Page 808 - Softbound_Edition_19_en

Pressure relief valves

Pressure relief valve
Screw-in cartridge M18x1,5
• Direct operated
• Q max = 5 l/min ISO 7789
• p max = 400 bar
• p N max = 315 bar

DESCRIPTION FUNCTION APPLICATION
Direct operated pressure relief valve as When the set operating pressure is reached, For limiting the operating pressure in hydraulic
screw-in cartridge with a thread M18x1,5 and the poppet spool opens and connects the pro- systems by releasing the oil from the protec-
cavity according to ISO draft 7789. The valve is tected line with the return line to the tank. By ted oil line P (1) to the outlet/tank return line
available in two different setting versions: Key means of the adjusting mechanism the poppet T (2). The screw-in cartridge is very suitable
setting "S" and turning knob setting "D". Key spool is pressed onto a hardened seat which for mounting in control blocks and is built into
adjustment "S" is also available with cover, see is pressed into the lower cartridge opening by the Wandfluh miniature hydraulics NG3 as a
data sheet 2.0-50. Three standard pressure a helical spring. Thanks to the poppet/spool functional element in sandwich style plates
levels are available: 63, 160 and 315 bar. The principle and the direct operation, these pres- (vertical combination) and flange-mounted
cartridge body made of steel is galvanized and sure reliefe valves are rapid acting and free fo valves (please refer to the separate data sheets
therefore rust-protected. leakage oil. Therefore they are suitable where- in register 2.1). Stepped tools are available
ver no leakage must occur in the system and for making the receptacle bores in steel and
where short opening times are demanded. aluminium (Hire or purchase). Please refer to
the data sheets in register 2.13.
Attention: Should therefore not be utilized any-
more in applications with periodically changing
direction of flow.

TYPE CODE
B S PM18 - #
Pressure relief valve
Direct operated, poppet spool
Type of adjustment Key S
Control knob D
Cover A (see data sheet 2.0-50)
Screw-in cartridge M18x1,5
Pressure range p N 63 bar 63
160 bar 160
315 bar 315
Design-Index (Subject to change)

GENERAL CHARACTERISTICS HYDRAULIC CHARACTERISTICS
Description Direct operated pressure relief valve Hydraulic fluid Mineral oils, other fluids on request
Construction Screw-cartridge for cavity acc. to ISO 7789 Contamination efficiency ISO 4406:1999, class 18/16/13
Mounting Screw thread M18x1,5 (Required filtration grade ß 6…10≥75)
Ambient temperature -20…+50°C refer to data sheet 1.0-50/2
2
2
Mounting position any Viscosity range 12 mm /s…320 mm /s
Fastening M = 30 Nm Fluid temperature -20…+70°C
D
Weight m = 0,11 kg (key) Peak pressure p max = 400 bar
m = 0,12 kg (control knob) p Tmax = p +80 bar
P
Nominal pressure range p = 63 bar, p = 160 bar, p = 315 bar
N
N
N
Minimum pressure see characteristics
Volume flow Q = 0,1…5 l/min
Leakage volume flow Maximum 4 drops/min
SYMBOL
MECHANICAL ACTUATION
P(1) Mechanical types of operation in 2 different versions:
S = Key adjustment by means of Span key
and Allen key
D = Control knob adjustment, fixed
Actuation stroke S = 5 mm
b
Actuation angle α = 1800° (5 revolutions)
b
T(2)
Wandfluh AG Tel. +41 33 672 72 72 E-mail: sales@wandfluh.com Illustrations not obligatory Data sheet no.
Postfach Fax +41 33 672 72 12 Internet: www.wandfluh.com Data subject to change 2.1-520E 1/2
CH-3714 Frutigen Edition 10 19

20 Ø 26

Ø 17 30
s4
40

s13
44,6 52

s19
ø23
M18x1,5 50

30
60

70