Hydraulics and Pneumatics: Unit III: Hydraulic Circuits and Systems
hydraulic circuit using counterbalance valve
Hydraulic Circuits and Systems - Hydraulics and Pneumatics
A counterbalance valve, also known as a back-pressure valve, is applied to create a back pressure or cushioning pressure on the underside of a vertically moving piston to prevent the suspended load from free falling because of gravity while it is still being lowered.
HYDRAULIC CIRCUIT USING COUNTERBALANCE VALVE (COUNTERBALANCE VALVE APPLICATION) A counterbalance valve, also known as a back-pressure valve, is applied to create a back pressure or cushioning pressure on the underside of a vertically moving piston to prevent the suspended load from free falling because of gravity while it is still being lowered. Fig. 8.9 depicts a hydraulic circuit using a counterbalance valve. Extension (Lowering): The pressure setting on the counter balance is set slightly higher than the pressure required to prevent the load from free falling. Due to this back pressure, the fluid available on the rod side of the piston opens the counter balance valve; and raises the spring-opposed spool, thus the extension stroke starts. The fluid coming out of the cylinder flows directly to the tank through the DC valve. Retraction (Lifting): As the valve is normally closed, flow in the reverse direction cannot occur without a reverse free-flow check valve. When the load is raised again, the internal check valve opens to permit flow for the retraction of the cylinder. Cylinder locking: At the centre position of the DC valve, pump is unloaded to the tank while the piston is held locked by the counterbalance valve preventing the flow to the tank. If the load is required to be held for a prolonged time, then a pilot-operated check valve has to be used in addition to the counterbalance valve.1. Functional and Operational Requirements
2. Circuit
3. Operation
Hydraulics and Pneumatics: Unit III: Hydraulic Circuits and Systems : Tag: : Hydraulic Circuits and Systems - Hydraulics and Pneumatics - hydraulic circuit using counterbalance valve
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Hydraulics and Pneumatics
ME3492 4th semester Mechanical Dept | 2021 Regulation | 4th Semester Mechanical Dept 2021 Regulation