Page 966 - Softbound_Edition_19_en

Proportional pressure relief valve

Proportional pressure relief cartridge
◆ direct operated M22 x 1,5
◆ Q = 25 l/min ISO 7789
max
◆ p = 400 bar x II 2 G Ex db IIC T6, T4
max
◆ p = 350 bar
N max
x II 2 D Ex tb III C T80 °C, T130 °C
x I M2 Ex db I Mb
Class I Division 1
Class I Zone 1

DESCRIPTION APPLICATION
Direct operated proportional pressure relief valve in screw-in These valves are suitable for applications in explosion-hazard
cartridge construction for cavity according to ISO 7789. Good flow areas, open cast and also in mines. The electrical remote control in
capacity due to the differencial area principle, very sensitively conjunction with process controls allows economical solutions
adjustable. When the operating pressure adjusted by means of the with repeatable processes. The screw-in cartridge is perfectly
proportional solenoid is reached, the valve opens and connects the suitable for installation in control blocks and is installed in sand-
protected line with the drain to the tank. The back pressure in T (2) wich- (vertical stacked systems) and in flange plates (correspon -
affects the pressure in P (1). For the control, Wandfluh proportional ding data sheets in this register). For machining the cartridge
amplifiers are available (see register 1.13). The pressure tight cavity in steel and aluminum blocks, cavity tools are available (hire
encapsulated Ex-protection solenoid coil prevents an explosion on or purchase). Please refer to the data sheets in register 2.13.
the inside penetrating to the outside as well as an ignitable surface
temperature.

TYPE CODE
B D B PM22 - - / / - #
Pressure relief valve
Direct operated

Proportional, explosion proof execution Ex d
Screw-in cartridge M22 x 1,5

Execution L9 L15 / L17
Nominal pressure range p [bar] 20 250 20 275
N
80 280 100 315
160 200 350
Nominal voltage U 12 VDC G12
N
24 VDC G24

Ambient temperature up to:
Nominal power P 9 W L9 40 °C or 90 °C
N
15 W L15 70 °C
17 W L17 70 °C (only UL / CSA)
Certification ATEX, IECEx, EAC,
CCC UL / CSA UL
Australia AU MA MA
Sealing material NBR
FKM (Viton) D1

Options without
amplifier M248

Design index (subject to change)
2.3-547

www.wandfluh.com Illustrations are not binding Data subject to change 1/4 Edition: 21 21 2.3-547 E