The term Gate Valve originated in the words gatan, gap, gasse and gat, and implies a passage using a barrier, which is often hinged on one 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, nevertheless they were well-suited for that requirements from the task.
In the nineteenth century, intensive growth of gate valves moved quickly forward because of their increasing utilization in industrial operations. Over time the types of materials involved in their manufacture were improved and modified to fit different applications.
Gate valves are inclined to the solid wedge or disc getting stuck involving the seats on account of differential contraction involving the valve seats as well as the wedge during shutdown of hot temperature piping system. The piping system should be reheated to the disc to visit smoothly again. This makes the gate valve unsuitable for utilization in piping systems governed by high fluctuations in temperature. However, this issue can be overcome by employing gate valve with flexible wedges.
Solid wedge gate valves are responsive to thermal expansion loads or bending moments which may cause the wedge or disc to lock relating to the valve seats or end in improper seating of wedge between seats and leakage over the valve seats.
Gate valves being metal seated tend not to provide bubble-tight shut-off and really should not be utilised in applications where small leakage over the seats are certainly not permissible.
Structural characteristics of rising-stem gate valve:
The general gate valves officially used on the market for quite a long time generally have water leakage or rust. The company introduces the elastic seat seal gate valve created 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 from the elastic disc to manufacture a small amount of elastic deformation to realize a good sealing effect. The valve contains the obvious attributes of light switch, reliable sealing, good elastic memory and service life. It is usually widely used being a regulating and intercepting device about the pipelines of regular faucet water, sewage, construction, petroleum, chemical industry, food, medicine, textile, electrical power, shipbuilding, metallurgy, energy system, etc.
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