MODEL
LOFOZ
Pilot-to-close, spring biased open, unbalanced poppet logic element with
position switch
SERIES 2 / CAPACITY: 200 L/min. / CAVITY: T-2A
These unbalanced, pilot-to-close logic valves are 2-way switching elements that are spring biased open. Pressure
at either work port 1 or 2 will tend to keep the valve open while pressure at port 3 will tend to close it. The force
generated at port 3 must be greater than the sum of the forces acting at port 1 and port 2 plus the spring force for
the valve to close. NOTE: The pilot area (port 3) is 1.8 times the area at port 1 and 2.25 times the area at port 2.
This valve incorporates a position switch to provide confirmation that the valve is spring biased to the fully open
position.
TECHNICAL DATA
Maximum Operating Pressure 350 bar
Maximum Valve Leakage at 110 SUS (24 cSt) 0,07 cc/min.
Pilot Volume Displacement 1,1 cc
Pilot Passage into Valve 0,9 mm
Area Ratio, A3 to A1 1.8:1
Area Ratio, A3 to A2 2.25:1
Seal kit - Cartridge Buna: 990-202-007
Seal kit - Cartridge Polyurethane: 990-002-002
Seal kit - Cartridge Viton: 990-202-006
SWITCH SPECIFICATIONS
Supply Voltage 20-30 VDC
Reverse Polarity Protection Yes
Maximum Output Load ≤ 400 mA, Duty Ratio 100%
Short Circuit Protection Yes, Load Short Unlimited
Turn On Time ≤ 25 ms
Hysteresis ≤ .002 in.
Operating Temperature Range -25 to 80 °C
Thermal Shift - 0 to 80 °C ≤ ± 0,1 mm
EMC DIN EN 61000-6-1/2/3/4
Vibration ≥ 50g, 0-500 impulses/sec
Shock >50 g, 1ms
snhy.com/
LOFOZ