Comatrol - Model CP448-1 - Counterbalance Valve
This 3-ported, externally piloted counterbalance valve is 8-size, cartridge style, low leakage with hydraulic vent. The check section allows free flow from the directional valve (port 2) to the load (port 1), while normally blocking flow from port 1 to port 2. Reverse flow is blocked until pilot pressure is applied at port 3. When the load pressure at port 1 rises above the pressure setting, the relief valve is activated and pressure is relieved from port 1 to port 2.
Single counterbalance valves are normally used when the load is unidirectional, such as aerial lifts, cranes, or winches. In load holding applications, they can be used as hose-break valves when installed close to or in an actuator. Dual valves can be used for controlling loads bi-directionally in motor applications, or for cylinders going over center.
- Rated Pressure : 350 bar [5075 psi]
- Rated flow at 22 bar [319 psi] : 20 l/min [5 US gal/min]
- Leakage : 10 drops/min @
- 70% crack pressure
- Weight : 0.16 kg [0.36 lb]
- Pilot Ratio : 3:1, 4.5:1, 8:1
- Cavity : CP08-3L