电比例 , 直动式, 减压/溢流阀 带开式过渡位 和口4外泄

流量: 5 gpm20 L/min. | 插孔: T-21A
PSDL : 电比例 , 直动式, 减压/溢流阀 带开式过渡位 和口4外泄
技术特性 [ + ]

电比例,直动式溢流型减压阀将进口(口2)高压主油路压力调节减至口1所需的减压压力,同时具备从口1到油箱(口3)的全流量溢流功能。此阀偏置位置为溢流模式。线圈得电使口2与口1接通。增加线圈电流会正比例增大口1减压压力。如果口1压力超出线圈电磁力产生的设定值,口1会向口3溢流。外泄口4使阀对口3压力不敏感。此阀在减压与溢流模式之间的过渡位是打开的。这种过渡位置使阀具备良好的压力控制与动态响应性能。此阀具有可选的全手动控制。

  • 口3处最大压力不能超过3000 psi (210 bar)。
  • 所有弹簧范围都用5000 psi (350 bar)进口压力来测试。
  • 直动式作用的概念在受污染系统中可提供更高的可靠性操作,特别是在闭死情况下。
  • 外泄口(口4)处的压力直接以1:1的比例增加到阀的设定值上,且压力不能超出5000 psi(350 bar)。
  • 技术数据中标定的口3泄漏发生在进口压力为2000 psi (140 bar) 且阀设定在中间范围时。此泄漏直接与压降成正比并与油液粘度成反比。
  • 减压到溢流为微开的过渡位,因此此阀具有良好的压力控制性能,油液的消耗速率为0.1 gpm(0,4 L/分钟。)。
  • 为了达到最佳性能,需要使用带电流传感和可调震颤的放大器。震颤需在100-250 HZ间可调。
  • 从减压压力口(口1)到进口(口2)的反向液流可能导致主阀芯关闭。如果油路中需要反向自由流,可以考虑在油路中加入单向阀。
  • “L和K”手动螺杆调节用途包括:停电期间阀门紧急设置或者选择性地提高阀的设定。
  • 用“L和K”调节螺杆,所有范围出厂设置为零(螺杆完全旋出)。线圈失电,顺时针调节螺杆会增加弹簧偏置力并加到此范围的最大设定上。线圈得电,任何机械压力设定将直接累加到由线圈产生的设定值上。
  • 通过控制外泄口(口4)的压力,阀的有效设定值可以在公称设定值基础上增加。
  • 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。
比例性能数据 [ + ]
注意:技术参数可能因产品配置而不同。请查看产品配置部分。
滞环(在颤振作用下) 6%6%
直流驱动下滞环 <8%<8%
线性度(在颤振作用下) <2%<2%
Repeatability (with dither) <2%<2%
推荐颤振频率 140 Hz140 Hz
技术数据 [ + ]
注意:技术参数可能因产品配置而不同。请查看产品配置部分。
插孔 T-21A
系列 1
通流能力 5 gpm20 L/min.
最大操作压力 5000 psi350 bar
110 SUS (24 cSt)下的最大泄漏 20 in³/min.330 cc/min.
Adjustment - No. of CW Turns from Min. to Max. setting 55
衔铁直径 .75 in.19 mm
阀头部安装六角尺寸 7/8 in.22,2 mm
阀安装扭矩 30 - 35 lbf ft41 - 47 Nm
调节螺栓的内六角尺寸 5/32 in.4 mm
Locknut Hex Size 9/16 in.15 mm
Locknut Torque 80 - 90 lbf in.9 - 10 Nm
型号重量(带线圈) 1.20 lb0,55 kg
Seal and nut kit - Coil Viton: 990770006
Seal kit - Cartridge Buna: 990021007
Seal kit - Cartridge Polyurethane: 990021002
Seal kit - Cartridge Viton: 990021006
性能曲线 [ + ]
常见问题 [ + ]

Our reducing valves are outside-in valves; the supply pressure on the outside of the working parts is higher than the inside. At some pressure differential, the outside (sleeve) will close in on the piston and cause the valve to stick. A D range is adjustable from 25 to 800 psi with a maximum differential of 2000 psi. This means you could set the valve at 600 psi and expect it to work correctly with a supply pressure of 2600 psi. The valve may work at higher differentials, but we do not recommend it. The W and C ranges are tested over their entire range with an inlet pressure of 5000 psi. All direct-acting valves are tested with an inlet pressure of 5000 psi.

No. A reducing/relieving valve throttles a supply of oil to maintain a set pressure in a secondary circuit. The valve is open until the secondary or downstream pressure rises to the setting of the valve at which time it starts to close to limit the pressure. If the secondary or downstream pressure is caused to go above the setting, the valve shifts into relieving mode and throttles the secondary circuit back to tank to prevent over-pressure. At no time can the valve connect the supply to tank.

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.

Yes. A reducing or reducing/relieving valve is normally open. If the pressure in the secondary circuit is less than the setting, it will be open.

2 caveats: (1) If the valve is in the reducing mode and you suddenly reverse the flow, the valve will not have time to open and will shift into relieving mode or (2) If the back flow generates a pressure drop through the valve that exceeds the setting, the valve will shift into the relieving mode.

When in doubt, use a reverse flow check.

设置压力的误差在产品的性能参数页中都有详细说明,您可以通过点击可选产品网页中的更多产品信息到达产品性能参数页面。

Yes. If you look in the sandwich section you will see that we offer many such packages. When you are pressurizing B, A is connected to tank, allowing the reducer to do its job. When you reverse, the drain or tank port of the reducer is pressurized by A. This increases the setting of the reducer and helps keep the reducer open in the reverse flow direction.

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.
备注 [ + ]
  • 当选择Sun阀块时,请检查插装阀的间隙要求。不同的阀控制方式以及线圈要求的间隙不一样。
额外来源 [ + ]
Coil Information [ + ]

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