 2022 Sun Hydraulics 1 of 2

MODEL

LOFO

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

SERIES 2 / CAPACITY: 200 L/min. / CAVITY: T-2A

(L)CONTROL

L Stroke Adjustment

X Not Adjustable

(D)MINIMUM PILOT PRESSURE

D 50 psi (3,5 bar)

(N)SEAL MATERIAL

N Buna-N

V Viton

MATERIAL/COATING

Standard Material/Coating

/AP Stainless Steel, Passivated

CONFIGURATION

L Control Stroke Adjustment

D Minimum Pilot

Pressure

50 psi (3,5 bar)

N Seal Material Buna-N

(none) Material/Coating Standard

Material/Coating

NOTE: DATA MAY VARY BY CONFIGURATION. SEE CONFIGURATION SECTION.

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.

TECHNICAL DATA

Cavity T-2A

Series 2

Capacity 200 L/min.

Maximum Operating Pressure 350 bar

Maximum Valve Leakage at 110 SUS (24 cSt) 0,7 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

Valve Hex Size 28,6 mm

Valve Installation Torque 61 - 68 Nm

Seal kit - Cartridge Buna: 990202007

Seal kit - Cartridge Polyurethane: 990002002

Seal kit - Cartridge Viton: 990202006

Model Weight 0.30 kg.

sunhydraulics.com/model/

LOFO

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

components, or /LH for external zinc-nickel plated components. See the CONFIGURATION section for all options. For further details, please see the Materials of

Construction page located under TECH RESOURCES.

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.

Model Code Example: LOFOLDNCONFIGURATION OPTIONS