The counterbalance valve will hold a load in position until pressure or an external force is applied to move the load. This catalog is published by sun hydraulics corporation, 1500 west. Hydraulic counterbalance valve matlab mathworks india. Preferred application for safety and control tasks with double acting consumers. The counterbalance valve block is essentially a datasheetbased model. These valves are hold pressure without leakage and protect against hydraulic line failure. Automatic counter balance systems increase productivity, while reducing wear and energy consumption, by using a ross controls stamping press automatic counterbalance system.
The 4ported counterbalance valve is offered with a wide variety of standard. For additional information see technical tips on pages lm1lm4. New flex series solenoidoperated directional valves. Counterbalance valves introduction they are modulating valves which allow free flow into the actuator and then block the reverse flow until they feel a pilot pressure inversely proportional to the load in the pilot line. They employ a check valve for the free flow direction, a relief. Sun four port counterbalance valves add a drain port port 4 to the cartridge which makes the valve insensitive to back pressure at port 2.
Your order will normally be shipped the same day or within one working day of receiving payment. All world crosses and carries options by daikin, nachi, tokimec eaton vickers, parker taiyo, and more. The proven cb family of valves leverages a proven poppetandpiston design suitable for most general applications and provides precise, reliable load holding and. This unit is a line mounting body fitted with 2 screw in cartridge style. Available in different cartridge types and electrical configurations. Hydraulic counterbalance valve and brake valve hydraulic. Choosing the right counterbalance valve sun hydraulics. Sun opens new manufacturing facility in kunshan, china. The 4ported counterbalance valve is offered with a. This valve does not have positive seals on the pilot section and will pass up to 2 in3min. Download a pdf about the sun counterbalance families.
Use the 25 psi 1,7 bar check unless actuator cavitation is a concern. Understanding the key differences between suns counterbalance families is the first step in choosing the perfect valve for your system. Counterbalance valve operation principle of counterbalance. Counter balance valves hydac counterbalance valves are direct acting poppet valves with integrated check valve which enable a jerkfree movement on the part of consumers in the presence of overcentre loads. Holding position, prevent runaway loads, pneumatic resistor. The variable orifice and check valve blocks simulate the counterbalance valve orifice and check valve.
Aug 14, 2014 the sun hydraulics loadmatch counterbalance valves are selfsetting for maximum convenience. This is a consideration in masterslave circuits and in the leak testing of valvecylinder assemblies. The best position for the valve to be mounted on the cylinder is with the valves adjusting screw pointing down, which allows fast air purging from the pilot line and the spring chamber. An internally piloted counterbalance valve controls cylinder extension smoothly, but reduces thrust during the working portion of the cycle. This guide describes the five families of sun counterbalance valves, their differentiating characteristics and how to choose. B locking of reverse downstream flow when the directional valve is not operated, or the pump is stopped. Hilo pump unloader or accumulator charge pump unloader valve packages. Load control valves are ideally suited for moving and positioning systems. High performance, energy saving and controllability are the main features of walvoils integrated proposals dedicated construction and earth moving machines. Any backpressure at 2 is additive to the pressure setting in all functions. As an example, consider a press with a twoton platen fig. Pilot assist at port 3 lowers the effective setting of the relief valve at a rate determined by the pilot ratio. It is always recommended that a counterbalance valve be set before it is installed in an application.
A guide to suns counterbalance families sun hydraulics. The check valve allows free flow from port 2 to port 1 while a directacting, pilotassisted relief valve controls flow from port 1 to port 2. The sun three port counterbalance cartridges with pilot to open. The counter balance valve will hold a load in position until pressure or an external force is applied to move the load. Counterbalance valve technical information series cb101. As with all industrystandard counterbalance valves, turning the adjusting screw clockwise increases pressure, and turning the screw counterclockwise. Closed centre counter balance valve counterbalance valves from hydraulic megastore weve got a selection of single and double counter balance valves available for next day delivery when purchased direct from our website, all of which come with bsp female ports as standard, however other port options are available. This pressure is applied to the pilot area and assists the differential area in opening the valve. Hydraulic counterbalance valve and brake valve hydraulic valve. Counterbalance valve br can avoid the falling of mechanism due to its weight, and can be used in position occur the back pressure. Sun cavity interchange, sun t2a 35 140350 20005000 79 1146 350 5000 for x42 20 70210 3000 40. Other names for this valve include motion control valve and over center valve. Parkers piloted load control valves are designed to operate. Pressurizing the line leading to the cylinders capend port also applies pilot pressure to the counterbalance valve.
