [mbar]
Direction of flow in valve
without
spring
r r q o
15
20
25
32
40
50
65
80
100
On request at extra charge, special springs for opening
pressures:
Between 5 and 1000 mbar for DN 15 – 50 mm,
between 5 and 700 mbar for DN 65 and 80.
2.5
2.5
2.5
3.5
4.0
4.5
5.0
5.5
6.5
10
10
10
12
13
14
15
16
18
with springs
7.5
7.5
7.5
8.5
9
9.5
10
10.5
11.5
5
5
5
5
5
5
5
5
5
Pressure Drop Chart
The curves given in the chart are valid for water at 20 °C.
To read the pressure drop for other fluids the equivalent
water volume flowrate must be calculated and used in
the graph.
The values indicated in the chart are applicable to
spring-loaded valves with horizontal flow. With vertical
flow insignificant deviations occur only within the range
of partial opening.
Partial opening =
instable range
[Imp gal/min] [m3/h]
˙
V
= V˙ ·
w
˙
V
Equivalent water volume flow
w =
in l/s or m³/h
ρ = Density of fluid
(operating condition) in kg/m³
˙
V
= Volume of fluid
operating condition) in [l/s] or [m³/h]
ρ
1000
Full opening =
stable range
Enquiry Specification
GESTRA DISCO Non-return valve type RK 76, wafer design
with extremely short overall length to EN 558-1, table 11,
series 49. Body with spiral centering ring.
Broad sealing surfaces at body inlet and outlet. Designed
in accordance with PED 97/28/EC.
Type: RK 76
Connection: Wafer design for sandwiching
between flanges
Nominal size: DN 15 / DN 20 / DN 25 / DN 32 /
DN 40 / DN 50 / DN 65 / DN 80 /
DN 100
Pressure:
CL 125 FF / CL 150 / CL 300 RF
Seating surface: metal-to-metal / PTFE / EPDM / FPM
Certificates: Test certificate to
EN 10204, 2.1 / 2.2 / 3.1.
Please note:
The selected non-return valve must ensure that the
minimum volume flowrate keeps the valve disk in the open
position (see Pressure Drop Chart / stable range). Valve
construction is very robust, but they are not recommended
for use on compressors or where pulsating flow exists. If in
doubt please consult us and we will carry out the pressure
drop calculation and select a suitable valve.
Supply in accordance with our general terms
of business.
GESTRA AG
P. O. Box 10 54 60, D-28054 Bremen
Münchener Str. 77, D-28215 Bremen
Telephone 0049 (0) 421 35 03- 0, Fax 0049 (0) 421 35 03-393
E-Mail gestra.ag@flowserve.com, Internet www.gestra.de
810294-03/309cm · 2007 GESTRA AG · Bremen · Printed in Germany
PN 6 / PN 10 / PN 16 / PN 25 / PN 40 /
w
.
Volume flow V
Pressure drop ∆ρ
When ordering please state:
Fluid, flowrate, service pressure and temperature, standard
of pipe flange.
The following test certificates can be issued on request, at extra cost:
In accordance with EN 10204-2.1, -2.2 and 3.1
All inspection requirements have to be stated with the
order. After supply of the equipment certificates can no
longer be established. Charges and extent of the above
mentioned certificates as well as the different tests confirmed therein are listed in our price list “Test and Inspection Charges for Standard Equipment”.
For other tests and inspections than those listed above,
please consult us.
PED (Pressure Equipment Directive)
The equipment complies with the requirements of the
Pressure Equipment Directive 97/23/CE. Applicable with
fluids of group 1 and 2. With CE marking (apart from
equipment that is excluded from the scope of the PED
according to section 3.3). For more information refer to
our PED Declaration of Conformity.
ATEX (Atmosphère Explosible)
The equipment does not have its own potential source of
ignition and is therefore excluded from the scope of the
ATEX Directive 94/9/CE.
Applicable in Ex zones 0, 1, 2, 20, 21, 22 (1999/92/CE).
The equipment does not bear an Ex marking. For more
information refer to our ATEX Declaration of Manufacturer.
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