MODEL
LOJC
Pilot-to-close, spring biased closed, unbalanced poppet logic element
SERIES 4 / CAPACITY: 760 L/min. / CAVITY: T-19A
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 at port 3, plus the spring force, must be greater than the sum of the forces acting at
port 1 and port 2 for the valve to remain closed. NOTE: The pilot area (port 3) is 1.8 times the area at port 1 and
2.25 times the area at port 2.
TECHNICAL DATA
Maximum Operating Pressure 350 bar
Maximum Valve Leakage at 110 SUS (24 cSt) 0,7 cc/min.
Pilot Volume Displacement 6,9 cc
Pilot Passage into Valve 2,3 mm
Area Ratio, A3 to A1 1.8:1
Area Ratio, A3 to A2 2.25:1
Seal kit - Cartridge Buna: 990-019-007
Seal kit - Cartridge Polyurethane: 990-019-002
Seal kit - Cartridge Viton: 990-019-006
(X)CONTROL
X Not Adjustable
(D)CRACKING PRESSURE
D 50 psi (3,5 bar)
(N)SEAL MATERIAL
N Buna-N
V Viton
MATERIAL/COATING
Standard Material/Coating
/AP Stainless Steel, Passivated
snhy.com/LOJC
TECHNICAL FEATURES
These valves have positive seals between port 2 and the pilot area.
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).
Corrosion resistant cartridge valves are intended for use in corrosive environments and are identified by the model code suffix /AP for external stainless steel
Model Code Example: LOJCXDNCONFIGURATION OPTIONS