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Pressure relief valve
Pressure relief valve Pressure relief valve

GENERAL SPECIFICATIONS HYDRAULIC SPECIFICATIONS DIMENSIONS
Designation Pressure relief valve Working pressure p = 450 bar BESPU10-420 BESPU10-63
max
Construction Direct operated Tank pressure p = 210 bar
T max
Mounting Screw-in cartridge construction Nominal pressure p = 63; 420 bar
N
Nominal size 7 ⁄8 “-14 UNF according to Wandfluh range
standard Minimum pressure See characteristics
Actuation Manually Volume flow range Q = 0,1…50 l/min
Ambient temperature -25…+90 °C Leakage oil Seat tight, max. 0,15 ml / min (approx. 3
Weight 0,30 kg (420 bar) drops / min) at 30 cSt
0,24 kg (63 bar) Fluid Mineral oil, other fluid on request
MTTFd 150 years Viscosity range 12 mm /s…320 mm /s
2
2
Temperature range -25…+90 °C (NBR)
fluid -20…+90 °C (FKM)
Contamination Class 18 / 16 / 13
efficiency
Filtration Required filtration grade ß 6…10 ≥ 75, 50
see data sheet 1.0-50
PERFORMANCE SPECIFICATIONS 70
2
Oil viscosity u = 30 mm /s 60
p = f (Q) Pressure volume flow characteristics p = f (Q) Pressure volume flow characteristics
Maximal adjustable pressure Minimal adjustable pressure

p [bar] p [bar]
500 K4056 60 K4057 HYDRAULIC CONNECTION PARTS LIST
400 50 Cavity drawing according to Wandfluh standard Position Article Description
40
300
30 7/8"-14UNF-2B 50 160.2188 O-ring ID 18,77 x 1,78 (NBR)
200 160.6188 O-ring ID 18,77 x 1,78 (FKM)
20
100 10 160.2120 O-ring ID 12,42 x 1,78 (NBR)
0 0 160.6124 O-ring ID 12,42 x 1,78 (FKM)
0 10 20 30 40 50 Q [l/min] 0 10 20 30 40 50 Q [l/min] (2) 049.3166 Backup ring rd 13,1 x 16 x 1,4

SURFACE TREATMENT ACCESSORIES (1)
◆ The cartridge body is zinc-nickel coated Types of adjustment for screw-in Data sheet 2.0-50
cartridges Note! For detailed cavity drawing and cavity tools see data
sheet 2.13-1054
Technical explanations Data sheet 1.0-100
Hydraulic fluids Data sheet 1.0-50
Filtration Data sheet 1.0-50

SEALING MATERIAL INSTALLATION NOTES
NBR or FKM (Viton) as standard, choice in the type code Mounting type Screw-in cartridge ⁄8 “-14 UNF
7
Mounting position Any
Tightening torque M = 60 Nm Screw-in cartridge
D

STANDARDS

Cartridge cavity ISO 7789
Contamination ISO 4406
efficiency
Wandfluh AG Postfach CH-3714 Frutigen
Tel. +41 33 672 72 72 Fax +41 33 672 72 12 sales@wandfluh.com

www.wandfluh.com Illustrations are not binding Data subject to change 2/3 Edition: 18 44 2.1-590 E www.wandfluh.com Illustrations are not binding Data subject to change 3/3 Edition: 18 44 2.1-590 E
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