Counterbalance valves

A counterbalance valve with a brake release port is a specialized load-holding valve used in hydraulic systems to ensure controlled and safe lowering of loads. It precisely regulates oil flow to prevent uncontrolled descent. The integrated brake release port is used to hydraulically release a connected spring-applied brake. The load can only be lowered when sufficient hydraulic pilot pressure is present to both open the valve and release the brake.

The dual safety function is achieved through the interaction of the counterbalance valve and the mechanical brake. The valve blocks the oil flow as long as there is insufficient pilot pressure. At the same time, the mechanical brake holds the load. Only when pilot pressure is applied will the brake be hydraulically released and the counterbalance valve allow movement. In the event of a malfunction or loss of pressure, both the valve and the brake remain closed, securely holding the load and preventing uncontrolled lowering.

These valves are ideal for hydraulic motors and cylinders equipped with holding or spring-applied brakes, as typically found in winches, cranes, and aerial work platforms. They are used whenever loads must be held and only lowered by a deliberate control signal, particularly with suspended or hanging loads. Machines that require both hydraulic and mechanical safeguards to prevent uncontrolled descent also benefit from this type of valve.

• Single-acting or double-acting
• Often flange-mountable
• Maximum flow rate: up to 60 l/min (single-acting) or 100 l/min (double-acting)
• Adjustment range: 60–250 bar
• Pilot ratio
• Common port sizes: G 1/2" or G 3/4" BSPP
• Dedicated port for hydraulic brake release

• Dual safety: valve and mechanical brake lock in case of pressure loss
• Controlled lowering only with correct pilot pressure
• Prevention of uncontrolled descent
• Low-wear, leak-free valve technology
• Increased system lifespan and reduced maintenance

Correct setting of the closing pressure is crucial. A common setting is 1.3 times the maximum load pressure. Installation should be as close as possible to the hydraulic motor or cylinder to avoid hose rupture between the valve and the load. Adjustment and commissioning must only be carried out by trained personnel.

Yes, there are different designs. They are often flange-mountable for hydraulic motors such as MP/MR/MH. There are double-acting versions that hold in both directions, as well as valve combinations with an integrated brake release port.

They are crucial safety components because, in combination with spring-applied brakes or other mechanical safety devices, they ensure controlled lowering and secure holding of loads. The dual safety function prevents a load from descending uncontrollably in the event of a pressure loss or malfunction. Correct selection, adjustment, and installation are essential for full functionality and operational safety of the system.