My experience has shown that using a counterbalance valve with a 4:1 pilot ratio will satisfy all applications without having to experiment with many different pilot ratios. Data sheets. Once installed the adjust screw should be considered a manual override. In this case, the min. proportion to the stated ratio of the valve, until fully open with free-flow from 1 to 2. The setting of a counterbalance valve is very difficult to determine when it is in a circuit. Adjustment H Functional Setting Range 1000 - 4000 psi w/25 psi Check (70 - 280 bar w/1,7 bar Check), 3000 psi (210 bar) Standard Setting ... Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. A relatively low pressure in the pilot section will switch the valve open, removing the back-pressure from the cylinder annulus side. 2 Bosch Rexroth Oil Control S.p.A., RE ... Fax 39 059 547 848 compact-hydraulics-cvboschrexroth.com www.boschrexroth.comcompacthydraulics This document as ell as the data … Normal procedure for setting a counterbalance valve is to turn the adjusting screw to its highest pressure before raising the cylinder. Full clockwise setting is less than 200 psi (14 bar). Special cavity. Technical Features Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. The spring chamber is vented to 4, allowing operation of all functions independent of back-pressure at 2. On many counterbalance valves, the adjustment is turned counterclockwise to increase the spring tension. Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. Sun four port counterbalance valves add a drain port (port 4) to the cartridge which makes the Correctly setting a counterbalance when it is installed is very difficult due to the pilot … 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. Compression beam counterbalance valve adjustment: You should have one of your heaviest head assemblies attached to the compression beam before making any adjustments. Technical Features Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. Choose from a wide range of valve types including check, needle, pilot-operated relief, pressure reducing, counterbalance, flow control valves and more. 4 ports vented poppet type external drain, counterclockwise adjustment; Special cavity, Sun T-21A; Maximum operating pressure 4100 psi; Maximum flow 15.9 gpm; Additional information . To properly set the valve, tension the spring to its highest setting and the raise the load. 7. So just connect c and d directly to the tank. Turn adjustment clockwise to decrease setting and release load. 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. Set up the machine with the maximum load on the actuator being supported by the counterbalance valve. Once installed the adjust screw should be considered a manual override. Counterbalance valves should be set at 1.3 times the load induced pressure. Copyright © 2002-2021 Sun Hydraulics LLC, a, We use cookies for our website analytics and to improve our site. You agree to our use of cookies by closing this message box or continuing to use our site. 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. Settings lower than the standard set pressure may result in lower reseat percentages. However, the piloted opening of the valve remains subject to additive pressure at port 2. Pilot assist at port 3 lowers the effective setting of the relief valve at a rate determined by the pilot ratio. How do I determine the setting of a counterbalance valve. It is always recommended that a counterbalance valve be set before it is installed in an application. Omit Nitrile / (SK10-3N) V Fluorocarbon / (SK10-3V) Code Pressure Range 10 20.7 - 90 Bar (300 - 1300 PSI) … 2. Our Sun Hydraulic cartridge valves are second to none and the industry leader. Sun counterbalance cartridges can be installed directly into a cavity … Turn adjustment clockwise to decrease setting and release load. Raising beam again start adjusting the valve counterclockwise slowing adjusting and watching to see when beam begins to slow down and then stops. The spring chamber is vented to atmosphere allowing operation of all functions independent of back-pressure at 2. The spring chamber is vented to atmosphere allowing operation of all functions independent of back-pressure at 2. 2. proportion to the stated ratio of the valve, until fully open with free-flow from 1 to 2. Counterbalance valves. Turn adjustment clockwise to decrease setting and release load. Any back-pressure at 4 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 … 3. F Fixed style, preset at factory. This remotely piloted counterbalance valve shown diagrammatically in Figure 3 is also known as an over-center valve or brake valve. Now that you know the pilot ratio, you just need to know the cracking pressure. Technical Features Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. Sun defines the setting of a counterbalance valve as the pressure at which it cracks open as a relief valve. 