Note that our standard counterbalance valves are non-vented. Hydrostatic Transmission Valve Packages. Counterbalance valves play an integral role in the important task of safely controlling an actuator which may be holding a load or a person in the air. Sun four-port counterbalance valves (CW**) add a drain port (port 4) to allow for a connection downstream of restriction. Single Counterbalance Valve 3/8" In Line - 100-350Bar. This webinar video explains Sun's counterbalance families and how to choose. Generate PDF LoadHolding Selector. The valve should be set at least 1.3 times the maximum expected load-induced pressure at port 1. Hydra Part. The valve setting dynamically self-adjusts in response to load pressure, while still providing a fixed thermal relief setting. This is the highest deceleration pressure it can use to stop an actuator. depend on Sun Hydraulics to make our machines safer and more efficient. Sun Hydraulics is a world leader when it comes to counterbalance valves. It has just completed its 33rd year in service and it is still in operating condition. Sun counterbalance cartridges can be installed directly into a cavity machined in an actuator housing for added protection and improved stiffness in the circuit. Hydra Part. Understanding the key differences between Sun's counterbalance families is the first step in choosing the perfect valve for your system. The result of these features is refined load control and hydraulic dampening. A three-port, atmospherically vented version (CA**) is available for retrofit into three-port cavities where unexpected back pressure has created a problem. CABK 1:1 pilot ratio, vented counterbalance valve - atmospherically referenced 90 CACK 1:1 pilot ratio, vented counterbalance valve - atmospherically referenced 91 CAEK 1:1 pilot ratio, vented counterbalance valve - atmospherically referenced 92 CAGK 1:1 pilot ratio, vented counterbalance valve - … ...which family of counterbalance valves is best for your system? Use the 25 psi (1,7 bar) check unless actuator cavitation is a concern. 61 KB pdf. Sun’s floating cartridge construction and cavity design approach allows products to operate precisely and reliably at higher pressures and flow rates in the most demanding applications. Page 1 of 2. Counterbalance valves are used with cylinders to safely hold suspended loads and deal with over-running loads. A leader in its field, Sun offers products that advance your business while improving the safety and performance of your machinery. 73 KB pdf. The presentation is followed by Q&A with attendees. As the industry leader in counterbalance solutions, Sun Hydraulics offers more than 150 … This allows for lower pilot pressures because the pilot pressure required to open the valve is independent of load-induced pressure. This can cause the valve to become unstable when there is significant or fluctuating back pressure. Use the 25 psi (1,7 bar) check unless actuator cavitation is a concern. Sun defines the setting of a counterbalance valve as the pressure at which it cracks open as a relief valve. When there is no pressure applied to the full piston side of a cylinder (figure 1), the valve will maintain oil in the rod side. Sun four-port counterbalance valves (CW**) add a drain port (port 4) to allow for a connection downstream of restriction. Next. Two check valve cracking pressures are available. View Range Here. The two pilot lines shown act on different surface areas inside the valve. £47.51 exc VAT . 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. The presentation is followed by Q&A with attendees. Counterbalance Valves. To find out more, see our, Hydrostatic Transmission Flushing Circuit, Gauge Port Snubbers / Adaptors / Line Fuses, Use the 25-psi check unless actuator cavitation is a concern, Shorter cartridge extension (-0.78") than adjustable version, Machine lift-lower-lift duty cycle is high, With meter-out directional valves, proportional valves or servo valves, Where a maximum setting of 6000 psi (420 bar) is required (two models: CWCL, CWCG), Stability is critical and refined motion control is necessary, Properly sized low-ratio CB** or CW** valves are unstable, Lower pressure drop is required at higher flows, Minimum load pressures exceed 1000 psi (70 bar), Machine lift-lower-lift duty cycle against gravity is repetitive and regular, Lower consistent pilot pressures required to open the valve regardless of widely varying load pressures. Reverse flow is blocked until pilot pressure is applied at port 3. Our CB** family of counterbalance valves is the industry standard in load-holding applications. A three-port, atmospherically vented version (CA**) is available for retrofit into three-port cavities where unexpected back pressure has created a problem. Operation . Copyright © 2002-2021 Sun Hydraulics LLC, a, We use cookies for our website analytics and to improve our site. Flow Control Valves. Pilot ratios range from as low as 1.5:1 up to 10:1. This family is currently available in Sun’s Series 1 (15-gpm) size with more frame sizes to come in the near future. Maximum pressure capabilities up to 420 bar with flow capacities starting from 15 l / min. Back. Each frame size is available in several pilot ratios and flow gains to meet the operating requirements of a broad range of mobile and industrial hydraulic applications. This new family of patent-pending LoadAdaptive™ counterbalance valves is an evolution of our industry-proven CB** family of valves. CP441-1 Counterbalance Valve Twitter . And like the standard counterbalance valves, these are non-vented valves. The flow rate at "crack" is the point where drops turn to a stream, about 1-2 cubic inches per minute. Sort By: … LoadAdaptive valves are multi pilot-ratio valves that provide stability and efficiency by adapting to operating conditions. Single Counterbalance Valve 1/2" In Line - 100-350Bar. proportion to the stated ratio of the valve, until fully open with free-flow from 1 to 2. Use the 25 psi (1,7 bar) check unless actuator cavitation is a concern. Understand the different types of valve that are available, their function and where they are used. Hydra Part. This mill liner handler was built in 1987 and it is still in service in a gold mine located in Nevada. Sun’s family of vented counterbalance valves is insensitive to back pressure at port 2. Functionally, it is a counterbalance valve that seats as a poppet valve and modulates as a spool valve, offering the best of both worlds. Cylinders with large platens and tooling or hydraulic motors on winch drives are two examples of such actuators. The counterbalance valve is used with suspended and overrunning type loads. the best valve for your application. Settings lower than the standard set pressure may result in lower reseat percentages. With a variety of options to choose from, designers can optimise both efficiency and safety. The MB and MW families are useful in challenging applications when: Sun's patented LoadMatch™ family offers M-valve performance with an energy-saving self-setting control. The control creates a dynamic setting that is lower than the thermal relief setting but is never more than necessary to provide safe, reliable load control. The check section allows free flow from the directional valve (port 2) to the load (port 1), while normally blocking flow from port 1 to port 2. Settings lower than the standard set pressure may result in lower reseat percentages. 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. Sun counterbalance cartridges can be installed directly into a cavity machined in an actuator housing for added protection and improved stiffness in the circuit. Loadadaptive Tech Tip valve at a rate determined by the pilot ratio ): our of... Effective setting of the valve is independent of load-induced pressure at port 2 the maximum expected load-induced pressure be as... Cartridge valve industry counterbalance cartridges can be used with suspended and overrunning type loads dynamically self-adjusts response. 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