How to Choose Non-Rising Stem and Rising Stem Gate Valves?
What are the differences between non-rising stem gate valves and rising stem gate valves? How to choose them?
There are some common points between common non-rising stem gate valves and rising stem gate valves as follows.
(1) The gate valve is sealed by the valve seat.
(2) The direction of motion of the gate valve is related to the direction of the fluid.
(3) The vertical gate valve can only be fully opened and closed. It can not be adjusted or throttled.
The rising stem gate valve
The gate valve is also called a rotary rod gate valve (it is also called a wedge gate valve). The nut is set on the top. The rotation of the hand wheel drives the rotation to make the rise. Usually, you have a trapezoid at the bottom. Through the bottom of the valve and the guide groove on the disc, the rotating motion becomes a linear motion. That is, the operating torque becomes the operating thrust.
The gate valve and the rising stem gate valve
1. The rising stem gate valve can be seen. However, the gate valve can not be seen in the valve body.
2. The open gate valve is driven by the steering wheel, so we can drive the lifting. The gate valve drives the lift by turning at the fixed point. When switching, the steering wheel and valve stem are connected and relatively stationary.
3. The drive of the gate valve is located in the valve body. The naked eye can not judge the state of the valve. We can intuitively judge the opening and closing positions outside of the valve body.
4. The gate valve height is small, and the installation space is small. The height of the open gate valve is large and the installation space is large.
5. If the rising stem gate valve is outside the valve body, it is conducive to maintenance and lubrication. If it is in the valve body, it is difficult to maintain and lubricate. It is easy to be eroded by the medium and damages the valve. In the range of use, the rising stem gate valve is more extensive.
The structure of the gate valve and the rising stem gate valve can be divided into:
1. The rising stem gate valve: the nut is on the valve cover or support. When the gate is turned, the nut achieves the lifting. This structure is conducive to lubrication, and the degree is obvious, so it is widely used.
2. The gate valve: the nut is in the valve body, and it directly contacts the medium. The gate is realized by turning. The advantage of this structure is that the height of gate valves is unchanged, so the installation space is small. It is suitable for large diameters or limited installation space for the gate valve. The structure shall be fitted with indicators to indicate degrees. The disadvantage of this structure is that it can not only be lubricated, but also be eroded directly by the medium and easily damaged.
These are the main differences between these two valves. When we choose to use it, we can choose according to our own needs, rather than simply use it directly. Because of the functions of the two valves, they are not completely the same. There are many differences we need to carefully distinguish.
There are some common points between common non-rising stem gate valves and rising stem gate valves as follows.
(1) The gate valve is sealed by the valve seat.
(2) The direction of motion of the gate valve is related to the direction of the fluid.
(3) The vertical gate valve can only be fully opened and closed. It can not be adjusted or throttled.
The rising stem gate valve
The gate valve is also called a rotary rod gate valve (it is also called a wedge gate valve). The nut is set on the top. The rotation of the hand wheel drives the rotation to make the rise. Usually, you have a trapezoid at the bottom. Through the bottom of the valve and the guide groove on the disc, the rotating motion becomes a linear motion. That is, the operating torque becomes the operating thrust.
The gate valve and the rising stem gate valve
1. The rising stem gate valve can be seen. However, the gate valve can not be seen in the valve body.
2. The open gate valve is driven by the steering wheel, so we can drive the lifting. The gate valve drives the lift by turning at the fixed point. When switching, the steering wheel and valve stem are connected and relatively stationary.
3. The drive of the gate valve is located in the valve body. The naked eye can not judge the state of the valve. We can intuitively judge the opening and closing positions outside of the valve body.
4. The gate valve height is small, and the installation space is small. The height of the open gate valve is large and the installation space is large.
5. If the rising stem gate valve is outside the valve body, it is conducive to maintenance and lubrication. If it is in the valve body, it is difficult to maintain and lubricate. It is easy to be eroded by the medium and damages the valve. In the range of use, the rising stem gate valve is more extensive.
The structure of the gate valve and the rising stem gate valve can be divided into:
1. The rising stem gate valve: the nut is on the valve cover or support. When the gate is turned, the nut achieves the lifting. This structure is conducive to lubrication, and the degree is obvious, so it is widely used.
2. The gate valve: the nut is in the valve body, and it directly contacts the medium. The gate is realized by turning. The advantage of this structure is that the height of gate valves is unchanged, so the installation space is small. It is suitable for large diameters or limited installation space for the gate valve. The structure shall be fitted with indicators to indicate degrees. The disadvantage of this structure is that it can not only be lubricated, but also be eroded directly by the medium and easily damaged.
These are the main differences between these two valves. When we choose to use it, we can choose according to our own needs, rather than simply use it directly. Because of the functions of the two valves, they are not completely the same. There are many differences we need to carefully distinguish.
