Page 1342 - Softbound_Edition_19_en

Non-return valve Check valves
Check valve

PERFORMANCE SPECIFICATIONS Non-return valve
Oil viscosity u = 30 mm /s hydraulic pilot ®
2
∆p = f (Q) Pressure drop volume flow characteristics Unblocking ratio = f (p1) Sandwich construction NG3-mini
• Q = 8 l/min
p [bar] [ - ] max
12 K0388 4 K0389 • p max = 315 bar
2 → 1
9 pa= 5 bar 3
1 → 2
6 2 deScriptioN fuNctioN applicatioN
Sandwich type non-return valve NG3-Mini with In the free flow direction, the volume flow opens Pilot operated non-return valves are used to
3 2 → 1 1 hydraulic pilot with interface according to Wand- the valve seat against a spring. The spring shut off pressurised hydraulic cylinders, e.g.
pa= 2 bar fluh standard. The valves allow a free flow in one helps the valve close in the opposite direction. in lifting or clamping fixtures, without leaking.
0 0 direction and shut off in the opposite direction. If pressure builds up in the opposite oil port, The hydraulic cylinder can only be moved
0 25 50 75 100 125 150 Q [l/min] 0 50 100 150 200 250 300 350 p1 [bar] 3 different standard versions are available. The this displaces the pilot piston and opens the in the shut off direction if a directional valve
steel sandwich body is phosphatised. Good non-return valve of the closed port. The pilot directs the volume flow into the opposite port
performance data and attractive design are the pressure required is dependet on the pressure and releases the valve. Reliability in operation
hall marks of this quality product. held by the valve seat. is increased be a directional valve which con-
DIMENSIONS HYDRAULIC CONNECTION nects both oil ports to the tank in the neutral
Cavity drawing according to ISO 7789–33–06–0–98 position. Sandwich type elements NG3 mean
that the system is highly flexible and save both
s36 M33x2 space and weight.
20 Ø40 type code

10 (3) B 3 #

3(X) (2) Mounting interface acc. to Wandfluh standard
M33x2 Type list / Function

86.5 30 (1) (1) in A ERVA in B ERVB
in A and B DERV

66.5 20 Note! For detailed cavity drawing and cavity tools see data Nominal size 3-Mini

sheet 2.13-1011 Design-Index (Subject to change)
2(T) 50

GeNeral SpecificatioNS Hydraulic SpecificatioNS
40 Description Non-return valve hydraulic pilot Fluid Mineral oil, other fluid on request

1(P) Nominal size NG3-Mini acc. to Wandfluh standard Contamination efficiency ISO 4406:1999, class 20/18/14
Construction
(Required filtration grade ß 10…16≥75)
Sandwich construction

Mounting 3 holes for hexagon socket screw M4 refer to data sheet 1.0-50/2
2
2
or studs M4 Viscosity range 12 mm /s…320 mm /s
Connections Connection plates Fluid temperature -20…+70 °C
SEALING MATERIAL SURFACE TREATMENT Multi-station flange subplate Peak pressure p max = 315 bar
Longitudinal stacking system
p = 2 bar
Opening pressure
ö
NBR or FKM (Viton) as standard, choice in the type code ◆ The cartridge body is zinc-nickel coated Ambient temperature -20…+50 °C Pilot ratio i = 1:8
Mounting position any Max. volume flow Q max = 8 l/min
Fastening torque M = 2,8 Nm (Quality 8.8)
D
PARTS LIST STANDARDS Weight m = 0,56 kg
Position Article Description Cartridge cavity ISO 7789
10 160.2298 O-ring ID 29,82 x 2,62 (NBR) Contamination ISO 4406 SymbolS / typeS
160.6296 O-ring ID 29,82 x 2,62 (FMK) efficiency BDERV3 BERVA3 BERVB3
20 160.2252 O-ring ID 25,12 x 1,78 (NBR)
160.6252 O-ring ID 25,12 x 1,78 (FKM)
30 049.3296 Back-up ring rd 26,1 x 29,4 x 1,4 ACCESSORIES
40 160.2236 O-ring ID 23,52 x 1,78 (NBR) Technical explanations Data sheet 1.0-100
160.6236 O-ring ID 23,52 x 1,78 (FKM) Hydraulic fluids Data sheet 1.0-50
50 049.3276 Back-up ring rd 24,1 x 27 x 1,4 Filtration Data sheet 1.0-50
A P T B A P T B A P T B

Wandfluh AG Postfach CH-3714 Frutigen
Tel. +41 33 672 72 72 Fax +41 33 672 72 12 sales@wandfluh.com
Wandfluh AG Tel. +41 33 672 72 72 E-mail: sales@wandfluh.com Illustrations not obligatory Data sheet no.
www.wandfluh.com Illustrations are not binding Data subject to change 2/2 Edition: 18 44 2.7-62 E Postfach Fax +41 33 672 72 12 Internet: www.wandfluh.com Data subject to change 2.7-65E 1/2
CH-3714 Frutigen Edition 03 26
Page 1342
∅ 4,2 20 10

30

6,5 94 6,5

40 30
Thickness = 1,2
Dicke = 1,2
Epaisseur = 1,2

P
21 11 T A B To 30

10
20