7/27/2019 Gestra Sandwich Check Valve RK76

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Non-Return ValvesPN 6/10/16/25/40DN 15-100mm(1/2-4) A2RK 76

GESTRA DISCO Non-Return ValvesRK 76

Issue Da te: 10/00

Application for liquids, ga ses and vapours.

[mm] 15 100Nominal sizes DN [in] 1/2 4

Nomina l press ure P N 401)

Max. se rvice p ressure [ba rg] 40 35 32 28for RK 76 [ps ig ] 580 508 464 406

[ C ] 20 100 200 300Related temperature [ F] 68 212 392 572

Minimum temperature 2) 10 C (14 F)

Pressure/Temperature Rating

1) Also rated for ANSI clas s 300, but see flange d etails b elow.2) Minimum temperature a t nominal pressure rating.

Tight shut-off in acc orda nce w ith DIN 3230, part 3, leakrate B N2/BO3.

Connections of wafer-type valves 3)

Dimensions

Materials

Va lves for universa l fitting betw een flang es to

DIN B S AS ME

DIN 2501 (B S 4504) B S 10 AS ME B 16.1 c la ss 125 FFP N 6/10/16/25/40 t a ble s D , E, F, H, J 4) AS ME B 16.5 c la ss 150/300 RF

BS 4504

3

) With universa l centering ring.4) Tab les D/E, DN 65mm a nd DN 80 mm (2 1/2 and 3 ): C hoose nominal size one size s maller eac h.

DN[mm] 15 20 25 32 40 50 65 80 100[in] 1/2 3/4 1 11/4 11/2 2 21/2 3 4

Dimensions L5) 16 19 22 28 31.5 40 46 50 60

in mm D 45 55 65 75 85 98 118 134 159

Weight [kg] 0.18 0.3 0.45 0.7 0.9 1.5 2.1 3.4 5.2

5) Overall length a cco rding to DIN EN 558-1, series 49 (=^ DIN 3202, pa rt 3, series K4)

DN 15-100 mm (1/2 4 ) DIN reference AS TM eq uivalent

Body, seatG -X 8 C rNi 13 1.4008 A 217-C A 15

and guide ribs

Valve d isc, spring retainerX 6 CrNiMo Ti 17 12 2 1. 4571

A 182 F 316

S pring A 313 Type 316

C entering ring X 12 C rNi 17 7 1.4310 Type 302

L

D

7/27/2019 Gestra Sandwich Check Valve RK76

2/2

Non-Return ValvesPN 6/10/16/25/40DN 15-100mmA2 (1/2-4)

RK 76

GESTRA GmbH

P. O.B ox 105460, D-28054 Bremen

Hemmstrae 130, D-28215 Bremen

Tel. + 49 (0) 421 35 03-0

Fa x + 49 (0) 421 35 03-393

Internet ww w.ges tra.d e

Supply in accordance with our general termsof business.

Tec hnica l mod ifica tions reserved.

1998 GES TRA Gmb H BREMEN Printed in Ge rmany

810294-01/1000

Opening pressures

Differential pressures at zero volume flow

DN Opening press ures in mba r

Direction of flow

with sp rings

[mm] [in]

15 1/2 25 22.5 2020 3/4 25 22.5 2025 1 25 22.5 2032 11/4 27 23.5 2040 11/2 28 24.0 2050 2 29 24.5 2065 21/2 30 25.0 2080 3 31 25.5 20

100 4 33 26.5 20

1 mbar=^

0.0145 psi=^

10mm w.g.=^

0.4in w.g.

Pressure Drop Chart

The c urves given in the chart a re valid for w ate rat 20 C. To read the pressure drop for other

fluids the equivalent water volume flowratemust be ca lculated and used in the graph.

The va lues indica ted in the c hart a re applica bleto spring-loaded valves with horizontal flow.With vertical flow insignificant deviationsoccur only within the range of partial opening.

V.

W = V.

1000

V.

W = Equivalent wa ter volume flowin l/s etc.

= Density of fluid (operating condition)

in kg /m3 et c .

V.

= Volume of fluid (operating condition)in l/s etc.

Enquiry Specification

G ES TRA DISC O non-return valves RK76.Wafer design with extremely short overalllength to DIN EN 558-1, table 11, series 49=^ DIN 3202, part 3, series K4)

Suitable for fitting between flanges to DIN,BSor AS ME FF.

Indications on pressure, nominal size (DN),bod y ma terial.

Order Specifications

Type RK 76, DN. .Metal-to-metal

Fluid, flowrate, pressure and temperature.Type o f pipe fla ng es .

NoteThe valves should not be use d on compresso rs

or where pulsating flow exists.For these a pplica tions pleas e c onsult us.

m3/h l/s DNmm

W en seect ng va ve p easecons er

Partial opening Full opening=instablerange =stable range

Imp.gal/min

Press ure drop p 1 US gallon 0.833 Imp. ga llon

Volu

meflow

Vw.

ba r