 2019 Sun Hydraulics 1 of 2

MODEL

RVCD8

Ventable, pilot-operated, balanced piston relief main stage with integral T-8A

control cavity and drain to port 4

SERIES 1 / CAPACITY: 60 L/min. / CAVITY: T-21A

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 ventable,

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 setting, the modulating element

starts to open to tank (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 4). The vent port (port 3) that tees in between

the main piston and pilot control cartridge, allows the modulating element to also be controlled by remote pilot or 2-

way valves.

TECHNICAL DATA

Cavity T-21A

Series 1

Capacity 60 L/min.

Maximum Operating Pressure 350 bar

Control Pilot Flow 0,11 - 0,16 L/min.

Pilot Control Cavity T-8A

Main stage leakage at 110 SUS (24 cSt) 30 cc/min.@70 bar

Response Time - Typical 10 ms

Valve Hex Size 22,2 mm

Valve Installation Torque 41 - 47 Nm

Seal kit - Cartridge Buna: 990021007

Seal kit - Cartridge EPDM: 990021014

Seal kit - Cartridge Polyurethane: 990021002

Seal kit - Cartridge Viton: 990021006

Model Weight 0.13 kg.

snhy.com/

RVCD8

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

 2019 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

E EPDM

V Viton

TECHNICAL FEATURES

Will accept maximum pressure at port 2; suitable for use in cross port relief circuits.

Main stage orifice is protected by a 150-micron stainless steel screen.

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

Pressure at port 4 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 electro-proportional, solenoid, air pilot, and hydraulic pilot operation. See Pilot Control Cartridges.

Cartridges configured with EPDM seals are for use in systems with phosphate ester fluids. Exposure to petroleum based fluids, greases and lubricants will damage

the seals.

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

RVCD Ventable, pilot-operated, balanced piston relief valve with drain to port 4

Model Code Example: RVCD8WNCONFIGURATION OPTIONS