HVCA8 | 插装阀 » Pressure Control » 溢流阀

在单向阀前的溢流阀是一种复合型阀，此阀在单向阀功能前并入了一个常闭，平衡滑阀结构溢流阀。此阀具有一个集成先导控制插孔。先导级控制插孔可接受任何T-8A插孔的压力控制插装阀。当进口（口2）压力达到先导级控制阀的设定，阀开始向油箱（口3）溢流，节流以调节压力。T-8A先导单元通过口4泄油。单向阀流量为进口（口2）到系统口（口1）。

注意！该阀偏离正常的溢流阀流道，不能与Sun现存的溢流阀阀块一起工作。
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。
主级的阻尼孔被保护以防止污染。
此阀的单向阀功能部分最大泄漏速率不超过1滴/分钟（0,07 cc/min）。
此双功能阀一方面可以在单个或多泵油路中提供泵隔离和溢流保护作用。另外此阀可以在蓄能器感应，泵卸荷油路中作为主级阀使用。
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。
-8控制类型允许通过T-8A插孔将先导级控制阀直接旋进溢流阀的顶部。这些先导级控制阀需单独采购并包括电比例，电磁，气控先导，液控先导操作。请参照先导级控制阀。
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-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	4 gpm15 L/min.
110 SUS (24 cSt)下的最大泄漏	2 in³/min.@1000 psi30 cc/min.@70 bar
单向开启压力	25 psi1,7 bar
先导控制孔型	T-8AT-8A
先导控制阀安装扭矩	20 - 25 lbf ft27 - 33 Nm
额定响应时间	10 ms10 ms
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
Seal kit - Cartridge	Buna: 990021007
Seal kit - Cartridge	EPDM: 990021014
Seal kit - Cartridge	Polyurethane: 990021002
Seal kit - Cartridge	Viton: 990021006

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Performance Curve for HVCA8: 外接口控制, 先导式, 平衡滑阀溢流主级带集成T-8A控制插孔 - 在单向阀前

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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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