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. They are available in four-port (MW**) vented versions. 1.6) 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. Piloting the counter balance valve from the cap side of the cylinder often results in chattering in the motion of the cylinder while it is extending. the most cost effective solution is to use the basic load holding valve such as the Eaton 1CE series. The diagram above shows the internal construction of counterbalance valves. There are two main types of counterbalance valves, known as direct-acting and differential area. CB - Counterbalance Valves Application Notes A typical circuit application for a counterbalance valve contains a pump, directional control valve, and an actuator. A common example is a cherry picker, where the load is often a person. Counterbalance valve application. Flow Saturation Characteristic of Counterbalance Valve and Application Author(s): ZHU Wenfeng , JIAO Shengjie , YANG Yaoxiang , DING Feng Pages: 205 - 212 A spool (26) is retained by springs in a neutral position. These valves will reduce the power consumption, improve the life span of pumps and decrease the fluid temperature. For best safety, they should be fitted close to the actuator, either flange mounted or connected through metallic pipe. -This permits the cylinder … 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. the company says. 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. Basic counterbalance application Standard counterbalance valve (Eaton 1CE) For most applications, the most cost effective solution is to use a basic load holding valve, such as the Eaton 1CE series. -The counterbalance valve (CBV) is set to open at somewhat above the pressure required to prevent . Counterbalance Valve Application. A common example is a cherry picker, where the load is often a person. 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. Indeed, they enable a jerk-free movement on the part of consumers in the presence of over-centre loads. Catalog HY15-3502/US Counterbalance Valve Series CB101 Parker Hannifin Corporation Hydraulic Cartridge Systems Check Valves Shuttle Valves Load/Motor Controls Flow Controls Pressure Controls Logic Elements Directional Controls Manual Valves Solenoid Valves Proportional Valves Coils & Electronics Bodies & Cavities Technical Data SH CV LM FC PC LE DC MV SV PV CE BC TD … Therefore, the vast majority of counterbalance applications are satisfied with a 3:1 pilot ratio. Operation of a counterbalance valve This permits the cylinder to be forced downward, when pressure is applied on the top. We hope the addition of this information to our website will help all of our customers with the selection, application, and possible trouble shooting of our load holding cartridges. 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 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. 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. Pressure adjustment from 1000 to 5000 PSI. 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