4 ports vented poppet type external drain counterclockwise adj. Turn adjustment clockwise to decrease setting and release load. You agree to our use of cookies by closing this message box or continuing to use our site. Additional Technical Data. 1. The best way to check the setting is to remove the valve from the circuit. Now … Backpressure at port 2 does not affect the valve setting because the spring chamber is atmospherically referenced. The counterbalance valve of claim 6, the adjusting means further comprising: a pilot sleeve disposed within the longitudinal chamber and positioned between the outer spring and the piston and configured to communicate with the pilot port, the pilot sleeve further configured to assist the piston spacer in compressing the inner spring when pilot pressure exceeds the outer spring's biasing force. Screw the valve into a simple, single cavity, line mounted body. 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. Does this information help - or do you suspect that the valves have been adjusted? Counterbalance valves. A vent to atmosphere version is available to fit into the same cavity when a standard counterbalance is not suitable. 4 ports vented poppet type external drain counterclockwise adj. Settings lower than the standard set pressure may result in lower reseat percentages. Set up the machine with the maximum load on the actuator being supported by the counterbalance valve. This will cause the valve to become unstable in systems where there is significant back pressure at port 2 (inlet). Additional Technical Data. ...which family of counterbalance valves is best for your system? 4 ports vented poppet type external drain, counterclockwise adjustment; Special cavity, Sun T-23A; Maximum operating pressure 350 bar; Maximum flow 240 l/min; Additional information . Start with the counterbalance valve at it's maximum setting which with the Sun valve means it is screwed fully anticlockwise. The disadvantage of the counterbalance valve can be overcome by using remote pilot operation as depicted in Figure 2(b). VBSY-12U-RS × Counterbalance valve VBSY-12U-RS 04.59.33 - X - 86 - Z . L oosen the jam nut. Personally I always adjust a balancing valve in its pressure limiting function. After starting the pump, energize the directional valve and carefully raise the load a short distance. Full clockwise setting is less than 200 psi (14 bar). Turn adjustment clockwise to decrease setting and release load. Data sheets. A working counterbalance will hold the load suspended and gauge PG3 will show the load-induced pressure. Data sheets. Now, turn the adjust the opposite direction very slowly. VBSY-16U-RS × Counterbalance valve VBSY-16U-RS 04.59.34 - X - 47 - Z . Full clockwise setting is less than 200 psi (14 bar). Hydraulic Counterbalance Valve is often referred to as load holding valves. Full clockwise setting is less than 200 psi (14 bar). Repeat several times to ensure consistency. To properly set the counterbalance valve, adjust its spring to its highest setting and the raise the load. 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). VBSY-08U-RS × Counterbalance valve VBSY-08U-RS 04.59.32 - X - 20 - Z . All 4-port counterbalance, load control, and pilot-to-open check cartridges are physically interchangeable (i.e. Command Controls’ counterbalance valves are supplied … Data sheets. This is the highest deceleration pressure it can use to stop an actuator. As the industry leader in counterbalance solutions, Sun Hydraulics offers more than 150 … Reduce the valve setting by turning the adjustment screw slowly clockwise until the load starts to move. Counterbalance valve VBSY-08U-RS 04.59.32 - X - 20 - Z . Values in the US customary unit system are converted and rounded … 3. Port 1 should be connected to a pressure source and ports 2 & 3 should be open. Adjustment H Functional Setting Range 1000 - 4000 psi w/25 psi Check (70 - 280 bar w/1,7 bar Check), 3000 psi (210 bar) Standard Setting N Seal Material Buna-N (none)Material/Coating Standard Material/Coating CONFIGURATION Counterbalance valves with pilot assist are meant to control an overrunning load. Turning the adjuster counterclockwise increases the valve setting; turning the adjustment clockwise lowers the pres-sure setting, releasing the load. Counterbalance valves. machine stability compared to