2通, 先导切换 换向阀 带口4外泄 - 常关

流量: .5 gpm2 L/min. | 插孔: T-21A
DRAX : 2通, 先导切换 换向阀 带口4外泄 - 常关
技术特性 [ + ]

此常闭,直动式带外部节流孔的2位方向阀为先导级卸荷阀。它用来感知一个油路的压力从而切换或卸荷另一个油路的阀。当口1压力超过阀的设定,阀芯切换以接通口2到口3.

  • 先导口(口1)和弹簧泄油腔(口4)是完全密封的。
  • 2口与3口之间阀芯泄流量少于20滴/分(1.4cc/min)。
  • 这种阀并不是用来调节压力,而是用来进行压力档位选择。
  • Sun浮动式的结构可以最大限度地减少由于过大的安装扭矩以及孔型加工的误差所造成的干涉现象。
技术数据 [ + ]
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 .5 gpm2 L/min.
最大操作压力 5000 psi350 bar
回座时最大泄漏 20 drops/min.20 drops/min.
复位 >85% of setting>85% of setting
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
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
型号重量 .30 lb0,15 kg
Seal kit - Cartridge Buna: 990021007
Seal kit - Cartridge Polyurethane: 990021002
Seal kit - Cartridge Viton: 990021006
性能曲线 [ + ]
常见问题 [ + ]

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

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.

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.

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.

DP**s and DR**s are from the reducer/reliever family and are very capable of modulating. They are not bistable.

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.

额外来源 [ + ]