rvet | 插装阀 » Pressure Control » 溢流阀

外接口控制，先导控制式软启动溢流阀不仅限制最大系统压力而且可以起到限制压力上升速度的作用。此类阀打开后以恒定速度关闭，这和阀的设定与流量大小无关。此类3口阀在主级活塞和先导级之间提供了一个外接口（口3），可以接入其它先导级控制阀或2通阀实现远程控制。调节螺杆决定了最大设定（溢流）和最小设定（门限压力）。

因为调节发生在阀的内部，所以这些阀不会出现与气蚀相关的问题，即噪音和阀块腐蚀。
可在口2接受最大压力；适合应用在交叉端口的溢流油路中。
口3（外接口）处的远程先导溢流阀可以控制此阀压力低于设定值。
不适合使用在负载锁紧应用中。
当进口（口1）压力超过门限设定时，阀打开到油箱（口2）。先导部分以稳定速率向前移动，压缩先导弹簧并增加设定值。当先导部分到达机械限位时，阀达到最大设定值。
此阀可减少由突然换向引起的冲击，为静压驱动装置提供保护。此阀适合交叉端口溢流应用。
当与换向装置一起使用时，此阀可提供比例阀具有的斜坡特性。
可用软溢流阀启动小泵站，从而提高泵的寿命。
油箱口（口2）处的背压直接以1:1的比例增加到阀的设定值上。
主级的阻尼孔被保护以防止污染。
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。

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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-2A
系列	2
通流能力	30 gpm120 L/min.
最大操作压力	5000 psi350 bar
工厂默认的设定值	4 gpm15 L/min.
控制先导流量	10 - 25 in³/min.0,16 - 0,41 L/min.
压力上升时间	200 - 400 ms200 - 400 ms
额定响应时间	2 ms2 ms
调节 - 从最小设定到最大设定的顺时针圈数	4.54.5
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
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
美国专利号#	6,039,0706,039,070
Seal kit - Cartridge	Buna: 990402007
Seal kit - Cartridge	Polyurethane: 990002002
Seal kit - Cartridge	Viton: 990402006

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Performance Curve for RVET: 防冲击, 外接口控制, 先导式, 平衡锥阀溢流阀

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Direct acting, pilot operated, what do I use?

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.

SUN压力控制阀在设置压力时的误差是多少？

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。

Where would I use a kick-down relief?

One graphic example is on a portable grain auger for silos. When the farmer gets caught in the auger the kick-down relief trips and allows him to escape.

How big is a drop of hydraulic oil?

There are exactly 250 Sun drops in a cubic inch or 15 in a cc.

Can I use a kick-down relief for my system relief?

Maybe not. We build in a good amount of overlap in the kick-down reliefs to prevent false tripping. This means they are not as fast as our standard pilot operated reliefs. A direct-acting relief valve set just above the kick-down relief valve would be good insurance.

What parts of the Sun cartridge valve are field serviceable?

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.

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