The counterbalance valves spool would then partially close, preventing an uncontrolled drop of the load. Counterbalance and pilottoopen check valves sun hydraulics. Suns loadmatch counterbalance valves incorporate an energysaving selfsetting design. Jun 10, 2014 automatic counter balance systems increase productivity, while reducing wear and energy consumption, by using a ross controls stamping press automatic counterbalance system. All 3port counterbalance, load control, and pilottoopen check cartridges are physically interchangeable i. The relief valve opens when the combined force created by the pilot pressure and the loadinduced pressure. The check valve allows free flow from port 2 to port 1 while a directacting, pilot assisted relief valve controls flow from port 1 to port 2. Features sealed spool type design for improved stability and accuracy as well as low leakage low leakage poppettype check valve for reliable load holding all external parts have yellow zinc dichromate finish.
This is particularly useful in regenerative circuits, meterout circuits, servo valves and proportional valves circuits. Care must be taken if using a conventional relief valve for this application as at some stage of operation the tank port will be subject to maximum circuit pressure. Feb 01, 2016 understanding the key differences between sun s counterbalance families is the first step in choosing the perfect valve for your system. Delivering unmatched quality across a wide range of options, our highvalue hydraulic valve products feature all the characteristics and performance levels of true industry leaders.
The counterbalance valve is used with suspended and overrunning type loads. A utomatically controls setting at reduced loads to minimize energy wasted during machine cycles at less than full load. Sun counterbalance cartridges can be installed directly into a cavity machined in an actuator housing for added protection and improved stiffness in the circuit. Uses include controlling overrunning loads in cylinders and motors. 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. Loadmatch counterbalance valves sun hydraulics corporation. This 3ported, externally piloted unit is a 12size cartridge style, low leakage counterbalance valve with hydraulic vent. These valves provide precise and stable motion control. Models 12 npft 34 npft no manual release b81c00 b121c00 b81c0m b121c0m b81cfm b121cfm manual release flush manual release. A pilot assisted counterbalance valves with coaxial annular check valve and with pilot piston integral with relief plunger.
Troubleshooting the counterbalance valve gpm hydraulic. The single difference is that the brake valve has a remote pilot line in addition to an upstream pilot line. Goto product focused delivery times are available only for the quantities and if applicable, the preferred options listed for the product. Suns loadadaptive counterbalance valve is designed to provide both stability and energy efficiency in a single valve solution. Optional emergency manual release screw available in case pilot pressure is not available to open. Sun s cartridge filters conveniently use the sun cavity to provide last chance and depth style filters. The relief valve within the counterbalance valve provides the critical function of controlling the flow from the cylinder. When there is no pressure applied to the full piston side of a cylinder figure 1. 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. Sep 09, 2014 suns loadmatch counterbalance valves incorporate an energysaving selfsetting design. 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. Reverse flow is blocked until pilot pressure is applied at port 3. If a directional valve not shown in the picture is shifted into position that lowers the load, then the fluid from the rod chamber of the cylinder can exit only if pressure at port p pilot pressure and port l load pressure create enough force to overcome the spring force. Counterbalance, standard poppet type, differential area.
