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The gate of the gate valve is the gate. The direction of movement of the gate is perpendicular to the direction of the flow. The gate valve can only be fully opened and fully closed and cannot be adjusted or throttled. The direction of gate movement of the gate valve is perpendicular to the direction of the flow. The gate valve can only be fully opened and fully closed, and it cannot be adjusted or throttled. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used mode gate valves form a wedge, and the wedge angle varies with the valve parameters.
There are many different ways of classifying the structure of the gate valve. The main difference is that the structure of the sealing element used is different. According to the structure of the sealing element, the forged steel gate valve often divides the gate valve into several different types. The most common form is Parallel-type gate valve and Che-gate valve; according to the structure of the stem, can be divided into open-minor gate valve and dark-pole gate valve.
The opening valve of the stopvalve (GlobeValve) is a plug-shaped valve flap, and the sealing surface is flat or conical, and the valve flap moves linearly along the centerline of the valve seat. The movement of the valve stem, (common name: dark rod), also has a lifting and rotating rod type. (Common name: bright rod) A shut-off valve is a valve in which a closing member (valve) moves along a valve seat centerline. According to this kind of movement of the valve flap, the change of the valve seat port is in direct proportion to the valve stroke. Because the stem of this type of valve has a relatively short opening and closing stroke, and a very reliable cutting function, because the change of the valve seat port is proportional to the stroke of the valve disc, it is very suitable for regulating the flow rate. Therefore, this type of shut-off shut-off valve is very suitable for cutting or regulating and throttling.
The shutoff valve is a forced seal type valve, so when the valve is closed, pressure must be applied to the valve flap to force the seal surface not to leak. When the medium enters the valve from below the valve flap valve (12 sheets), the resistance to be overcome by the operating force is the friction between the stem and the packing and the thrust generated by the pressure of the medium. The force of closing the valve is greater than the opening of the valve. The force is so large that the diameter of the valve stem is large, otherwise the stem bending failure may occur.
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The difference between gate valve and globe valve
The biggest difference between the gate valve and the shut-off valve is the difference between the valve flap, the sealing surface, and slipping into the structure.