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Operating principle and structural characteristics of electric elastic seat-sealed gate valve

by:Sino Valves     2021-03-12
The operating principle of the elastic seat seal electric gate valve: the core components of the electric elastic seat seal gate valve mainly include the valve body, the valve cover, the valve stem and the gate, as shown in Figure 1. The gate is made of nodular cast iron covered with non-toxic rubber (directly vulcanized nitrile rubber or EPDM rubber). The sealing of the entire valve mainly relies on the contact between the rubber gate and the casting. A good sealing effect is achieved through a small amount of elastic deformation of the rubber due to the force. The sealing is reliable, and it can achieve zero leakage, and the friction factor is small, the wear is small, and the valve is opening and closing The moment of time is small, the operation is light, the service life is long, no pollution, corrosion resistance and beautiful appearance. Figure 1 Concealed rod elastic seat seal gate valve 1—gate; 2—valve body; 3—valve stem; 4—seal; 5—hexagon socket screw; 6—bonnet; 7—thrust bearing; 8, 12—O Ring; 9—hand wheel; 10—screw; 11—the structural characteristics of the gland elastic seat seal electric gate valve: 1. Flat-bottomed seat 0  The traditional metal gate valve is often cleaned by water due to foreign objects such as stone and wood. Blocks, cement, iron filings, sundries, etc. are deposited in the groove at the bottom of the valve, which can easily cause the tight opening and closing and cause water leakage. The elastic seat-sealed gate valve adopts a flat-bottom design with no groove at the bottom of the inner cavity, and the bottom is the same as that of the water pipe, which is not easy to cause debris to deposit, and the seal is consistent. 2. The ram is covered with high-quality rubber. The first-class rubber vulcanization technology enables the vulcanized gate to ensure accurate geometric dimensions, and the rubber and ductile iron are firmly attached, not easy to fall off and elastic. Good memory. 3. All parts meet environmental protection requirements. The valve body, bonnet, bracket, handwheel, transmission cap and other parts of the elastic seat gate valve are made of ductile iron. After special treatment, high-pressure electrostatic spraying technology is used to spray the inner and outer surfaces of the ring. Oxygen resin powder coating, the internal parts are made of stainless steel or copper alloy, which effectively prevents the formation of corrosion, and is non-polluting, non-toxic, and has a beautiful surface. 4. Small flow resistance and low head loss. Due to the spraying process, the epoxy resin coating surface is very smooth, which greatly reduces the surface roughness of the channel through which the medium flows, so the flow resistance is small and the head loss is small; At the same time, the bottom of the valve body is designed as a straight-through type, which also reduces flow resistance and head loss. 5. Special shaft seal    Because the valve stem adopts three O-ring seals and a dust-proof ring seal design, it can reduce frictional resistance when switching and greatly reduce water leakage. 6. The protective device    avoids lawsuits and claims caused by the theft of manhole covers and pedestrian injuries. The elastic seat gate valve that can be buried directly in the ground is equipped with a set of protective devices. There is a valve box on the top of the device. The valve box can be opened and closed with an extended socket wrench when the cover on the valve box is opened. It is an underground concealed rod elastic seat seal gate.
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