When the directional control is shifted, the platen will fall unless there is a means for creating an opposing hydraulic force. Counter balance valves stimulate smooth control through single direction flow. Sun hydraulics screwin cartridge valves sun hydraulics pressure control cartridge valves sun nonvented counterbalance valves. A counterbalance system in a press helps to compensate for the weight of. When it is counterbalancing the back pressure at t should be kept to a minimum. Counterbalance valve detail about counterbalance valve.
Counterbalance valve, counter balance valves br06 youli. The bad control for back pressure of plastic inject forming machine makes too much loss on pressure. This 3ported, externally piloted counterbalance valve is 8size, cartridge style, low leakage with hydraulic vent. As with the sequence and pressurereducing valves, a check valve is built in to allow free flow in the reverse. Cartridges load holding counterbalance sun hydraulics. As the industry leader in counterbalance solutions, sun hydraulics offers more than 150 standard counterbalance models in a range of capacities, pilot ratios and configurations.
Back pressure may adversely affect the operation of a standard nonvented counterbalance as it directly increases the valve setting, opposing pilot pressure. Closed centre counter balance valve counterbalance valves from hydraulic megastore weve got a selection of single and double counter balance valves available for next day delivery when purchased direct from our website, all of which come with bsp female ports as. The following illustration shows a counterbalance valve schematic. Internally piloted counterbalance valve with cylinder pressing figure 5 shows the maximum force from different types of counterbalance circuits while acting on a part with the cylinder. A hurrying ahead of the pulling consumer is avoided. Counter balance valve comparable replacement to sun. The technical information in this catalog, may contain calculated figures for. This is a consideration in masterslave circuits and in the leak testing of valve cylinder assemblies. Hydraulic counterbalance valve application hydraulic valve. Hydac counterbalance valves are direct acting poppet valves with integrated check valve which enable a jerkfree movement on the part of consumers in the presence of overcentre loads. A separate drain connection from the spring chamber is unnecessary because the pressure section of the valve is inoperative when the t port is pressurized flow is through the check valve. The geometry of these valves in their standard configuration makes them particularly sensitive to backpressure. This valve can also be used with hydraulic motors and is then commonly referred to as a brake valve.
Counterbalance valves sun cavity bosch rexroth usa. Industrial valves eaton industrial valves are easy to install, efficient and long. A counterbalance valve can easily be described as a pilot operated relief valve with a free flow check. Counter balance valves improve the following situation the counterbalance valve on deep pattern type press response late and noise. Order spikes can cause temporary extended lead times. A check valve is incorporated in the circuit in figure 1 to allow freeflow in the reverse direction i. Features sealed spool type design for improved stability and accuracy as well as low leakage low leakage poppettype check valve for reliable load holding. Operates with lower pilot pressure than typical counterbalance valves. Industrial valves eaton industrial valves are easy to install, efficient and longlastingeven in the toughest applications and harshest environments. Incorporates the sun floating style construction to minimize the possibility. Catalog hy153502us contents load and motor control valves. Load and motor control valves parker hannifin corporation hydraulic cartridge systems check valves shuttle valves loadmotor controls flow controls pressure controls.
The counterbalance valve shown has an integral check valve. The sun hydraulics loadmatch counterbalance valves are selfsetting for maximum convenience. The counterbalance valve and brake valve have similar symbols fig. The proven cb family of valves leverages a proven poppetandpiston design suitable for most general applications and provides precise, reliable load holding and motion control at an affordable price. Parker counterbalance valves are screwin type cartridge valves that control the pressure at an actuator controlling its motion. When the cylinder is controlled to move against the counterbalance valve, the pressure rises to overcome the closed condition of the valve and the oil flow path is opened to tank. This webinar originally aired on november 20th, 2015. Counter balance valve comparable replacement to sun hydraulics cbgalin. Turning the adjusting screw clockwise will increase the load carrying capacity of the valve. The counterbalance valve, also called a holding valve, is used to prevent a weight from falling uncontrollably. Care must be taken if using a conventional relief valve for this application as at some stage of operation the tank port will be. As the industry leader in counterbalance solutions, sun hydraulics offers more than 150 standard.