Advantage
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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.
4. The structure of the DIN Globe Valve body is straight-through, direct-flow and right-angle. Straight-through is the most common structure, but its fluid resistance is greatest. DC fluid resistance is small, and it is mostly used for fluids containing solid particles or high viscosity. The right angle valve body is mostly forged, suitable for small through, high pressure shut-off valves.
Disadvantage
1. The fluid resistance is large, and the force required for opening and closing is large.
2. It is not suitable for media with particles, high viscosity and easy coking.
3. The adjustment performance is poor.
4. The type of the Bronze Globe 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 medium, there are straight-through, direct-current and angular. The shut-off valve is divided into seals, with a packing seal shut-off valve and a bellows seal shut-off valve.
5. The bellows seal stop valve adopts the design of the bellows seal, completely eliminating the shortcomings of the normal valve stem packing seal aging and easy to leak, not only improving the energy efficiency, increasing the safety of the production equipment, reducing the maintenance cost and frequent Maintenance and maintenance also provides a clean and safe working environment.
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The gate valve is an opening and closing gate. The movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate valve is sealed through the contact between the valve seat and the gate plate. Usually, the sealing surface will be surfacing with metal materials to increase wear resistance, such as surfacing 1Cr13, STL6, stainless steel, etc. The gate has a rigid gate and an elastic gate. According to the different gates, the gate valve is divided into a hard-sealed gate valve and an elastic gate valve.
Advantages and disadvantages of gate valves
The medium channel inside the valve body is straight, the medium flows in a straight line, and the flow resistance is small.
Compared with the globe valve, because whether it is open or closed, the direction of movement of the gate is perpendicular to the flow direction of the medium.
The opening and closing stroke of the gate is large, and the lowering is carried out by the screw.
The phenomenon of water hammer is not easy to occur. The reason is the long closing time.
The medium can flow in any direction on both sides, which is easy to install. The gate valve channel is symmetrical on both sides.
The length of the structure (the distance between the two connecting end faces of the shell) is small.
The shape is simple, the length of the structure is short, the manufacturing process is good, and the scope of application is wide.
The structure is compact, the valve rigidity is good, the channel is smooth, the flow resistance is small, the sealing surface is made of stainless steel and hard alloy, the service life is long, and the PTFE packing is used. The sealing is reliable, and the operation is light and flexible.
It is easy to cause erosion and scratches between the sealing surfaces, and maintenance is more difficult. The external size is large, a certain space is required to open, and the opening and closing time is long. The structure is more complicated.
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