直动式, 减压/溢流 主级 口4导压
此直动式溢流型减压阀主要功能为提供口4小流量压力源与大流量需求油路之间的接口。此类阀将进口(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。此类阀的阻尼结构实现对高的减压力的稳定调节。
- 此阀在100 psi (7 bar)弹簧的偏置作用下处于溢流模式。只要达到门限压力,口4处的压力会直接增加到阀的设定上。例如,口4处的1000 psi (70 bar) 会使口1达到900 psi (63 bar)的设定值。
- 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。
- 适合应用在蓄能器回路中,因为不会出现先导控制流量导致的减压次级回路泄漏。
- 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。
- 直动式版本比相应先导式操作类型具有更好的动态响应。
- 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。
- 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。
- 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。
- 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-22A |
系列 | 2 |
通流能力 | 20 gpm80 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) |
110 SUS (24 cSt)下的最大泄漏 | 3 in³/min.@1000 psi50 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 | .30 lb0,15 kg |
Seal kit - Cartridge | Buna: 990022007 |
Seal kit - Cartridge | EPDM: 990022014 |
Seal kit - Cartridge | Polyurethane: 990022002 |
Seal kit - Cartridge | Viton: 990022006 |
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.
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.
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