Pilot-to-close, spring-biased open, unbalanced poppet logic element with position switch

Cavity: T-19A | Capacity:

Model

LOJOZN

Seal Material

Where to buy

See CAD Files tab below to request images.

Technical features

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.

These valves have positive seals between port 2 and the pilot area.
This cartridge is supplied as a sealed, factory set unit and is not field serviceable. Any tampering will violate the product warranty.
When torquing this cartridge into its cavity, a crow's foot wrench or similar will be required since the position switch precludes the use of a deep socket wrench.
Because these valves are unbalanced, operation is pressure dependent. Opening and closing of the poppet are functions of the force balances on three areas: Port 1 = 100%, Port 2 = 80%, and the Pilot Area = 180%.
These valves are pressure responsive at all ports, therefore it is essential to consider all aspects of system operation through a complete cycle. Pressure changes at any one port may cause a valve to switch from a closed to an open position, or vice versa. All possible pressure changes in the complete circuit must be considered to assure a safe, functional system design.
All ports will accept 5000 psi (350 bar).
Position switch is CE approved.
Incorporates the Sun floating style construction to minimize the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge machining variations.

Technical Data

Cavity
T-19A
Series
4
Capacity
200 gpm
Maximum Operating Pressure
5000 psi
Area Ratio, A3 to A1
1.8:1
Area Ratio, A3 to A2
2.25:1
Maximum Valve Leakage at 110 SUS (24 cSt)
1 drops/min.
Pilot Passage into Valve
.09 in.
Pilot Volume Displacement
.42 in³
Valve Hex Size
1 5/8 in.
Valve Installation Torque
350 - 375 lbf ft
Model Weight
3.10 lb
Seal kit - Cartridge
Buna: 990-019-007
Seal kit - Cartridge
Polyurethane: 990-019-002
Seal kit - Cartridge
Viton: 990-019-006

Switch Specifications

Supply Voltage
20-30 VDC
Operating Temperature Range
-25 to 80 °C
Vibration
≥ 50g, 0-500 impulses/sec
Shock
>50 g, 1ms
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.
Thermal Shift - 0 to 80 °C ≤ ±
.004 in.
EMC
DIN EN 61000-6-1/2/3/4
Connector
M12 X 1 (4) Pin
Connector Environment Rating
IP65

Performance curves

CAD Files

Model CAD Files

Files not yet avialable. Click below to request them.

Frequently asked questions

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