先导关闭, spring-biased closed, 非平衡锥阀 逻辑单元 带 位置切换

流量: 50 gpm200 L/min. | 插孔: T-2A
LOFCZ : 先导关闭, spring-biased closed, 非平衡锥阀  逻辑单元  带 位置切换
技术特性 [ + ]


  • 当阀关闭时,此类阀中的位置开关可以提供确认信号。
  • 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。
  • 一个带安装硬件的可选防护罩可被单独订购。参见工具箱编号:991-043。
  • 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。
切换说明 [ + ]
供应电压 20-30 VDC20-30 VDC
运行温度范围 -25 to 80 °C-25 to 80 °C
Vibration ≥ 50g, 0-500 impulses/sec≥ 50g, 0-500 impulses/sec
冲击 >50 g, 1ms>50 g, 1ms
Reverse Polarity Protection
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
EMC 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
技术数据 [ + ]
插孔 T-2A
系列 2
通流能力 50 gpm200 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.
Pilot Volume Displacement .07 in³1,1 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
Seal kit - Cartridge Buna: 990202007
Seal kit - Cartridge Polyurethane: 990002002
Seal kit - Cartridge Viton: 990202006
性能曲线 [ + ]
常见问题 [ + ]

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.

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.

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.

FAQ hammer valve schematic

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.

Only external seals are serviceable.  Sun offers replacement seal kits for all cartridge models. The applicable kit part number can be found in the product page's Technical Data table or by using our Cartridge Seal Kit search function located under Accessories. Please note: Converting the external seals from one material to another does not ensure fluid compatibility with that material due to the existence of internal seals within the cartridge.

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.

额外来源 [ + ]