The opening and closing part of the inlet shut-off valve is a plug-shaped valve flap, and the sealing surface is a plane or a cone surface, and the valve flap moves linearly along the centerline of the fluid. Imported cut-off valve, flanged shut-off valve, butt-welding cut-off valve, socket weld-sealed globe valve, vented guide valve. Inlet shutoff valve Cutoff valve structure diagram Cutoff valve standard Cutoff valve details Cut-off valve type Cut-off valve for / Application Cut-off valve size Cut-off valve price list Shut-off valve working principle Cut-off valve installation diagram Cut-off valve specification Cut-off valve internal structure drawing Body material: cast iron, cast steel, stainless steel, forged steel, chromium molybdenum steel, chromium molybdenum vanadium steel, brass, sealing surface material: H, N, F46, J, Y, W, T, G. Working pressure 1.6-32MPA, operating temperature -40 °C - 550 °C. Valve diameter DN15-DN1000. Connection method: flange, welding, internal thread, external thread, and card sleeve. Transmission: manual, spur gears, bevel gears, pneumatic, electric. Applicable medium: water, oil, gas, steam, acids. The valve stem moves in the form of a lift rod (the stem moves up and down, the handwheel does not move up and down), and there is also a lift rotary lever type (the handwheel rotates and lifts together with the valve stem and the nut is located on the valve body). Shut-off valves are only suitable for full opening and full closing and do not allow adjustments and throttling. The shutoff valve is a forced seal type valve, so when the valve is closed, pressure must be applied to the valve flap to force the seal surface not to leak. When the medium enters the valve from below the valve flap, the resistance to be overcome by the operating force is the friction force of the stem and packing and the thrust generated by the pressure of the medium. The force of closing the valve is greater than the force of opening the valve, so the valve The diameter of the rod must be large, otherwise a failure of the stem bending may occur. In recent years, after the emergence of the self-sealing valve, the medium flow of the stop valve has been changed from above the valve flap into the valve chamber. At this time, under the pressure of the medium, the force to close the valve is small, and the force to open the valve is large. The diameter can be reduced accordingly. At the same time, this type of valve is also tighter under the influence of the medium. China's valve "three to give" has stipulated that the flow direction of the globe valve shall be adopted from top to bottom. When the stop valve is opened, the opening height of the valve flap is 25% to 30% of the nominal diameter, and the flow rate has reached the maximum, indicating that the valve has reached the fully open position. Therefore, the fully open position of the stop valve should be determined by the stroke of the disc. The inlet cut-off valve has the following advantages: 1. The structure is simple, manufacturing and maintenance are more convenient. 2. The work schedule is small and the opening and closing time is short. 3. Good sealing performance, low friction between sealing surfaces, and long life. The disadvantages of the shut-off valve are as follows: 1. The fluid resistance is large, and the force required when opening and closing is large. 2. Not suitable for media with particles, high viscosity, and easy to coke. 3. The adjustment performance is poor. The structure of the stop valve: 1. The type of stop valve is divided into external thread type and internal thread type according to the position of the stem thread. According to the flow direction of the media, there are straight-through, direct-flow, and angled. The shut-off valve is divided according to the form of the seal. There are packing seal cut-off valve and bellows sealed shut-off valve. 2. The valve body has straight-through, direct-flow, and right-angle configurations. Straight through is the most common structure, but its fluid resistance is greatest. The DC type fluid has small resistance, and it is mostly used for fluids containing solid particles or with high viscosity. The right-angle valve body is mostly forged and is suitable for smaller pass-by valves and higher pressure shut-off valves. The following items should be paid attention to the installation and maintenance of the cut-off valve: 1. The cut-off valve operated by the handwheel and handle can be installed at any position of the pipeline. 2. Handwheels, handles and vigor mechanisms shall not be used for hoisting. 3, the direction of flow of the medium should be consistent with the direction of the arrow shown in the valve body. Furniture Sofa And Mattress Staple Zhejiang Best Nail Industrial Co., Ltd. , https://www.beststaple.com