由呼和浩特铁路局科研所研制的双阀式自回水客车上水阀,是专供旅客列车上水的新型阀门,它是在以前研制的HK型自回水客车上水阀(为单阀式)的基础上发展研制的新型上水阀。双阀式上水阀在一个阀体内有左右2个水室,装有2套阀芯,控制着左右2个送水管上水。双阀式上水阀既是2个单阀式的组合,但又不是简单的结合,为了减少双阀体积和重量,便于安装而对原单阀体做了较大的设计上的改进。该阀的结构性能具有以下优点: (1)一体双阀,提高了上水能力。由于可同时向2个车箱上水,也可单管上水,互不影响,大大提高 Hohhot Railway Bureau by the research institute developed double-valve self-backwater passenger car valve, is designed for passenger trains on the water of a new type of valve, which is developed in the past, HK self-return water bus passenger valve ) Based on the development and development of new Sheung Shui valve. Double valve on the valve in a valve body has about 2 water chamber, equipped with 2 sets of spool, control about 2 water pipes on the water. The double-valve pop-up valve is a combination of two single-valve type, but not a simple combination, in order to reduce the dual valve size and weight, easy to install the original single valve body made a larger design improvements. The structural performance of the valve has the following advantages: (1) integrated double valve, improve the water capacity. As the water can be simultaneously to the 2 car, but also a single tube on the water, without affecting each other, greatly increased