RBAN | 插装阀 » Electro-Proportional » 溢流阀

此类2口，先导级直动式溢流阀为电比例控制，常闭压力调节阀。此类阀在偏置弹簧力作用下关闭并处于最大压力设定（客户指定）。增加电磁线圈的输入电流会比例地减少阀的压力设定。当口1（进口）压力足够克服弹簧力减去电磁力（大小由输入模拟信号决定），锥阀推开以让液流从口1到口2（出口）流动。这个先导级别溢流阀插孔尺寸为 T-8A，所以它常与SUN的其它主级压力控制阀配合使用。

客户必须在选定压力范围内指定溢流设定值。此设定值代表无输入信号时此阀最大溢流压力。随着信号增加，溢流设定值将减小。请参考选定压力范围内的性能曲线。客户设定值现场不能更改。
改变输入电比例阀的模拟信号从而实现控制压力的无级调节。
此电比例阀利用Sun的T-8A 2口插孔从而可以很好地与Sun主级阀组合使用。只需要加工一个插孔来实现控制级和主级功能，从而消除了单独的先导油路。注意：所有2口的先导级控制阀使用相同的插孔并在外形尺寸上可互换。故只需要考虑功能上的需求。
大的先导通流能力可以实现操作更大尺寸的主级阀。
阻尼结构可使阀在很大操作范围内保持性能稳定。
在关闭位置具有低泄漏性能。（回座发生在开启压力的85%。）
线圈可以和Sun的其它流量电磁阀互换并可从另外一个方向上安装在套筒上。
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。
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。
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。

滞环（在颤振作用下）	<4%<4%
直流驱动下滞环	<8%<8%
线性度（在颤振作用下）	<2%<2%
重复精度(带颤振)	<2%<2%
推荐颤振频率	140 Hz140 Hz

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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-8A
系列	P
通流能力	.25 gpm1 L/min.
最大操作压力	5000 psi350 bar
回座时最大泄漏	1.5 in³/min.25 cc/min.
复位	>85% of setting>85% of setting
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	20 - 25 lbf ft27 - 33 Nm
型号重量（带线圈）	1.00 lb0,45 kg
Seal and nut kit - Coil	Viton: 990770006
Seal kit - Cartridge	Buna: 990208007
Seal kit - Cartridge	Viton: 990208006

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Performance Curve for RBAN: 电比例溢流阀 - 先导流量, 无命令时最高压力设定

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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.

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.

How do I get a kick-down relief to reset?

The kick-down relief acts much like a circuit breaker. When the pressure at the inlet (port 1) of the relief valve rises to the setting, the valve pops open and drops the pressure down to 100 psi or so. The valve stays open until flow through it stops. Shutting off the supply of oil will reset the valve; reversing pressure on the valve is a positive way of resetting it.

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.

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。

How big is a drop of hydraulic oil?

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

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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