Effect of upstream throttle valve on static and dynamic characteristics of counterbalance valve

Document Type : Original Article

Authors

Egyptian Armed Forces.

Abstract

Abstract:
For negative loads, the counterbalance valve is responsible for building up the necessary back pressure to carry the load, in addition to the braking action to prevent the load from being freely fall. Here, we argue that the introducing of a throttle valve connected upstream to the counterbalance valve has an effect on its dynamic characteristics (response) and braking characteristics, leading to enhancement in the circuit performance. Theoretical and experimental investigations have been carried out for different setting of throttle valve and for different cracking pressures of the counterbalance valve. The results showed that the introduction of the throttle valve connected upstream has an effect on the static characteristics of the counterbalance valve. While the dynamic characteristics (response time) of the counterbalance valve is enhanced by introducing the throttle valve and is mainly controlled by the throttle valve setting as well as the cracking pressure. The response time of the counterbalance valve could be increased by decreasing the throttle valve setting which is suitable for light loads and vice versa. This enhancement reduces the load shocks at starting as well as improves the braking effect of the freely falls load.

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