先导式, 减压/溢流阀 带口4外泄

流量: 10 gpm40 L/min. | 插孔: T-21A
PVDA : 先导式, 减压/溢流阀 带口4外泄
技术特性 [ + ]

先导控制式,带外泄口的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。先导部分的外泄口4使阀对油箱(口3)压力不敏感.可以接入其它先导级控制阀或2通阀实现远程控制

  • 口3处最大压力不能超过3000 psi (210 bar)。
  • 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。
  • 推荐的最大进口压力由调节范围决定。范围D, E, N和Q 是由进口和减压口间最大压力降2000 psi (140 bar)来测试。范围A, B和H是由进口和减压口间最大压力降3000 psi (210 bar)来测试。范围C和W是由进口最大压力5000 psi (350 bar)来测试。
  • 口4处最大压力不能超过5000 psi (350 bar)。
  • 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。
  • 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)。
  • 先导式操作减压,减压/溢流阀先天不是快速动作阀。如需极好的动态响应,可以考虑使用直动式阀。
  • W和Y控制方式(可用时)可以指定或不指定特殊设定值。当没有特殊设定值指定时,W和Y控制方式下可以在全量程范围内调节设定值。当指定为特殊设定值时,此值则代表阀的最大设定值。
  • 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。
  • 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。
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 10 gpm40 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 7 - 10 in³/min.0,11 - 0,16 L/min.
调节 - 从最小设定到最大设定的顺时针圈数 55
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
锁紧螺母六角尺寸 9/16 in.15 mm
锁紧螺母力矩 80 - 90 lbf in.9 - 10 Nm
型号重量 .30 lb0,15 kg
Seal kit - Cartridge Buna: 990021007
Seal kit - Cartridge EPDM: 990021014
Seal kit - Cartridge Polyurethane: 990021002
Seal kit - Cartridge Viton: 990021006
性能曲线 [ + ]
常见问题 [ + ]

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.

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 [ + ]
  • 不同弹簧对应的最大工作压差: A和B为3000 psi (210 bar),D和E为2000 psi (140 bar),W为5000 psi (350 bar)进口压力。
额外来源 [ + ]