 2020 Sun Hydraulics 1 of 2

MODEL

RSJC8

Pilot-operated, balanced piston sequence main stage with integral T-8A control

cavity

SERIES 4 / CAPACITY: 480 L/min. / CAVITY: T-19A

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

This valve is a normally closed modulating element that incorporates an integral pilot control cavity. It is externally

drained, and is a balanced piston design. The pilot control cavity will accept any T-8A pressure control cartridge.

When the pressure at the inlet (port 1) reaches the pilot control cartridge's setting, the modulating element starts to

open to port 2, throttling flow to regulate the pressure. The pilot cartridge's setting determines the difference in

pressure between the inlet (port 1) and the drain (port 3). These valves are insensitive to back pressure at port 2 ,

up to the valve setting. They may be used to regulate pressure in place of 2-port relief valves if there is pressure in

the return line.

TECHNICAL DATA

Cavity T-19A

Series 4

Capacity 480 L/min.

Maximum Operating Pressure 350 bar

Control Pilot Flow 0,25 - 0,33 L/min.

Pilot Control Cavity T-8A

Main stage leakage at 110 SUS (24 cSt) 80 cc/min.@70 bar

Response Time - Typical 10 ms

Valve Hex Size 41,3 mm

Valve Installation Torque 474 - 508 Nm

Seal kit - Cartridge Buna: 990019007

Seal kit - Cartridge Polyurethane: 990019002

Seal kit - Cartridge Viton: 990019006

Model Weight 1.19 kg.

sunhydraulics.com/model/

RSJC8

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

 2020 Sun Hydraulics 2 of 2

(W)MINIMUM CONTROL PRESSURE

W 100 psi (7 bar)

D 25 psi (1,7 bar)

(N)SEAL MATERIAL

N Buna-N

V Viton

TECHNICAL FEATURES

All 3 port sequence cartridges are physically and functionally interchangeable (i.e. same flow path, same cavity for a given frame size).

Pilot flow continues to increase as the pressure at port 1 (inlet), relative to the pressure at port 3 (drain), rises above the valve setting.

The main stage orifice is protected by a 150 micron stainless steel screen.

Pressure at port 3 is directly additive to the valve setting at a 1:1 ratio and should not exceed 5000 psi (350 bar).

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 relief cartridge via the T-8A cavity. These pilot control cartridges are

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

Will accept maximum pressure at port 2; suitable for use in cross port relief circuits. If used in cross port relief circuits, consider spool leakage.

Not suitable for use in load holding applications due to spool leakage.

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

RSJC Pilot-operated, balanced piston sequence valve

Model Code Example: RSJC8WNCONFIGURATION OPTIONS