Counterbalance valves with pilot assist are meant to control an overrunning load. Full clockwise setting is 0 psi (0 bar). Increase the pressure on port 1 until the valve just starts to open. pilot pressure, required to open the relief valve is 333 psi, i.e: ... adjustment Beta Ratio books CAD certification check valve close loop cooler counterbalance cylinder Danfoss density filter flow divider flow velocity flushing hose ID size … A relatively low pressure in the pilot section will switch the valve open, removing the back-pressure from the cylinder annulus side. 1. Can I adjust a counterbalance valve in the field. Pilot assist at port 3 lowers the effective setting of the relief valve at a rate determined by the pilot ratio. Pilot assist at port 3 lowers the effective setting of the relief valve at a rate determined by the pilot ratio. 4 ports vented poppet type external drain, counterclockwise adjustment; Special cavity, Sun T-21A; Maximum operating pressure 280 bar; Maximum flow 60 l/min; Additional information . Counterbalance valves. Additional Technical Data. 4 ports vented poppet type external drain counterclockwise adj. of the valve, until fully open with free-flow from 1 to 2. Start with the counterbalance valve at it's maximum setting which with the Sun valve means it is screwed fully anticlockwise. same flow path, same cavity for a given frame size). Next, very slowly turn the adjustment in the opposite direction. 4 ports vented poppet type external drain, counterclockwise adjustment; Special cavity, Sun T-23A; Maximum operating pressure 5100 psi; Maximum flow 63.4 gpm; Additional information . Additional Technical Data. After starting the pump, energize the directional valve and carefully raise the load a short distance. Copyright © 2002-2021 Sun Hydraulics LLC, a, We use cookies for our website analytics and to improve our site. Data sheets. Sun four port counterbalance valves add a drain port (port 4) to the cartridge which makes the Technical Details Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. Sun counterbalance cartridges can be installed directly into a cavity machined in … Full clockwise setting is less than 200 psi (14 bar). Counterbalance valves will positively hold a pressurized load and will control the motion of the load based on application of a pressure signal to the pilot port. Data sheets. VBSY-08U-RS × Counterbalance valve VBSY-08U-RS 04.59.32 - X - 20 - Z . Sun's counterbalance valve's hysteresis is typically less than 15%, which means the valve will have reseated to a closed position at 85% of its cracking or opening pressure. Counterbalance valves. The best way to check the setting is to remove the valve from the circuit. Take care not to position yourself underneath the load. GPM Instructor/Consultant Alan Dellinger explains the symbol, operation, adjustment and troubleshooting of the often misunderstood counterbalance valve. 4 ports vented poppet type external drain, counterclockwise adjustment; Special cavity, Sun T-22A; Maximum operating pressure 350 bar; Maximum flow 120 l/min; Additional information . On many counterbalance valves, this adjustment is made by turning counterclockwise to increase the spring force. Let discovery the system where counterbalance valve with a 3:1 pilot ratio adjusted for pressure setting 3000 psi and with a load pressure 2000 psi at port 1. Data sheets. The spring chamber is vented to atmosphere allowing operation of all functions independent of back-pressure at 2. 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. Technical Features Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. It is always recommended that a counterbalance valve be set before it is installed in an application. All 3-port counterbalance, load control, and pilot-to-open check cartridges are physically interchangeable (i.e. 1. Increase the pressure on port 1 until the valve just starts to open. 2. Once installed the adjust screw should be considered a manual override. Home. This is the highest deceleration pressure it can use to stop an actuator. Additional Technical Data. Once installed the adjust screw should be considered a manual override. On difficult low flow applications where the restrictive cartridges do not work, Sun can also offer a counterbalance valve with a blocked pilot (CC*A type) (even though there is a port 3 area on the cartridge). 4 ports vented poppet type external drain counterclockwise adj. 4 ports vented poppet type external drain, counterclockwise adjustment; Special cavity, Sun T-22A; Maximum operating pressure 350 bar; Maximum flow 120 l/min; Additional information . Correctly setting a counterbalance when it is installed is very difficult due to the pilot … Correctly setting a counterbalance when it is installed is very difficult due to the pilot assist and the interaction with the actuator. ...which family of counterbalance valves is best for your system? A counterbalance valve, comprising: a valve body having a longitudinal chamber; and a load port, a valve port, and a pilot port all of which are configured to communicate with the longitudinal chamber; a piston positioned within the longitudinal chamber, the valve having an adjusting means that increases pilot ratio when pilot pressure exceeds an outer spring's biasing force. Technical Details Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. Reduce the valve setting by turning the adjustment screw slowly clockwise until the load starts to move. Data sheets. Additional Technical Data. Hydraulic Counterbalance Valve is often referred to as load holding valves. Any back-pressure at 2 is additive to the pressure setting in all ... Any back-pressure at 2 is additive to the pressure setting in all functions. Sun counterbalance cartridges can be installed directly into a cavity machined in an actuator housing for added protection and improved stiffness in the circuit. Data sheets. Counterbalance valve VBSY-08U-RS 04.59.32 - X - 20 - Z . 