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Cylinder mount counter balance valves

CB Cyl Mt
In stock
Product Details

Cylinder mount Counter Balance valves
Counterbalance valves are used in hydraulic systems working with overriding (running away) or suspended loads. They are designed to create back pressure at the return line of the actuator to prevent losing control over the load

Please note cylinder, pipe & fittings in photo is not included, it is simply an fitment illustration.
These are compact designs made especially for cylinder mounting. These use either a 3/4" uno or larger 1.1/16: You then need to pipe up to the other port (steel pipe by law) to achieve back pressure. These are available in single counterbalance, ie, the load is controlled only in one direction, or Dual counterbalance where the load is controlled from falling in both directions. These feature high quality Keta Cartridges. Please see the photo for the correct installation diagrams. The A & B ports are 3/4" Uno or 1.1/16" & the 'pipe' port is also 3/4" or 1.1/16"Uno. (single cavity body), load is held on port C2.

Please note; standard range cartridges will be sent unless you call/message for alternate range. Standard is LCBCA-LHN ; 3:1 ratio, 1.7Bar crack, & 70-280 Bar pressure range (1000psi -4200psi) Optional same price but contact us is 3:1, .3Bar crack 70-280bar adjustable

Two check valve cracking pressures are available. Use the 1.7 bar check unless actuator cavitation is a concern. Generally, the 1.7 bar check spring is recommended for most applications as it is more robust and insensitive to rapid flow reversals. The 0.3 bar check spring should be used if there is a need to pull in make-up oil. • Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. Max pressure for the body is 210Bar

Please note; On the single cavity body, load is held on port C2.

Counterbalance valves are used with cylinders to safely hold suspended loads and deal with over-running loads. Both counterbalance valves and pilot-operated check valves can be used to lock fluid in a cylinder to prevent drifting. However, a pilot-operated check valve cannot control an over-running load. Whenever uncontrolled movement can occur from an overrunning load, a counterbalance valve should be used.
Pressurizing the line leading to the cylinder’s cap-end port also applies pilot pressure to the counterbalance valve. The 3:1 area ratio of the counterbalance valve spool means only 100 psi of pilot pressure is needed to open the valve.

Setup and Troubleshooting
To properly set the counterbalance valve, adjust its spring to its highest setting and the raise the load. On this & many counterbalance valves, this adjustment is made by turning counterclockwise to increase the spring force. Next, very slowly turn the adjustment in the opposite direction. Caution: For safety, make absolutely sure nothing of value (especially yourself) is underneath the load. Once the load starts to drift down very slowly, turn the adjustment back in the opposite (original) direction until the drifting stops. Turn the adjustment a quarter of a turn in the same direction and then tighten the lock nut.

When a counterbalance valve fails, it usually sticks in the open condition. This results in the load slowly drifting downward. When this occurs, service people often assume the drifting because is caused by cylinder’s piston seals leaking. As a result, they change out or repair the cylinder, which does not solve the problem. It’s usually quicker, easier, and less expensive to check the counterbalance valve.

Contamination can cause the internal check valve or spool to stick open. Before removing the valve, exercise caution and lower the load to the ground. Equally important, be certain that pressure in the hydraulic lines has been bled down to 0 psig. After positively confirming this, remove the valve and inspect for broken springs, trash, etc. Don’t forget to inspect the internal check valve.

Phone: 07 5563 1982
Hours: 8 am to 4 pm Monday - Friday, excluding public holidays
If you have any questions please don’t hesitate to contact us
Best regards,
Improper Selection
, Installation, Implementation, And/Or Operation By Anyone Other Than Persons With Appropriate Technical And Mechanical Training Can Result In Damage To Equipment Or Property, Serious Personal Injury, Or Death. Proper Precautions And Safety Procedures Should Be Implemented Prior To The Installation And Operation Of Equipment.

RL 21.07.23

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