The performance of hydraulic system employing counterbalance valves frequently encounter problem due to oscillation which are primarily due to the load inertia, volume of pressure system, response of the counterbalance valve and the flow at which the valve is required to regulate the load. It is the P P = (T S – L) / R P P P = Pilot Pressure T S = Thermal Setting L = Induced Load R P = Pilot Ratio Example: The maximum load is 3000 psi. External Control Counterbalance Valve Report by Material, Application, and Geography – Global Forecast to 2022 is a professional and in-depth research report on the world's major regional market conditions, focusing on the main regions (North America, Europe and Asia-Pacific) and the main countries (United States, Germany, united Kingdom, Japan, South Korea and China). 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. Counterbalance valve application. finalizing a counterbalance valve for your application. Purpose of CounterBalance ( back-pressure) Valve (CBV) To keep a vertically mounted hydraulic cylinder in the upward position while the pump is idling. Counterbalance valves. Sun offer a large range of different types of counterbalance valves to try and satisfy the wide range of application problems. Holding Setting – The holding setting is sometimes referred to as the counterbalance setting. Therefore, the vast majority of counterbalance applications are satisfied with a 3:1 pilot ratio. This is due to the counterbalance valve opening and closing as the pressure on the cap side of the cylinder goes up and down. Counterbalance valve is attached here between rod end port of cylinder and directional control valve. The counterbalance valves allows free flow from port B to port L through the check valve, but blocks the flow in the opposite direction unless pressure is applied to port P. When sufficient pressure is applied, a variable orifice opens. Application Tips which include instructions on how to set a counterbalance valve in a working system, when necessary; Pressure Setting vs. -The vertical cylinder from descending due to the weight of its load. The counterbalance valve working principle states that the fluid will be trapped inside the spool under pressure until the pilot pressure overcomes the pre-set value. CB - Counterbalance Valves Application Notes A typical circuit application for a counterbalance valve contains a pump, directional control valve, and an actuator. The counterbalance valve is set to open at a pressure slightly above the pressure required to hold the piston up. A common example is a cherry picker, where the load is often a person. A tale of two architectures. The valve body is available with different port sizes and thread types. Figure shows the operation of a typical counterbalance valve. Basic counterbalance application Standard Counterbalance Valve (Eaton 1CE) For most applications. There are two main types of counterbalance valves, known as direct-acting and differential area. These valves will reduce the power consumption, improve the life span of pumps and decrease the fluid temperature. Flow Saturation Characteristic of Counterbalance Valve and Application Author(s): ZHU Wenfeng , JIAO Shengjie , YANG Yaoxiang , DING Feng Pages: 205 - 212 Some actuators with running-away (or overrunning) loads will let the load free fall when the directional valve that controls the actuator shifts to lower the load. For best safety, they should be fitted close to the actuator, either flange mounted or connected through metallic pipe. October 21, 2014 by hydpneu. The Counterbalance Valve block is essentially a data-sheet-based model. Advanced Search >. The two-stage valve has overcome many instability problems by preventing the total decay of the stored energy in the cylinder and stopping the valve overreacting. These valves are suitable for use with static or dynamic loads when trying to stop a load from drifting or running away. Understanding the pilot ratio of the counterbalance valves; Calculations the pilot pressure of the counterbalance valves for different applications ~~~ // ~~~ Lower pilot ratios will increase system stability and provide better motion control. Counterbalance valves are available as individual cartridges or standard cartridge-in-body (CIB) packages. A counterbalance valve for use in drive oil hydraulic circuitry of an oil hydraulic motor is constructed so that an oil hydraulic motor can slow down without shock, while cavitation is prevented, thus coming to rest in a short period time. The diagram above shows the internal construction of counterbalance valves. 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