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chromium molybdenum steel gate valve characteristics and application

Chrome molybdenum steel gate valve is mainly used in petroleum, chemical, metallurgical, pharmaceutical and other systems. The jacket of the valve is welded between the two flanges of the valve. The side and bottom of the valve are provided with jacket connection ports. The jacket can flow freely through steam or other hot insulation medium to ensure that the viscous medium can flow smoothly through the valve.


Main features and applications of chromium molybdenum steel gate valve:


1. The chromium molybdenum steel gate valve has the advantages of compact structure, reasonable design, good rigidity, smooth channel and small flow resistance coefficient.


2. The sealing surface of chromium molybdenum steel gate valve is made of stainless steel and cemented carbide with long service life.


3. Chromium molybdenum steel gate valve adopts flexible graphite packing, reliable sealing and easy operation.


4. The driving mode of chromium molybdenum steel gate valve is divided into dynamic, electric, pneumatic and gear transmission


5. The structure type of chromium molybdenum steel gate valve: elastic wedge single gate and rigid wedge single gate.


6. Chromium molybdenum steel gate valve is widely used in petrochemical, thermal power plants and other oil and steam pipelines as a device to connect or cut off the medium in the pipeline.


The opening and closing part of chromium molybdenum steel gate valve is the gate. The movement direction of the gate valve is perpendicular to the flow direction. The gate valve can only be fully opened and closed, and can not be adjusted and throttled. Wedge gate valve can be made into a whole, called rigid gate; it can also be made into a small amount of deformation of the gate, in order to improve its process, to make up for the deviation of sealing surface angle in the process of processing. This kind of gate is called elastic gate.

Z41h flange cast steel wedge gate valve.jpg

The opening and closing of chromium molybdenum steel gate valve is controlled by electric device, which is equipped with special motor, reducer, torque control mechanism, field operation mechanism, manual and electric switching mechanism. In addition to local operation, it can also be operated remotely.


When the gate valve is closed, the sealing surface can be sealed only by the medium pressure, that is, the sealing surface of the gate is pressed to the valve seat on the other side to ensure the sealing of the sealing surface, which is self sealing. Most gate valves are forced to seal, that is to rely on external force to force the gate to the valve seat to ensure the sealing of the sealing surface.


When the chromium molybdenum steel gate valve is closed, the sealing surface can be sealed only by the medium pressure, that is, the sealing surface of the gate is pressed to the valve seat on the other side to ensure the sealing of the sealing surface, which is self sealing. Most gate valves are forced to seal, that is to rely on external force to force the gate to the valve seat to ensure the sealing of the sealing surface.


Chromium molybdenum steel gate valve gate valve with the valve stem for linear movement, called the rising stem gate valve, also known as rising stem gate valve. Generally, there are trapezoidal threads on the lifting rod. Through the nut on the top 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 the operating thrust. When the valve is opened, when the lifting height of the gate is equal to 1:1 of the valve diameter, the fluid passage is completely unblocked, but this position cannot be monitored during operation.


In actual use, the top of the valve stem is used as a mark, that is, the position where it can not be opened is taken as its full open position. In order to consider the locking phenomenon of temperature change, the valve is usually turned back 1 / 2-1 circle after opening to the top position as the position of full open valve. Therefore, the full open position of the valve is determined by the position of the gate, that is, the travel distance. In some gate valves, the stem nut is set on the gate, and the hand wheel turns to drive the valve stem to rotate, and the gate is lifted. This kind of valve is called rotary rod gate valve or Non rising stem gate valve.


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