Publish Time: 2023-03-28 Origin: Site
A gate valve can only be fully open and fully closed, which is not suitable for door parameters to vary. It is a valve in the pipeline that is more widely used, mainly to play a role in connecting and cutting off the media. The following is to introduce the working principle of the gate valve.
Here is the content list:
l Classification of gate valves
l Principle of gate valve
1. Manual gate valve working principle: turn the handwheel, through the handwheel and the thread of the stem in and out, lifting or lowering the valve plate connected with the stem, to open and close the roll.
2. According to the classification of shell/body material, gate valves can be divided into metal material valves: such as carbon steel valves, alloy steel valves, stainless steel valves, cast iron valves, etc.
3. Metal body lined valves: such as rubber-lined valves, fluorine-lined valves, lead-lined valves, plastic-lined valves, and enamel-lined valves.
4. Non-metal material valves: such as ceramic valves, glass valves, and plastic valves.
1. The opening and closing member of the gate valve is the gate plate, the direction of movement of the gate is perpendicular to the direction of the fluid, and the gate valve can only be fully open and fully closed, not for regulation and throttling.
2. The gate valve can also be made into a gate that can produce a slight deformation. It improves its workmanship and compensates for deviations in the angle of the sealing surface during machining. This type of gate is called a resilient gate.
3. When the gate valve is closed, the sealing surface can only rely on fluid pressure to seal, which means that fluid pressure must be relied on to press the valve sealing surface to the other side of the seat to seal the sealing surface, which is self-sealing. Most gate valves are forcibly sealed, i.e., when the valve is closed, there is an external force pressing the valve plate against the seat to seal the sealing surface.
4. Gate valves that move linearly around the stem are known as rising stem valves, also called flow valves. The rising stem is usually trapezoidal and the rotary movement is converted into linear movement using a nut on the bonnet and a guide slot in the valve body, that is, the driving torque is converted into driving displacement.
5. In actual use, the top point of the gate valve stem is used as the mark, i.e., the position where it is not moving, as its fully open position. To account for the locking effect of temperature changes, the valve is usually opened to its maximum position and then turned back 1/2 to 1 turn, which corresponds to the fully open valve position. The fully open position of the valve is therefore determined by the movement of the valve plate position.
Wenzhou Luomai ValveTechnology Co.Ltd. is a modern enterprise with R&D, manufacturing, and sales in one. If you are interested in Gate Valve, you can contact us, our website is https://www.luoomaivalve.com/, welcome your arrival and look forward to cooperating with you.