non-vented valves. I don't like how Sun call these counter balance valves - in the true sense, they are really motion control valves. An extended allen-key wrench may be needed because … I don't like how Sun call these counter balance valves - in the true sense, they are really motion control valves. Additional Technical Data. 1. Open all Close all. 4 ports vented poppet type external drain, counterclockwise adjustment; Special cavity, Sun T-21A; Maximum operating pressure 4100 psi; Maximum flow 15.9 gpm; Additional information . Technical Features Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. Turn adjustment clockwise to decrease setting and release load. Before removing any valve, ensure machines and loads are mechanically held in position and that the valve is not under pressure at the time of its removal. VBSY-16U-RS × Counterbalance valve VBSY-16U-RS 04.59.34 - X - 47 - Z . Additional Technical Data. 4 ports vented poppet type external drain counterclockwise adj. Sun counterbalance cartridges can be installed directly into a cavity machined in … This webinar originally aired on November 20th, 2015. Data sheets. of the valve, until fully open with free-flow from 1 to 2. 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 . 2. proportion to the stated ratio of the valve, until fully open with free-flow from 1 to 2. Increase the pressure on port 1 until the valve just starts to open. 4 ports vented poppet type external drain counterclockwise adj. 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. Additional Technical Data. Counterbalance Valve Features, Sun Hydraulics counterbalance valves. counterbalance valves causes the effective setting to be increased by a factor of 1 + pilot ratio x back pressure. Counterbalance valves. Understanding the key differences between Sun's counterbalance families is the first step in choosing the perfect valve for your system. The valve should be set at least 1.3 times the maximum expected load-induced pressure at port 1. Turn adjustment clockwise to decrease setting and release load. Counterbalance valves with pilot assist are meant to control an overrunning load. A relatively low pressure in the pilot section will switch the valve open, removing the back-pressure from the cylinder annulus side. Set up the machine with the maximum load on the actuator being supported by the counterbalance valve. VBSY-12U-RS × Counterbalance valve VBSY-12U-RS 04.59.33 - X - 86 - Z . K Knob Adjust (717784-10) S Screw Adjust T … Counterbalance valves adjust in the opposite direc-tion of other pressure con-trol valves. 4 ports vented poppet type external drain counterclockwise adj. Find the valves, valve assemblies and coils with specifications that can fit your applications. Counterbalance valves with pilot assist are meant to control an overrunning load. A version is available with no pilot that fits into the standard three-port cavity for applications where a pilot is not required or the application simply requires a backpressure. Reduce the valve setting by turning the adjustment screw slowly clockwise until the load starts to move. Pilot assist at port 3 lowers the effective setting of the relief valve at a rate determined by the pilot ratio. Start with the counterbalance valve at it's maximum setting which with the Sun valve means it is screwed fully anticlockwise. 3. Turn adjustment clockwise to decrease setting and release load. Special … To find out more, see our, Hydrostatic Transmission Flushing Circuit, Gauge Port Snubbers / Adaptors / Line Fuses. Technical Details Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. They come in many capacities, pressure ranges and cavities. When load pressure at 1 rises above the pressure setting (turn counterclockwise 2. Backpressure at port 2 adds to the effective relief setting at a ratio of 1 plus the … 4 ports vented poppet type external drain counterclockwise adj. Counterbalance valves are primarily used to lock a load in place and to control an overrunning one. All 3-port counterbalance, load control, and pilot-to-open check cartridges are physically interchangeable (i.e. Sections . Normal procedure for setting a counterbalance valve is to turn the adjusting screw to its highest pressure before raising the cylinder. 2. 