插头阀是最早的阀门之一，具有简单的结构，快速打开和关闭以及低流体阻力。普通的插头阀通过成品金属塞体和阀体之间的直接接触来密封，这是密封不良，大开口和关闭力以及易于磨损的缺点。它们只能在低（不高于1 MPa）和小直径（小于100 mm）中使用。为了扩展插头阀的应用范围，已经开发了许多新结构。油封插头阀是最重要的。从阀体和插头主体之间的插头顶部注入特殊的油脂，以形成油膜，以减少开口和关闭扭矩并改善密封性能和使用寿命。它的工作压力可以达到64 MPa，最高工作温度可以达到325℃，最大直径可以达到600毫米。插头阀的关闭部分是一个带有孔的圆柱体，可围绕垂直于通道的轴旋转，以打开和关闭通道。插头阀的优点：1。易于频繁操作，快速打开和关闭；2.低流体耐药性； 3. Simple structure, relatively small volume, light weight and easy maintenance; 4. Good sealing performance; 5. The installation direction is unrestricted, the flow direction of media can be arbitrary; 6. No vibration and low noise. Classification of plug valves: 1. By structure: tight set plug valve, self-sealing plug valve, pressure balance plug valve and oil seal plug valve; 2. By channel: straight plug valve, three-way plug valve and four-way plug valve. The channel of plug valve has many forms. The common straight through type is mainly used to cut off the fluid; Three-way and four-way plug valve are suitable for fluid reversing.
平板闸阀是closi的滑阀ng part is a parallel gate. The closing part can be a single gate disc or a double gate disc with a supporting mechanism between them. The pressing force of the wedge to the valve seat is controlled by the medium pressure acting on the floating wedge or floating valve seat. If it is a double wedge flat gate valve, the support mechanism between the two wedges can supplement this pressing force. Features of flat gate valve: 1. The valve seat adopts O-ring seal and floating valve seat structure with preload, so that the inlet and outlet of flat gate valve are sealed in both directions. The opening and closing torque is only 1/2 of ordinary valves; 2. When fully open, the channel is smooth and straight, the flow resistance coefficient is very small, there is no pressure loss, simple cleaning; 3. The packing structure with self sealing ability is adopted, the sealing performance is more reliable than ordinary graphite packing. In addition, grease is injected into the sealing surface of the packing, the sealing surface meets the zero leakage standard; 4. When the flat gate valve is closed, it can automatically remove the high pressure in the inner cavity to ensure the safety of use; 5. Fully enclosed structure, good protection performance. Flat gate valve is divided into single gate plate and double gate plate. According to the connection mode, it can be divided into butt welded flat gate valve and flange flat gate valve. Features of butt welded flat gate valve: 1. Small fluid resistance and small scouring and erosion of sealing surface by medium; 2. Opening and closing is labor-saving; 3. The flow direction of the medium is unrestricted, no turbulence and no pressure reduction. 4. Simple shape, short structure length, good manufacturing technology and wide application range. Flange flat gate valve is stable and reliable when used in pipeline, Therefore, DERVOS recommends that flange flat gate valve could be used in high pressure pipeline. Features of flange type flat gate valve: 1. The sealing structure of flange flat gate valve is elastic with preload, and the upstream and downstream sealing seats are sealed at the same time. There is always face-to-face seal between the valve seat and the seal; 2. The valve seat has self-cleaning function and is not directly scoured by the air flow during the opening or closing of the valve. The valve seat is made of lubricated and non abrasive materials; 3. The problem of the valve actuator will not affect other parts of the valve, and the maintenance and replacement can be carried out without removing the valve; 4. When the flange flat gate valve is fully opened, the channel is smooth and straight, the flow resistance coefficient is very small, there is no pressure loss, and the pipeline can be cleaned by wool ball.
在中国2022年是虎年。它将不le's expectations that they could be as brave and strong as tigers and keep working hard. DERVOS Annual meeting of 2021 was held in the second working day after the Spring Festival holiday, which is also Valentine's Day, 14th Feb. In the morning, the heads of all departments made work reports. In the work reports, they reviewed the work achievements of the past year. At the same time, the Department's work objectives and work plans for the new year were formulated. Finally, Eric, our general manager summarized and planed the direction of struggle in 2022.The key word is pragmatic and development. Pragmatic means to work steadily, reduce trial and error costs, and carry out work with practical and feasible schemes. In the meantime, go from complexity to simplicity,result oriented, the final goal is to achieve the development. In the evening, the annual work summary came to an end and the annual dinner officially began. This was not only a good time for different departments to get together, but also an opportunity to win big prizes. DERVOS people work hard and also love life. We are grateful to the support of our business partners over the past year. We will continue to improve and provide partners with the most professional support and meticulous service.
