Created on 02/24/2016

 2016 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 1 of 2

MODEL

LODA8

Vent-to-open, spring biased closed, unbalanced poppet logic element with pilot

source from port 1 and integral T-8A control cavity

SERIES 1 / CAPACITY: 95 L/min. / CAVITY: T-11A

This valve is an unbalanced, vent-to-open, 2-way logic switching element with an integral pilot control cavity. It is

spring biased closed and uses port 1 as a pilot source. With a pilot 2-way valve in the closed position installed in the

T-8A cavity, the logic element will remain in the closed position. With the pilot valve open, the logic element will

open providing there is a sufficient combination of pressures to overcome the spring force. 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

Pilot Volume Displacement 0,66 cc

Area Ratio, A3 to A1 1.8:1

Area Ratio, A3 to A2 2.25:1

Pilot Control Cavity T-8A

Control Orifice Diameter 0,53 mm

Seal kit - Cartridge Buna: 990-011-007

Seal kit - Cartridge Polyurethane: 990-011-002

Seal kit - Cartridge Viton: 990-011-006

(D)CRACKING PRESSURE

D 50 psi (3,5 bar)

(N)SEAL MATERIAL

N Buna-N

V Viton

snhy.com/

LODA8

TECHNICAL FEATURES

These valves have positive seals between port 2 and the pilot area.

NOTE: With the -8 control option, the main stage valve should first be installed to the correct torque value. The T-8A pilot control valve should then be installed into

the main stage valve to its required torque value.

The -8 control option allows the pilot control valve to be incorporated directly into the end of the logic cartridge via the T-8A cavity. These pilot control cartridges are

sold separately and include electro-proportional, solenoid, air pilot, and hydraulic pilot operation. See Pilot Control Cartridges.

Compound cartridge (pilot and main stage) assembly information is provided for reference only. Cartridges must be ordered separately and assembled at

point of use.

NOTES

Model Code Example: LODA8DNCONFIGURATION OPTIONS

Created on 02/24/2016

 2016 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 2 of 2

These valves open quickly when vented. Time to close is difficult to predict as it is dependant on the rate of flow and the pressure drop created as it closes.

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).

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.

PERFORMANCE CURVES

RELATED MODELS

LODA Vent-to-open, spring biased closed, unbalanced poppet logic element with pilot source from port 1