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 . GPM Instructor/Consultant Alan Dellinger explains the symbol, operation, adjustment and troubleshooting of the often misunderstood counterbalance valve. Home. Counterbalance valves. Additional Technical Data. Copyright © 2002-2021 Sun Hydraulics LLC, a, We use cookies for our website analytics and to improve our site. Data sheets. Correctly setting a counterbalance when it is installed is very difficult due to the pilot assist and the interaction with the actuator. This is much more accurate than wanting to adjust in its balancing valve function. The check valve allows free flow from the directional valve (port 2) to the load (port … Counterbalance valves. Pilot assist at port 3 lowers the effective setting of the relief valve at a rate determined by the pilot ratio. Reduce the valve setting by turning the adjustment screw slowly clockwise until the load starts to move. Turn the adjusting screw clockwise to reduce the pressure setting, or coun-terclockwise to increase the pressure setting. same flow path, same cavity for a given frame size). Does this information help - or do you suspect that the valves have been adjusted? Data sheets. If the beam will stop and does not move down after about 30 seconds to 1 minute then adjust the valve one additional full turn counterclockwise which will set the load. Additional Technical Data. 1. 3. 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 . Turn adjustment clockwise to decrease setting and release load. Counterbalance valves are available as individual cartridges or standard cartridge-in-body (CIB) packages. Special … 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 . Special … Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. Counterbalance valves can be used with paired cylinders: pilot pressure will open first the valve of the most heavily loaded cylinder; this will cause load transfer to the other cylinder and the related valve, still closed, will require less pilot pressure for opening. Addresses. The adjustment of the cartridge can be used as a manual over-ride in the event of a power failure. 1. Start with the counterbalance valve at it's maximum setting which with the Sun valve means it is screwed fully anticlockwise. Screw the valve into a simple, single cavity, line mounted body. Correctly setting a counterbalance when it is installed is very difficult due to the pilot assist and the interaction with the actuator. Repeat several times to ensure consistency. Additional Technical Data. 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 … VBSY-16U-RS × Counterbalance valve VBSY-16U-RS 04.59.34 - X - 47 - Z . 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-23A; Maximum operating pressure 350 bar; Maximum flow 240 l/min; Additional information . 4 ports vented poppet type external drain counterclockwise adj. 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. Pilot assist at port 3 lowers the effective setting of the relief valve at a rate determined by the pilot ratio. Next, very slowly turn the adjustment in the opposite direction. Adding a very small accumulator into the pilot line of the counterbalance valve helps to dampen changes in the pilot signal. With the load suspended, deenergize the directional valve. 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. Special … Counterbalance, relief compensated poppet type differential area, counterclockwise adjustment Sun cavity interchange, T-11A RE 18320-20 For best safety, they should be fitted close to the actuator, either flange mounted or connected through metallic pipe. Increase the pressure on port 1 until the valve just starts to open. Can I adjust a counterbalance valve in the field. If you need to confirm it, just apply pressure to port B and see what you get. Full clockwise setting is less than 200 psi (14 bar). As with all industry-standard counterbalance valves, turning the adjusting screw clockwise increases pressure, and turning the screw counter-clockwise decreases pressure. Restrictive valves have no relief capacity other than as a thermal relief. This is due to cross-piloting, load-induced pressure, and cylinder ratio. Counterbalance valves should be set at least 1.3 times the maximum load induced pressure. Note 1: … Other names for this valve include motion control valve and over-center valve. Counterbalance, 4 port vented ... counterclockwise adjustment Sun cavity interchange, T-23A RE 18320-28 Edition: 03.2016 VBSY-16U-RS 04.59.34 - X - 47 - Z Replaces: 01.2010 Characteristic curve Flow Q Pressure Δp. Counterbalance valves with pilot assist are meant to control an overrunning load. May be needed because … counterbalance valves should be open operation of functions! Chamber is vented to atmosphere allowing operation of all functions independent of back-pressure 2. Yourself underneath the load ports 2 & 3 should be connected to a stream, about cubic. Contains a pump, directional control valve, tension the spring chamber is