先导打开, 弹簧偏置关闭, 非平衡锥阀 逻辑单元 带位置切换
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此类非平衡,锥阀结构逻辑阀为2通开关单元且在弹簧偏置下处于关闭状态。工作口1或者口2压力将使阀关闭而口3的压力会使阀打开。口3产生的作用力必须比口1和口2产生的作用力之和加上弹簧力大,阀才能保持打开状态。注意:先导面积(口3)是口1作用面积的1.8倍且为口2作用面积的 2.25倍。此阀采用位置开关以确认阀可靠关闭。
- 当阀关闭时,此类阀中的位置开关可以提供确认信号。
- 配置EPDM密封圈的插装阀能够用于磷酸酯液压油系统。暴露在石油基液压油或润滑油脂中会损坏密封圈。
- 此类阀在口2与先导口之间有着有效密封。
- 此阀将在出厂前被设定好,现场不可调。任何篡改,将违反产品保修条例。
- 当将此阀安装进入它的插孔时,需要使用乌鸦脚扳手或相似的工具,因为位置指示开关使深套筒扳手失去效用。
- 因为此类阀为非平衡,所以切换取决于压力。锥阀芯的打开和关闭是三个区域的力平衡结果:口1区域=100%,口2区域=80%,和先导口区域=180%
- 此类阀会受所有端口压力影响,因此应考虑一个完整周期内系统各方面的操作情况。任何一个端口压力变化都可能会导致阀从关闭切换到打开位置,反之亦然。一个完整油路中所有可能的压力变化都需要被考虑,以此确保设计的系统安全、可靠。
- 所有端口都可以接受5000 psi (350 bar)的压力。
- 位置开关已通过CE认证。
- 利用Sun浮动结构减少由于过量安装扭矩或插孔/插装阀加工误差带来的内部零件粘结的可能性。
供应电压 | 20-30 VDC20-30 VDC |
运行温度范围 | -25 to 80 °C-25 to 80 °C |
振动 | ≥ 50g, 0-500 impulses/sec≥ 50g, 0-500 impulses/sec |
冲击 | >50 g, 1ms>50 g, 1ms |
反极性保护 | 是是 |
最大输出负载 | ≤ 400 mA, Duty Ratio 100%≤ 400 mA, Duty Ratio 100% |
短路保护 | Yes, Load Short UnlimitedYes, Load Short Unlimited |
及时旋转 | ≤ 25 ms≤ 25 ms |
滞环 | ≤ .002 in.≤ .002 in. |
热量变化 - 0~80 °C ≤ ± | .004 in.0,1 mm |
电磁兼容 | DIN EN 61000-6-1/2/3/4DIN EN 61000-6-1/2/3/4 |
接头 | M12 X 1 (4) PinM12 X 1 (4) Pin |
接头防护等级 | IP65IP65 |
插孔 | T-2A |
系列 | 2 |
通流能力 | 20 gpm80 L/min. |
最大操作压力 | 5000 psi350 bar |
110 SUS (24 cSt)下的最大泄漏 | 1 drops/min.0,07 cc/min. |
.06 in³0,98 cc | |
通向阀的先导流道 | .035 in.0,9 mm |
A3与A1的面积比 | 1.8:11.8:1 |
A3与A2的面积比 | 2.25:12.25:1 |
在110 SUS(24 cSt)下换向过程泄漏 | 2 in³/min.@1000 psi30 cc/min.@70 bar |
阀头部安装六角尺寸 | 1 1/8 in.28,6 mm |
阀安装扭矩 | 45 - 50 lbf ft61 - 68 Nm |
型号重量 | .90 lb0,41 kg |
Seal kit - Cartridge | Buna: 990202007 |
Seal kit - Cartridge | EPDM: 990202014 |
Seal kit - Cartridge | Polyurethane: 990002002 |
Seal kit - Cartridge | Viton: 990202006 |
There are exactly 250 Sun drops in a cubic inch or 15 in a cc.
Direct acting valves are used to prevent over pressure and pilot operated valves are used to regulate pressure. If you are unsure, use a direct acting valve. Sun's direct acting valves are very fast, dirt tolerant, stable, and robust. Sun's pilot operated valves are moderately fast, they have a low pressure rise vs. flow curve, and they are easy to adjust.
Because of the very high ratio, the COFO has limited capacity. The discharge path is across a .050 inch (1,3 mm) diameter orifice. If you have large accumulators combined with low precharge pressures, this may not discharge the energy quickly enough. Using the COFO XDN cartridge in conjunction with an LODA XDN will provide capacity for larger applications.
The LH*A family of valves has been optimized to be used in a package to provide a power source for hydraulic tools. We can quantify the performance of the valve in static conditions but we cannot tell you how it will do in your application.
For instance: You want to use the valve as a compensator for a load-sense power steering package. When you are steering the machine and raising an implement, the valve is in a bypass mode (throttling on the bypass side). When the implement actuator bottoms out, pressure jumps to maximum and now the valve needs to change to the restrictive mode. Since the LH*A is balanced against pressure on the bypass side the only thing moving the spool is its own spring. The time this takes is dependent on where the spool was to begin with and where it has to go.
During this transition the steering will see the pressure differential across it suddenly change from about 150 psi (10 bar) to a system pressure of say 3000 psi (200 bar) and suddenly back down to about 150 psi (10 bar). When this scenario was described to me it was termed the broken thumb syndrome.
Sun does not and cannot provide technical support for this type of application. The valve has been successfully used in similar applications. What is necessary to make it work is up to whoever is doing the application.
The valve was developed originally to power demolition hammers. The hammers are aftermarket accessories that are mounted on a large variety of excavators. The "hammer" circuit provides a method of tapping into the existing hydraulic system of the excavator, turning the tool on and off, controlling flow, and limiting pressure.
Every manufacturer of hammers has very specific needs as far as flow and pressure and there is a large disparity of hydraulic systems in the excavators. For this reason, Sun has never had a catalog package for this circuit.
Sun does not and cannot provide technical support for "hammer valve" installations.
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