 2018 Sun Hydraulics Corporation 1 of 2

MODEL

RSHC8

Pilot operated, balanced piston sequence main stage with integral

T-8A control cavity

SERIES 3 / CAPACITY: 240 L/min. / CAVITY: T-17A

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-17A

Series 3

Capacity 240 L/min.

Maximum Operating Pressure 350 bar

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

Response Time - Typical 10 ms

Pilot Control Cavity T-8A

Main stage leakage at 110 SUS (24 cSt) 65 cc/min.@70 bar

Valve Hex Size 31,8 mm

Valve Installation Torque 203 - 217 Nm

Seal kit - Cartridge Buna: 990017007

Seal kit - Cartridge Polyurethane: 990017002

Seal kit - Cartridge Viton: 990017006

Model Weight 0.49 kg.

snhy.com/

RSHC8

 2018 Sun Hydraulics Corporation 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

RSHC Pilot operated, balanced piston sequence valve

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: RSHC8WNCONFIGURATION OPTIONS