daal | 插装阀 » Directional » 2-通

此类2位2通电磁阀为直动式，平衡滑阀结构先导级阀且常用来作其他大流量阀的先导级。此阀有常开与常闭两种配置。此阀可以直接安装进SUN的先导控制或外接口控制阀的插孔中，用来提供集成先导控制。

DAAL型号阀集成了和现行的系列1阀一样的线圈，接头和手动重载操作选项。DAAL与DAAA相比，除了外部线圈尺寸不一样和需要更高的线圈电压外，其它都可相互替换。
电磁铁组件的疲劳耐压等级为5000 psi (350 bar)。
此阀可被直接驱动且不需要最小液压操作压力。
此阀有几种不同的手动紧急操作选项，包括无手动紧急操作。见以下可选选项。请注意：风雨线圈不兼容手动紧急操作功能。
此阀可被直接安装进Sun先导控制和外接口控制阀中以提供电磁先导控制功能。单独的先导油路被去除，只需要加工一个插孔来整合先导控制级和主级的功能。
阀表现出极低的泄漏速率；小于10滴/分钟。@5000 psi（0,7 cc/min @ 350 bar）。
注意：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。
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。
带D或L控制的型号，手动重载中的止动机构是用来作临时驱动用途。
此阀采用湿式衔铁线圈设计。这意味着衔铁周围的工作流体介质将曝露在线圈所产生热场中。如果线圈长时间通电，这将是一个影响因素。一些液体，特别是水/乙二醇混合物，会在长时间高温下分解并形成凡立水，而这将会影响阀的功能。
线圈可以和Sun的系列1电磁阀产品互换并可从另外一个方向上安装在套筒上。
线圈接头等级可提供至IP69K。请见单个线圈产品的详细产品说明。额外的风雨线圈和工具包可提供更完善的环境防护。
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。

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
110 SUS (24 cSt)下的最大泄漏	10 drops/min.@5000 psi0,7 cc/min.@350 bar
手动紧急操作需要的力	5 lbs/1000 psi @ Port 133 N/100 bar @ Port 1
手动紧急操作动作行程	.10 in.2,5 mm
额定响应时间	50 ms50 ms
切换频率	15,000 max. cycles/hr15,000 max. cycles/hr
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: 990008007
Seal kit - Cartridge	EPDM: 990008014
Seal kit - Cartridge	Polyurethane: 990008002
Seal kit - Cartridge	Viton: 990008006

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Performance Curve for DAAL: 2通, 电磁滑阀换向阀 - 先导流量

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How big is a drop of hydraulic oil?

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

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.

Where would I use a DR__ instead of a DP__?

In many circuits the directional cartridge is set to shift at a low pressure no matter how high the pilot pressure goes. If you use a DP__ , the pilot flow increases to significant amounts. A DR__ however will only consume a small amount of flow. A DP__ is useful when you want to block or open the pilot flow to shift the valve.

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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