The oxygen shut-off valve is a forced-sealed valve, so when the valve is closed, pressure must be applied to the valve flap to force the sealing surface to leak. When the medium enters the valve six under the valve flap of the oxygen shut-off valve, the resistance to be overcome by the operating force is the friction force of the valve stem and the 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. Therefore, the diameter of the valve stem should be large, otherwise the valve stem can be bent. The product features of the oxygen shut-off valve are as follows: (1) The structure is simpler than the gate valve, and it is convenient to manufacture and maintain; (2) The sealing surface is not easy to be worn and scratched, and the sealing property is good. There is no relative sliding between the valve flap and the sealing surface of the valve body when opening and closing, so the wear and the abrasion are not serious, the sealing performance is good, and the service life is long; (3) When opening and closing, the valve flap stroke is small, so the height of the shut-off valve is smaller than that of the gate valve, but the structural length is longer than the gate valve; (4) The opening and closing torque is large, the opening and closing is more laborious, and the opening and closing time is the principal; (5) The fluid resistance is large, because the medium passage in the valve body is tortuous, the fluid resistance is large, and the power consumption is large; (6) When the nominal pressure of the medium flow direction is PN≤16MPa, the downstream flow is generally adopted, and the medium flows upward from the lower side of the valve flap; when the nominal pressure PN≥20MPa, the counterflow is generally adopted, and the medium flows downward from above the valve flap. To increase the sealability. When in use, the shut-off valve medium can only flow in one direction and cannot change the flow direction; (7) The valve flap is often eroded when fully open. The oxygen shut-off valve has the following advantages: 1. Simple structure, convenient manufacturing and maintenance; 2. The working stroke is small and the opening and closing time is short; 3, good sealing, small friction between sealing surfaces, long life. The disadvantages of the oxygen shut-off valve are as follows: 1. The fluid resistance is large, and the force required for opening and closing is large; 2, not suitable for media with particles, high viscosity, easy to coke; 3. The adjustment performance is poor. Hydraulic press four column hydraulic press machine Features Hydraulic Press,Hydraulic Oil Press,Hydraulic Press Machine,Processing Hydraulic Press Rugao Yaou Import & Export Trade Co., Ltd , https://www.ntyaou.com
1.Hydraulic machine that used the hydrostatic pressure to process metal, plastic, rubber, wood, powder and other products .
2. It is commonly used in the pressing process and press forming process, such as: forging, stamping, cold extrusion, straightening, bending, flanging, sheet metal deep drawing, powder metallurgy, press-fit etc.
3.Significant technical and economic advantages in reducing weight, reducing the number of parts and the number of molds, improve the stiffness and strength, reduce production costs, etc.
Product characteristics and advantages and disadvantages of oxygen shut-off valve