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CWCL

Load holding valve from Sun Hydraulics.

Description

Vented 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. Backpressure at port 2 does not affect the valve setting because the spring chamber references the vent (port 4).

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

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  • Counterbalance valves should be set at least 1.3 times the maximum load induced pressure.
  • Turn adjustment clockwise to decrease setting and release load.
  • Full clockwise setting is 200 psi (14 bar).
  • All 4-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).
  • 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.
  • Pressure at port 4 is added to the effective relief setting at a rate of 1 plus the pilot ratio times the pressure.
  • Sun counterbalance cartridges can be installed directly into a cavity machined in an actuator housing for added protection and improved stiffness in the circuit.
  • This valve has positive seals between all ports.
  • With vented valves, a lower pilot ratio may be required to achieve machine stability compared to non-vented valves.
  • 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.

Technical Data

Note: Data may vary by configuration. See CONFIGURATION section.

Cavity T-21A
Series 1
Capacity 15 gpm
Capacity (metric) 60 L/min.
Pilot Ratio 2:1
Maximum Recommended Load Pressure at Maximum Setting 4615 psi
Maximum Recommended Load Pressure at Maximum Setting (metric) 320 bar
Maximum Setting 6000 psi
Maximum Setting (metric) 420 bar
Factory Pressure Settings Established at 2 in³/min.
Factory Pressure Settings Established at (metric) 30 cc/min.
Maximum Valve Leakage at Reseat 5 drops/min.
Maximum Valve Leakage at Reseat (metric) 0,3 cc/min.
Check Cracking Pressure 40 psi
Check Cracking Pressure (metric) 2,8 bar
Adjustment – No. of CCW Turns from Min. to Max. Setting 5
Operating Characteristic Standard
Reseat >85% of setting
Valve Hex Size 7/8 in.
Valve Hex Size (metric) 22,2 mm
Valve Installation Torque 30 – 35 lbf ft
Valve Installation Torque (metric) 41 – 47 Nm
Adjustment Screw Internal Hex Size 5/32 in.
Adjustment Screw Internal Hex Size (metric) 4 mm
Locknut Hex Size 9/16 in.
Locknut Hex Size (metric) 15 mm
Locknut Torque 80 – 90 lbf in.
Locknut Torque (metric) 9 – 10 Nm
Model Weight 0.42 lb.
Model Weight (metric) 0.19 kg.
Seal kit – Cartridge Viton: 990021006

Configuration Options

Control

C Tamper Resistant – Factory Set
L Standard Screw Adjustment

Functional Setting Range

F 1000 – 2500 psi (70 – 175 bar), 2000 psi (140 bar) Standard Setting
G 2000 – 6000 psi (140 – 420 bar), 4000 psi (280 bar) Standard Setting

Seal Material

N Buna-N
V Viton

Material/Coating

/AP Stainless Steel, Passivated
/LH Mild Steel, Zinc-Nickel
Cavity: T-21A
Nominal Capacity: 15 gpm (60 lpm )
Pilot Ratio: 2:1
Downloads
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Possible variants

CWCLCFN, CWCL-CFN, CWCLCFN/AP, CWCL-CFN/AP, CWCLCFN/LH, CWCL-CFN/LH, CWCLCFV, CWCL-CFV, CWCLCFV/AP, CWCL-CFV/AP, CWCLCFV/LH, CWCL-CFV/LH, CWCLCGN, CWCL-CGN, CWCLCGN/AP, CWCL-CGN/AP, CWCLCGN/LH, CWCL-CGN/LH, CWCLCGV, CWCL-CGV, CWCLCGV/AP, CWCL-CGV/AP, CWCLCGV/LH, CWCL-CGV/LH, CWCLLFN, CWCL-LFN, CWCLLFN/AP, CWCL-LFN/AP, CWCLLFN/LH, CWCL-LFN/LH, CWCLLFV, CWCL-LFV, CWCLLFV/AP, CWCL-LFV/AP, CWCLLFV/LH, CWCL-LFV/LH, CWCLLGN, CWCL-LGN, CWCLLGN/AP, CWCL-LGN/AP, CWCLLGN/LH, CWCL-LGN/LH, CWCLLGV, CWCL-LGV, CWCLLGV/AP, CWCL-LGV/AP, CWCLLGV/LH, CWCL-LGV/LH

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