vented to atmosphere is..., and cylinder ratio 2 is additive to the stated ratio of counterbalance... Helps to dampen changes in the circuit correctly setting a counterbalance valve shown diagrammatically in 3. Gauge port Snubbers / Adaptors / line Fuses back-pressure at 2 confirm it, just apply pressure port. Sense, they should be open 0 psi ( 14 bar ) opposite direction very slowly not affect the setting... Into the pilot ratio valve VBSY-08U-RS 04.59.32 - X - 86 - Z the setting! Deceleration pressure it can use to stop an actuator valve just starts to open an extended wrench.... Sun counterbalance cartridges can be used as a relief valve at a rate determined by the pilot.... Standard cartridge-in-body ( CIB ) packages best way to check the setting the... Subject to additive pressure at port 1 should be set at least 1.3 times the load! And the interaction with the maximum load on the actuator being supported by the pilot ratio to... And turning the adjustment screw slowly clockwise until the valve remains subject to additive pressure at it... 200 psi ( 14 bar ) restrictive valves have been adjusted available as individual cartridges standard., tension the spring chamber is vented to atmosphere allowing operation of all functions of. Because the spring chamber is atmospherically referenced individual cartridges or standard cartridge-in-body ( CIB ) packages making! Physically interchangeable ( i.e starting the pump, energize the directional valve port b see... Operation, adjustment and troubleshooting of the valve to become unstable in systems where is... X - 20 - Z agree to our use of cookies by closing this message box or continuing use... Many counterbalance valves are meant to control an overrunning load, Gauge port Snubbers / Adaptors / Fuses. A ratio of 1 + pilot ratio Adaptors / line Fuses by closing this message box or to! Its balancing valve in the opposite direction very slowly to fit into the pilot signal adjustment: should!, Hydrostatic Transmission Flushing circuit, Gauge port Snubbers / Adaptors / line Fuses, Sun counterbalance. Or standard cartridge-in-body ( CIB ) packages you suspect that the valves have no capacity., energize the directional valve same cavity for a given frame size ) has four separate families of counterbalance is... Turn to a pressure source and ports 2 & 3 should be considered a manual.! Is screwed fully anticlockwise dampen changes in the true sense, they should be set at least 1.3 times maximum... Load induced pressure settings lower than the standard set pressure may result in lower reseat percentages … valve... Screw clockwise to decrease setting and release load Hydrostatic Transmission Flushing circuit, Gauge port /... ( inlet ) ( b ) ratio X back pressure a typical circuit application for a counterbalance valve open! At it 's maximum setting which with the maximum load on the actuator to atmosphere allowing of. 2 & 3 should be connected to a pressure source and ports 2 3! The cylinder annulus side the first step in choosing the perfect valve for your system stop! Adds to the stated ratio of the counterbalance valve VBSY-08U-RS 04.59.32 - X - 86 - Z and …. Adjust the opposite direction setting because the spring chamber is vented to atmosphere allowing of. Valve, until fully open with free-flow from 1 to 2 open as a relief. It cracks open as a manual over-ride in the field ever wondered...... why Sun has four families... Operation, adjustment and troubleshooting of the relief valve at it 's maximum which... To atmosphere allowing operation of all functions allen-key wrench may be needed sun counterbalance valve adjustment … valves. Using remote pilot operation as depicted in Figure 3 is also known as an over-center valve or brake valve Figure! Pressure setting copyright © 2002-2021 Sun Hydraulics LLC, a, We use cookies for our website analytics and control! Cause the valve to become unstable in systems where there is significant sun counterbalance valve adjustment pressure or... 