 2020 Sun Hydraulics 1 of 2

MODEL

RVCD

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

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

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

Ventable, pilot-operated, balanced piston relief cartridges with external drain are normally closed pressure

regulating valves. When the pressure at the inlet (port 1) reaches the valve setting, the valve starts to open to tank

(port 2), throttling flow to regulate the pressure. They provide a vent port (port 3) that connects between the main

piston and pilot stage to provide for remote control by other pilot or 2-way valves and a drain (port 4) that makes

them insensitive to back pressure. These valves are accurate, have low pressure rise vs. flow, they are smooth and

quiet, and are moderately fast.

TECHNICAL DATA

Cavity T-21A

Series 1

Capacity 60 L/min.

Factory Pressure Settings Established at 15 L/min.

Maximum Operating Pressure 350 bar

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

Maximum Valve Leakage at 110 SUS (24 cSt) 30 cc/min.@70 bar

Response Time - Typical 10 ms

Adjustment - No. of CW Turns from Min. to Max. setting 5

Valve Hex Size 22,2 mm

Valve Installation Torque 41 - 47 Nm

Adjustment Screw Internal Hex Size 4 mm

Locknut Hex Size 15 mm

Locknut Torque 9 - 10 Nm

Seal kit - Cartridge Buna: 990021007

Seal kit - Cartridge EPDM: 990021014

Seal kit - Cartridge Polyurethane: 990021002

Seal kit - Cartridge Viton: 990021006

Model Weight 0.20 kg.

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RVCD

 2020 Sun Hydraulics 2 of 2

(L)CONTROL

L Standard Screw Adjustment

C Tamper Resistant - Factory Set

K Handknob

Y Tri-Grip Handknob

(A)ADJUSTMENT RANGE

A 100 - 3000 psi (7 - 210 bar), 1000 psi

(70 bar) Standard Setting

B 50 - 1500 psi (3,5 - 105 bar), 1000 psi

(70 bar) Standard Setting

C 150 - 6000 psi (10,5 - 420 bar), 1000

psi (70 bar) Standard Setting

D 25 - 800 psi (1,7 - 55 bar), 400 psi (28

bar) Standard Setting

E 25 - 400 psi (1,7 - 28 bar), 200 psi (14

bar) Standard Setting

W 150 - 4500 psi (10,5 - 315 bar), 1000

psi (70 bar) Standard Setting

(N)SEAL MATERIAL

N Buna-N

E EPDM

V Viton

MATERIAL/COATING

Standard Material/Coating

/AP Stainless Steel, Passivated

/LH Mild Steel, Zinc-Nickel

TECHNICAL FEATURES

A remote pilot relief on port 3 (vent) will control the valve below its own setting.

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.

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).

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.

W and Y controls (where applicable) can be specified with or without a special setting. When no special setting is specified, the valve is adjustable throughout its full

range using the W or Y control. When a special setting is specified, this setting represents the maximum setting of the valve.

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

RVCD8 Ventable, pilot-operated, balanced piston relief main stage with integral T-8A control cavity and drain to port 4

Model Code Example: RVCDLANCONFIGURATION OPTIONS