Zhejiang Sifang Valve Co., Ltd.; [Slab Gate Valve] [Metallurgical Non-standard Valve] [Sewage Treatment Valve] [Ball Valve]
The disadvantages of the slab gate valve are as follows:
1. Erosion and abrasion are easily caused between the sealing surfaces, and maintenance is difficult.
2. The external dimensions are large, and a certain space is required for opening, and the opening and closing time is long.
3. The structure is more complicated.
Gate valve installation and maintenance 1, handwheel, handle and transmission mechanism are not allowed to be used for lifting, and collision is strictly prohibited.
2. The double gate valve should be installed vertically (ie the stem is in the vertical position and the handwheel is on the top).
3. The gate valve with the bypass valve should open the bypass valve before opening (to balance the pressure difference between the inlet and outlet and reduce the opening force).
4. The gate valve with transmission mechanism is installed according to the specifications of the product manual.
5. If the valve is used frequently, it should be lubricated at least once a month.
6. The gate valve is used as the cut-off medium. When it is fully open, the whole flow is straight through. At this time, the pressure loss of the medium operation is small.
7. The gate valve is generally suitable for working conditions that do not require frequent opening and closing, but also keep the ram fully open or fully closed.
8. The gate valve is not suitable for use as an adjustment or throttling. For high-speed flowing media, the gate can cause vibration of the gate under partial opening conditions, and the vibration may damage the sealing surface of the gate and the valve seat, and the throttling will cause the ram to be eroded by the medium.
The advantages of the slab gate valve are as follows:
1. The flow resistance is small. The inner medium passage of the valve body is straight through, the medium flows in a straight line, and the flow resistance is small.
2. It is more labor-saving when opening and closing. Compared with the shut-off valve, the direction of movement of the shutter is perpendicular to the direction of flow of the medium, whether it is open or closed.
3, high height, long opening and closing time. The opening and closing stroke of the shutter is large, and the drop is performed by the screw.
4. The water hammer phenomenon is not easy to produce. The reason is that the shutdown time is long.
5. The medium can flow in any direction on both sides, which is easy to install. The gate valve channels are symmetrical on both sides.
6. The length of the structure (the distance between the two connecting end faces of the casing) is small.
7. The sealing surface is easy to wear and affect the service life. When opening and closing, the two sealing surfaces of the gate and the valve seat rub against each other, and it is easy to cause abrasion and abrasion under the action of the medium pressure, which affects the sealing performance and shortens the service life.
8, the price is more expensive. There are many contact sealing surfaces, and the processing is complicated. In particular, the sealing surface on the gate seat is not easy to process, and there are many parts. The utility model has the advantages of simple shape, short structure length, good manufacturing process and wide application range.
Zhejiang Sifang Valve Main; slab gate valve, gas slab gate valve, flange slab gate valve, welded slab gate valve, clamp slab gate valve
The disadvantages of the slab gate valve are as follows:
1. Erosion and abrasion are easily caused between the sealing surfaces, and maintenance is difficult.
2. The external dimensions are large, and a certain space is required for opening, and the opening and closing time is long.
3. The structure is more complicated.
Gate valve installation and maintenance 1, handwheel, handle and transmission mechanism are not allowed to be used for lifting, and collision is strictly prohibited.
2. The double gate valve should be installed vertically (ie the stem is in the vertical position and the handwheel is on the top).
3. The gate valve with the bypass valve should open the bypass valve before opening (to balance the pressure difference between the inlet and outlet and reduce the opening force).
4. The gate valve with transmission mechanism is installed according to the specifications of the product manual.
5. If the valve is used frequently, it should be lubricated at least once a month.
6. The gate valve is used as the cut-off medium. When it is fully open, the whole flow is straight through. At this time, the pressure loss of the medium operation is small.
7. The gate valve is generally suitable for working conditions that do not require frequent opening and closing, but also keep the ram fully open or fully closed.
8. The gate valve is not suitable for use as an adjustment or throttling. For high-speed flowing media, the gate can cause vibration of the gate under partial opening conditions, and the vibration may damage the sealing surface of the gate and the valve seat, and the throttling will cause the ram to be eroded by the medium.
The advantages of the slab gate valve are as follows:
1. The flow resistance is small. The inner medium passage of the valve body is straight through, the medium flows in a straight line, and the flow resistance is small.
2. It is more labor-saving when opening and closing. Compared with the shut-off valve, the direction of movement of the shutter is perpendicular to the direction of flow of the medium, whether it is open or closed.
3, high height, long opening and closing time. The opening and closing stroke of the shutter is large, and the drop is performed by the screw.
4. The water hammer phenomenon is not easy to produce. The reason is that the shutdown time is long.
5. The medium can flow in any direction on both sides, which is easy to install. The gate valve channels are symmetrical on both sides.
6. The length of the structure (the distance between the two connecting end faces of the casing) is small.
7. The sealing surface is easy to wear and affect the service life. When opening and closing, the two sealing surfaces of the gate and the valve seat rub against each other, and it is easy to cause abrasion and abrasion under the action of the medium pressure, which affects the sealing performance and shortens the service life.
8, the price is more expensive. There are many contact sealing surfaces, and the processing is complicated. In particular, the sealing surface on the gate seat is not easy to process, and there are many parts. The utility model has the advantages of simple shape, short structure length, good manufacturing process and wide application range.
Zhejiang Sifang Valve Main; slab gate valve, gas slab gate valve, flange slab gate valve, welded slab gate valve, clamp slab gate valve
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