how to open globe valve
Stop valve, also known as stop valve, belongs to the forced sealing valve, which is one of the most widely used valves. The reason why the stop valve is popular is that the friction between the sealing surfaces is small during the opening and closing process, which is more durable, the opening height is not large, the manufacturing is easy, and the maintenance is convenient. It is not only suitable for medium and low pressure, but also suitable for high pressure. The closing principle of the stop valve is to make the sealing surface of the valve disc and the sealing surface of the valve seat closely fit and prevent the medium from flowing by relying on the stem pressure.
The opening and closing of the existing stop valve is usually achieved by turning the hand wheel to make the valve disc close to or away from the valve seat slowly. The process of opening and closing the valve disc is extremely slow. Due to the resistance of the fluid medium, it usually takes a lot of effort to turn the hand wheel, and the internal wear of the valve body is large after turning the valve body for a long time, so the tightness of the valve body will be reduced, affecting the service life.
Technical implementation elements:
Based on the above problems, the invention aims to provide a stop valve with long service life, good sealing performance and convenient opening and closing operation.
In view of the above problems, the following technical scheme is provided: a stop valve which can be opened and closed quickly, including a valve body, wherein the valve body is internally provided with a valve seat and a valve disc, and the valve disc is located directly above the valve seat, the upper end of the valve disc is provided with a valve disc cover, the upper end of the valve disc is fixedly connected with a stem, the upper end of the valve body is also welded with a valve cap, and the inner part of the valve cap is provided with an installation cavity, and The inner top wall of the installation chamber is connected with a first sliding block and a second sliding block through sliding, the upper ends of the first sliding block and the second sliding block are both through the valve cover and extend outwards, the inner part of the installation chamber is also connected with a limited plate through sliding, and the surface of the limited plate is provided with a first groove and a second groove;
The first groove is composed of a first trapezoidal groove and an L-shaped groove which are arranged in an inverted way, and the first trapezoidal groove is located on the surface of the limit plate, the second groove is composed of a second trapezoidal groove which is arranged in an inverted way and a rectangular groove which are communicated, and the second trapezoidal groove is located on the surface of the limit plate, the first slide block and the second slide block side walls which are located in the installation cavity are welded with the finite block, and the two The limit block is respectively slidably connected with the first groove and the second groove of the limit plate. The first slide block and the bottom of the second slide block are respectively fixedly connected with the first fixed rod and the second fixed rod. One end of the first fixed rod far away from the first slide block penetrates through the valve cover and extends to the inside of the valve body and is fixedly connected with the upper end of the valve stem, and the bottom of the valve cover is also provided with a valve flap for use Storage tank of;
The inner wall of the installation chamber is also provided with a pressing groove which is used with the second fixed rod. The bottom of the first slide block and the second slide block are fixedly installed with the first spring at the bottom of the installation chamber, and the first spring sleeve is arranged outside the first fixed rod and the second fixed rod. The first fixed block is welded on the limit plate, and the second fixed block is welded on the inner wall of the installation chamber The limiting plate is also provided with a rectangular through hole, the second fixing block is located inside the rectangular through hole and is slidably connected with the rectangular through hole, and the first fixing block and the second fixing block are fixedly connected with a second spring.