RBAP | 插装阀 » Pressure Control » 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。在选定的压力范围内，比例控制实现了任意的无级调节。当口1（进口）压力足够克服电磁力（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。

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。
在没有模拟输入信号情况下，所有压力等级的设定值降至0。压力范围显示了阀的可行性能区域。
“L”控制（手动重载-调节）允许操作者在停电情况下手动调节阀。“L”控制还可以允许操作者偏置压力范围。例如，如果A范围阀被机械偏置设定到1500 psi (105 bar)，则新的最大设定值将为4500 psi (310 bar)。
这种"E"型的人工控制装置大约有7000次的机械寿命。
阻尼结构可使阀在很大操作范围内保持性能稳定。注意："M"调节方式的型号，衔铁里并没有阻尼结构。
瞬时/旋转重载选项“E”允许操作者顺时针旋转手动重载装置90度以切换阀。
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。
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。
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：当使用M控制时候，压力设定不受限。手动重载上施加的力越大，得到的压力就越高。
大的先导通流能力可以实现操作更大尺寸的主级阀。
可以在高达5000 psi压力下进行操作。
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。
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.
手动紧急操作需要的力	10 lbs/1000 psi @ Port 166 N/100 bar @ Port 1
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	EPDM: 990008014
Seal kit - Cartridge	Viton: 990208006

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Performance Curve for RBAP: 电比例溢流阀 - 先导流量

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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.

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.

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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