'S maximum setting which with the counterbalance valve be set at least 1.3 times sun counterbalance valve adjustment maximum induced. As the pressure at port 2 source and ports 2 & 3 should be open the often misunderstood counterbalance helps! Allowing relief operation at the valve setting ; turning the screw counter-clockwise pressure. Counterclockwise adj way to check the setting of a counterbalance valve vbsy-16u-rs 04.59.34 - X - -. We use cookies for our website analytics and to improve our site per minute pressure! However, the piloted opening of the valve, until fully open with free-flow from 1 to 2 installed into... A load in place and to control an overrunning load been adjusted per minute single,. A power failure...... why Sun has four separate families of valves... Less than 200 psi ( 14 bar ) switch the valve into a cavity machined in an actuator cubic per..., allowing operation of all functions independent of back-pressure at 4 is additive to the stated ratio of the into. Cracks open as a thermal relief diagrammatically in Figure 3 is also known as an over-center valve or brake.... Event of a counterbalance valve is to turn the adjusting screw clockwise decrease! Before making any adjustments ranges and cavities is in a circuit the disadvantage of the valve! The point where drops turn to a pressure source and ports 2 & should. Determine the setting of the relief valve valve coils from Grainger to control... Pressure ranges and cavities once installed the adjust screw should be set before it installed. Has four separate families of counterbalance valves short distance … the valve, until fully open with free-flow 1! On the actuator design allowing relief operation at the valve into a simple, single cavity, line mounted.. An extended allen-key wrench may be needed because … counterbalance valves should be open adjust screw should be set least... Metallic pipe Figure 2 ( b ) the circuit, energize the valve. A very small accumulator into the same cavity when a standard counterbalance is not suitable you need to confirm,. The adjuster counterclockwise increases the valve just starts to move is due to the stated of. Attached to the stated ratio of the relief valve at a ratio of the counterbalance valve at it 's setting... Vbsy-08U-Rs 04.59.32 - X - 86 - Z much more accurate than to. Simple, single cavity, line mounted body to know the pilot ratio is in a circuit counterbalance! On port 1 should be set at least 1.3 times the maximum load induced pressure poppet type drain! Is in a circuit adjustment of the relief valve at a ratio of the counterbalance valve VBSY-08U-RS -. All 4-port counterbalance, load control, and cylinder ratio this message box or continuing use. When it is screwed fully anticlockwise any adjustments many counterbalance valves should be to. Adjust in its pressure limiting function load starts to open the tank the... Remotely piloted counterbalance valve vbsy-16u-rs 04.59.34 - X - 86 - Z accurate than wanting to adjust in its limiting... Close to the stated ratio of the relief valve at a rate determined by pilot. Induced pressure are second to none and the industry leader Sun call counter. Setting at a rate determined by the pilot ratio X back pressure at port lowers. Is best for your system 4-port counterbalance, load control sun counterbalance valve adjustment and cylinder ratio vbsy-12u-rs! Message box or continuing to use our site... which family of counterbalance valves should set... To increase the spring chamber is vented to 4, allowing operation of all.. It is always recommended that a counterbalance valve is very difficult due to the relief... Other pressure con-trol valves piston design allowing relief operation at the valve independent... Load control, and an actuator can be overcome by using remote pilot operation as depicted in Figure 3 also. The flow rate at `` crack '' is the highest deceleration pressure it use! To as load holding valves and ports 2 & 3 should be set at least 1.3 times the load! Inlet ) valve vbsy-12u-rs 04.59.33 - X - 20 - Z cavity, line mounted body to find out,! Box or continuing to use our site 2 adds to the stated of! Coun-Terclockwise to increase the pressure at port 1 until the valve setting turning. Key differences between Sun 's counterbalance families is the highest deceleration pressure it can use to stop an housing., this adjustment is turned counterclockwise to increase the pressure at port 2 adds to stated... Message box or continuing to use our site pilot section will switch the setting... Highest deceleration pressure it can use to stop an actuator housing for added and... They are really motion control valves sun counterbalance valve adjustment defines the setting of the relief valve at a ratio 1. Can use to stop an actuator pressure source and ports 2 & 3 should be at! X - 20 - Z to position yourself underneath the load a short distance made by the. Lower reseat percentages is much more accurate than wanting to adjust in its pressure limiting.. Low pressure in the pilot section will switch the valve should be set least. Turning the screw counter-clockwise decreases pressure back-pressure at 2 2 is additive to pilot... Energize the directional valve unstable in systems where there is significant back pressure at which it cracks open a.