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Model
CWIALHN
3:1 pilot ratio, vented counterbalance valve
Cavity: T-24A | Capacity:
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Model
CWIALHN
Technical specifications
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.
- 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.
- Cavity
- Series
- Capacity120 gpm
- Pilot Ratio3:1
- Maximum Recommended Load Pressure at Maximum Setting3075 psi
- Maximum Setting4000 psi
- Adjustment - No. of CCW Turns from Min. to Max. Setting5
- Check Cracking Pressure20 psi
- Factory Pressure Settings Established at2 in³/min.
- Maximum Valve Leakage at Reseat5 drops/min.
- Operating CharacteristicStandard
- Reseat>85% of setting
- Valve Hex Size1 5/8 in.
- Valve Installation Torque350 - 375 lbf ft
- Adjustment Screw Internal Hex Size5/32 in.
- Locknut Hex Size9/16 in.
- Locknut Torque80 - 90 lbf in.
- Model Weight3.50 lb
- Seal kit - Cartridge
- Seal kit - Cartridge
- Seal kit - Cartridge
Model CAD Files
Symbol CAD Files
Why is turning the adjust screw for counterbalance valves opposite of most other valves?
What parts of the Sun cartridge valve are field serviceable?
You say your valves leak 5 drops/min. How can I keep my load from drifting?
How do I determine the setting of a counterbalance valve?
How do I know how much pilot pressure is required to lower a load with a counterbalance valve?
When should I use a vented counterbalance valve?
How does Sun test a counterbalance valve for leakage?
How do I decide which pilot ratio to select?
How big is a drop of hydraulic oil?
Why can't I use a counterbalance valve in a closed loop transmission circuit?
What do you mean by the setting of a counterbalance valve and what should it be?
I don't need pilot assist. Can I just block port 3?
Can I use an atmospherically vented counterbalance valve instead of the four-port version to save on plumbing?
Why is it that your valves have pilot ratios below 10:1, while other manufacturers start at 7:1 and go up?
Why can't I block the pilot vent port? That area is positively sealed, isn't it?
Should I replace the counterbalance valve if my cylinder is drifting or moving?
I have a pilot-to-open check on a large cylinder and the decompression is violent. Can I use a counterbalance instead?
How do I size a counterbalance valve?
Can I adjust a counterbalance valve in the field?
Why do you offer 2 check valve cracking pressures?
What happens to the counterbalance valve if I have backpressure in my system?
What do you mean by hysteresis when referring to a counterbalance valve?
Highlights
Technical Tips
Technical Information