久久人人97超碰精品888 I 亚洲欧美日韩国产综合 I 99久久精品久久久久久ai换脸 I 白丝美女操出白浆 I 久久久久久欧美 I 日本国产极品诱惑 I 国产精品乱码久久久久久 I 成人综合日日夜夜 I 老司机午夜精品视频在线观看 I 精品亚洲成av人在线观看 I 9i免费看片黄 I 免费成人美女在线观看. I 999av电影 I 国产成人综合亚洲91猫咪 I 激情伦乱视频 I 久久麻豆一区二区 I 青娱乐极品盛宴一区二区 I 欧美精品久久99 I 成人激情视频免费在线 I 另类激情文学 I 国产片av在线免费观看 I 56国语精品自产拍在线观看 I 国产日韩视频在线观看 I 日本高清中文字幕有码在线 I 成人aaaa免费全部观看 I 天堂а√在线8种子蜜桃视频 I 国产成人免费视频 I 欧美美女啪啪 I 国产精品天干天干在观线 I 亚洲精品国产动漫 I 国模一区二区三区私拍视频 I 国产噜噜噜噜久久久久久久久 I 欧美三级乱人伦电影

DH7cs41 Hydraulic Control Check Butterfly Valve produced and sold by Baigang valve group is suitable for the medium of water pump outlet pipeline, as a closed circuit and check valve, used to avoid and reduce the pipeline system intermediate flow back and produce too large water hammer, to protect the pipeline system.The valve is opened by hydraulic drive and closed by heavy hammer potential energy.The valve can replace two valves of gate valve, butterfly valve and check valve after the installation of load pump.The flow resistance coefficient is only 30% of the above two valves.

 　　

Therefore, this kind of valve is energy saving product.When closing, the liquid control device is divided into two stages: fast closing and slow closing: the first 60° is fast closing, and the last 30° is slow closing. According to different working conditions, the fast and slow closing time and the fast and slow concern change angles can be adjusted to prevent the occurrence of large water hammer.The valve also has the function of retaining pressure: the hydraulic system of the butterfly valve is equipped with an accumulator, storing pressure oil, replenishing the leakage of the system, and can automatically compensate the pressure.

At the same time, it has the function of automatic reset. When the valve opening is reduced (the heavy hammer falls) by 15°, the oil pump will start and automatically reset.Backup reset device, after the butterfly valve is opened, when a small amount of internal leakage accumulator is added in the hydraulic system, when the pressure drops to a certain value, the relay will make up for the pressure, the micro pressure relay to prevent the failure of the travel switch reset device, that is, the valve is opened in the position with double position protection function of maintaining pressure and maintaining position.