Created on 12/14/2016

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

MODEL

CBDH

10:1 pilot ratio, restrictive counterbalance valve

SERIES 2 / CAPACITY: 20 L/min. / CAVITY: T-2A

3-Port Non-vented

3-Port Non-vented, Fixed Setting

Counterbalance valves with pilot assist are meant to control an overrunning load. The check valve allows free flow

from the directional valve (port 2) to the load (port 1) while a direct-acting, pilot-assisted relief valve controls flow

from port 1 to port 2. Pilot assist at port 3 lowers the effective setting of the relief valve at a rate determined by the

pilot ratio.

Other names for this valve include motion control valve and over-center valve.

TECHNICAL DATA

Cavity T-2A

Series 2

Capacity 20 L/min.

Maximum Recommended Load Pressure at Maximum Setting 270 bar

Maximum Setting 350 bar

Factory Pressure Settings Established at 30 cc/min.

Adjustment - Number of Counterclockwise Turns to Increase Setting 3.75

Operating Characteristic Restrictive

Valve Hex Size 28,6 mm

Valve Installation Torque 61 - 68 Nm

Adjustment Screw Internal Hex Size 4 mm

Locknut Hex Size 15 mm

Locknut Torque 9 - 10 Nm

Seal kit - Cartridge Buna: 990202007

Seal kit - Cartridge Polyurethane: 990002002

Seal kit - Cartridge Viton: 990202006

Model Weight 0.29 kg.

snhy.com/

CBDH

Created on 12/14/2016

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

(L)CONTROL

L Standard Screw Adjustment

C Tamper Resistant - Factory Set

R Lockwired Screw Adjustment

(J)FUNCTIONAL SETTING RANGE

J 2000 - 5000 psi w/25 psi Check (140 -

350 bar w/ 1,7 bar Check), 3000 psi

(210 bar) Standard Setting

C 2000 - 5000 psi w/4 psi Check (140 -

350 bar w/ 0,3 bar Check), 3000 psi

(210 bar) Standard Setting

D 1000 - 2500 psi w/4 psi Check (70 -

175 bar w/ 0,3 bar Check), 2000 psi

(140 bar) Standard Setting

K 1000 - 2500 psi w/25 psi Check (70 -

175 bar w/ 1,7 bar Check), 2000 psi

(140 bar) Standard Setting

(N)SEAL MATERIAL

N Buna-N

V Viton

MATERIAL/COATING

Standard Material/Coating

/LH Mild Steel, Zinc-Nickel

TECHNICAL FEATURES

Counterbalance valves should be set at least 1.3 times the maximum load induced pressure.

Restrictive valves have no relief capacity other than as a thermal relief.

Full clockwise setting is less than 200 psi (14 bar).

Backpressure at port 2 adds to the effective relief setting at a ratio of 1 plus the pilot ratio times the backpressure.

Reseat exceeds 85% of set pressure when the valve is standard set. Settings lower than the standard set pressure may result in lower reseat percentages.

Sun counterbalance cartridges can be installed directly into a cavity machined in an actuator housing for added protection and improved stiffness in the circuit.

Two check valve cracking pressures are available. Use the 25 psi (1,7 bar) check unless actuator cavitation is a concern.

This valve has positive seals between all ports.

All 3-port counterbalance, load control, and pilot-to-open check cartridges are physically interchangeable (i.e. same flow path, same cavity for a given frame size).

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

CBDHX Fixed setting, 10:1 pilot ratio, restrictive counterbalance valve

Model Code Example: CBDHLJNCONFIGURATION OPTIONS