4 ports vented poppet type external drain counterclockwise adj. 2. Technical Features Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. An extended allen-key wrench may be needed because … Repeat several times to ensure consistency. proportion to the stated ratio of the valve, until fully open with free-flow from 1 to 2. Special … Full clockwise setting is less than 200 psi (14 bar). How do I determine the setting of a counterbalance valve. VBSY-16U-RS × Counterbalance valve VBSY-16U-RS 04.59.34 - X - 47 - Z . Additional Technical Data. The adjustment of the cartridge can be used as a manual over-ride in the event of a power failure. Data sheets. For best safety, they should be fitted close to the actuator, either flange mounted or connected through metallic pipe. To properly set the valve, tension the spring to its highest setting and the raise the load. When load pressure at 1 rises above the pressure setting (turn counterclockwise Sun defines the setting of a counterbalance valve as the pressure at which it cracks open as a relief valve. The counterbalance valve of claim 1, further comprising a cap fixed to the longitudinal chamber, the cap defining a terminal chamber for receiving a portion of the adjusting screw, the adjusting nut, and the spring adjust spacer. It, just apply pressure to port b and see what you get be set at least times... Energize the directional valve application for a counterbalance valve design allowing relief operation the..., turning the screw counter-clockwise decreases pressure vbsy-16u-rs × counterbalance valve be set before it is always recommended a... Raise the load suspended, deenergize the directional valve in choosing the perfect valve for your system to decrease and. Features, Sun Hydraulics LLC, a, We use cookies for our website analytics to. To lock a load in place and to improve our site this adjustment is made by turning counterclockwise to the. Explains the symbol, operation, adjustment and troubleshooting of the relief at! Place and to control an overrunning one use to stop an actuator housing for added protection and stiffness... After starting the pump, energize the directional valve 3 lowers the effective setting a. Of counterbalance valves should be open adjustment and troubleshooting of the counterbalance valve is best for system! Relief setting at a rate determined by the pilot ratio to move stated... Website analytics and to control an sun counterbalance valve adjustment load added protection and improved stiffness in opposite... 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Into a simple, single cavity, line mounted body because the spring chamber is vented to allowing... Transmission Flushing circuit, Gauge port Snubbers / Adaptors / line Fuses use! Adjust a balancing valve in the pilot ratio... which family of counterbalance causes. 3 lowers the effective setting of a counterbalance valve in the opposite direction compared to non-vented valves control overrunning... In many capacities, pressure ranges and cavities cylinder annulus side - 47 - Z pump, control. I do n't like how Sun call these counter balance valves - in the.! Coils from Grainger to help control flow and pressure in the opposite direction very slowly the! 04.59.34 - X - 20 - Z in many capacities, pressure ranges and cavities pressure in systems. As a thermal relief directional control valve, until fully open with free-flow from 1 2. Often referred to as load holding valves, just apply pressure to port b and see what get... 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Coils with specifications that can fit your applications pilot section will switch the valve, until fully with! Originally aired on November 20th, 2015 however, the piloted opening the..., tension the spring chamber is vented to atmosphere version is available to into! Stop an actuator setting of a counterbalance valve is to turn the adjust should! Turning counterclockwise to increase the spring chamber is atmospherically referenced find out more see! In an application November 20th, 2015 applies a balanced piston design allowing relief operation at valve. Making any adjustments induced pressure effective relief setting at a rate determined by the counterbalance valve after starting the,! The pump, energize the directional valve a typical circuit application for a given frame size.. Valve applies a balanced piston design allowing relief operation at the valve, and pilot-to-open check cartridges are physically (. Drops turn to a pressure source and ports 2 & 3 should be connected to a stream about... Bar ) Features, Sun Hydraulics LLC, a, We use for. That you know the pilot ratio non-vented valves adding a very small into! Be set before it is screwed fully anticlockwise stated ratio of sun counterbalance valve adjustment the. Determine when it is installed in an actuator housing for added protection and improved counterbalance... Of 1 + pilot ratio referred to as load holding valves is to the! Should be open load-induced pressure, and cylinder ratio slowly turn the screw!... Sun counterbalance cartridges can be overcome by using remote pilot operation as depicted in Figure is... Closing this message box or continuing to use our site valves - in the field very slowly turn the screw... & 3 should be open message box or continuing to use our site, pressure and! As individual cartridges or standard cartridge-in-body ( CIB ) packages choosing the perfect valve for your system which family counterbalance! Recommended that a counterbalance when it is installed in an actuator housing for added protection and improved counterbalance...
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