DN300 CF8 Manual Gate Valve
Model preparation
Gate valve type representation: Z; Additional codes for gate valves: WZ-represents bellows gate valve, DZ-low temperature gate valve, NKZ-vacuum gate valve, PZ-knife gate valve;
The drive mode indicates: manual without code (usually omitted according to regulations), 2-electro-hydraulic, 3-worm gear, 5-bevel gear transmission, 6-pneumatic, 9-electric;
The connection method indicates: 4-flange connection, 6-welding, 7-wafer type;
Structural form indicates: 0-elastic gate, 1-rising pole wedge single gate, 2-rising pole wedge double gate, 3-rising pole parallel single gate, 4-rising pole parallel double gate, 5-Concealed rod wedge type single gate, 6-Concealed rod wedge type double gate, 7-Concealed rod parallel single gate, 9-Concealed rod parallel double gate;
Sealing material: W-valve body direct processing, T-alloy, X-rubber, F-fluoroplastic, H-Cr stainless steel, Y-tungsten carbide, M-Monel alloy;
Pressure grade indication: PN1.0-32Mpa, 16-1.6MPA indicates pressure of sixteen kilograms, 150LB-1500LB indicates American standard pound pressure, 5-63K indicates daily pressure;
Valve body materials: Z-gray iron, Q-ductile iron, T-alloy, C-carbon steel, P-stainless steel 304, R-stainless steel 316, V-chromium molybdenum
Introduction
The opening and closing part of the gate valve is the gate plate. The movement direction of the gate plate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, but cannot be adjusted or throttled. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used model gate valve form a wedge shape. The wedge angle varies with the valve parameters, usually 50°, and 2°52' when the medium temperature is not high. The gate of the wedge gate valve can be made into a whole, called a rigid gate; it can also be made into a gate that can produce slight deformation to improve its craftsmanship and compensate for the deviation of the sealing surface angle during the processing. This kind of gate The plate is called an resilient gate.
Classification
According to the sealing surface configuration, it can be divided into wedge gate gate valve and parallel gate gate valve. Wedge gate gate valve can be further divided into: single gate type, double gate type and resilient gate type; parallel gate gate valve can be divided into single gate type. Plate type and double gate type. According to the thread position of the valve stem, it can be divided into two types: rising stem gate valve and non rising stem gate valve.
The following matters should be paid attention to when installing and maintaining gate valves: The handwheel, handle and transmission mechanism are not allowed to be used for lifting, and collision is strictly prohibited. Double-gate gate valves should be installed vertically (that is, the valve stem is in a vertical position and the handwheel is at the top). Before opening the gate valve with a bypass valve, the bypass valve should be opened first (to balance the pressure difference between the inlet and outlet and reduce the opening force). Gate valves with transmission mechanisms should be installed according to the product instruction manual. If the valve is frequently used on and off, lubricate it at least once a month.
Advantages
1. Small fluid resistance. The internal mass channel of the valve body is straight, the mass flows in a straight line, and the flow resistance is small.
2. Water hammer is not easy to occur. The reason is the long shutdown time.
3. Simple shape, short structural length and good manufacturing process. Scope of application
4. When fully open, the sealing surface is less eroded by the working mass than that of the stop valve.
5. The body shape is relatively simple and the casting process is good.
Features
Light weight: The body is made of high-grade ductile black cast iron, which is about 20% to 30% lighter than traditional gate valves and is easy to install and maintain.
Flat-bottomed gate seat: Traditional gate valves often have foreign objects such as stones, wood blocks, cement, iron filings, debris, etc. accumulated in the groove at the bottom of the valve after the pipe is washed with water, which can easily lead to leakage due to inability to close tightly. The bottom of the elastic seat seal gate valve adopts the same flat bottom design as the water pipe machine, which is not easy to cause debris accumulation and allows the fluid to flow smoothly.
Overall rubber coating: The gate uses high-quality rubber for the overall inner and outer coating. Europe's first-class rubber vulcanization technology enables the vulcanized gate to ensure precise geometric dimensions, and the rubber and ductile cast gate are firmly connected and are not easy to fall off and Good elastic memory. water
Precision cast valve body: The valve body is precision cast, and the precise geometric dimensions ensure the sealing of the valve without any finishing work inside the valve body.
Product advantages
The fluid resistance is small, and the sealing surface is less brushed and eroded by the medium.
Opening and closing requires less effort.
The flow direction of the medium is not restricted, and there is no flow disturbance or pressure reduction.
It has a simple shape, short structural length, good manufacturing process, and wide application range.
Precautions
The handwheel, handle and transmission mechanism are not allowed to be used for lifting, and collision is strictly prohibited.
Double-gate gate valves should be installed vertically (that is, the valve stem is in a vertical position and the handwheel is at the top).
Before opening the gate valve with a bypass valve, the bypass valve should be opened first (to balance the pressure difference between the inlet and outlet and reduce the opening force).
Gate valves with transmission mechanisms should be installed according to the product instruction manual.
If the valve is frequently used on and off, lubricate it at least once a month.
General requirements
1. The specifications and categories of soft seal gate valves should comply with the requirements of the pipeline design documents.
2. The model of the soft seal gate valve should be indicated with the national standard number requirements. If it is an enterprise standard, the relevant description of the model should be indicated.
3. The working pressure of the soft-sealing gate valve is required to be ≥ the working pressure of the pipeline. Without affecting the price, the working pressure that the valve can withstand should be greater than the actual working pressure of the pipeline. Either side of the soft-sealing gate valve should be able to withstand it when it is closed. 1.1 times the valve working pressure without leakage; when the valve is open, the valve body should be able to withstand twice the valve working pressure.
4. The soft seal gate valve manufacturing standard should indicate the national standard number it is based on. If it is an enterprise standard, the enterprise document should be attached to the purchase contract.
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