MODEL
LOECZ
Pilot-to-close, spring biased closed, unbalanced poppet logic element with
metering notches and position switch
SERIES 2 / CAPACITY: 45 L/min. / CAVITY: T-2A
These unbalanced, pilot-to-close logic valves are 2-way switching elements that are spring biased closed. Pressure
at either work port 1 or 2 will oppose the spring and tend to open the valve while pressure at port 3 will tend to
close it. The force generated by the pressure at port 3, plus the spring force, must be greater than the sum of the
forces generated by the pressures at ports 1 and 2 for the valve to remain closed.
This valve incorporates a position switch to provide confirmation that the valve is closed.
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
Transition leakage at 110 SUS (24 cSt) 30 cc/min.@70 bar
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
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LOECZ