Page 1344 - Softbound_Edition_19_en

Check valves Check valves
Check valve

cHaracteriSticS Oil viscosity υ = 30 mm /s Non-return valve
2
BDERV3 ∆p = f (Q) BERVA3 BERVB3 hydraulic pilot
Pressure drop charakteristic
1 Pressure drop A --> Cyl. or B --> Cyl. Sandwich construction NG4-Mini ®
2 Pressure drop Cyl. --> A or Cyl. --> B
with check valve fully open • Q max = 20 l/min
p [bar] • p max = 315 bar
25 K0119
1
20
DESCRIPTION FUNCTION APPLICATION
B
A P T 15 A P T B 2 A P T B Sandwich type non-return valve NG4-Mini with In the free flow direction, the volume flow opens Pilot operated non-return valves are used to
10 hydraulic pilot with interface according to Wand- the valve seat against a spring. The spring shut off pressurised hydraulic cylinders, e.g.
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.
5 direction and shut off in the opposite direction. If pressure builds up in the opposite oil port, The hydraulic cylinder can olny be moved in the
0 3 different standard versions are available. The this displaces the pilot piston and opens the shut off direction if a directional valve directs
0 2 4 6 8 Q [l/min] steel sandwich body is phosphatised. Good non-return valve of the closed port. The pilot the volume flow into the opposite port and
performance data and attractive design are the pressure required is dependet on the pressure releases the valve. Reliability in operation is
hall marks of this quality product. held by the valve seat. increased ba a directional valve which connects
dimeNSioNS both oil ports to the tank in the neutral position.
Sandwich type elements NG4-Mini mean that
the system is highly flexible and save both
∅ 4,2 20 10 space and weight.

TYPE CODE
B 4 #
30
Mounting interface acc. to Wandfluh standard

Type list / Function
6,5 94 6,5 in A and B DERV
in A ERVA in B ERVB
40 30
Thickness = 1,2 Nominal size 4-Mini
Dicke = 1,2
Epaisseur = 1,2 Design-Index (Subject to change)

GENERAL SPECIFICATIONS HYDRAULIC SPECIFICATIONS
P Description Non-return valve hydraulic pilot Fluid Mineral oil, other fluid on request
21 11 T A B To 30 Nominal size NG4-Mini acc. to Wandfluh standard Contamination efficiency ISO 4406:1999, class 20/18/14
Construction Sandwich construction (Required filtration grade ß 10…16≥75)
Mounting 3 holes for hexagon socket screw M5 (refer to data sheet 1.0-50)
or studs M5 Viscosity range 12 mm /s…320 mm /s
2
2
10 Connections Connection plates Fluid temperature -20…+70 °C
Mulit-station flange subplate Peak pressure p max = 315 bar
20 Longitudinal stacking system Opening pressure p = 2 bar
ö
Ambient temperature -20…+50 °C Pilot ratio i = 1:8
Mounting position any Max. volume flow Q max = 20 l/min
Fastening torque M = 5,5 Nm (Quality 8.8)
D
Weight m = 0,85 kg
partS liSt
Position Article Description SYMBOLS / TYPES
10 239.2003 Plug G1/2" BDERV4 BERVA4 BERVB4
20 49.2212 Bounded seal 21,5x28,7x2,5
30 173.0650 Seal plate PDSA03
40 160.2045 O-Ring ID 4,5x1,5

Technical explanation see data sheet 1.0-100
A P T B A P T B A P T B

10
5
Wandfluh AG Tel. +41 33 672 72 72 E-mail: sales@wandfluh.com Illustrations not obligatory Data sheet no. Wandfluh AG Tel. +41 33 672 72 72 E-mail: sales@wandfluh.com 20,5 Illustrations not obligatory Data sheet no.
Postfach Fax +41 33 672 72 12 Internet: www.wandfluh.com Data subject to change 2.7-65E 2/2 Postfach Fax +41 33 672 72 12 Internet: www.wandfluh.com Data subject to change 2.7-70E 1/2
CH-3714 Frutigen Edition 03 26 CH-3714 Frutigen Edition 03 26
Page 1344

30

6,5 94 6,5

30 40

P
A B
27 14 T To 40

14
28