先导式, 减压主级 带集成T-8A控制插孔
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此类阀为带集成先导级控制插孔的常开调节元件。先导级控制插孔可接受任何T-8A插孔的压力控制插装阀。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。先导级控制阀的设定决定了减压口(口1)与外泄口(口3)之间的压力降。
- 所有3口减压阀和减压/溢流阀在尺寸上可互换(如:给定的外形结构尺寸阀拥有相同的流道,相同的插孔)。考虑安装配置时,减压/溢流阀的回油路(口3)最好具有公称流量能力。
- 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。
- 主级的阻尼孔被150微米的不锈钢滤网保护。
- 先导式操作阀在减压与溢流模式间过渡时具有极低的死区。
- 先导式操作阀具有非常平坦的压力/流量特性,良好的稳定性和极低的滞回。
- 口3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)。
- 最大进口压力由偏置弹簧决定。D范围弹簧由2000 psi (140 bar)最大压力降测试,W范围弹簧由5000 psi (350 bar)最大进口压力测试。
- 注意:带-8控制选项,应首先用正确的扭矩安装主级阀。然后用合适的扭矩将T-8A先导级控制阀安装进主级阀中。
- -8控制类型允许通过T-8A插孔将先导级控制阀直接旋进溢流阀的顶部。这些先导级控制阀需单独采购并包括电比例,电磁,气控先导,液控先导操作。请参照先导级控制阀。
- 配置EPDM密封圈的插装阀可用在磷酸酯液压油系统。暴露在石油基液压油或润滑油脂中会损坏密封圈。
- 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。
插孔 | T-19A |
系列 | 4 |
通流能力 | 80 gpm320 L/min. |
最大操作压力 | 5000 psi350 bar |
工厂默认的设定值 | blocked control port (dead headed)blocked control port (dead headed) |
控制先导流量 | 15 - 20 in³/min.0,25 - 0,33 L/min. |
先导控制孔型 | T-8AT-8A |
阀头部安装六角尺寸 | 1 5/8 in.41,3 mm |
阀安装扭矩 | 350 - 375 lbf ft474 - 508 Nm |
型号重量 | 2.90 lb1,30 kg |
Seal kit - Cartridge | Buna: 990019007 |
Seal kit - Cartridge | EPDM: 990019014 |
Seal kit - Cartridge | Polyurethane: 990019002 |
Seal kit - Cartridge | Viton: 990019006 |
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.
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.
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.
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。
There are exactly 250 Sun drops in a cubic inch or 15 in a cc.
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.
- 组合插装阀(先导级和主级)集成块的信息仅供参考。插装阀必须单独订购并在使用时进行装配。
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