1 … The counter balance valve serves several functions. The relief valve opens when the combined force created by the pilot pressure and the load-induced pressure The extend side of the lower boom cylinder is equipped with a 10 gpm counterbalance valve. 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. The counterbalance valve shown has an integral check valve. A counterbalance valve can easily be described as a pilot operated relief valve with a free flow check. When it is counterbalancing the back pressure at T should be kept to a minimum. As with the sequence and pressure-reducing valves, a check valve is built in to allow free flow in the reverse direction. Pilot assist at port 3 lowers the effective setting of the relief valve … 3.26). integral-mounted counter-balance valves to prevent sudden cylinder collapse in case of hose or other hydraulic failure. When there is no pressure applied to the full piston side of a cylinder (figure 1), the valve will maintain oil in the rod side. CBV1-CBV18 Counterbalance Valves ORF3 Orifice -- Traction Manifold .052 CR1-CR2 Cross-Port Relief Valve ORF4 Orifice -- Traction Manifold .040 CV1 Check Valve, P1 ORF5 Orifice -- Traction Manifold .090 CV2 Check Valve -- Load Sense ORF6 Orifice -- Generator Option .030 In the hydraulic diagram the counterbalance valve is used to get a … While counterbalance valves maintain a healthy amount of back pressure, they force the pump to develop the full set pressure on the counterbalance spring before they allow the actuator to move. The counterbalance valve is applied as a brake valve on relatively small installations, for example a crane system on a truck, in order to get a positive control on a hydraulic cylinder or motor with a negative load. A single square is used for every simplified pressure valve I can think of; relief valves, pressure reducing valves, counterbalance valves, sequence valves etc. The single difference is that the brake valve has a remote pilot line in addition to an upstream pilot line. Every pressure valve, with the exception of the reducing valve, is what we call normally closed, which does … This valve can also be used with hydraulic motors and is then commonly referred to as a “brake valve”. Americas. The counterbalance valve then shifts to correct itself and can cause a negative kerfuffle (at which point the diagram above should be referred to). Close. First, it is a holding valve. During lowering of the weight or extension of cylinder, hydraulic oil leaving the cylinder will enter to the primary port of counterbalance valve i.e. The counterbalance valve is used with suspended and overrunning type loads. 20 Parts Viewing 10 of 20 Show More . Counterbalance valves with pilot assist are meant to control an overrunning load. The relief valve within the counterbalance valve provides the critical function of controlling the flow from the cylinder. The proven counterbalance valve series ZNS in size NG06 (CETOP 03) and NG10 (CETOP 05) enables a reliable operation by controlling the actuator movement at overrunning loads. The result of hysteresis is a cursing, some anxiety, bounce, loud chatter, or high-pitch noise. A separate drain connection from the spring chamber is unnecessary because the pressure section of the valve is inoperative when the T port is pressurized (flow is through the check valve). Counterbalance valve is attached here between rod end port of cylinder and directional control valve. Phone. USA, Canada, Mexico. The counterbalance valve and brake valve have similar symbols (Fig. c-parker@parker.com. Hydraulic motors and is then commonly referred to as a pilot operated relief valve a... 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