Knowledge of soft seal gate valve

Oct 12,2021

The soft seal gate valve is also called the lifting stem gate valve (also called the rising stem gate valve). Usually there is a trapezoidal thread on the lifting rod, through the nut of the valve and the guide groove on the valve body, the rotary motion is changed into linear motion, that is, the operating torque is changed into operating thrust. When the valve is opened, when the lift height of the gate is equal to 1:1 times the valve diameter, the fluid channel, but during operation, this position cannot be monitored. In actual use, the apex of the valve stem is used as the mark, that is, the unmovable position, as its fully open position. In order to take into account the lock-up phenomenon caused by temperature changes, it is usually opened to the top position, and then rewind 1/2-1 circle, as the position of the fully open valve. Therefore, the fully open position of the valve is determined by the position of the gate (i.e. stroke>. This type of valve should generally be installed horizontally in the pipeline.
Soft seal gate valve features:
light weight: the body is made of ductile iron, which is more weight than traditional gate valves The weight is reduced by about 20%-30%, and the installation and maintenance are convenient.
Flat-bottomed valve seat: The traditional gate valve often deposits in the bottom recess of the valve due to foreign objects such as stones, wood, cement, iron filings, and other debris after the pipe is washed with water. In the tank, it is easy to cause water leakage due to the inability to close tightly. The bottom of the elastic seated gate valve adopts the same flat-bottom design as the water pipe, which is not easy to cause debris and make the fluid unimpeded.
Overall encapsulation: The rubber used in the valve is integrated in and out. , European-flow rubber vulcanization technology enables the vulcanized valve to maintain the geometric dimensions, and the rubber and ductile iron valves are firmly connected, not easy to fall off, and have good elasticity.
Precision casting valve body: The valve body is made of casting, and the geometric dimensions are The valve can be sealed without any fine processing inside the valve body.
Embedded copper nut: The copper nut and the elastic valve adopt embedded joint, so that the two are tightly combined into one body, and there is no looseness or damage caused by vibration caused by water flow. .
: The valve body is coated with powder epoxy resin, which can prevent corrosion and rust of the valve body, and can be used in sewage systems.
Not easy to break: In the past, traditional cast iron gate valves were often hit by foreign objects, collisions or heavy pressure. Causes cracks, etc. Since the body is changed to ductile iron, this situation can be greatly reduced.
Triple "O" ring seal: Because the valve stem is sealed with a triple "O" seal, it can reduce the frictional resistance when closing, greatly reduce water leakage and can replace the seal without stopping the water.

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