The term Gate Valve descends from the words gatan, gap, gasse and gat, and implies a passage that has a barrier, which is often hinged on the other hand, allowing it to be OPENED and CLOSED.Some on the first known gate valves were chosen by the Egyptians, Greeks, and Romans when irrigating fields with water find more. These were simple wooden barriers, however they were well-suited for your requirements from the task.
In the 1800s, intensive continuing development of gate valves moved quickly forward because of their increasing used in industrial operations. Over time the types of materials involved in their manufacture were improved and modified to fit different applications.
Gate valves are given to the solid wedge or disc getting stuck between seats as a result of differential contraction between valve seats along with the wedge during shutdown of warm piping system. The piping system ought to be reheated for that disc traveling smoothly again. This makes the gate valve unsuitable for easy use in piping systems be subject to high fluctuations in temperature. However, this matter can be overcome through the use of gate valve with flexible wedges.
Solid wedge gate valves are responsive to thermal expansion loads or bending moments which often can cause the wedge or disc to lock between valve seats or bring about improper seating of wedge between seats and leakage along the valve seats.
Gate valves being metal seated don't provide bubble-tight shut-off and must not be found in applications where small leakage through the seats are certainly not permissible.
Structural characteristics of rising-stem gate valve:
The general gate valves suited for the market for quite a while generally have water leakage or rust. The company introduces the elastic seat seal gate valve made by European high-tech rubber and valve manufacturing technology, which overcomes the defects of poor sealing and rust of general gate valves gate valve. The sealing gate valve uses the compensation effect with the elastic disc to generate a small amount of elastic deformation to attain a good sealing effect. The valve gets the obvious features of light switch, reliable sealing, good elastic memory and service life. It might be widely used as being a regulating and intercepting device for the pipelines of regular water, sewage, construction, petroleum, chemical industry, food, medicine, textile, electrical power, shipbuilding, metallurgy, energy system, etc.
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